Download:
pdf |
pdf§ 74.18
30 CFR Ch. I (7–1–19 Edition)
(b) If a change is proposed in a pump
unit of a certified CMDPSU or in electrical components of a CPDM, the approval of MSHA with respect to intrinsic safety shall be obtained in accordance with the procedures set forth in
§ 74.11(d).
§ 74.18 Withdrawal of certification.
Any certificate of approval issued
under this part may be revoked for
cause by NIOSH or MSHA which issued
the certificate.
PART 75—MANDATORY SAFETY
STANDARDS—UNDERGROUND
COAL MINES
Subpart A—General
Sec.
75.1 Scope.
75.2 Definitions.
Subpart B—Qualified and Certified Persons
75.100 Certified person.
75.150 Tests for methane and for oxygen deficiency; qualified person.
75.151 Tests for methane; qualified person;
additional requirement.
75.152 Tests of air flow; qualified person.
75.153 Electrical work; qualified person.
75.154 Repair of energized surface high voltage lines; qualified person.
75.155 Qualified hoisting engineer; qualifications.
75.156 AMS operator, qualifications.
75.159 Records of certified and qualified persons.
75.160 Training programs.
75.161 Plans for training programs.
kpayne on VMOFRWIN702 with $$_JOB
Subpart C—Roof Support
75.200 Scope.
75.201 Definitions.
75.202 Protection from falls of roof, face and
ribs.
75.203 Mining methods.
75.204 Roof bolting.
75.205 Installation of roof support using
mining machines with integral roof bolters.
75.206 Conventional roof support.
75.207 Pillar recovery.
75.208 Warning devices.
75.209 Automated Temporary Roof Support
(ATRS) systems.
75.210 Manual installation of temporary
support.
75.211 Roof testing and scaling.
75.212 Rehabilitation of areas with unsupported roof.
75.213 Roof support removal.
75.214 Supplemental
support
materials,
equipment and tools.
75.215 Longwall mining systems.
75.220 Roof control plan.
75.221 Roof control plan information.
75.222 Roof control plan—approval criteria.
75.223 Evaluation and revision of roof control plan.
Subpart D—Ventilation
75.300 Scope.
75.301 Definitions.
75.302 Main mine fans.
75.310 Installation of main mine fans.
75.311 Main mine fan operation.
75.312 Main mine fan examinations and
records.
75.313 Main mine fan stoppage with persons
underground.
75.320 Air quality detectors and measurement devices.
75.321 Air quality.
75.322 Harmful quantities of noxious gases.
75.323 Actions for excessive methane.
75.324 Intentional changes in the ventilation system.
75.325 Air quantity.
75.326 Mean entry air velocity.
75.327 Air courses and trolley haulage systems.
75.330 Face ventilation control devices.
75.331 Auxiliary fans and tubing.
75.332 Working sections and working places.
75.333 Ventilation controls.
75.334 Worked-out areas and areas where
pillars are being recovered.
75.335 Seal strengths, design applications,
and installation.
75.336 Sampling and monitoring requirements.
75.337 Construction and repair of seals.
75.338 Training.
75.339 Seals records.
75.340 Underground electrical installations.
75.341 Direct-fired intake air heaters.
75.342 Methane monitors.
75.343 Underground shops.
75.344 Compressors.
75.350 Belt air course ventilation.
75.351 Atmospheric monitoring systems.
75.352 Actions in response to AMS malfunction, alert, or alarm signals.
75.360 Preshift examination at fixed intervals.
75.361 Supplemental examination.
75.362 On-shift examination.
75.363 Hazardous conditions and violations
of mandatory health or safety standards;
posting, correcting, and recording.
75.364 Weekly examination.
75.370 Mine ventilation plan; submission
and approval.
75.371 Mine ventilation plan; contents.
75.372 Mine ventilation map.
75.373 Reopening mines.
75.380 Escapeways; bituminous and lignite
mines.
496
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00506
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
75.381 Escapeways; anthracite mines.
75.382 Mechanical escape facilities.
75.384 Longwall and shortwall travelways.
75.385 Opening new mines.
75.386 Final mining of pillars.
75.388 Boreholes in advance of mining.
75.389 Mining into inaccessible areas.
Subpart E—Combustible Materials and
Rock Dusting
75.400 Accumulation of combustible materials.
75.400–1 Definitions.
75.400–2 Cleanup program.
75.401 Abatement of dust; water or water
with a wetting agent.
75.401–1 Excessive amounts of dust.
75.402 Rock dusting.
75.402–1 Definition.
75.402–2 Exceptions.
75.403 Maintenance of incombustible content of rock dust.
75.403–1 Incombustible content.
75.404 Exemption of anthracite mines.
kpayne on VMOFRWIN702 with $$_JOB
Subpart F—Electrical Equipment—General
75.500 Permissible electric equipment.
75.500–1 Other low horsepower electric face
equipment.
75.501 Permissible electric face equipment;
coal seams above water table.
75.501–1 Coal seams above the water table.
75.501–2 Permissible electric face equipment.
75.501–3 New openings; mines above water
table and never classed gassy.
75.502 Permits for noncompliance.
75.503 Permissible electric face equipment;
maintenance.
75.503–1 Statement listing all electric face
equipment.
75.504 Permissibility of new, replacement,
used, reconditioned, additional, and rebuilt electric face equipment.
75.505 Mines classed gassy; use and maintenance of permissible electric face equipment.
75.506 Electric face equipment; requirements for permissibility.
75.506–1 Electric face equipment; permissible condition; maintenance requirements.
75.507 Power connection points.
75.507–1 Electric equipment other than
power-connection points; outby the last
open crosscut; return air; permissibility
requirements.
75.508 Map of electrical system.
75.508–1 Mine tracks.
75.508–2 Changes in electric system map; recording.
75.509 Electric power circuit and electric
equipment; deenergization.
75.510 Energized trolley wires; repair.
75.510–1 Repair of energized trolley wires;
training.
Pt. 75
75.511 Low-, medium-, or high-voltage distribution circuits and equipment; repair.
75.511–1 Qualified person.
75.512 Electric equipment; examination,
testing and maintenance.
75.512–1 Qualified person.
75.512–2 Frequency of examinations.
75.513 Electric conductor; capacity and insulation.
75.513–1 Electric conductor; size.
75.514 Electrical connections or splices;
suitability.
75.515 Cable fittings; suitability.
75.516 Power wires; support.
75.516–1 Installed insulators.
75.516–2 Communication wires and cables;
installation; insulation; support.
75.517 Power wires and cables; insulation
and protection.
75.517–1 Power wires and cables; insulation
and protection.
75.517–2 Plans for insulation of existing bare
power wires and cables.
75.518 Electric equipment and circuits; overload and short circuit protection.
75.518–1 Electric equipment and circuits;
overload and short circuit protection;
minimum requirements.
75.518–2 Incandescent lamps; overload and
short circuit protection.
75.519 Main power circuits; disconnecting
switches.
75.519–1 Main power circuits; disconnecting
switches; locations.
75.520 Electric equipment; switches.
75.521 Lightning arresters; ungrounded and
exposed power conductors and telephone
wires.
75.522 Lighting devices.
75.522–1 Incandescent
and
fluorescent
lamps.
75.523 Electric
face
equipment;
deenergization.
75.523–1 Deenergization
of
self-propelled
electric face equipment installation requirements.
75.523–2 Deenergization
of
self-propelled
electric face equipment; performance requirements.
75.523–3 Automatic
emergency-parking
brakes.
75.524 Electric face equipment; electric
equipment used in return air outby the
last open crosscut; maximum level of alternating or direct electric current between frames of equipment.
APPENDIX A TO SUBPART F OF PART 75—LIST
OF PERMISSABLE ELECTRIC FARE EQUIPMENT APPROVED BY THE BUREAU OF MINES
PRIOR TO MAY 23, 1936
Subpart G—Trailing Cables
75.600 Trailing cables; flame resistance.
75.600–1 Approved cables; flame resistance.
75.601 Short circuit protection of trailing
cables.
497
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00507
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Pt. 75
30 CFR Ch. I (7–1–19 Edition)
75.601–1 Short circuit protection; ratings
and settings of circuit breakers.
75.601–2 Short circuit protection; use of
fuses; approval by the Secretary.
75.601–3 Short circuit protection; dual element fuses; current ratings; maximum
values.
75.602 Trailing cable junctions.
75.603 Temporary splice of trailing cable.
75.604 Permanent splicing of trailing cables.
75.605 Clamping of trailing cables to equipment.
75.606 Protection of trailing cables.
75.607 Breaking trailing cable and power
cable connections.
75.705–5 Installation of protective equipment.
75.705–6 Protective clothing; use and inspection.
75.705–7 Protective equipment; inspection.
75.705–8 Protective equipment; testing and
storage.
75.705–9 Operating disconnecting or cutout
switches.
75.705–10 Tying into energized high-voltage
surface circuits.
75.705–11 Use of grounded messenger wires;
ungrounded systems.
75.706 Deenergized underground power circuits; idle days—idle shifts.
Subpart H—Grounding
Subpart I—Underground High-Voltage
Distribution
75.700 Grounding metallic sheaths, armors
and conduits enclosing power conductors.
75.700–1 Approved methods of grounding.
75.701 Grounding metallic frames, casings
and other enclosures of electric equipment.
75.701–1 Approved methods of grounding of
equipment
receiving
power
from
ungrounded alternating current power
systems.
75.701–2 Approved method of grounding metallic frames, casings and other enclosures receiving power from single-phase
110–220-volt circuit.
75.701–3 Approved methods of grounding metallic frames, casings and other enclosures of electric equipment receiving
power from direct current power systems
with one polarity grounded.
75.701–4 Grounding wires; capacity of wires.
75.701–5 Use of grounding connectors.
75.702 Protection other than grounding.
75.702–1 Protection other than grounding;
approved by an authorized representative
of the Secretary.
75.703 Grounding offtrack direct-current
machines and enclosures of related detached components.
75.703–1 Approved method of grounding.
75.703–2 Approved grounding mediums.
75.703–3 Approved methods of grounding offtrack mobile, portable and stationary direct-current machines.
75.703–4 Other methods of protecting offtrack direct-current equipment; approved by an authorized representative
of the Secretary.
75.704 Grounding frames of stationary highvoltage equipment receiving power from
ungrounded delta systems.
75.704–1 Approved methods of grounding.
75.705 Work on high-voltage lines; deenergizing and grounding.
75.705–1 Work on high-voltage lines.
75.705–2 Repairs to energized surface highvoltage lines.
75.705–3 Work on energized high-voltage surface lines; reporting.
75.705–4 Simultaneous repairs.
75.800 High-voltage circuits; circuit breakers.
75.800–1 Circuit breakers; location.
75.800–2 Approved circuit schemes.
75.800–3 Testing, examination and maintenance of circuit breakers; procedures.
75.800–4 Testing, examination, and maintenance of circuit breakers; record.
75.801 Grounding resistors.
75.802 Protection of high-voltage circuits
extending underground.
75.803 Fail safe ground check circuits on
high-voltage resistance grounded systems.
75.803–1 Maximum voltage ground check circuits.
75.803–2 Ground check systems not employing pilot check wires; approval by the
Secretary.
75.804 Underground high-voltage cables.
75.805 Couplers.
75.806 Connection of single-phase loads.
75.807 Installation of high-voltage transmission cables.
75.808 Disconnecting devices.
75.809 Identification of circuit breakers and
disconnecting switches.
75.810 High-voltage trailing cables; splices.
75.811 High-voltage underground equipment;
grounding.
75.812 Movement of high-voltage power centers and portable transformers; permit.
75.812–1 Qualified person.
75.812–2 High-voltage power centers and
transformers; record of examination.
HIGH-VOLTAGE LONGWALLS
75.813 High-voltage longwalls; scope.
75.814 Electrical protection.
75.815 Disconnect devices.
75.816 Guarding of cables.
75.817 Cable handling and support systems.
75.818 Use of insulated cable handling equipment.
75.819 Motor-starter enclosures; barriers
and interlocks.
75.820 Electrical work; troubleshooting and
testing.
498
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00508
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
Pt. 75
75.821 Testing, examination and maintenance.
75.822 Underground high-voltage longwall
cables.
75.823 Scope.
75.824 Electrical protection.
75.825 Power centers.
75.826 High-voltage trailing cables.
75.827 Guarding of trailing cables.
75.828 Trailing cable pulling.
75.829 Tramming continuous mining machines in and out of the mine and from
section to section.
75.830 Splicing and repair of trailing cables.
75.831 Electrical work; troubleshooting and
testing.
75.832 Frequency of examinations; recordkeeping.
75.833 Handling high-voltage trailing cables.
75.834 Training.
APPENDIX A TO SUBPART I OF PART 75—DIAGRAMS OF INBY AND OUTBY SWITCHING
75.1003 Insulation of trolley wires, trolley
feeder wires and bare signal wires; guarding of trolley wires and trolley feeder
wires.
75.1003–1 Other requirements for guarding of
trolley wires and trolley feeder wires.
75.1003–2 Requirements for movement of offtrack mining equipment in areas of active workings where energized trolley
wires or trolley feeder wires are present;
pre-movement requirements; certified
and qualified persons.
Subpart J—Underground Low- and Medium-Voltage Alternating Current Circuits
75.900 Low- and medium-voltage circuits
serving three-phase alternating current
equipment; circuit breakers.
75.900–1 Circuit breakers; location.
75.900–2 Approved circuit schemes.
75.900–3 Testing, examination and maintenance of circuit breakers; procedures.
75.900–4 Testing, examination and maintenance of circuit breakers; record.
75.901 Protection of low- and medium-voltage three-phase circuits used underground.
75.902 Low- and medium-voltage ground
check monitor circuits.
75.902–1 Maximum voltage ground check circuits.
75.902–2 Approved ground check systems not
employing pilot check wires.
75.902–4 Attachment of ground conductors
and ground check wires to equipment
frames; use of separate connections.
75.903 Disconnecting devices.
75.904 Identification of circuit breakers.
75.905 Connection of single-phase loads.
75.906 Trailing cables for mobile equipment,
ground wires and ground check wires.
75.907 Design of trailing cables for mediumvoltage circuits.
APPENDIX A TO SUBPART J OF PART 75
kpayne on VMOFRWIN702 with $$_JOB
Subpart K—Trolley Wires and Trolley Feeder
Wires
75.1000 Cutout switches.
75.1001 Overcurrent protection.
75.1001–1 Devices for overcurrent protection;
testing and calibration requirements;
records.
75.1002 Installation of electric equipment
and conductors; permissibility.
Subpart L—Fire Protection
75.1100 Requirements.
75.1100–1 Type and quality of firefighting
equipment.
75.1100–2 Quantity and location of firefighting equipment.
75.1100–3 Condition and examination of firefighting equipment.
75.1101 Deluge-type water sprays, foam generators; main and secondary belt-conveyor drives.
75.1101–1 Deluge-type water spray systems.
75.1101–2 Installation of deluge-type sprays.
75.1101–3 Water requirements.
75.1101–4 Branch lines.
75.1101–5 Installation of foam generator systems.
75.1101–6 Water sprinkler systems; general.
75.1101–7 Installation of water sprinkler systems; requirements.
75.1101–8 Water sprinkler systems; arrangement of sprinklers.
75.1101–9 Back-up water system.
75.1101–10 Water sprinkler systems; fire
warning devices at belt drives.
75.1101–11 Inspection of water sprinkler systems.
75.1101–12 Equivalent dry-pipe system.
75.1101–13 Dry powder chemical systems;
general.
75.1101–14 Installation of dry powder chemical systems.
75.1101–15 Construction of dry powder chemical systems.
75.1101–16 Dry powder chemical systems;
sensing and fire suppression devices.
75.1101–17 Sealing of dry powder chemical
systems.
75.1101–18 Dry powder requirements.
75.1101–19 Nozzles; flow rate and direction.
75.1101–20 Safeguards for dry powder chemical systems.
75.1101–21 Back-up water system.
75.1101–22 Inspection of dry powder chemical
systems.
75.1102 Slippage and sequence switches.
75.1103 Automatic fire warning devices.
75.1103–1 Automatic fire sensors.
75.1103–2 Automatic fire sensors; approved
components; installation requirements.
75.1103–3 Automatic fire sensor and warning
device systems; minimum requirements;
general.
499
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00509
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Pt. 75
30 CFR Ch. I (7–1–19 Edition)
75.1103–4 Automatic fire sensor and warning
device systems; installation; minimum
requirements.
75.1103–5 Automatic fire warning devices;
actions and response.
75.1103–6 Automatic fire sensors; actuation
of fire suppression systems.
75.1103–7 Electrical components; permissibility requirements.
75.1103–8 Automatic fire sensor and warning
device systems; examination and test requirements.
75.1103–9 Minimum requirements; fire suppression materials and location; maintenance of entries and crosscuts; access
doors; communications; fire crews: highexpansion foam devices.
75.1103–10 Fire suppression systems; additional requirements.
75.1103–11 Tests of fire hydrants and fire
hose; record of tests.
75.1104 Underground storage, lubricating oil
and grease.
75.1106 Welding, cutting, or soldering with
arc or flame underground.
75.1106–1 Test for methane.
TRANSPORTATION, HANDLING AND STORAGE OF
LIQUEFIED AND NONLIQUEFIED COMPRESSED
GAS CYLINDERS
75.1106–2 Transportation of liquefied and
nonliquefied compressed gas cylinders;
requirements.
75.1106–3 Storage of liquefied and nonliquefied compressed gas cylinders; requirements.
75.1106–4 Use of liquefied and nonliquefied
compressed gas cylinders; general requirements.
75.1106–5 Maintenance and tests of liquefied
and nonliquefied compressed gas cylinders; accessories and equipment; requirements.
75.1106–6 Exemption of small low pressure
gas cylinders containing nonflammable
or nonexplosive gas mixtures.
kpayne on VMOFRWIN702 with $$_JOB
FIRE SUPPRESSION DEVICES AND FIRE-RESISTANT HYDRAULIC FLUIDS ON UNDERGROUND
EQUIPMENT
75.1107 Fire suppression devices.
75.1107–1 Fire-resistant hydraulic fluids and
fire suppression devices on underground
equipment.
75.1107–2 Approved fire-resistant hydraulic
fluids; minimum requirements.
75.1107–3 Fire suppression devices; approved
components; installation requirements.
75.1107–4 Automatic fire sensors and manual
actuators; installation; minimum requirements.
75.1107–5 Electrical components of fire suppression devices; permissibility requirements.
75.1107–6 Capacity of fire suppression devices; location and direction of nozzles.
75.1107–7 Water spray devices; capacity;
water supply; minimum requirements.
75.1107–8 Fire
suppression
devices;
extinguishant supply systems.
75.1107–9 Dry chemical devices; capacity;
minimum requirements.
75.1107–10 High expansion foam devices;
minimum capacity.
75.1107–11 Extinguishing agents; requirements on mining equipment employed in
low coal.
75.1107–12 Inerting of mine atmosphere prohibited.
75.1107–13 Approval of other fire suppression
devices.
75.1107–14 Guards and handrails; requirements where fire suppression devices are
employed.
75.1107–15 Fire suppression devices; hazards;
training of miners.
75.1107–16 Inspection of fire suppression devices.
75.1107–17 Incorporation by reference; availability of publications.
75.1108 Approved conveyor belts.
Subpart M—Maps
75.1200 Mine map.
75.1200–1 Additional information on mine
map.
75.1200–2 Accuracy and scale of mine maps.
75.1201 Certification.
75.1202 Temporary notations, revisions, and
supplements.
75.1202–1 Temporary notations, revisions,
and supplements.
75.1203 Availability of mine map.
75.1204 Mine closure; filing of map with Secretary.
75.1204–1 Places to give notice and file
maps.
Subpart N—Explosives and Blasting
75.1300 Definitions.
75.1301 Qualified person.
75.1310 Explosives and blasting equipment.
75.1311 Transporting explosives and detonators.
75.1312 Explosives and detonators in underground magazines.
75.1313 Explosives and detonators outside of
magazines.
75.1314 Sheathed explosive units.
75.1315 Boreholes for explosives.
75.1316 Preparation before blasting.
75.1317 Primer cartridges.
75.1318 Loading boreholes.
75.1319 Weight of explosives permitted in
boreholes in bituminous and lignite
mines.
75.1320 Multiple-shot blasting.
75.1321 Permit for firing more than 20
boreholes and to use nonpermissible
blasting units.
75.1322 Stemming boreholes.
500
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00510
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
75.1323
75.1324
75.1325
75.1326
75.1327
75.1328
and
Blasting circuits.
Methane concentration and tests.
Firing procedure.
Examination after blasting.
Misfires.
Damaged or deteriorated explosives
detonators.
Subpart O—Hoisting and Mantrips
75.1400 Hoisting equipment; general.
75.1400–1 Hoists; brakes, capability.
75.1400–2 Hoists; tests of safety catches;
records.
75.1400–3 Daily examination of hoisting
equipment.
75.1400–4 Certifications and records of daily
examinations.
75.1401 Hoists; rated capacities; indicators.
75.1401–1 Hoists; indicators.
75.1402 Communication between shaft stations and hoist room.
75.1402–1 Communication between shaft stations and hoist room.
75.1402–2 Tests of signaling systems.
75.1403 Other safeguards.
75.1403–1 General criteria.
75.1403–2 Criteria—Hoists transporting materials; brakes.
75.1403–3 Criteria—Drum clutch; cage construction.
75.1403–4 Criteria—Automatic elevators.
75.1403–5 Criteria—Belt conveyors.
75.1403–6 Criteria—Self-propelled personnel
carriers.
75.1403–7 Criteria—Mantrips.
75.1403–8 Criteria—Track haulage roads.
75.1403–9 Criteria—Shelter holes.
75.1403–10 Criteria—Haulage; general.
75.1403–11 Criteria—Entrances to shafts and
slopes.
75.1404 Automatic brakes; speed reduction
gear.
75.1404–1 Braking system.
75.1405 Automatic couplers.
75.1405–1 Automatic
couplers,
haulage
equipment.
WIRE ROPES
75.1429 Guide ropes.
75.1430 Wire ropes; scope.
75.1431 Minimum rope strength.
75.1432 Initial measurement.
75.1433 Examinations.
75.1434 Retirement criteria.
75.1435 Load end attachments.
75.1436 Drum end attachment.
75.1437 End attachment retermination.
75.1438 End attachment replacement.
kpayne on VMOFRWIN702 with $$_JOB
Subpart P—Mine Emergencies
75.1500 [Reserved]
75.1501 Emergency evacuations.
75.1502 Mine emergency evacuation and firefighting program of instruction.
75.1503 Use of fire suppression equipment.
Pt. 75
75.1504 Mine emergency evacuation training
and drills.
75.1505 Escapeway maps.
75.1506 Refuge alternatives.
75.1507 Emergency Response Plan; refuge alternatives.
75.1508 Training and records for examination, maintenance and repair of refuge
alternatives and components.
Subpart Q—Communications
75.1600 Communications.
75.1600–1 Communication facilities; main
portals; installation requirements.
75.1600–2 Communication facilities; working
sections; installation and maintenance
requirements; audible or visual alarms.
75.1600–3 Communications facilities; refuge
alternatives.
Subpart R—Miscellaneous
75.1700 Oil and gas wells.
75.1702 Smoking; prohibition.
75.1702–1 Smoking programs.
75.1703 Portable electric lamps.
75.1703–1 Permissible lamps.
75.1707–1 New working section.
75.1708 Surface structures, fireproofing.
75.1708–1 Surface structures; fireproof construction.
75.1709 Accumulations of methane and coal
dust on surface coal-handling facilities.
75.1710 Canopies or cabs; diesel-powered and
electric face equipment.
75.1710–1 Canopies or cabs; self-propelled
diesel-powered and electric face equipment; installation requirements.
75.1711 Sealing of mines.
75.1711–1 Sealing of shaft openings.
75.1711–2 Sealing of slope or drift openings.
75.1711–3 Openings of active mines.
75.1712 Bath houses and toilet facilities.
75.1712–1 Availability of surface bathing facilities; change rooms; and sanitary facilities.
75.1712–2 Location of surface facilities.
75.1712–3 Minimum requirements of surface
bathing facilities, change rooms, and
sanitary toilet facilities.
75.1712–4 Waiver of surface facilities requirements.
75.1712–5 Application for waiver of surface
facilities.
75.1712–6 Underground sanitary facilities;
installation and maintenance.
75.1712–7 Underground sanitary facilities;
waiver of requirements.
75.1712–8 Application for waiver of location
requirements for underground sanitary
facilities.
75.1712–9 Issuance of waivers.
75.1712–10 Underground sanitary facilities;
maintenance.
75.1713 Emergency medical assistance; firstaid.
501
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00511
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1
30 CFR Ch. I (7–1–19 Edition)
75.1713–1 Arrangements for emergency medical assistance and transportation for injured persons; agreements; reporting requirements; posting requirements.
75.1713–2 Emergency communications; requirements.
75.1713–3 First-Aid training; supervisory
employees.
75.1713–4 First-aid training program; availability of instruction to all miners.
75.1713–5 First-aid training program; retraining of supervisory employees; availability to all miners.
75.1713–6 First-aid training program; minimum requirements.
75.1713–7 First-aid
equipment;
location;
minimum requirements.
75.1714 Availability of approved self-rescue
devices; instruction in use and location.
75.1714–1 Approved self-rescue devices.
75.1714–2 Self-rescue devices; use and location requirements.
75.1714–3 Self-rescue devices; inspection,
testing, maintenance, repair, and recordkeeping.
75.1714–4 Additional self-contained self-rescuers (SCSRs).
75.1714–5 Map locations of self-contained
self-rescuers (SCSR).
75.1714–6 Emergency tethers.
75.1714–7 Multi-gas detectors.
75.1714–8 Reporting SCSR inventory and
malfunctions; retention of SCSRs.
75.1715 Identification check system.
75.1716 Operations under water.
75.1716–1 Operations under water; notification by operator.
75.1716–2 Permit required.
75.1716–3 Applications for permits.
75.1716–4 Issuance of permits.
75.1717 Exemptions.
75.1718 Drinking water.
75.1718–1 Drinking water; quality.
75.1719 Illumination; purpose and scope of
§§ 75.1719 through 75.1719–4; time for compliance.
75.1719–1 Illumination in working places.
75.1719–2 Lighting fixtures; requirements.
75.1719–3 Methods of measurement; light
measuring instruments.
75.1719–4 Mining machines, cap lamps; requirements.
75.1720 Protective clothing; requirements.
75.1720–1 Distinctively colored hard hats, or
hard caps; identification for newly employed, inexperienced miners.
75.1721 Opening of new underground coal
mines, or reopening and reactivating of
abandoned or deactivated coal mines; notification by the operator; requirements.
75.1722 Mechanical equipment guards.
75.1723 Stationary grinding machines; protective devices.
75.1724 Hand-held power tools; safety devices.
75.1725 Machinery and equipment; operation
and maintenance.
75.1726 Performing work from a raised position; safeguards.
75.1727 Drive belts.
75.1728 Power-driven pulleys.
75.1729 Welding operations.
75.1730 Compressed air; general; compressed
air systems.
75.1731 Maintenance of belt conveyors and
belt conveyor entries.
75.1732 Proximity detection systems.
Subpart S [Reserved]
Subpart T—Diesel-Powered Equipment
75.1900 Definitions.
75.1901 Diesel fuel requirements.
75.1902 Underground diesel fuel storage—
general requirements.
75.1903 Underground diesel fuel storage facilities and areas; construction and safety precautions.
75.1904 Underground diesel fuel tanks and
safety cans.
75.1905 Dispensing of diesel fuel.
75.1905–1 Diesel fuel piping systems.
75.1906 Transport of diesel fuel.
75.1907 Diesel-powered equipment intended
for use in underground coal mines.
75.1908 Nonpermissible
diesel-powered
equipment; categories.
75.1909 Nonpermissible
diesel-powered
equipment; design and performance requirements.
75.1910 Nonpermissible
diesel-powered
equipment; electrical system design and
performance requirements.
75.1911 Fire suppression systems for dieselpowered equipment and diesel fuel transportation units.
75.1912 Fire suppression systems for permanent underground diesel fuel storage facilities.
75.1913 Starting aids.
75.1914 Maintenance
of
diesel-powered
equipment.
75.1915 Training and qualification of persons
working on diesel-powered equipment.
75.1916 Operation of diesel-powered equipment.
AUTHORITY: 30 U.S.C. 811, 813(h), 957.
SOURCE: 35 FR 17890, Nov. 20, 1970, unless
otherwise noted.
EDITORIAL NOTE: The provisions of this
part marked [Statutory Provision] appear in
Title III of the Federal Coal Mine Health and
Safety Act of 1969.
Subpart A—General
§ 75.1 Scope.
This part 75 sets forth safety standards compliance with which is mandatory in each underground coal mine
502
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00512
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.2
subject to the Federal Mine Safety and
Health Act of 1977. Some standards also
are applicable to surface operations.
Regulations
and
criteria
supplementary to these standards also are set
forth in this part.
from underground mines and which
provides at least 1 hour of protection
against carbon monoxide.
Ground fault or grounded phase. An
unintentional connection between an
electric circuit and the grounding system.
Low voltage. Up to and including 660
volts, medium voltage means voltages
from 661 to 1,000 volts; and high voltage
means more than 1,000 volts.
Motor-starter enclosure. An enclosure
containing motor starting circuits and
equipment.
Nominal voltage. The phase-to-phase
or line-to-line root-mean-square value
assigned to a circuit or system for designation of its voltage class, such as
480 or 4,160 volts. Actual voltage at
which the circuit or system operates
may vary from the nominal voltage
within a range that permits satisfactory operation of equipment.
Permissible. (1) As applied to electric
face equipment, all electrically operated equipment taken into or used inby
the last open crosscut of an entry or a
room of any coal mine the electrical
parts of which, including, but not limited to, associated electrical equipment, components, and accessories, are
designed, constructed, and installed, in
accordance with the specifications of
the Secretary, to assure that such
equipment will not cause a mine explosion or mine fire, and the other features of which are designed and constructed, in accordance with the specifications of the Secretary, to prevent,
to the greatest extent possible, other
accidents in the use of such equipment.
The regulations of the Secretary or the
Director of the Bureau of Mines in effect on March 30, 1970, relating to the
requirements for investigation, testing,
approval, certification, and acceptance
of such equipment as permissible shall
continue in effect until modified or superseded by the Secretary, except that
the Secretary shall provide procedures,
including, where feasible, testing, approval, certification, and acceptance in
the field by an authorized representative of the Secretary, to facilitate compliance by an operator with the requirements of § 75.500 within the periods prescribed in § 75.500.
kpayne on VMOFRWIN702 with $$_JOB
[35 FR 17890, Nov. 20, 1970, as amended at 43
FR 12319, Mar. 24, 1978]
§ 75.2 Definitions.
The following definitions apply in
this part.
Act. The Federal Mine Safety and
Health Act of 1977.
Active workings. Any place in a coal
mine where miners are normally required to work or travel.
Adequate interrupting capacity. The
ability of an electrical protective device, based upon its required and intended application, to safely interrupt
values of current in excess of its trip
setting or melting point.
Anthracite. Coals with a volatile ratio
equal to 0.12 or less. The volatile ratio
is the volatile matter content divided
by the volatile matter plus the fixed
carbon.
Approval documentation. Formal papers issued by the Mine Safety and
Health Administration which describe
and illustrate the complete assembly
of electrical machinery or accessories
which have met the applicable requirements of 30 CFR part 18.
Certified or registered. As applied to
any person, a person certified or registered by the State in which the coal
mine is located to perform duties prescribed by this part 75, except that in a
State where no program of certification or registration is provided or
where the program does not meet at
least minimum Federal standards established by the Secretary, such certification or registration shall be by
the Secretary.
Circuit-interrupting device. A device
designed to open and close a circuit by
nonautomatic means and to open the
circuit automatically at a predetermined overcurrent value without damage to the device when operated within
its rating.
Coal mine. Includes areas of adjoining
mines connected underground.
Filter Self-Rescuer (FSR). A type of gas
mask approved by MSHA and NIOSH
under 42 CFR part 84 for escape only
503
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00513
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.100
30 CFR Ch. I (7–1–19 Edition)
(2) As applied to equipment other
than permissible electric face equipment: (i) Equipment used in the operation of a coal mine to which an approval plate, label, or other device is
attached as authorized by the Secretary and which meets specifications
which are prescribed by the Secretary
for the construction and maintenance
of such equipment and are designed to
assure that such equipment will not
cause a mine explosion or a mine fire.
(ii) The manner of use of equipment
means the manner of use prescribed by
the Secretary.
Qualified person. As the context requires:
(1) An individual deemed qualified by
the Secretary and designated by the
operator to make tests and examinations required by this part 75; and
(2) An individual deemed, in accordance with minimum requirements to be
established by the Secretary, qualified
by training, education, and experience,
to perform electrical work, to maintain electrical equipment, and to conduct examinations and tests of all electrical equipment.
Respirable dust. Dust collected with a
sampling device approved by the Secretary and the Secretary of Health and
Human Services in accordance with
part 74—Coal Mine Dust Personal Sampler Units of this title. Sampling device approvals issued by the Secretary
of the Interior and Secretary of Health,
Education, and Welfare are continued
in effect.
Rock dust. Pulverized limestone, dolomite, gypsum, anhydrite, shale,
adobe, or other inert material, preferably light colored, 100 percent of
which will pass through a sieve having
20 meshes per linear inch and 70 percent or more of which will pass
through a sieve having 200 meshes per
linear inch; the particles of which when
wetted and dried will not cohere to
form a cake which will not be dispersed
into separate particles by a light blast
of air; and which does not contain more
than 5 percent combustible matter or
more than a total of 4 percent free and
combined silica (SiO2), or, where the
Secretary finds that such silica concentrations are not available, which
does not contain more than 5 percent
of free and combined silica.
Secretary. The Secretary of Labor or
the Secretary’s delegate.
Self-Contained Self-Rescuer (SCSR). A
type of closed-circuit, self-contained
breathing
apparatus
approved
by
MSHA and NIOSH under 42 CFR part 84
for escape only from underground
mines.
Short circuit. An abnormal connection
of relatively low impedance, whether
made accidentally or intentionally, between two points of different potential.
Working face. Any place in a coal
mine in which work of extracting coal
from its natural deposit in the earth is
performed during the mining cycle.
Working place. The area of a coal
mine inby the last open crosscut.
Working section. All areas of the coal
mine from the loading point of the section to and including the working
faces.
[57 FR 20913, May 15, 1992, as amended at 60
FR 30401, June 8, 1995; 67 FR 11001, Mar. 11,
2002]
Subpart B—Qualified and Certified
Persons
§ 75.100 Certified person.
(a) The provisions of Subpart D—
Ventilation of this part 75 require that
certain examinations and tests be
made by a certified person. A certified
person within the meaning of those
provisions is a person who has been
certified as a mine foreman (mine manager), an assistant mine foreman (section foreman), or a preshift examiner
(mine examiner). A person who has
been so certified is also a qualified person within the meaning of those provisions of subpart D of this part which
require that certain tests be made by a
qualified person and within the meaning of § 75.1106.
(b) A person who is certified as a
mine foreman, an assistant mine foreman, or a preshift examiner by the
State in which the coal mine is located
is, to the extent of the State’s certification, a certified person within the
meaning of the provisions of subpart D
of this part and § 75.1106 referred to in
paragraph (a) of this section.
(c)(1) The Secretary may certify persons in the categories of mine foreman,
assistant mine foreman, and preshift
examiner whenever the State in which
504
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00514
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.153
persons are presently employed in
these categories does not provide for
such certification. A person’s initial
certification by MSHA is valid for as
long as the person continues to satisfy
the requirements necessary to obtain
the certification and is employed at
the same coal mine or by the same
independent contractor. The mine operator or independent contractor shall
make an application which satisfactorily shows that each such person has
had at least 2 years underground experience in a coal mine, and has held the
position of mine foreman, assistant
mine foreman, or preshift examiner for
a period of 6 months immediately preceding the filing of the application, and
is qualified to test for methane and for
oxygen deficiency. Applications for
Secretarial certification should be submitted in writing to the Health and
Safety Activity, Mine Safety and
Health Administration, Certification
and Qualification Center, P.O. Box
25367, Denver Federal Center, Denver,
Colorado 80225.
(2) A person certified by the Secretary under this paragraph will be a
certified person, within the meaning of
the provisions for subpart D of this
part and § 75.1106 referred to in paragraph (a) of this section, as long as
that person continues to satisfy the requirements for qualification or certification and is employed at the same
coal mine or by the same independent
contractor.
(2) The Secretary may qualify persons for this purpose in a coal mine in
which persons are not qualified for this
purpose by the State upon an application and a satisfactory showing by the
operator of the coal mine that each
such person has been trained and designated by the operator to test for
methane and oxygen deficiency and has
made such tests for a period of 6
months immediately preceding the application. Applications for Secretarial
qualification should be submitted to
the Health and Safety Activity, Mine
Safety and Health Administration, Certification and Qualification Center,
P.O. Box 25367, Denver Federal Center,
Denver, Colo. 80225.
[35 FR 17890, Nov. 20, 1970, as amended at 43
FR 12320, Mar. 24, 1978; 54 FR 30514, July 20,
1989]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.150 Tests for methane and for oxygen deficiency; qualified person.
(a) The provisions of Subpart D—
Ventilation of this part and § 75.1106 require that tests for methane and for
oxygen deficiency be made by a qualified person. A person is a qualified person for this purpose if he is a certified
person under § 75.100.
(b) Pending issuance of Federal
standards, a person will be considered a
qualified person for testing for methane and for oxygen deficiency:
(1) If he has been qualified for this
purpose by the State in which the coal
mine is located; or
[35 FR 17890, Nov. 20, 1970, as amended at 43
FR 12320, Mar. 24, 1978]
§ 75.151 Tests for methane; qualified
person; additional requirement.
Notwithstanding the provisions of
§ 75.150, on and after January 1, 1971, no
person shall be a qualified person for
testing for methane unless he demonstrates to the satisfaction of an authorized representative of the Secretary that he is qualified to test for
methane with a portable methane detector approved by the Bureau of Mines
or the Mine Safety and Health Administration under part 22 of this chapter
(Bureau of Mines Schedule 8C).
§ 75.152 Tests of air flow; qualified person.
A person is a qualified person within
the meaning of the provisions of Subpart D—Ventilation of this part requiring that tests of air flow be made by a
qualified person only if he is a certified
person under § 75.100 or a person trained
and designated by a certified person to
perform such tests.
§ 75.153 Electrical work; qualified person.
(a) Except as provided in paragraph
(f) of this section, an individual is a
qualified person within the meaning of
§§ 75.511 and 75.512 to perform electrical
work (other than work on energized
surface high-voltage lines) if:
(1) He has been qualified as a coal
mine electrician by a State that has a
coal mine electrical qualification program approved by the Secretary; or,
505
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00515
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.154
30 CFR Ch. I (7–1–19 Edition)
(2) He has at least 1 year of experience in performing electrical work underground in a coal mine, in the surface work areas of an underground coal
mine, in a surface coal mine, in a
noncoal mine, in the mine equipment
manufacturing industry, or in any
other industry using or manufacturing
similar equipment, and has satisfactorily completed a coal mine electrical
training program approved by the Secretary; or,
(3) He has at least 1 year of experience, prior to the date of the application required by paragraph (c) of this
section, in performing electrical work
underground in a coal mine, in the surface work areas of an underground coal
mine, in a surface coal mine, in a
noncoal mine, in the mine equipment
manufacturing industry, or in any
other industry using or manufacturing
similar equipment, and he attains a
satisfactory grade on each of the series
of five written tests approved by the
Secretary and prescribed in paragraph
(b) of this section.
(b) The series of five written tests approved by the Secretary shall include
the following categories:
(1) Direct current theory and application;
(2) Alternating current theory and
application;
(3) Electric equipment and circuits;
(4) Permissibility of electric equipment; and,
(5) Requirements of subparts F
through K of this part 75.
(c) In order to take the series of five
written tests approved by the Secretary, an individual shall apply to the
District Manager and shall certify that
he meets the requirements of paragraph (a)(3) of this section. The tests
will be administered in the Coal Mine
Safety and Health Districts at regular
intervals, or as demand requires.
(d) A score of at least 80 percent of
each of the five written tests will be
deemed to be a satisfactory grade. Recognition shall be given to practical experience in that 1 percentage point
shall be added to an individual’s score
in each test for each additional year of
experience beyond the 1 year minimum
requirement specified in paragraph
(a)(3) of this section; however, in no
case shall an individual be given more
than 5 percentage points for such practical experience.
(e) An individual may, within 30 days
from the date on which he received notification from the Administration of
his test scores, repeat those on which
he received an unsatisfactory score. If
further retesting is necessary after this
initial repetition, a minimum of 30
days from the date of receipt of notification of the initial retest scores shall
elapse prior to such further retesting.
(f) An individual who has, prior to
November 1, 1972, been qualified to perform electrical work specified in
§§ 75.511 and 75.512 (other than work on
energized surface high-voltage lines)
shall continue to be qualified until
June 30, 1973. To remain qualified after
June 30, 1973, such individual shall
meet the requirements of either paragraph (a) (1), (2), or (3) of this section.
(g) An individual qualified in accordance with this section shall, in order to
retain qualification, certify annually
to the District Manager, that he has
satisfactorily completed a coal mine
electrical retraining program approved
by the Secretary.
[37 FR 22376, Oct. 19, 1972, as amended at 44
FR 9380, Feb. 13, 1979; 47 FR 23641, May 28,
1982]
§ 75.154 Repair of energized surface
high voltage lines; qualified person.
An individual is a qualified person
within the meaning of § 75.705 for the
purpose of repairing energized surface
high voltage lines only if he has had at
least 2 years experience in electrical
maintenance, and at least 2 years experience in the repair of energized high
voltage surface lines located on poles
or structures.
§ 75.155 Qualified hoisting engineer;
qualifications.
(a)(1) A person is a qualified hoisting
engineer within the provisions of subpart O of this part, for the purpose of
operating a steam-driven hoist in a
coal mine, if he has at least 1 year experience as an engineer in a steamdriven hoisting plant and is qualified
by the State in which the mine is located as a steam-hoisting engineer; or
(2) If a State has no program for
qualifying persons as steam-hoisting
engineers, the Secretary may qualify
506
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00516
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.200
persons for this purpose if the operator
of the coal mine in which such persons
are employed, or the independent contractor, makes an application and a
satisfactory showing that each such
person has had 1 year experience in operating steam-driven hoists and has
held the position of hoisting engineer
for a periond of 6 months immediately
preceding the application. A person’s
qualification is valid for as long as this
person continues to satisfy the requirements necessary for qualification and
is employed at the same coal mine or
by the same independent contractor.
(b)(1) A person is a qualified hoisting
engineer within the provisions of subpart O of this part, for the purpose of
operating an electrically driven hoist
in a coal mine, if he has at least 1 year
experience operating a hoist plant in a
mine or maintaining electric-hoist
equipment in a mine and is qualified by
the State in which the mine is located
as an electric-hoisting engineer; or
(2) If a State has no program for
qualifying persons as electric-hoisting
engineers, the Secretary may qualify
persons for this purpose if the operator
of the coal mine in which such persons
are employed, or the independent contractor, makes an application and a
satisfactory showing that each such
person has had 1 year experience in operating electric-driven hoists and has
held the position of hoisting engineer
for a period of 6 months immediately
preceding the application. A person’s
qualification is valid for as long as this
person continues to satisfy the requirements for qualification and is employed at the same coal mine or by the
same independent contractor.
(c) Applications for Secretarial qualification should be submitted to the
Health and Safety Activity, Mine Safety and Health Administration, Certification and Qualification Center, P.O.
Box 25367, Denver Federal Center, Denver, Colo. 80225.
ator is employed in accordance with
the mine operator’s approved Part 48
training plan.
(b) An AMS operator must be able to
demonstrate to an authorized representative of the Secretary that he/
she is qualified to perform in the assigned position.
[73 FR 80612, Dec. 31, 2008]
§ 75.159 Records of certified and qualified persons.
The operator of each coal mine shall
maintain a list of all certified and
qualified persons designated to perform
duties under this part 75.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.160
Training programs.
[STATUTORY PROVISION]
Every operator of a coal mine shall provide
a program, approved by the Secretary, of
training and retraining of both qualified and
certified persons needed to carry out functions prescribed in the Act.
§ 75.161 Plans for training programs.
Each operator must submit to the
district manager, of the Coal Mine
Safety and Health District in which
the mine is located, a program or plan
setting forth what, when, how, and
where the operator will train and retrain persons whose work assignments
require that they be certified or qualified. The program must provide—
(a) For certified persons, annual
training courses in first aid, principles
of mine rescue, and the provisions of
this part 75; and
(b) For qualified persons, annual
courses in performance of the task
which they perform as qualified persons.
[63 FR 53761, Oct. 6, 1998]
Subpart C—Roof Support
[35 FR 17894, Nov. 20, 1970, as amended at 43
FR 12320, Mar. 24, 1978; 54 FR 30515, July 20,
1989]
SOURCE: 53 FR 2375, Jan. 27, 1988, unless
otherwise noted.
§ 75.156 AMS operator, qualifications.
(a) To be qualified as an AMS operator, a person shall be provided with
task training on duties and responsibilities at each mine where an AMS oper-
§ 75.200 Scope.
This subpart C sets forth requirements for controlling roof, face and
ribs, including coal or rock bursts, in
underground coal mines. Roof control
507
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00517
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.201
30 CFR Ch. I (7–1–19 Edition)
systems installed prior to the effective
date of this subpart are not affected so
long as the support system continues
to effectively control the roof, face and
ribs.
§ 75.201 Definitions.
Automated temporary roof support
(ATRS) system. A device to provide temporary roof support from a location
where the equipment operator is protected from roof falls.
Pillar recovery. Any reduction in pillar size during retreat mining.
§ 75.202 Protection from falls of roof,
face and ribs.
(a) The roof, face and ribs of areas
where persons work or travel shall be
supported or otherwise controlled to
protect persons from hazards related to
falls of the roof, face or ribs and coal or
rock bursts.
(b) No person shall work or travel
under unsupported roof unless in accordance with this subpart.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.203 Mining methods.
(a) The method of mining shall not
expose any person to hazards caused by
excessive widths of rooms, crosscuts
and entries, or faulty pillar recovery
methods. Pillar dimensions shall be
compatible with effective control of
the roof, face and ribs and coal or rock
bursts.
(b) A sightline or other method of directional control shall be used to maintain the projected direction of mining
in entries, rooms, crosscuts and pillar
splits.
(c) A sidecut shall be started only
from an area that is supported in accordance with the roof control plan.
(d) A working face shall not be mined
through into an unsupported area of
active workings, except when the unsupported area is inaccessible.
(e) Additional roof support shall be
installed where—
(1) The width of the opening specified
in the roof control plan is exceeded by
more than 12 inches; and
(2) The distance over which the excessive width exists is more than 5 feet.
§ 75.204 Roof bolting.
(a) For roof bolts and accessories addressed in ASTM F432–95, ‘‘Standard
Specification for Roof and Rock Bolts
and Accessories,’’ the mine operator
shall—
(1) Obtain a manufacturer’s certification that the material was manufactured and tested in accordance with
the specifications of ASTM F432–95;
and
(2) Make this certification available
to an authorized representative of the
Secretary and to the representative of
miners.
(b) Roof bolts and accessories not addressed in ASTM F432–95 may be used,
provided that the use of such materials
is approved by the District Manager
based on—
(1) Demonstrations which show that
the materials have successfully supported the roof in an area of a coal
mine with similar strata, opening dimensions and roof stresses; or
(2) Tests which show the materials to
be effective for supporting the roof in
an area of the affected mine which has
similar strata, opening dimensions and
roof stresses as the area where the roof
bolts are to be used. During the test
process, access to the test area shall be
limited to persons necessary to conduct the test.
(c)(1) A bearing plate shall be firmly
installed with each roof bolt.
(2) Bearing plates used directly
against the mine roof shall be at least
6 inches square or the equivalent, except that where the mine roof is firm
and not susceptible to sloughing, bearing plates 5 inches square or the equivalent may be used.
(3) Bearing plates used with wood or
metal materials shall be at least 4
inches square or the equivalent.
(4) Wooden materials that are used
between a bearing plate and the mine
roof in areas which will exist for three
years or more shall be treated to minimize deterioration.
(d) When washers are used with roof
bolts, the washers shall conform to the
shape of the roof bolt head and bearing
plate.
(e)(1) The diameter of finishing bits
shall be within a tolerance of plus or
minus 0.030 inch of the manufacturer’s
recommended hole diameter for the anchor used.
508
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00518
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.205
(2) When separate finishing bits are
used, they shall be distinguishable
from other bits.
(f) Tensioned roof bolts. (1) Roof bolts
that provide support by creating a
beam of laminated strata shall be at
least 30 inches long. Roof bolts that
provide support by suspending the roof
from overlying stronger strata shall be
long enough to anchor at least 12
inches into the stronger strata.
(2) Test holes, spaced at intervals
specified in the roof control plan, shall
be drilled to a depth of at least 12
inches above the anchorage horizon of
mechanically anchored tensioned bolts
being used. When a test hole indicates
that bolts would not anchor in competent strata, corrective action shall
be taken.
(3) The installed torque or tension
ranges for roof bolts as specified in the
roof control plan shall maintain the integrity of the support system and shall
not exceed the yield point of the roof
bolt nor anchorage capacity of the
strata.
(4) In each roof bolting cycle, the actual torque or tension of the first tensioned roof bolt installed with each
drill head shall be measured immediately after it is installed. Thereafter,
for each drill head used, at least one
roof bolt out of every four installed
shall be measured for actual torque or
tension. If the torque or tension of any
of the roof bolts measured is not within
the range specified in the roof control
plan, corrective action shall be taken.
(5) In working places from which coal
is produced during any portion of a 24hour period, the actual torque or tension on at least one out of every ten
previously installed mechanically anchored tensioned roof bolts shall be
measured from the outby corner of the
last open crosscut to the face in each
advancing section. Corrective action
shall be taken if the majority of the
bolts measured—
(i) Do not maintain at least 70 percent of the minimum torque or tension
specified in the roof control plan, 50
percent if the roof bolt plates bear
against wood; or
(ii) Have exceeded the maximum
specified torque or tension by 50 percent.
(6) The mine operator or a person
designated by the operator shall certify
by signature and date that measurements required by paragraph (f)(5) of
this section have been made. This certification shall be maintained for at
least one year and shall be made available to an authorized representative of
the Secretary and representatives of
the miners.
(7) Tensioned roof bolts installed in
the roof support pattern shall not be
used to anchor trailing cables or used
for any other purpose that could affect
the tension of the bolt. Hanging trailing cables, line brattice, telephone
lines, or other similar devices which do
not place sudden loads on the bolts are
permitted.
(8) Angle compensating devices shall
be used to compensate for the angle
when tensioned roof bolts are installed
at angles greater than 5 degrees from
the perpendicular to the bearing plate.
(g) Non-tensioned grouted roof bolts.
The first non-tensioned grouted roof
bolt installed during each roof bolting
cycle shall be tested during or immediately after the first row of bolts has
been installed. If the bolt tested does
not withstand at least 150 foot-pounds
of torque without rotating in the hole,
corrective action shall be taken.
[53 FR 2375, Jan. 27, 1988, as amended at 55
FR 4595, Feb. 8, 1990; 63 FR 20030, Apr. 22,
1998]
§ 75.205 Installation of roof support
using mining machines with integral roof bolters.
When roof bolts are installed by a
continuous
mining
machine
with
intregal roof bolting equipment:
(a) The distance between roof bolts
shall not exceed 10 feet crosswise.
(b) Roof bolts to be installed 9 feet or
more apart shall be installed with a
wooden crossbar at least 3 inches thick
and 8 inches wide, or material which
provides equivalent support.
(c) Roof bolts to be installed more
than 8 feet but less than 9 feet apart
shall be installed with a wooden plank
at least 2 inches thick and 8 inches
wide, or material which provides equivalent support.
509
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00519
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.206
30 CFR Ch. I (7–1–19 Edition)
§ 75.206 Conventional roof support.
(a) Except in anthracite mines using
non-mechanized mining systems, when
conventional roof support materials
are used as the only means of support—
(1) The width of any opening shall
not exceed 20 feet;
(2) The spacing of roadway roof support shall not exceed 5 feet;
(3)(i) Supports shall be installed to
within 5 feet of the uncut face;
(ii) When supports nearest the face
must be removed to facilitate the operation of face equipment, equivalent
temporary support shall be installed
prior to removing the supports;
(4) Straight roadways shall not exceed 16 feet wide where full overhead
support is used and 14 feet wide where
only posts are used;
(5) Curved roadways shall not exceed
16 feet wide; and
(6) The roof at the entrance of all
openings along travelways which are
no longer needed for storing supplies or
for travel of equipment shall be supported by extending the line of support
across the opening.
(b) Conventional roof support materials shall meet the following specifications:
(1) The minimum diameter of crosssectional area of wooden posts shall be
as follows:
Post length (in inches)
Diameter of
round posts
(in inches)
kpayne on VMOFRWIN702 with $$_JOB
60 or less ................................
Over 60 to 84 ..........................
Over 84 to 108 ........................
Over 108 to 132 ......................
Over 132 to 156 ......................
Over 156 to 180 ......................
Over 180 to 204 ......................
Over 204 to 228 ......................
Over 228 .................................
Cross-sectional area of
split posts (in
square
inches)
4
5
6
7
8
9
10
11
12
13
20
28
39
50
64
79
95
113
(2) Wooden materials used for support
shall have the following dimensions:
(i) Cap blocks and footings shall have
flat sides and be at least 2 inches thick,
4 inches wide and 12 inches long.
(ii) Crossbars shall have a minimum
cross-sectional area of 24 square inches
and be at least 3 inches thick.
(iii) Planks shall be at least 6 inches
wide and 1 inch thick.
(3) Cribbing materials shall have at
least two parallel flat sides.
(c) A cluster of two or more posts
that provide equivalent strength may
be used to meet the requirements of
paragraph (b)(1) of this section, except
that no post shall have a diameter less
than 4 inches or have a cross-sectional
area less than 13 square inches.
(d) Materials other than wood used
for support shall have support strength
at least equivalent to wooden material
meeting the applicable provisions of
this section.
(e) Posts and jacks shall be tightly
installed on solid footing.
(f) When posts are installed under
roof susceptible to sloughing a cap
block, plank, crossbar or materials
that are equally effective shall be
placed between the post and the roof.
(g) Blocks used for lagging between
the roof and crossbars shall be spaced
to distribute the load.
(h) Jacks used for roof support shall
be used with at least 36 square inches
of roof bearing surface.
[53 FR 2375, Jan. 27, 1988, as amended at 55
FR 14228, Apr. 16, 1990; 55 FR 20137, May 15,
1990]
§ 75.207 Pillar recovery.
Pillar recovery shall be conducted in
the following manner, unless otherwise
specified in the roof control plan:
(a) Full and partial pillar recovery
shall not be conducted on the same pillar line, except where physical conditions such as unstable floor or roof,
falls of roof, oil and gas well barriers or
surface subsidence require that pillars
be left in place.
(b) Before mining is started in a pillar split or lift—
(1) At least two rows of breaker posts
or equivalent support shall be installed—
(i) As close to the initial intended
breakline as practicable; and
(ii) Across each opening leading into
an area where full or partial pillar extraction has been completed.
(2) A row of roadside-radius (turn)
posts or equivalent support shall be installed leading into the split or lift.
(c) Before mining is started on a final
stump—
(1) At least 2 rows of posts or equivalent support shall be installed on not
more than 4-foot centers on each side
of the roadway; and
510
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00520
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.210
(2) Only one open roadway, which
shall not exceed 16 feet wide, shall lead
from solid pillars to the final stump of
a pillar. Where posts are used as the
sole means of roof support, the width of
the roadway shall not exceed 14 feet.
(d) During open-end pillar extraction,
at least 2 rows of breaker posts or
equivalent support shall be installed on
not more than 4-foot centers. These
supports shall be installed between the
lift to be started and the area where
pillars have been extracted. These supports shall be maintained to within 7
feet of the face and the width of the
roadway shall not exceed 16 feet. Where
posts are used as the sole means of roof
support, the width of the roadway shall
not exceed 14 feet.
(1)
Mining
conditions
or
circumstances prevent the use of an
ATRS system; or
(2) Temporary supports are installed
in conjunction with an ATRS system.
(d) Persons shall work or travel between the support device of the ATRS
system and another support, and the
distance between the support device of
the ATRS system and support to the
left, right or beyond the ATRS system,
shall not exceed 5 feet.
(e) Each ATRS system shall meet
each of the following:
(1) The ATRS system shall elastically support a deadweight load
measured in pounds of at least 450
times each square foot of roof intended
to be supported, but in no case less
than 11,250 pounds.
(2) The controls that position and set
the ATRS system shall be—
(i) Operable from under permanently
supported roof; or
(ii) Located in a compartment, which
includes a deck, that provides the
equipment operator with overhead and
lateral protection, and has the structural capacity to elastically support a
deadweight load of at least 18,000
pounds.
(3) All jacks affecting the capacity of
the ATRS system and compartment
shall have check valves or equivalent
devices that will prevent rapid collapse
in the event of a system failure.
(4) Except for the main tram controls, tram controls for positioning the
equipment to set the ATRS system
shall limit the speed of the equipment
to a maximum of 80 feet-per-minute.
(f) The support capacity of each
ATRS system and the structural capacity of each compartment shall be certified by a registered engineer as meeting the applicable requirements of
paragraphs (e)(1) and (e)(2) of this section. The certifications shall be made
available to an authorized representative of the Secretary and representative of the miners.
§ 75.208
Warning devices.
Except during the installation of roof
supports, the end of permanent roof
support shall be posted with a readily
visible warning, or a physical barrier
shall be installed to impede travel beyond permanent support.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.209 Automated Temporary
Support (ATRS) systems.
Roof
(a) Except in anthracite mines and as
specified in paragraphs (b) and (c) of
this section, an ATRS system shall be
used with roof bolting machines and
continuous-mining machines with integral roof bolters operated in a working
section. The requirements of this paragraph shall be met according to the following schedule:
(1) All new machines ordered after
March 28, 1988.
(2) All existing machines operated in
mining heights of 36 inches or more
after March 28, 1989; and
(3) All existing machines operated in
mining heights of 30 inches or more but
less than 36 inches after March 28, 1990.
(b) After March 28, 1990 the use of
ATRS systems with existing roof bolting machines and continuous-mining
machines with integral roof bolters operated in a working section where the
mining height is less than 30 inches
shall be addressed in the roof control
plan.
(c) Alternative means of temporary
support shall be used, as specified in
the roof control plan, when—
§ 75.210 Manual installation of temporary support.
(a) When manually installing temporary support, only persons engaged
in installing the support shall proceed
beyond permanent support.
511
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00521
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.211
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
(b) When manually installing temporary supports, the first temporary
support shall be set no more than 5 feet
from a permanent roof support and the
rib. All temporary supports shall be set
so that the person installing the supports remains between the temporary
support being set and two other supports which shall be no more than 5
feet from the support being installed.
Each temporary support shall be completely installed prior to installing the
next temporary support.
(c) All temporary supports shall be
placed on no more than 5-foot centers.
(d) Once temporary supports have
been installed, work or travel beyond
permanent roof support shall be done
between temporary supports and the
nearest permanent support or between
other temporary supports.
§ 75.211 Roof testing and scaling.
(a) A visual examination of the roof,
face and ribs shall be made immediately before any work is started in an
area and thereafter as conditions warrant.
(b) Where the mining height permits
and the visual examination does not
disclose a hazardous condition, sound
and vibration roof tests, or other
equivalent tests, shall be made where
supports are to be installed. When
sound and vibration tests are made,
they shall be conducted—
(1) After the ATRS system is set
against the roof and before other support is installed; or
(2) Prior to manually installing a
roof support. This test shall begin
under supported roof and progress no
further than the location where the
next support is to be installed.
(c) When a hazardous roof, face, or
rib condition is detected, the condition
shall be corrected before there is any
other work or travel in the affected
area. If the affected area is left unattended, each entrance to the area shall
be posted with a readily visible warning, or a physical barrier shall be installed to impede travel into the area.
(d) A bar for taking down loose material shall be available in the working
place or on all face equipment except
haulage equipment. Bars provided for
taking down loose material shall be of
a length and design that will allow the
removal of loose material from a position that will not expose the person
performing this work to injury from
falling material.
§ 75.212 Rehabilitation of areas with
unsupported roof.
(a) Before rehabilitating each area
where a roof fall has occurred or the
roof has been removed by mining machines or by blasting—
(1) The mine operator shall establish
the clean up and support procedures
that will be followed;
(2) All persons assigned to perform
rehabilitation work shall be instructed
in the clean-up and support procedures;
and
(3) Ineffective, damaged or missing
roof support at the edge of the area to
be rehabilitated shall be replaced or
other equivalent support installed.
(b) All persons who perform rehabilitation work shall be experienced in
this work or they shall be supervised
by a person experienced in rehabilitation work who is designated by the
mine operator.
(c) Where work is not being performed to rehabilitate an area in active workings where a roof fall has occurred or the roof has been removed by
mining machines or by blasting, each
entrance to the area shall be supported
by at least one row of posts on not
more than 5-foot centers, or equally effective support.
§ 75.213
Roof support removal.
(a)(1) All persons who perform the
work of removing permanent roof supports shall be supervised by a management person experienced in removing
roof supports.
(2) Only persons with at least one
year of underground mining experience
shall perform permanent roof support
removal work.
(b) Prior to the removal of permanent roof supports, the person supervising roof support removal in accordance with paragraph (a)(1) of this section shall examine the roof conditions
in the area where the supports are to
be removed and designate each support
to be removed.
(c)(1) Except as provided in paragraph
(g) of this section, prior to the removal
512
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00522
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.220
of permanent supports, a row of temporary supports on no more than 5-foot
centers or equivalent support shall be
installed across the opening within 4
feet of the supports being removed. Additional supports shall be installed
where necessary to assure safe removal.
(2) Prior to the removal of roof bolts,
temporary support shall be installed as
close as practicable to each roof bolt
being removed.
(d) Temporary supports installed in
accordance with this section shall not
be removed unless—
(1) Removal is done by persons who
are in a remote location under supported roof; and
(2) At least two rows of temporary
supports, set across the opening on no
more than 5-foot centers, are maintained between the miners and the unsupported area.
(e) Each entrance to an area where
supports have been removed shall be
posted with a readily visible warning
or a physical barrier shall be installed
to impede travel into the area.
(f) Except as provided in paragraph
(g) of this section, permanent support
shall not be removed where—
(1) Roof bolt torque or tension measurements or the condition of conventional support indicate excessive loading;
(2) Roof fractures are present;
(3) There is any other indication that
the roof is structurally weak; or
(4) Pillar recovery has been conducted.
(g) Permanent supports may be removed provided that:
(1) Removal is done by persons who
are in a remote location under supported roof; and
(2) At least two rows of temporary
supports, set across the opening on no
more than 5-foot centers, are maintained between the miners and the unsupported area.
(h) The provisions of this section do
not apply to removal of conventional
supports for starting crosscuts and pillar splits or lifts except that prior to
the removal of these supports an examination of the roof conditions shall be
made.
§ 75.214 Supplemental support materials, equipment and tools.
(a) A supply of supplementary roof
support materials and the tools and
equipment necessary to install the materials shall be available at a readily
accessible location on each working
section or within four crosscuts of each
working section.
(b) The quantity of support materials
and tools and equipment maintained
available in accordance with this section shall be sufficient to support the
roof if adverse roof conditions are encountered, or in the event of an accident involving a fall.
[55 FR 4595, Feb. 8, 1990]
§ 75.215 Longwall mining systems.
For each longwall mining section,
the roof control plan shall specify—
(a) The methods that will be used to
maintain a safe travelway out of the
section through the tailgate side of the
longwall; and
(b) The procedures that will be followed if a ground failure prevents travel out of the section through the tailgate side of the longwall.
§ 75.220 Roof control plan.
(a)(1) Each mine operator shall develop and follow a roof control plan,
approved by the District Manager, that
is suitable to the prevailing geological
conditions, and the mining system to
be used at the mine. Additional measures shall be taken to protect persons
if unusual hazards are encountered.
(2) The proposed roof control plan
and any revisions to the plan shall be
submitted, in writing, to the District
Manager. When revisions to a roof control plan are proposed, only the revised
pages need to be submitted unless otherwise specified by the District Manager.
(b)(1) The mine operator will be notified in writing of the approval or denial
of approval of a proposed roof control
plan or proposed revision.
(2) When approval of a proposed plan
or revision is denied, the deficiencies of
the plan or revision and recommended
changes will be specified and the mine
operator will be afforded an opportunity to discuss the deficiencies and
changes with the District Manager.
(3) Before new support materials, devices or systems other than roof bolts
513
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00523
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.221
30 CFR Ch. I (7–1–19 Edition)
and accessories, are used as the only
means of roof support, the District
Manager may require that their effectiveness be demonstrated by experimental installations.
(c) No proposed roof control plan or
revision to a roof control plan shall be
implemented before it is approved.
(d) Before implementing an approved
revision to a roof control plan, all persons who are affected by the revision
shall be instructed in its provisions.
(e) The approved roof control plan
and any revisions shall be available to
the miners and representative of miners at the mine.
[53 FR 2375, Jan. 27, 1988; 53 FR 11395, Apr. 6,
1988, as amended at 60 FR 33723, June 29, 1995;
71 FR 16668, Apr. 3, 2006]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.221
Roof control plan information.
(a) The following information shall
be included in each roof control plan:
(1) The name and address of the company.
(2) The name, address, mine identification number and location of the
mine.
(3) The name and title of the company official responsible for the plan.
(4) A typical columnar section of the
mine strata which shall—
(i) Show the name and the thickness
of the coalbed to be mined and any persistent partings;
(ii) Identify the type and show the
thickness of each stratum up to and including the main roof above the coalbed and for distance of at least 10 feet
below the coalbed; and
(iii) Indicate the maximum cover
over the area to be mined.
(5) A description and drawings of the
sequence of installation and spacing of
supports for each method of mining
used.
(6) When an ATRS system is used,
the maximum distance that an ATRS
system is to be set beyond the last row
of permanent support.
(7) When tunnel liners or arches are
to be used for roof support, specifications and installation procedures for
the liners or arches.
(8) Drawings indicating the planned
width of openings, size of pillars, method of pillar recovery, and the sequence
of mining pillars.
(9) A list of all support materials required to be used in the roof, face and
rib control system, including, if roof
bolts are to be installed—
(i) The length, diameter, grade and
type of anchorage unit to be used;
(ii) The drill hole size to be used; and
(iii) The installed torque or tension
range for tensioned roof bolts.
(10) When mechanically anchored
tensioned roof bolts are used, the intervals at which test holes will be drilled.
(11) A description of the method of
protecting persons—
(i) From falling material at drift
openings; and
(ii) When mining approaches within
150 feet of an outcrop.
(12) A description of the roof and rib
support necessary for the refuge alternatives.
(b) Each drawing submitted with a
roof control plan shall contain a legend
explaining all symbols used and shall
specify the scale of the drawing which
shall not be less than 5 feet to the inch
or more than 20 feet to the inch.
(c) All roof control plan information,
including drawings, shall be submitted
on 81⁄2 by 11 inch paper, or paper folded
to this size.
[53 FR 2375, Jan. 27, 1988, as amended at 60
FR 33723, June 29, 1995; 73 FR 80697, Dec. 31,
2008]
§ 75.222 Roof
criteria.
control
(a) This section sets forth the criteria that shall be considered on a
mine-by-mine basis in the formulation
and approval of roof control plans and
revisions. Additional measures may be
required in plans by the District Manager. Roof control plans that do not
conform to the applicable criteria in
this section may be approved by the
District Manager, provided that effective control of the roof, face and ribs
can be maintained.
(b) Roof Bolting. (1) Roof bolts should
be installed on centers not exceeding 5
feet lengthwise and crosswise, except
as specified in § 75.205.
(2) When tensioned roof bolts are
used as a means of roof support, the
torque or tension range should be capable of supporting roof bolt loads of at
least 50 percent of either the yield
514
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00524
Fmt 8010
plan-approval
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.223
point of the bolt or anchorage capacity
of the strata, whichever is less.
(3) Any opening that is more than 20
feet wide should be supported by a
combination of roof bolts and conventional supports.
(4) In any opening more than 20 feet
wide—
(i) Posts should be installed to limit
each roadway to 16 feet wide where
straight and 18 feet wide where curved;
and
(ii) A row of posts should be set for
each 5 feet of space between the roadway posts and the ribs.
(5) Openings should not be more than
30 feet wide.
(c) Installation of roof support using
mining machines with integral roof bolters. (1) Before an intersection or pillar
split is started, roof bolts should be installed on at least 5-foot centers where
the work is performed.
(2) Where the roof is supported by
only two roof bolts crosswise, openings
should not be more than 16 feet wide.
(d) Pillar recovery. (1) During development, any dimension of a pillar should
be at least 20 feet.
(2) Pillar splits and lifts should not
be more than 20 feet wide.
(3) Breaker posts should be installed
on not more than 4-foot centers.
(4) Roadside-radius (turn) posts, or
equivalent support, should be installed
on not more than 4-foot centers leading
into each pillar split or lift.
(5) Before full pillar recovery is started in areas where roof bolts are used as
the only means of roof support and
openings are more than 16 feet wide, at
least one row of posts should be installed to limit the roadway width to
16 feet. These posts should be—
(i) Extended from the entrance to the
split through the intersection outby
the pillar in which the split or lift is
being made; and
(ii) Spaced on not more than 5-foot
centers.
(e) Unsupported openings at intersections. Openings that create an intersection should be permanently supported
or at least one row of temporary supports should be installed on not more
than 5-foot centers across the opening
before any other work or travel in the
intersection.
(f) ATRS systems in working sections
where the mining height is below 30
inches. In working sections where the
mining height is below 30 inches, an
ATRS system should be used to the extent practicable during the installation
of roof bolts with roof bolting machines and continuous-mining machines with integral roof bolters.
(g) Longwall mining systems. (1) Systematic supplemental support should
be installed throughout—
(i) The tailgate entry of the first
longwall panel prior to any mining;
and
(ii) In the proposed tailgate entry of
each subsequent panel in advance of
the frontal abutment stresses of the
panel being mined.
(2) When a ground failure prevents
travel out of the section through the
tailgate side of the longwall section,
the roof control plan should address—
(i) Notification of miners that the
travelway is blocked;
(ii) Re-instruction of miners regarding escapeways and escape procedures
in the event of an emergency;
(iii) Re-instruction of miners on the
availability and use of self-contained
self-rescue devices;
(iv) Monitoring and evaluation of the
air entering the longwall section;
(v) Location and effectiveness of the
two-way communication systems; and
(vi) A means of transportation from
the section to the main line.
(3) The plan provisions addressed by
paragraph (g)(2) of this section should
remain in effect until a travelway is reestablished on the tailgate side of a
longwall section.
§ 75.223 Evaluation and
roof control plan.
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00525
Fmt 8010
of
(a) Revisions of the roof control plan
shall be proposed by the operator—
(1) When conditions indicate that the
plan is not suitable for controlling the
roof, face, ribs, or coal or rock bursts;
or
(2) When accident and injury experience at the mine indicates the plan is
inadequate. The accident and injury
experience at each mine shall be reviewed at least every six months.
(b) Each unplanned roof fall and rib
fall and coal or rock burst that occurs
515
VerDate Sep<11>2014
revision
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.300
30 CFR Ch. I (7–1–19 Edition)
in the active workings shall be plotted
on a mine map if it—
(1) Is above the anchorage zone where
roof bolts are used;
(2) Impairs ventilation;
(3) Impedes passage of persons;
(4) Causes miners to be withdrawn
from the area affected; or
(5) Disrupts regular mining activities
for more than one hour.
(c) The mine map on which roof falls
are plotted shall be available at the
mine site for inspection by authorized
representatives of the Secretary and
representatives of miners at the mine.
(d) The roof control plan for each
mine shall be reviewed every six
months by an authorized representative of the Secretary. This review shall
take into consideration any falls of the
roof, face and ribs and the adequacy of
the support systems used at the time.
[53 FR 2375, Jan. 27, 1988; 60 FR 33723, June 29,
1995]
Subpart D—Ventilation
AUTHORITY: 30 U.S.C. 811, 863.
SOURCE: 61 FR 9829, Mar. 11, 1996, unless
otherwise noted.
§ 75.300
Scope.
This subpart sets requirements for
underground coal mine ventilation.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.301
Definitions.
In addition to the applicable definitions in § 75.2, the following definitions
apply in this subpart.
Air course. An entry or a set of entries separated from other entries by
stoppings, overcasts, other ventilation
control devices, or by solid blocks of
coal or rock so that any mixing of air
currents between each is limited to
leakage.
AMS operator. The person(s), designated by the mine operator, who is
located on the surface of the mine and
monitors the malfunction, alert, and
alarm signals of the AMS and notifies
appropriate personnel of these signals.
Appropriate personnel. The person or
persons designated by the operator to
perform specific tasks in response to
AMS signals. Appropriate personnel include the responsible person(s) required
by § 75.1501 when an emergency evacuation is necessary.
Atmospheric Monitoring System (AMS).
A network consisting of hardware and
software meeting the requirements of
§§ 75.351 and 75.1103–2 and capable of:
measuring atmospheric parameters;
transmitting the measurements to a
designated surface location; providing
alert and alarm signals; processing and
cataloging atmospheric data; and, providing reports. Early-warning fire detection systems using newer technology that provides equal or greater
protection, as determined by the Secretary, will be considered atmospheric
monitoring systems for the purposes of
this subpart.
Belt air course. The entry in which a
belt is located and any adjacent
entry(ies) not separated from the belt
entry by permanent ventilation controls, including any entries in series
with the belt entry, terminating at a
return regulator, a section loading
point, or the surface.
Carbon monoxide ambient level. The average concentration in parts per million (ppm) of carbon monoxide detected
in an air course containing carbon
monoxide sensors. This average concentration is representative of the
composition of the mine atmosphere
over a period of mining activity during
non-fire conditions. Separate ambient
levels may be established for different
areas of the mine.
Incombustible. Incapable of being
burned.
Intake air. Air that has not yet ventilated the last working place on any
split of any working section, or any
worked-out area, whether pillared or
nonpillared.
Intrinsically safe. Incapable of releasing enough electrical or thermal energy under normal or abnormal conditions to cause ignition of a flammable
mixture of methane or natural gas and
air of the most easily ignitable composition.
Noncombustible structure or area. Describes a structure or area that will
continue to provide protection against
flame spread for at least 1 hour when
subjected to a fire test incorporating
an ASTM E119–88 time/temperature
heat input, or equivalent. The publication ASTM E119–88 ‘‘Standard Test
516
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00526
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.310
Methods for Fire Tests of Building Construction and Materials’’ is incorporated by reference and may be inspected at any MSHA Coal Mine Safety
and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; or at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorporation by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
Noncombustible material. Describes a
material that, when used to construct
a ventilation control, results in a control that will continue to serve its intended function for 1 hour when subjected to a fire test incorporating an
ASTM E119–88 time/temperature heat
input, or equivalent. The publication
ASTM E119–88 ‘‘Standard Test Methods
for Fire Tests of Building Construction
and Materials’’ is incorporated by reference and may be inspected at any
Coal Mine Safety and Health District
Office, or at MSHA’s Office of Standards, Regulations, and Variances, 201
12th Street South, Arlington, VA 22202–
5452; 202–693–9440; or at the National Archives and Records Administration
(NARA). For information on the availability of this material at NARA, call
202–741–6030,
or
go
to:
http://
www.archives.gov/federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorporation by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
Point feeding. The process of providing additional intake air to the belt
air course from another intake air
course through a regulator.
Return air. Air that has ventilated
the last working place on any split of
any working section or any worked-out
area whether pillared or nonpillared. If
air mixes with air that has ventilated
the last working place on any split of
any working section or any worked-out
area, whether pillared or nonpillared,
it is considered return air. For the purposes of § 75.507–1, air that has been
used to ventilate any working place in
a coal producing section or pillared
area, or air that has been used to ventilate any working face if such air is directed away from the immediate return
is return air. Notwithstanding the definition of intake air, for the purpose of
ventilation of structures, areas or installations that are required by this
subpart D to be ventilated to return air
courses, and for ventilation of seals,
other air courses may be designated as
return air courses by the operator only
when the air in these air courses will
not be used to ventilate working places
or other locations, structures, installations or areas required to be ventilated
with intake air.
Worked-out area. An area where mining has been completed, whether
pillared or nonpillared, excluding developing entries, return air courses,
and intake air courses.
[61 FR 9829, Mar. 11, 1996; 61 FR 29288, June
10, 1996, as amended at 67 FR 38386, June 4,
2002; 69 FR 17526, Apr. 2, 2004; 71 FR 16668,
Apr. 3, 2006; 80 FR 52990, Sept. 2, 2015]
§ 75.302 Main mine fans.
Each coal mine shall be ventilated by
one or more main mine fans. Booster
fans shall not be installed underground
to assist main mine fans except in anthracite mines. In anthracite mines,
booster fans installed in the main air
current or a split of the main air current may be used provided their use is
approved in the ventilation plan.
§ 75.310 Installation of main mine fans.
(a) Each main mine fan shall be—
(1) Installed on the surface in an incombustible housing;
517
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00527
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.310
30 CFR Ch. I (7–1–19 Edition)
(2) Connected to the mine opening
with incombustible air ducts;
(3) Equipped with an automatic device that gives a signal at the mine
when the fan either slows or stops. A
responsible person designated by the
operator shall always be at a surface
location at the mine where the signal
can be seen or heard while anyone is
underground. This person shall be provided with two-way communication
with the working sections and work
stations where persons are routinely
assigned to work for the majority of a
shift;
(4) Equipped with a pressure recording device or system. Mines permitted
to shut down main mine fans under
§ 75.311 and which do not have a pressure recording device installed on main
mine fans shall have until June 10, 1997
to install a pressure recording device
or system on all main mine fans. If a
device or system other than a circular
pressure recorder is used to monitor
main mine fan pressure, the monitoring device or system shall provide a
continuous graph or continuous chart
of the pressure as a function of time.
At not more than 7-day intervals, a
hard copy of the continuous graph or
chart shall be generated or the record
of the fan pressure shall be stored electronically. When records of fan pressure are stored electronically, the system used to store these records shall be
secure and not susceptible to alteration and shall be capable of storing
the required data. Records of the fan
pressure shall be retained at a surface
location at the mine for at least 1 year
and be made available for inspection by
authorized representatives of the Secretary and the representative of miners;
(5) Protected by one or more weak
walls or explosion doors, or a combination of weak walls and explosion doors,
located in direct line with possible explosive forces;
(6) Except as provided under paragraph (e) of this section, offset by at
least 15 feet from the nearest side of
the mine opening unless an alternative
method of protecting the fan and its
associated components is approved in
the ventilation plan.
(b)(1) If an electric motor is used to
drive a main mine fan, the motor shall
operate from a power circuit independent of all mine power circuits.
(2) If an internal combustion engine
is used to drive a main mine fan—
(i) The fuel supply shall be protected
against fires and explosions;
(ii) The engine shall be installed in
an incombustible housing and be
equipped with a remote shut-down device;
(iii) The engine and the engine exhaust system shall be located out of direct line of the air current exhausting
from the mine; and
(iv) The engine exhaust shall be vented to the atmosphere so that the exhaust gases do not contaminate the
mine intake air current or any enclosure.
(c) If a main mine fan monitoring
system is used under § 75.312, the system shall—
(1) Record, as described in paragraph
(a)(4) the mine ventilating pressure;
(2) Monitor bearing temperature, revolutions per minute, vibration, electric
voltage, and amperage;
(3) Provide a printout of the monitored parameters, including the mine
ventilating pressure within a reasonable period, not to exceed the end of
the next scheduled shift during which
miners are underground; and
(4) Be equipped with an automatic device that signals when—
(i) An electrical or mechanical deficiency exists in the monitoring system;
or
(ii) A sudden increase or loss in mine
ventilating pressure occurs.
(5) Provide monitoring, records,
printouts, and signals required by paragraphs (c)(1) through (c)(4) at a surface
location at the mine where a responsible person designated by the operator
is always on duty and where signals
from the monitoring system can be
seen or heard while anyone is underground. This person shall be provided
with two-way communication with the
working sections and work stations
where persons are routinely assigned to
work for the majority of a shift.
(d) Weak walls and explosion doors
shall have cross-sectional areas at
least equal to that of the entry through
which the pressure from an explosion
underground would be relieved. A weak
wall and explosion door combination
518
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00528
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.312
shall have a total cross-sectional area
at least equal to that of the entry
through which the pressure from an explosion underground would be relieved.
(e) If a mine fan is installed in line
with an entry, a slope, or a shaft—
(1) The cross-sectional area of the
pressure relief entry shall be at least
equal to that of the fan entry;
(2) The fan entry shall be developed
out of direct line with possible explosive forces;
(3) The coal or other solid material
between the pressure relief entry and
the fan entry shall be at least 2,500
square feet; and
(4) The surface opening of the pressure relief entry shall be not less than
15 feet nor more than 100 feet from the
surface opening of the fan entry and
from the underground intersection of
the fan entry and pressure relief entry.
(f) In mines ventilated by multiple
main mine fans, incombustible doors
shall be installed so that if any main
mine fan stops and air reversals
through the fan are possible, the doors
on the affected fan automatically
close.
(3) Electric power circuits entering
underground areas of the mine shall be
deenergized.
(c) When a back-up fan system is
used that does not provide the ventilating quantity provided by the main
mine fan, persons may be permitted in
the mine and electric power circuits
may be energized as specified in the approved ventilation plan.
(d) If an unusual variance in the mine
ventilation pressure is observed, or if
an electrical or mechanical deficiency
of a main mine fan is detected, the
mine foreman or equivalent mine official, or in the absence of the mine foreman or equivalent mine official, a designated certified person acting for the
mine foreman or equivalent mine official shall be notified immediately, and
appropriate action or repairs shall be
instituted promptly.
(e) While persons are underground, a
responsible person designated by the
operator shall always be at a surface
location where each main mine fan signal can be seen or heard.
(f) The area within 100 feet of main
mine fans and intake air openings shall
be kept free of combustible material,
unless alternative precautions necessary to provide protection from fire
or other products of combustion are approved in the ventilation plan.
(g) If multiple mine fans are used, the
mine ventilation system shall be designed and maintained to eliminate
areas without air movement.
(h) Any atmospheric monitoring system operated during fan stoppages
shall be intrinsically safe.
[61 FR 9829, Mar. 11, 1996, as amended at 61
FR 20877, May 8, 1996]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.311
Main mine fan operation.
(a) Main mine fans shall be continuously operated, except as otherwise approved in the ventilation plan, or when
intentionally stopped for testing of
automatic closing doors and automatic
fan signal devices, maintenance or adjustment of the fan, or to perform
maintenance or repair work underground that cannot otherwise be made
while the fan is operating.
(b) Except as provided in paragraph
(c) of this section, when a main mine
fan is intentionally stopped and the
ventilating quantity provided by the
fan is not maintained by a back-up fan
system—
(1) Only persons necessary to evaluate the effect of the fan stoppage or restart, or to perform maintenance or repair work that cannot otherwise be
made while the fan is operating, shall
be permitted underground;
(2) Mechanized equipment shall be
shut off before stopping the fan; and
§ 75.312 Main mine fan examinations
and records.
(a) To assure electrical and mechanical reliability of main mine fans, each
main mine fan and its associated components, including devices for measuring or recording mine ventilation
pressure, shall be examined for proper
operation by a trained person designated by the operator. Examinations
of main mine fans shall be made at
least once each day that the fan operates, unless a fan monitoring system is
used. No examination is required on
519
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00529
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.312
30 CFR Ch. I (7–1–19 Edition)
any day when no one, including certified persons, goes underground, except that an examination shall be completed prior to anyone entering the
mine.
(b)(1) If a main mine fan monitoring
system is used, a trained person designated by the operator shall—
(i) At least once each day review the
data provided by the fan monitoring
system to assure that the fan and the
fan monitoring system are operating
properly. No review is required on any
day when no one, including certified
persons, goes underground, except that
a review of the data shall be performed
prior to anyone entering the underground portion of the mine. Data reviewed should include the fan pressure,
bearing temperature, revolutions per
minute, vibration, electric voltage, and
amperage; and
(ii) At least every 7 days—
(A) Test the monitoring system for
proper operation; and
(B) Examine each main mine fan and
its associated components to assure
electrical and mechanical reliability of
main mine fans.
(2) If the monitoring system malfunctions, the malfunction shall be corrected, or paragraph (a) of this section
shall apply.
(c) At least every 31 days, the automatic fan signal device for each main
mine fan shall be tested by stopping
the fan. Only persons necessary to
evaluate the effect of the fan stoppage
or restart, or to perform maintenance
or repair work that cannot otherwise
be made while the fan is operating,
shall be permitted underground. Notwithstanding
the
requirement
of
§ 75.311(b)(3), underground power may
remain energized during this test provided no one, including persons identified in § 75.311(b)(1), is underground. If
the fan is not restarted within 15 minutes, underground power shall be deenergized and no one shall enter any underground area of the mine until the
fan is restarted and an examination of
the mine is conducted as described in
§ 75.360 (b) through (e) and the mine has
been determined to be safe.
(d) At least every 31 days, the automatic closing doors in multiple main
mine fan systems shall be tested by
stopping the fan. Only persons nec-
essary to evaluate the effect of the fan
stoppage or restart, or to perform
maintenance or repair work that cannot otherwise be made while the fan is
operating, shall be permitted underground. Notwithstanding the provisions of § 75.311, underground power
may remain energized during this test
provided no one, including persons
identified in § 75.311(b)(1), is underground. If the fan is not restarted within 15 minutes, underground power shall
be deenergized and no one shall enter
any underground area of the mine,
until the fan is restarted and an examination of the mine is conducted as described in § 75.360 (b) through (e) and
the mine has been determined to be
safe.
(e) Circular main mine fan pressure
recording charts shall be changed before the beginning of a second revolution.
(f)(1) Certification. Persons making
main mine fan examinations shall certify by initials and date at the fan or
another location specified by the operator that the examinations were made.
Each certification shall identify the
main mine fan examined.
(2) Persons reviewing data produced
by a main mine fan monitoring system
shall certify by initials and date on a
printed copy of the data from the system that the review was completed. In
lieu of certification on a copy of the
data, the person reviewing the data
may certify electronically that the review was completed. Electronic certification shall be by handwritten initials
and date in a computer system so as to
be secure and not susceptible to alteration.
(g)(1) Recordkeeping. By the end of the
shift on which the examination is
made, persons making main mine fan
examinations shall record all uncorrected defects that may affect the operation of the fan that are not corrected by the end of that shift. Records
shall be maintained in a secure book
that is not susceptible to alteration or
electronically in a computer system so
as to be secure and not susceptible to
alteration.
(2) When a fan monitoring system is
used in lieu of the daily fan examination—
520
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00530
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.313
(i) The certified copies of data produced by fan monitoring systems shall
be maintained separate from other
computer-generated reports or data;
and
(ii) A record shall be made of any fan
monitoring system malfunctions, electrical or mechanical deficiencies in the
monitoring system and any sudden increase or loss in mine ventilating pressure. The record shall be made by the
end of the shift on which the review of
the data is completed and shall be
maintained in a secure book that is not
susceptible to alteration or electronically in a computer system so as to be
secure and not susceptible to alteration.
(3) By the end of the shift on which
the monthly test of the automatic fan
signal device or the automatic closing
doors is completed, persons making
these tests shall record the results of
the tests. Records shall be maintained
in a secure book that is not susceptible
to alteration or electronically in a
computer system so as to be secure and
not susceptible to alteration.
(h) Retention period. Records, including records of mine fan pressure and
the certified copies of data produced by
fan monitoring systems, shall be retained at a surface location at the
mine for at least 1 year and shall be
made available for inspection by authorized representatives of the Secretary and the representative of miners.
methane in the working places and in
other areas where methane is likely to
accumulate before work is resumed and
before equipment is energized or restarted in these areas.
(c) If ventilation is not restored within 15 minutes after a main mine fan
stops—
(1) Everyone shall be withdrawn from
the mine;
(2) Underground electric power circuits shall be deenergized. However,
circuits necessary to withdraw persons
from the mine need not be deenergized
if located in areas or haulageways
where methane is not likely to migrate
to or accumulate. These circuits shall
be deenergized as persons are withdrawn; and
(3) Mechanized equipment not located on working sections shall be shut
off. However, mechanized equipment
necessary to withdraw persons from
the mine need not be shut off if located
in areas where methane is not likely to
migrate to or accumulate.
(d)(1) When ventilation is restored—
(i) No one other than designated certified examiners shall enter any underground area of the mine until an examination is conducted as described in
§ 75.360(b) through (e) and the area has
been determined to be safe. Designated
certified examiners shall enter the underground area of the mine from which
miners have been withdrawn only after
the fan has operated for at least 15
minutes unless a longer period of time
is specified in the approved ventilation
plan.
(ii) Underground power circuits shall
not be energized and nonpermissible
mechanized equipment shall not be
started or operated in an area until an
examination is conducted as described
in § 75.360(b) through (e) and the area
has been determined to be safe, except
that designated certified examiners
may use nonpermissible transportation
equipment in intake airways to facilitate the making of the required examination.
(2) If ventilation is restored to the
mine before miners reach the surface,
the miners may return to underground
working areas only after an examination of the areas is made by a certified
person and the areas are determined to
be safe.
§ 75.313 Main mine fan stoppage with
persons underground.
(a) If a main mine fan stops while
anyone is underground and the ventilating quantity provided by the fan is
not maintained by a back-up fan system—
(1) Electrically powered equipment in
each working section shall be deenergized;
(2) Other mechanized equipment in
each working section shall be shut off;
and
(3) Everyone shall be withdrawn from
the working sections and areas where
mechanized mining equipment is being
installed or removed.
(b) If ventilation is restored within 15
minutes after a main mine fan stops,
certified persons shall examine for
521
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00531
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.320
30 CFR Ch. I (7–1–19 Edition)
(e) Any atmospheric monitoring system operated during fan stoppages
shall be intrinsically safe.
(f) Any electrical refuge alternative
components exposed to the mine atmosphere shall be approved as intrinsically safe for use during fan stoppages.
Any electrical refuge alternative components located inside the refuge alternative shall be either approved as intrinsically safe or approved as permissible for use during fan stoppages.
[61 FR 9829, Mar. 11, 1996, as amended at 73
FR 80697, Dec. 31, 2008]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.320 Air quality detectors and
measurement devices.
(a) Tests for methane shall be made
by a qualified person with MSHA approved detectors that are maintained
in permissible and proper operating
condition and calibrated with a known
methane-air mixture at least once
every 31 days.
(b) Tests for oxygen deficiency shall
be made by a qualified person with
MSHA approved oxygen detectors that
are maintained in permissible and
proper operating condition and that
can detect 19.5 percent oxygen with an
accuracy of ±0.5 percent. The oxygen
detectors shall be calibrated at the
start of each shift that the detectors
will be used.
(c) Handheld devices that contain
electrical components and that are
used for measuring air velocity, carbon
monoxide, oxides of nitrogen, and other
gases shall be approved and maintained
in permissible and proper operating
condition.
(d) An oxygen detector approved by
MSHA shall be used to make tests for
oxygen deficiency required by the regulations in this part. Permissible flame
safety lamps may only be used as a
supplementary testing device.
(e) Maintenance of instruments required by paragraphs (a) through (d) of
this section shall be done by persons
trained in such maintenance.
§ 75.321 Air quality.
(a)(1) The air in areas where persons
work or travel, except as specified in
paragraph (a)(2) of this section, shall
contain at least 19.5 percent oxygen
and not more than 0.5 percent carbon
dioxide, and the volume and velocity of
the air current in these areas shall be
sufficient to dilute, render harmless,
and carry away flammable, explosive,
noxious, and harmful gases, dusts,
smoke, and fumes.
(2) The air in areas of bleeder entries
and worked-out areas where persons
work or travel shall contain at least
19.5 percent oxygen, and carbon dioxide
levels shall not exceed 0.5 percent time
weighted average and 3.0 percent short
term exposure limit.
(b) Notwithstanding the provisions of
§ 75.322, for the purpose of preventing
explosions from gases other than methane, the following gases shall not be
permitted to accumulate in excess of
the concentrations listed below:
(1) Carbon monoxide (CO)—2.5 percent
(2) Hydrogen (H2)—.80 percent
(3) Hydrogen sulfide (H2 S)—.80 percent
(4) Acetylene (C2 H2)—.40 percent
(5) Propane (C3 H8)—.40 percent
(6)
MAPP
(methyl-acetylene-propylene-propodiene)—.30 percent
§ 75.322 Harmful quantities of noxious
gases.
Concentrations of noxious or poisonous gases, other than carbon dioxide, shall not exceed the threshold
limit values (TLV) as specified and applied by the American Conference of
Governmental Industrial Hygienists in
‘‘Threshold Limit Values for Substance
in Workroom Air’’ (1972). Detectors or
laboratory analysis of mine air samples
shall be used to determine the concentrations of harmful, noxious, or poisonous gases. This incorporation by
reference has been approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. Copies are available from
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at every MSHA Coal Mine
Safety and Health District Office. The
material is available for examination
at the National Archives and Records
Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go
to:
http://www.archives.gov/
federallregister/
522
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00532
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
codeloflfederallregulations/
ibrllocations.html.
kpayne on VMOFRWIN702 with $$_JOB
[80 FR 52991, Sept. 2, 2015]
§ 75.323 Actions for excessive methane.
(a) Location of tests. Tests for methane concentrations under this section
shall be made at least 12 inches from
the roof, face, ribs, and floor.
(b) Working places and intake air
courses. (1) When 1.0 percent or more
methane is present in a working place
or an intake air course, including an
air course in which a belt conveyor is
located, or in an area where mechanized mining equipment is being installed or removed—
(i) Except intrinsically safe atmospheric monitoring systems (AMS),
electrically powered equipment in the
affected area shall be deenergized, and
other mechanized equipment shall be
shut off;
(ii) Changes or adjustments shall be
made at once to the ventilation system
to reduce the concentration of methane
to less than 1.0 percent; and
(iii) No other work shall be permitted
in the affected area until the methane
concentration is less than 1.0 percent.
(2) When 1.5 percent or more methane
is present in a working place or an intake air course, including an air course
in which a belt conveyor is located, or
in an area where mechanized mining
equipment is being installed or removed—
(i) Everyone except those persons referred to in § 104(c) of the Act shall be
withdrawn from the affected area; and
(ii) Except for intrinsically safe
AMS, electrically powered equipment
in the affected area shall be disconnected at the power source.
(c) Return air split. (1) When 1.0 percent or more methane is present in a
return air split between the last working place on a working section and
where that split of air meets another
split of air, or the location at which
the split is used to ventilate seals or
worked-out areas changes or adjustments shall be made at once to the
ventilation system to reduce the concentration of methane in the return air
to less than 1.0 percent.
(2) When 1.5 percent or more methane
is present in a return air split between
the last working place on a working
§ 75.323
section and where that split of air
meets another split of air, or the location where the split is used to ventilate
seals or worked-out areas—
(i) Everyone except those persons referred to in § 104(c) of the Act shall be
withdrawn from the affected area;
(ii) Other than intrinsically safe
AMS, equipment in the affected area
shall be deenergized, electric power
shall be disconnected at the power
source, and other mechanized equipment shall be shut off; and
(iii) No other work shall be permitted
in the affected area until the methane
concentration in the return air is less
than 1.0 percent.
(d) Return air split alternative. (1) The
provisions of this paragraph apply if—
(i) The quantity of air in the split
ventilating the active workings is at
least 27,000 cubic feet per minute in the
last open crosscut or the quantity specified in the approved ventilation plan,
whichever is greater;
(ii) The methane content of the air in
the split is continuously monitored
during mining operations by an AMS
that gives a visual and audible signal
on the working section when the methane in the return air reaches 1.5 percent, and the methane content is monitored as specified in § 75.351; and
(iii) Rock dust is continuously applied with a mechanical duster to the
return air course during coal production at a location in the air course immediately outby the most inby monitoring point.
(2) When 1.5 percent or more methane
is present in a return air split between
a point in the return opposite the section loading point and where that split
of air meets another split of air or
where the split of air is used to ventilate seals or worked-out areas—
(i) Changes or adjustments shall be
made at once to the ventilation system
to reduce the concentration of methane
in the return air below 1.5 percent;
(ii) Everyone except those persons referred to in § 104(c) of the Act shall be
withdrawn from the affected area;
(iii) Except for intrinsically safe
AMS, equipment in the affected area
shall be deenergized, electric power
shall be disconnected at the power
source, and other mechanized equipment shall be shut off; and
523
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00533
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.324
30 CFR Ch. I (7–1–19 Edition)
(iv) No other work shall be permitted
in the affected area until the methane
concentration in the return air is less
than 1.5 percent.
(e) Bleeders and other return air
courses. The concentration of methane
in a bleeder split of air immediately
before the air in the split joins another
split of air, or in a return air course
other than as described in paragraphs
(c) and (d) of this section, shall not exceed 2.0 percent.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.324 Intentional changes in the
ventilation system.
(a) A person designated by the operator shall supervise any intentional
change in ventilation that—
(1) Alters the main air current or any
split of the main air current in a manner that could materially affect the
safety or health of persons in the mine;
or
(2) Affects section ventilation by
9,000 cubic feet per minute of air or
more in bituminous or lignite mines, or
5,000 cubic feet per minute of air or
more in anthracite mines.
(b) Intentional changes shall be made
only under the following conditions:
(1) Electric power shall be removed
from areas affected by the ventilation
change and mechanized equipment in
those areas shall be shut off before the
ventilation change begins.
(2) Only persons making the change
in ventilation shall be in the mine.
(3) Electric power shall not be restored to the areas affected by the ventilation change and mechanized equipment shall not be restarted until a certified person has examined these areas
for methane accumulation and for oxygen deficiency and has determined that
the areas are safe.
§ 75.325 Air quantity.
(a)(1) In bituminous and lignite
mines the quantity of air shall be at
least 3,000 cubic feet per minute reaching each working face where coal is
being cut, mined, drilled for blasting,
or loaded. When a greater quantity is
necessary to dilute, render harmless,
and carry away flammable, explosive,
noxious, and harmful gases, dusts,
smoke, and fumes, this quantity shall
be specified in the approved ventilation
plan. A minimum air quantity may be
required to be specified in the approved
ventilation plan for other working
places or working faces.
(2) The quantity of air reaching the
working face shall be determined at or
near the face end of the line curtain,
ventilation tubing, or other ventilation
control device. If the curtain, tubing,
or device extends beyond the last row
of permanent roof supports, the quantity of air reaching the working face
shall be determined behind the line
curtain or in the ventilation tubing at
or near the last row of permanent supports. When machine-mounted dust
collectors are used in conjunction with
blowing face ventilation systems, the
quantity of air reaching the working
face shall be determined with the dust
collector turned off.
(3) If machine mounted dust collectors or diffuser fans are used, the approved ventilation plan shall specify
the operating volume of the dust collector or diffuser fan.
(b) In bituminous and lignite mines,
the quantity of air reaching the last
open crosscut of each set of entries or
rooms on each working section and the
quantity of air reaching the intake end
of a pillar line shall be at least 9,000
cubic feet per minute unless a greater
quantity is required to be specified in
the approved ventilation plan. This
minimum also applies to sections
which are not operating but are capable of producing coal by simply energizing the equipment on the section.
(c) In longwall and shortwall mining
systems—
(1) The quantity of air shall be at
least 30,000 cubic feet per minute reaching the working face of each longwall,
unless the operator demonstrates that
a lesser air quantity will maintain continual compliance with applicable
methane and respirable dust standards.
This lesser quantity shall be specified
in the approved ventilation plan. A
quantity greater than 30,000 cubic feet
per minute may be required to be specified in the approved ventilation plan.
(2) The velocity of air that will be
provided to control methane and respirable dust in accordance with applicable standards on each longwall or
shortwall and the locations where
these velocities will be provided shall
be specified in the approved ventilation
524
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00534
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.325
plan. The locations specified shall be at
least 50 feet but no more than 100 feet
from the headgate and tailgate, respectively.
(d) Ventilation shall be maintained
during installation and removal of
mechanized mining equipment. The approved ventilation plan shall specify
the minimum quantity of air, the locations where this quantity will be provided and the ventilation controls required.
(e) In anthracite mines, the quantity
of air shall be as follows:
(1) At least 1,500 cubic feet per
minute reaching each working face
where coal is being mined, unless a
greater quantity is required to be specified in the approved ventilation plan.
(2) At least 5,000 cubic feet per
minute passing through the last open
crosscut in each set of entries or rooms
and at the intake end of any pillar line,
unless a greater quantity is required to
be specified in the approved ventilation
plan.
(3) When robbing areas where air currents cannot be controlled and air
measurements cannot be obtained, the
air shall have perceptible movement.
(f) The minimum ventilating air
quantity for an individual unit of diesel-powered equipment being operated
shall be at least that specified on the
approval plate for that equipment.
Such air quantity shall be maintained—
(1) In any working place where the
equipment is being operated;
(2) At the section loading point during any shift the equipment is being
operated on the working section;
(3) In any entry where the equipment
is being operated outby the section
loading point in areas of the mine developed on or after April 25, 1997;
(4) In any air course with single or
multiple entries where the equipment
is being operated outby the section
loading point in areas of the mine developed prior to April 25, 1997; and
(5) At any other location required by
the district manager and specified in
the approved ventilation plan.
(g) The minimum ventilating air
quantity where multiple units of diesel-powered equipment are operated on
working sections and in areas where
mechanized mining equipment is being
installed or removed must be at least
the sum of that specified on the approval plates of all the diesel-powered
equipment on the working section or in
the area where mechanized mining
equipment is being installed or removed. The minimum ventilating air
quantity shall be specified in the approved ventilation plan. For working
sections such air quantity must be
maintained—
(1) In the last open crosscut of each
set of entries or rooms in each working
section;
(2) In the intake, reaching the working face of each longwall; and
(3) At the intake end of any pillar
line.
(h) The following equipment may be
excluded from the calculations of ventilating air quantity under paragraph
(g) if such equipment exclusion is approved by the district manager and
specified in the ventilation plan:
(1) Self-propelled equipment meeting
the requirements of § 75.1908(b);
(2) Equipment that discharges its exhaust into intake air that is coursed
directly to a return air course;
(3) Equipment that discharges its exhaust directly into a return air course;
and
(4) Other equipment having duty cycles such that the emissions would not
significantly affect the exposure of
miners.
(i) A ventilating air quantity that is
less than what is required by paragraph
(g) of this section may be approved by
the district manager in the ventilation
plan based upon the results of sampling
that demonstrate that the lesser air
quantity will maintain continuous
compliance with applicable TLV ®’s.
(j) If during sampling required by
§ 70.1900(c) of this subchapter the ventilating air is found to contain concentrations of CO or NO2 in excess of
the action level specified by § 70.1900(c),
higher action levels may be approved
by the district manager based on the
results of sampling that demonstrate
that a higher action level will maintain continuous compliance with applicable TLV ®’s. Action levels other than
those specified in § 70.1900(c) shall be
specified in the approved ventilation
plan.
525
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00535
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.326
30 CFR Ch. I (7–1–19 Edition)
(k) As of November 25, 1997 the ventilating air quantity required where
diesel-powered equipment is operated
shall meet the requirements of paragraphs (f) through (j) of this section.
Mine operators utilizing diesel-powered
equipment in underground coal mines
shall submit to the appropriate MSHA
district manager a revised ventilation
plan or appropriate amendments to the
existing plan, in accordance with
§ 75.371, which implement the requirements of paragraphs (f) through (j) of
this section.
[61 FR 9828, Mar. 11, 1996; 61 FR 26442, May 28,
1996; 61 FR 29288, June 10, 1996, as amended at
61 FR 55526, Oct. 25, 1996; 62 FR 34641, June 27,
1997; 79 FR 24987, May 1, 2014]
§ 75.326 Mean entry air velocity.
In exhausting face ventilation systems, the mean entry air velocity shall
be at least 60 feet per minute reaching
each working face where coal is being
cut, mined, drilled for blasting, or loaded, and to any other working places as
required in the approved ventilation
plan. A lower mean entry air velocity
may be approved in the ventilation
plan if the lower velocity will maintain
methane and respirable dust concentrations in accordance with the applicable
levels. Mean entry air velocity shall be
determined at or near the inby end of
the line curtain, ventilation tubing, or
other face ventilation control devices.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 9828, Mar. 11, 1996; 61 FR 29288, June
10, 1996]
§ 75.327 Air courses and trolley haulage systems.
(a) In any mine opened on or after
March 30, 1970, or in any new working
section of a mine opened before that
date, where trolley haulage systems
are maintained and where trolley wires
or trolley feeder wires are installed, an
authorized representative of the Secretary shall require enough entries or
rooms as intake air courses to limit
the velocity of air currents in the
haulageways to minimize the hazards
of fires and dust explosions in the
haulageways.
(b) Unless the district manager approves a higher velocity, the velocity
of the air current in the trolley haulage entries shall be limited to not more
than 250 feet per minute. A higher air
velocity may be required to limit the
methane content in these haulage entries or elsewhere in the mine to less
than 1.0 percent and provide an adequate supply of oxygen.
§ 75.330 Face ventilation control devices.
(a) Brattice cloth, ventilation tubing
and other face ventilation control devices shall be made of flame-resistant
material approved by MSHA.
(b)(1) Ventilation control devices
shall be used to provide ventilation to
dilute, render harmless, and to carry
away flammable, explosive, noxious,
and harmful gases, dusts, smoke, and
fumes—
(i) To each working face from which
coal is being cut, mined, drilled for
blasting, or loaded; and
(ii) To any other working places as
required by the approved ventilation
plan.
(2) These devices shall be installed at
a distance no greater than 10 feet from
the area of deepest penetration to
which any portion of the face has been
advanced unless an alternative distance is specified and approved in the
ventilation plan. Alternative distances
specified shall be capable of maintaining concentrations of respirable dust,
methane, and other harmful gases, in
accordance with the levels specified in
the applicable sections of this chapter.
(c) When the line brattice or any
other face ventilation control device is
damaged to an extent that ventilation
of the working face is inadequate, production activities in the working place
shall cease until necessary repairs are
made and adequate ventilation is restored.
[61 FR 9828, Mar. 11, 1996; 61 FR 29288, June
10, 1996]
§ 75.331
Auxiliary fans and tubing.
(a) When auxiliary fans and tubing
are used for face ventilation, each auxiliary fan shall be—
(1) Permissible, if the fan is electrically operated;
(2) Maintained in proper operating
condition;
(3) Deenergized or shut off when no
one is present on the working section;
and
526
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00536
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.333
(4) Located and operated to avoid recirculation of air.
(b) If a deficiency exists in any auxiliary fan system, the deficiency shall be
corrected or the auxiliary fan shall be
deenergized immediately.
(c) If the air passing through an auxiliary fan or tubing contains 1.0 percent or more methane, power to electrical equipment in the working place
and to the auxiliary fan shall be deenergized, and other mechanized equipment in the working place shall be
shut off until the methane concentration is reduced to less than 1.0 percent.
(d) When an auxiliary fan is
stopped—
(1) Line brattice or other face ventilation control devices shall be used to
maintain ventilation to affected faces;
and
(2) Electrical equipment in the affected working places shall be disconnected at the power source, and other
mechanized equipment shall be shut off
until ventilation to the working place
is restored.
(2) Air that has passed by any opening of any unsealed area that is not examined under §§ 75.360, 75.361 or 75.364 of
this subpart, shall not be used to ventilate any working place.
§ 75.332 Working sections and working
places.
(a)(1) Each working section and each
area where mechanized mining equipment is being installed or removed,
shall be ventilated by a separate split
of intake air directed by overcasts,
undercasts or other permanent ventilation controls.
(2) When two or more sets of mining
equipment are simultaneously engaged
in cutting, mining, or loading coal or
rock from working places within the
same working section, each set of mining equipment shall be on a separate
split of intake air.
(3) For purposes of this section, a set
of mining equipment includes a single
loading machine, a single continuous
mining machine, or a single longwall
or shortwall mining machine.
(b)(1) Air that has passed through
any area that is not examined under
§§ 75.360, 75.361 or 75.364 of this subpart,
or through an area where second mining has been done shall not be used to
ventilate any working place. Second
mining is intentional retreat mining
where pillars have been wholly or partially removed, regardless of the
amount of recovery obtained.
§ 75.333
Ventilation controls.
(a) For purposes of this section,
‘‘doors’’ include any door frames.
(b) Permanent stoppings or other permanent ventilation control devices
constructed after November 15, 1992,
shall be built and maintained—
(1) Between intake and return air
courses, except temporary controls
may be used in rooms that are 600 feet
or less from the centerline of the entry
from which the room was developed including where continuous face haulage
systems are used in such rooms. Unless
otherwise approved in the ventilation
plan, these stoppings or controls shall
be maintained to and including the
third connecting crosscut outby the
working face;
(2) To separate belt conveyor
haulageways from return air courses,
except where belt entries in areas of
mines developed before March 30, 1970,
are used as return air courses;
(3) To separate belt conveyor
haulageways from intake air courses
when the air in the intake air courses
is used to provide air to active working
places. Temporary ventilation controls
may be used in rooms that are 600 feet
or less from the centerline of the entry
from which the rooms were developed
including where continuous face haulage systems are used in such rooms.
When continuous face haulage systems
are used, permanent stoppings or other
permanent ventilation control devices
shall be built and maintained to the
outby most point of travel of the dolly
or 600 feet from the point of deepest
penetration in the conveyor belt entry,
whichever distance is closer to the
point of deepest penetration, to separate the continuous haulage entry from
the intake entries;
(4)
To
separate
the
primary
escapeway from belt and trolley haulage entries, as required by § 75.380(g).
For the purposes of § 75.380(g), the loading point for a continuous haulage system shall be the outby most point of
travel of the dolly or 600 feet from the
527
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00537
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.333
30 CFR Ch. I (7–1–19 Edition)
point of deepest penetration, whichever
distance is less; and
(5) In return air courses to direct air
into adjacent worked-out areas.
(c) Personnel doors shall be constructed of noncombustible material
and shall be of sufficient strength to
serve their intended purpose of maintaining separation and permitting
travel between air courses, and shall be
installed as follows in permanent
stoppings constructed after November
15, 1992:
(1) The distance between personnel
doors shall be no more than 300 feet in
seam heights below 48 inches and 600
feet in seam heights 48 inches or higher.
(2) The location of all personnel doors
in stoppings along escapeways shall be
clearly marked so that the doors may
be easily identified by anyone traveling in the escapeway and in the entries on either side of the doors.
(3) When not in use, personnel doors
shall be closed.
(4) An airlock shall be established
where the air pressure differential between air courses creates a static force
exceeding 125 pounds on closed personnel doors along escapeways.
(d) Doors, other than personnel
doors, constructed after November 15,
1992, that are used in lieu of permanent
stoppings or to control ventilation
within an air course shall be:
(1) Made of noncombustible material
or coated on all accessible surfaces
with flame-retardant materials having
a flame-spread index of 25 or less, as
tested under ASTM E162–87, ‘‘Standard
Test Method for Surface Flammability
of Materials Using a Radiant Heat Energy Source.’’ This publication is incorporated by reference and may be inspected at any MSHA Coal Mine Safety
and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorporation by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
(2) Of sufficient strength to serve
their intended purpose of maintaining
separation and permitting travel between or within air courses or entries.
(3) Installed in pairs to form an airlock. When an airlock is used, one side
of the airlock shall remain closed.
When not in use, both sides shall be
closed.
(e)(1)(i) Except as provided in paragraphs (e)(2), (3), and (4) of this section,
all overcasts, undercasts, shaft partitions, permanent stoppings, and regulators, installed after June 10, 1996,
shall be constructed in a traditionally
accepted method and of materials that
have been demonstrated to perform
adequately or in a method and of materials that have been tested and shown
to have a minimum strength equal to
or greater than the traditionally accepted in-mine controls. Tests may be
performed
under
ASTM
E72–80,
‘‘Standard Methods of Conducting
Strength Tests of Panels for Building
Construction’’ (Section 12–Transverse
Load–Specimen Vertical, load, only),
or the operator may conduct comparative in-mine tests. In-mine tests shall
be designed to demonstrate the comparative strength of the proposed construction and a traditionally accepted
in-mine
control.
The
publication
ASTM E72–80, ‘‘Standard Methods of
Conducting Strength Tests of Panels
for Building Construction,’’ is incorporated by reference and may be inspected at any MSHA Coal Mine Safety
and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
528
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00538
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.333
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorporation by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
(ii) All overcasts, undercasts, shaft
partitions, permanent stoppings, and
regulators, installed after November 15,
1992, shall be constructed of noncombustible material. Materials that
are suitable for the construction of
overcasts, undercasts, shaft partitions,
permanent stoppings, and regulators
include concrete, concrete block, brick,
cinder block, tile, or steel. No ventilation controls installed after November
15, 1992, shall be constructed of aluminum.
(2) In anthracite mines, permanent
stoppings may be constructed of overlapping layers of hardwood mine
boards, if the stoppings are a minimum
2 inches thick.
(3) When timbers are used to create
permanent stoppings in heaving or caving areas, the stoppings shall be coated
on all accessible surfaces with a flameretardant material having a flamespread index of 25 or less, as tested
under ASTM E162–87, ‘‘Standard Test
Method for Surface Flammability of
Materials Using a Radiant Heat Energy
Source.’’ This publication is incorporated by reference and may be inspected at any MSHA Coal Mine Safety
and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorpo-
ration by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
(4) In anthracite mines, doors and
regulators may be constructed of overlapping layers of hardwood boards, if
the doors, door frames, and regulators
are a minimum 2 inches thick.
(f) When sealants are applied to ventilation controls, the sealant shall
have a flame-spread index of 25 or less
under ASTM E162–87, ‘‘Standard Test
Method for Surface Flammability of
Materials Using a Radiant Heat Energy
Source.’’ This publication is incorporated by reference and may be inspected at any MSHA Coal Mine Safety
and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials (ASTM), 100 Barr Harbor
Drive,
P.O.
Box
C700,
West
Conshohocken, PA 19428–2959; 610–832–
9500; http://www.astm.org. This incorporation by reference was approved by
the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1
CFR part 51.
(g) Before mining is discontinued in
an entry or room that is advanced
more than 20 feet from the inby rib, a
crosscut shall be made or line brattice
shall be installed and maintained to
provide adequate ventilation. When
conditions such as methane liberation
warrant a distance less than 20 feet,
the approved ventilation plan shall
specify the location of such rooms or
entries and the maximum distance
they will be developed before a crosscut is made or line brattice is installed.
529
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00539
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.334
30 CFR Ch. I (7–1–19 Edition)
(h) All ventilation controls, including
seals, shall be maintained to serve the
purpose for which they were built.
[61 FR 9829, Mar. 11, 1996; 61 FR 20877, May 8,
1996; 61 FR 26442, May 28, 1996; 61 FR 29288,
29289, June 10, 1996, as amended at 67 FR
38386, June 4, 2002; 71 FR 16668, Apr. 3, 2006; 73
FR 80612, Dec. 31, 2008; 80 FR 52991, Sept. 2,
2015]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.334 Worked-out areas and areas
where pillars are being recovered.
(a) Worked-out areas where no pillars
have been recovered shall be—
(1) Ventilated so that methane-air
mixtures and other gases, dusts, and
fumes from throughout the worked-out
areas are continuously diluted and
routed into a return air course or to
the surface of the mine; or
(2) Sealed.
(b)(1) During pillar recovery a bleeder
system shall be used to control the air
passing through the area and to continuously dilute and move methane-air
mixtures and other gases, dusts, and
fumes from the worked-out area away
from active workings and into a return
air course or to the surface of the
mine.
(2) After pillar recovery a bleeder
system shall be maintained to provide
ventilation to the worked-out area, or
the area shall be sealed.
(c) The approved ventilation plan
shall specify the following:
(1) The design and use of bleeder systems;
(2) The means to determine the effectiveness of bleeder systems;
(3) The means for adequately maintaining bleeder entries free of obstructions such as roof falls and standing
water; and
(4) The location of ventilating devices such as regulators, stoppings and
bleeder connectors used to control air
movement through the worked-out
area.
(d) If the bleeder system used does
not continuously dilute and move
methane-air mixtures and other gases,
dusts, and fumes away from workedout areas into a return air course or to
the surface of the mine, or it cannot be
determined by examinations or evaluations under § 75.364 that the bleeder system is working effectively, the workedout area shall be sealed.
(e) Each mining system shall be designed so that each worked-out area
can be sealed. The approved ventilation
plan shall specify the location and the
sequence of construction of proposed
seals.
(f) In place of the requirements of
paragraphs (a) and (b) of this section,
for mines with a demonstrated history
of spontaneous combustion, or that are
located in a coal seam determined to
be susceptible to spontaneous combustion, the approved ventilation plan
shall specify the following:
(1) Measures to detect methane, carbon monoxide, and oxygen concentrations during and after pillar recovery,
and in worked-out areas where no pillars have been recovered, to determine
if the areas must be ventilated or
sealed.
(2) Actions that will be taken to protect miners from the hazards of spontaneous combustion.
(3) If a bleeder system will not be
used, the methods that will be used to
control spontaneous combustion, accumulations of methane-air mixtures,
and other gases, dusts, and fumes in
the worked-out area.
§ 75.335 Seal strengths, design applications, and installation.
(a) Seal strengths. Seals constructed
on or after October 20, 2008 shall be designed, constructed, and maintained to
withstand—
(1)(i) At least 50-psi overpressure
when the atmosphere in the sealed area
is monitored and maintained inert and
designed using a pressure-time curve
with an instantaneous overpressure of
at least 50 psi. A minimum overpressure of at least 50 psi shall be
maintained for at least four seconds
then released instantaneously.
(ii) Seals constructed to separate the
active
longwall
panel
from
the
longwall panel previously mined shall
be designed using a pressure-time curve
with a rate of pressure rise of at least
50 psi in 0.1 second. A minimum overpressure of at least 50 psi shall be
maintained; or
(2)(i) Overpressures of at least 120 psi
if the atmosphere in the sealed area is
not monitored, is not maintained inert,
the conditions in paragraphs (a)(3)(i)
through (iii) of this section are not
530
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00540
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.335
present, and the seal is designed using
a pressure-time curve with an instantaneous overpressure of at least 120 psi. A
minimum overpressure of 120 psi shall
be maintained for at least four seconds
then released instantaneously.
(ii) Seals constructed to separate the
active
longwall
panel
from
the
longwall panel previously mined shall
be designed using a pressure-time curve
with a rate of pressure rise of 120 psi in
0.25 second. A minimum overpressure
of 120 psi shall be maintained; or
(3) Overpressures greater than 120 psi
if the atmosphere in the sealed area is
not monitored and is not maintained
inert, and
(i) The atmosphere in the sealed area
is likely to contain homogeneous mixtures of methane between 4.5 percent
and 17.0 percent and oxygen exceeding
17.0 percent throughout the entire
area;
(ii) Pressure piling could result in
overpressures greater than 120 psi in
the area to be sealed; or
(iii) Other conditions are encountered, such as the likelihood of a detonation in the area to be sealed.
(iv) Where the conditions in paragraphs (a)(3)(i), (ii), or (iii) of this section are encountered, the mine operator shall revise the ventilation plan to
address the potential hazards. The plan
shall include seal strengths sufficient
to address such conditions.
(b) Seal design applications. Seal design applications from seal manufacturers or mine operators shall be in accordance with paragraph (b)(1) or (2) of
this section and submitted for approval
to MSHA’s Office of Technical Support,
Pittsburgh Safety and Health Technology Center, 626 Cochrans Mill Road,
Building 151, Pittsburgh, PA 15236–3611.
(1) An engineering design application
shall—
(i) Address gas sampling pipes, water
drainage systems, methods to reduce
air leakage, pressure-time curve, fire
resistance
characteristics,
flame
spread index, entry size, engineering
design and analysis, elasticity of design, material properties, construction
specifications, quality control, design
references, and other information related to seal construction;
(ii) Be certified by a professional engineer that the design of the seal is in
accordance with current, prudent engineering practices and is applicable to
conditions in an underground coal
mine; and
(iii) Include a summary of the installation procedures related to seal construction; or
(2) Each application based on fullscale explosion tests or equivalent
means of physical testing shall address
the following requirements to ensure
that a seal can reliably meet the seal
strength requirements:
(i) Certification by a professional engineer that the testing was done in accordance with current, prudent engineering practices for construction in a
coal mine;
(ii) Technical information related to
the methods and materials;
(iii) Supporting documentation;
(iv) An engineering analysis to address differences between the seal support during test conditions and the
range of conditions in a coal mine; and
(v) A summary of the installation
procedures related to seal construction.
(3) MSHA will notify the applicant if
additional information or testing is required. The applicant shall provide this
information, arrange any additional or
repeat tests, and provide prior notification to MSHA of the location, date, and
time of such test(s).
(4) MSHA will notify the applicant,
in writing, whether the design is approved or denied. If the design is denied, MSHA will specify, in writing,
the deficiencies of the application, or
necessary revisions.
(5) Once the seal design is approved,
the approval holder shall promptly notify MSHA, in writing, of all deficiencies of which they become aware.
(c) Seal installation approval. The installation of the approved seal design
shall be subject to approval in the ventilation plan. The mine operator
shall—
(1) Retain the seal design approval
and installation information for as
long as the seal is needed to serve the
purpose for which it was built.
(2) Designate a professional engineer
to conduct or have oversight of seal installation and certify that the provisions in the approved seal design specified in this section have been addressed
531
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00541
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.336
30 CFR Ch. I (7–1–19 Edition)
and are applicable to conditions at the
mine. A copy of the certification shall
be submitted to the District Manager
with the information provided in paragraph (c)(3) of this section and a copy
of the certification shall be retained
for as long as the seal is needed to
serve the purpose for which it was
built.
(3) Provide the following information
for approval in the ventilation plan—
(i) The MSHA Technical Support Approval Number;
(ii) A summary of the installation
procedures;
(iii) The mine map of the area to be
sealed and proposed seal locations that
include the deepest points of penetration prior to sealing. The mine map
shall be certified by a professional engineer or a professional land surveyor.
(iv) Specific mine site information,
including—
(A) Type of seal;
(B) Safety precautions taken prior to
seal achieving design strength;
(C) Methods to address site-specific
conditions
that
may
affect
the
strength and applicability of the seal
including set-back distances;
(D) Site preparation;
(E) Sequence of seal installations;
(F) Projected date of completion of
each set of seals;
(G) Supplemental roof support inby
and outby each seal;
(H) Water flow estimation and dimensions of the water drainage system
through the seals;
(I) Methods to ventilate the outby
face of seals once completed;
(J) Methods and materials used to
maintain each type of seal;
(K) Methods to address shafts and
boreholes in the sealed area;
(L) Assessment of potential for overpressures greater than 120 psi in sealed
area;
(M) Additional sampling locations;
and
(N) Additional information required
by the District Manager.
kpayne on VMOFRWIN702 with $$_JOB
[73 FR 21206, Apr. 18, 2008, as amended at 80
FR 52982, Sept. 2, 2015]
§ 75.336 Sampling and monitoring requirements.
(a) A certified person as defined in
§ 75.100 shall monitor atmospheres of
sealed areas. Sealed areas shall be
monitored,
whether
ingassing
or
outgassing, for methane and oxygen
concentrations and the direction of
leakage.
(1) Each sampling pipe and approved
sampling location shall be sampled at
least every 24 hours.
(i) Atmospheres with seals of 120 psi
or greater shall be sampled until the
design strength is reached for every
seal used to seal the area.
(ii) Atmospheres with seals less than
120 psi constructed before October 20,
2008 shall be monitored for methane
and oxygen concentrations and maintained inert. The operator may request
that the District Manager approve different sampling locations and frequencies in the ventilation plan, provided at least one sample is taken at
each set of seals at least every 7 days.
(iii) Atmospheres with seals less than
120 psi constructed after October 20,
2008 shall be monitored for methane
and oxygen concentrations and maintained inert. The operator may request
that the District Manager approve different sampling locations and frequencies in the ventilation plan after a
minimum of 14 days and after the seal
design strength is reached, provided at
least one sample is taken at each set of
seals at least every 7 days.
(2) The mine operator shall evaluate
the atmosphere in the sealed area to
determine whether sampling through
the sampling pipes in seals and approved locations provides appropriate
sampling locations of the sealed area.
The mine operator shall make the evaluation immediately after the minimum
14-day required sampling, if the mine
ventilation system is reconfigured, if
changes occur that adversely affect the
sealed area, or if the District Manager
requests an evaluation. When the results of the evaluations indicate the
need for additional sampling locations,
the mine operator shall provide the additional locations and have them approved in the ventilation plan. The District Manager may require additional
sampling locations and frequencies in
the ventilation plan.
(3) Mine operators with an approved
ventilation plan addressing spontaneous combustion pursuant to § 75.334(f)
532
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00542
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.337
shall sample the sealed atmosphere in
accordance with the ventilation plan.
(4) The District Manager may approve in the ventilation plan the use of
a continuous monitoring system in lieu
of monitoring provisions in this section.
(b)(1) Except as provided in § 75.336(d),
the atmosphere in the sealed area is
considered inert when the oxygen concentration is less than 10.0 percent or
the methane concentration is less than
3.0 percent or greater than 20.0 percent.
(2) Immediate action shall be taken
by the mine operator to restore an
inert sealed atmosphere behind seals
with strengths less than 120 psi. Until
the atmosphere in the sealed area is restored to an inert condition, the sealed
atmosphere shall be monitored at each
sampling pipe and approved location at
least once every 24 hours.
(c) Except as provided in § 75.336(d),
when a sample is taken from the sealed
atmosphere with seals of less than 120
psi and the sample indicates that the
oxygen concentration is 10 percent or
greater and methane is between 4.5 percent and 17 percent, the mine operator
shall immediately take an additional
sample and then immediately notify
the District Manager. When the additional sample indicates that the oxygen concentration is 10 percent or
greater and methane is between 4.5 percent and 17 percent, persons shall be
withdrawn from the affected area
which is the entire mine or other affected area identified by the operator
and approved by the District Manager
in the ventilation plan, except those
persons referred to in § 104(c) of the
Act. The operator may identify areas
in the ventilation plan to be approved
by the District Manager where persons
may be exempted from withdrawal. The
operator’s request shall address the location of seals in relation to: Areas
where persons work and travel in the
mine; escapeways and potential for
damage to the escapeways; and ventilation systems and controls in areas
where persons work or travel and
where
ventilation
is
used
for
escapeways. The operator’s request
shall also address the gas concentration of other sampling locations in the
sealed area and other required information. Before miners reenter the mine,
the mine operator shall have a ventilation plan revision approved by the District Manager specifying the actions to
be taken.
(d) In sealed areas with a demonstrated history of carbon dioxide or
sealed areas where inert gases have
been injected, the operator may request that the District Manager approve in the ventilation plan an alternative method to determine if the
sealed atmosphere is inert and when
miners have to be withdrawn. The mine
operator shall address in the ventilation plan the specific levels of methane, carbon dioxide, nitrogen and oxygen; the sampling methods and equipment used; and the methods to evaluate these concentrations underground
at the seal.
(e) Recordkeeping. (1) The certified
person shall promptly record each sampling result including the location of
the sampling points, whether ingassing
or outgassing, and oxygen and methane
concentrations. The results of oxygen
and methane samples shall be recorded
as the percentage of oxygen and methane measured by the certified person
and any hazardous condition found in
accordance with § 75.363.
(2) The mine operator shall retain
sampling records at the mine for at
least one year from the date of the
sampling.
[73 FR 21207, Apr. 18, 2008; 73 FR 27730, May
14, 2008]
§ 75.337 Construction
seals.
and
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00543
Fmt 8010
of
(a) The mine operator shall maintain
and repair seals to protect miners from
hazards of sealed areas.
(b) Prior to sealing, the mine operator shall—
(1) Remove insulated cables, batteries, and other potential electric ignition sources from the area to be
sealed when constructing seals, unless
it is not safe to do so. If ignition
sources cannot safely be removed, seals
must be constructed to at least 120 psi;
(2) Remove metallic objects through
or across seals; and
(3) Breach or remove all stoppings in
the first crosscut inby the seals immediately prior to sealing the area.
533
VerDate Sep<11>2014
repair
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.338
30 CFR Ch. I (7–1–19 Edition)
(c) A certified person designated by
the mine operator shall directly supervise seal construction and repair and—
(1) Examine each seal site immediately prior to construction or repair
to ensure that the site is in accordance
with the approved ventilation plan;
(2) Examine each seal under construction or repair during each shift to
ensure that the seal is being constructed or repaired in accordance with
the approved ventilation plan;
(3) Examine each seal upon completion of construction or repair to ensure
that construction or repair is in accordance with the approved ventilation
plan;
(4) Certify by initials, date, and time
that the examinations were made; and
(5) Make a record of the examination
at the completion of any shift during
which an examination was conducted.
The record shall include each deficiency and the corrective action taken.
The record shall be countersigned by
the mine foreman or equivalent mine
official by the end of the mine foreman’s or equivalent mine official’s
next regularly scheduled working shift.
The record shall be kept at the mine
for one year.
(d) Upon completion of construction
of each seal a senior mine management
official, such as a mine manager or superintendent, shall certify that the
construction, installation, and materials used were in accordance with the
approved ventilation plan. The mine
operator shall retain the certification
for as long as the seal is needed to
serve the purpose for which it was
built.
(e) The mine operator shall—
(1) Notify the District Manager between two and fourteen days prior to
commencement of seal construction;
(2) Notify the District Manager, in
writing, within five days of completion
of a set of seals and provide a copy of
the certification required in paragraph
(d) of this section; and
(3) Submit a copy of quality control
results to the District Manager for seal
material properties specified by § 75.335
within 30 days of completion of quality
control tests.
(f) Welding, cutting, and soldering.
Welding, cutting, and soldering with an
arc or flame are prohibited within 150
feet of a seal. An operator may request
a different location in the ventilation
plan to be approved by the District
Manager. The operator’s request must
address methods the mine operator will
use to continuously monitor atmospheric conditions in the sealed area
during welding or burning; the airflow
conditions in and around the work
area; the rock dust and water application methods; the availability of fire
extinguishers on hand; the procedures
to maintain safe conditions, and other
relevant factors.
(g) Sampling pipes. (1) For seals constructed after April 18, 2008, one nonmetallic sampling pipe shall be installed in each seal that shall extend
into the center of the first connecting
crosscut inby the seal. If an open crosscut does not exist, the sampling pipe
shall extend one-half of the distance of
the open entry inby the seal.
(2) Each sampling pipe shall be
equipped with a shut-off valve and appropriate fittings for taking gas samples.
(3) The sampling pipes shall be labeled to indicate the location of the
sampling point when more than one
sampling pipe is installed through a
seal.
(4) If a new seal is constructed to replace or reinforce an existing seal with
a sampling pipe, the sampling pipe in
the existing seal shall extend through
the new seal. An additional sampling
pipe shall be installed through each
new seal to sample the area between
seals, as specified in the approved ventilation plan.
(h) Water drainage system. For each
set of seals constructed after April 18,
2008, the seal at the lowest elevation
shall have a corrosion-resistant, nonmetallic water drainage system. Seals
shall not impound water or slurry.
Water or slurry shall not accumulate
within the sealed area to any depth
that can adversely affect a seal.
[73 FR 21207, Apr. 18, 2008]
§ 75.338
Training.
(a) Certified persons conducting sampling shall be trained in the use of appropriate sampling equipment, procedures, location of sampling points, frequency of sampling, size and condition
534
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00544
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.340
of the sealed area, and the use of continuous monitoring systems if applicable before they conduct sampling, and
annually thereafter. The mine operator
shall certify the date of training provided to certified persons and retain
each certification for two years.
(b) Miners constructing or repairing
seals, designated certified persons, and
senior mine management officials shall
be trained prior to constructing or repairing a seal and annually thereafter.
The training shall address materials
and procedures in the approved seal de-
sign and ventilation plan. The mine operator shall certify the date of training
provided each miner, certified person,
and senior mine management official
and retain each certification for two
years.
[73 FR 21208, Apr. 18, 2008]
§ 75.339
Seals records.
(a) The table entitled ‘‘Seal Recordkeeping Requirements’’ lists records
the operator shall maintain and the retention period for each record.
kpayne on VMOFRWIN702 with $$_JOB
TABLE—§ 75.339(a) SEAL RECORDKEEPING REQUIREMENTS
Record
Section reference
Retention time
(1) Approved seal design .......................................
75.335(c)(1) ...................
(2) Certification of Provisions of Approved Seal
Design is Addressed.
(3) Gas sampling records .......................................
(4) Record of examinations ....................................
(5) Certification of seal construction, installation,
and materials.
(6) Certification of Training for Persons that Sample.
(7) Certification of Training for Persons that Perform Seal Construction and Repair.
75.335(c)(2) ...................
75.338(a) .......................
As long as the seal is needed to serve the purpose for which it is built.
As long as the seal is needed to serve the purpose for which it is built.
1 year.
1 year.
As long as the seal is needed to serve the purpose for which it is built.
2 years.
75.338(b) .......................
2 years.
75.336(e)(2) ..................
75.337(c)(5) ...................
75.337(d) .......................
(b) Records required by §§ 75.335,
75.336, 75.337 and 75.338 shall be retained
at a surface location at the mine in a
secure book that is not susceptible to
alteration. The records may be retained electronically in a computer
system that is secure and not susceptible to alteration, if the mine operator
can immediately access the record
from the mine site.
(c) Upon request from an authorized
representative of the Secretary of
Labor, the Secretary of Health and
Human Services, or from the authorized representative of miners, mine operators shall promptly provide access
to any record listed in the table in this
section.
(d) Whenever an operator ceases to do
business or transfers control of the
mine to another entity, that operator
shall transfer all records required to be
maintained by this part, or a copy
thereof, to any successor operator who
shall maintain them for the required
period.
[73 FR 21208, Apr. 18, 2008]
§ 75.340 Underground electrical installations.
(a) Underground transformer stations, battery charging stations, substations, rectifiers, and water pumps
shall be housed in noncombustible
structures or areas or be equipped with
a fire suppression system meeting the
requirements of § 75.1107–3 through
§ 75.1107–16.
(1) When a noncombustible structure
or area is used, these installations
shall be—
(i) Ventilated with intake air that is
coursed into a return air course or to
the surface and that is not used to ventilate working places; or
(ii) Ventilated with intake air that is
monitored for carbon monoxide or
smoke by an AMS installed and operated according to § 75.351. Monitoring of
intake air ventilating battery charging
stations shall be done with sensors not
affected by hydrogen; or
(iii) Ventilated with intake air and
equipped with sensors to monitor for
heat and for carbon monoxide or
smoke. Monitoring of intake air ventilating battery charging stations shall
535
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00545
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.341
30 CFR Ch. I (7–1–19 Edition)
be done with sensors not affected by
hydrogen. The sensors shall deenergize
power to the installation, activate a
visual and audible alarm located outside of and on the intake side of the enclosure, and activate doors that will
automatically close when either of the
following occurs:
(A) The temperature in the noncombustible structure reaches 165 °F;
or
(B) The carbon monoxide concentration reaches 10 parts per million above
the ambient level for the area, or the
optical density of smoke reaches 0.022
per meter. At least every 31 days, sensors installed to monitor for carbon
monoxide shall be calibrated with a
known concentration of carbon monoxide and air sufficient to activate the
closing door, or each smoke sensor
shall be tested to determine that it
functions correctly.
(2) When a fire suppression system is
used, these installations shall be—
(i) Ventilated with intake air that is
coursed into a return air course or to
the surface and that is not used to ventilate working places; or
(ii) Ventilated with intake air that is
monitored for carbon monoxide or
smoke by an AMS installed and operated according to § 75.351. Monitoring of
intake air ventilating battery charging
stations shall be done with sensors not
affected by hydrogen.
(b) This section does not apply to—
(1) Rectifiers and power centers with
transformers that are either dry-type
or contain nonflammable liquid, if they
are located at or near the section and
are moved as the working section advances or retreats;
(2) Submersible pumps;
(3) Permissible pumps and associated
permissible switchgear;
(4) Pumps located on or near the section and that are moved as the working
section advances or retreats;
(5) Pumps installed in anthracite
mines; and
(6) Small portable pumps.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.341
Direct-fired intake air heaters.
(a) If any system used to heat intake
air malfunctions, the heaters affected
shall switch off automatically.
(b) Thermal overload devices shall
protect the blower motor from overheating.
(c) The fuel supply shall turn off
automatically if a flame-out occurs.
(d) Each heater shall be located or
guarded to prevent contact by persons
and shall be equipped with a screen at
the inlet to prevent combustible materials from passing over the burner
units.
(e) If intake air heaters use liquefied
fuel systems—
(1) Hydrostatic relief valves installed
on vaporizers and on storage tanks
shall be vented; and
(2) Fuel storage tanks shall be located or protected to prevent fuel from
leaking into the mine.
(f) Following any period of 8 hours or
more during which a heater does not
operate, the heater and its associated
components shall be examined within
its first hour of operation. Additionally, each heater and its components
shall be examined at least once each
shift that the heater operates. The examination shall include measurement
of the carbon monoxide concentration
at the bottom of each shaft, slope, or in
the drift opening where air is being
heated. The measurements shall be
taken by a person designated by the
operator or by a carbon monoxide sensor that is calibrated with a known
concentration of carbon monoxide and
air at least once every 31 days. When
the carbon monoxide concentration at
this location reaches 50 parts per million, the heater causing the elevated
carbon monoxide level shall be shut
down.
§ 75.342
Methane monitors.
(a)(1) MSHA approved methane monitors shall be installed on all face cutting machines, continuous miners,
longwall face equipment, loading machines, and other mechanized equipment used to extract or load coal within the working place.
(2) The sensing device for methane
monitors on longwall shearing machines shall be installed at the return
air end of the longwall face. An additional sensing device also shall be installed on the longwall shearing machine, downwind and as close to the
536
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00546
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
cutting head as practicable. An alternative location or locations for the
sensing device required on the longwall
shearing machine may be approved in
the ventilation plan.
(3) The sensing devices of methane
monitors shall be installed as close to
the working face as practicable.
(4) Methane monitors shall be maintained in permissible and proper operating condition and shall be calibrated
with a known air-methane mixture at
least once every 31 days. To assure that
methane monitors are properly maintained and calibrated, the operator
shall:
(i) Use persons properly trained in
the maintenance, calibration, and permissibility of methane monitors to
calibrate and maintain the devices.
(ii) Maintain a record of all calibration tests of methane monitors.
Records shall be maintained in a secure
book that is not susceptible to alteration or electronically in a computer
system so as to be secure and not susceptible to alteration.
(iii) Retain the record of calibration
tests for 1 year from the date of the
test. Records shall be retained at a surface location at the mine and made
available for inspection by authorized
representatives of the Secretary and
the representative of miners.
(b)(1) When the methane concentration at any methane monitor reaches
1.0 percent the monitor shall give a
warning signal.
(2) The warning signal device of the
methane monitor shall be visible to a
person who can deenergize electric
equipment or shut down diesel-powered
equipment on which the monitor is
mounted.
(c) The methane monitor shall automatically deenergize electric equipment or shut down diesel-powered
equipment on which it is mounted
when—
(1) The methane concentration at
any methane monitor reaches 2.0 percent; or
(2) The monitor is not operating
properly.
[61 FR 9829, Mar. 11, 1996, as amended at 61
FR 55527, Oct. 25, 1996]
§ 75.344
§ 75.343
Underground shops.
(a) Underground shops shall be
equipped with an automatic fire suppression system meeting the requirements of § 75.1107–3 through § 75.1107–16,
or be enclosed in a noncombustible
structure or area.
(b) Underground shops shall be ventilated with intake air that is coursed directly into a return air course.
§ 75.344
Compressors.
(a) Except compressors that are components of equipment such as locomotives and rock dusting machines and
compressors of less than 5 horsepower,
electrical compressors including those
that may start automatically shall be:
(1) Continuously attended by a person designated by the operator who can
see the compressor at all times during
its operation. Any designated person
attending the compressor shall be capable of activating the fire suppression
system and deenergizing or shuttingoff the compressor in the event of a
fire; or,
(2) Enclosed in a noncombustible
structure or area which is ventilated
by intake air coursed directly into a
return air course or to the surface and
equipped with sensors to monitor for
heat and for carbon monoxide or
smoke. The sensors shall deenergize
power to the compressor, activate a
visual and audible alarm located outside of and on the intake side of the enclosure, and activate doors to automatically enclose the noncombustible
structure or area when either of the
following occurs:
(i) The temperature in the noncombustible structure or area reaches
165 °F.
(ii) The carbon monoxide concentration reaches 10 parts per million above
the ambient level for the area, or the
optical density of smoke reaches 0.022
per meter. At least once every 31 days,
sensors installed to monitor for carbon
monoxide shall be calibrated with a
known concentration of carbon monoxide and air sufficient to activate the
closing door, and each smoke sensor
shall be tested to determine that it
functions correctly.
(b) Compressors, except those exempted in paragraph (a), shall be
537
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00547
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.350
30 CFR Ch. I (7–1–19 Edition)
equipped with a heat activated fire suppression system meeting the requirements of 75.1107–3 through 75.1107–16.
(c) Two portable fire extinguishers or
one extinguisher having at least twice
the minimum capacity specified for a
portable fire extinguisher in § 75.1100–
1(e) shall be provided for each compressor.
(d) Notwithstanding the requirements of § 75.1107–4, upon activation of
any fire suppression system used under
paragraph (b) of this section, the compressor shall be automatically deenergized or automatically shut off.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 9829, Mar. 11, 1996, as amended at 61
FR 55527, Oct. 25, 1996]
§ 75.350 Belt air course ventilation.
(a) The belt air course must not be
used as a return air course; and except
as provided in paragraph (b) of this section, the belt air course must not be
used to provide air to working sections
or to areas where mechanized mining
equipment is being installed or removed.
(1) The belt air course must be separated with permanent ventilation controls from return air courses and from
other intake air courses except as provided in paragraph (c) of this section.
(2) Effective December 31, 2009, the
air velocity in the belt entry must be
at least 50 feet per minute. When requested by the mine operator, the district manager may approve lower velocities in the ventilation plan based
on specific mine conditions. Air velocities must be compatible with all fire
detection systems and fire suppression
systems used in the belt entry.
(b) The use of air from a belt air
course to ventilate a working section,
or an area where mechanized mining
equipment is being installed or removed, shall be permitted only when
evaluated and approved by the district
manager in the mine ventilation plan.
The mine operator must provide justification in the plan that the use of
air from a belt entry would afford at
least the same measure of protection
as where belt haulage entries are not
used to ventilate working places. In addition, the following requirements
must be met:
(1) The belt entry must be equipped
with an AMS that is installed, oper-
ated, examined, and maintained as
specified in § 75.351.
(2) All miners must be trained annually in the basic operating principles of
the AMS, including the actions required in the event of activation of any
AMS alert or alarm signal. This training must be conducted prior to working
underground in a mine that uses belt
air to ventilate working sections or
areas where mechanized mining equipment is installed or removed. It must
be conducted as part of a miner’s 30
CFR part 48 new miner training (§ 48.5),
experienced miner training (§ 48.6), or
annual refresher training (§ 48.8).
(3)(i) The average concentration of
respirable dust in the belt air course,
when used as a section intake air
course, shall be maintained at or
below:
(A) 1.0 mg/m3.
(B) 0.5 mg/m3 as of August 1, 2016.
(ii) Where miners on the working section are on a reduced standard below
that specified in § 75.350(b)(3)(i), the average concentration of respirable dust
in the belt entry must be at or below
the lowest applicable standard on that
section.
(iii) A permanent designated area
(DA) for dust measurements must be
established at a point no greater than
50 feet upwind from the section loading
point in the belt entry when the belt
air flows over the loading point or no
greater than 50 feet upwind from the
point where belt air is mixed with air
from another intake air course near
the loading point. The DA must be
specified and approved in the ventilation plan.
(4) The primary escapeway must be
monitored for carbon monoxide or
smoke as specified in § 75.351(f).
(5) The area of the mine with a belt
air course must be developed with
three or more entries.
(6) In areas of the mine developed
after the effective date of this rule, unless approved by the district manager,
no more than 50% of the total intake
air, delivered to the working section or
to areas where mechanized mining
equipment is being installed or removed, can be supplied from the belt
air course. The locations for measuring
these air quantities must be approved
in the mine ventilation plan.
538
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00548
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.351
(7) The air velocity in the belt entry
must be at least 100 feet per minute.
When requested by the mine operator,
the district manager may approve
lower velocities in the ventilation plan
based on specific mine conditions.
(8) The air velocity in the belt entry
must not exceed 1,000 feet per minute.
When requested by the mine operator,
the district manager may approve
higher velocities in the ventilation
plan based on specific mine conditions.
(c) Notwithstanding the provisions of
§ 75.380(g), additional intake air may be
added to the belt air course through a
point-feed regulator. The location and
use of point feeds must be approved in
the mine ventilation plan.
(d) If the air through the point-feed
regulator enters a belt air course which
is used to ventilate a working section
or an area where mechanized mining
equipment is being installed or removed, the following conditions must
be met:
(1) The air current that will pass
through the point-feed regulator must
be monitored for carbon monoxide or
smoke at a point within 50 feet upwind
of the point-feed regulator. A second
point must be monitored 1,000 feet
upwind of the point-feed regulator unless the mine operator requests that a
lesser distance be approved by the district manager in the mine ventilation
plan based on mine specific conditions;
(2) The air in the belt air course must
be monitored for carbon monoxide or
smoke upwind of the point-feed regulator. This sensor must be in the belt
air course within 50 feet of the mixing
point where air flowing through the
point-feed regulator mixes with the
belt air;
(3) The point-feed regulator must be
provided with a means to close the regulator from the intake air course without requiring a person to enter the
crosscut where the point-feed regulator
is located. The point-feed regulator
must also be provided with a means to
close the regulator from a location in
the belt air course immediately upwind
of the crosscut containing the pointfeed regulator;
(4) A minimum air velocity of 300 feet
per minute must be maintained
through the point-feed regulator;
(5) The location(s) and use of a pointfeed regulator(s) must be approved in
the mine ventilation plan and shown
on the mine ventilation map; and
(6) An AMS must be installed, operated, examined, and maintained as
specified in § 75.351.
[69 FR 17526, Apr. 2, 2004, as amended at 70
FR 37266, June 29, 2005; 71 FR 12269, Mar. 9,
2006; 73 FR 80612, Dec. 31, 2008; 79 FR 24987,
May 1, 2014]
§ 75.351 Atmospheric monitoring systems.
(a) AMS operation. Whenever personnel are underground and an AMS is
used to fulfill the requirements of
§§ 75.323(d)(1)(ii),
75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), 75.350(d), or
75.362(f), the AMS must be operating
and a designated AMS operator must
be on duty at a location on the surface
of the mine where audible and visual
signals from the AMS must be seen or
heard and the AMS operator can
promptly respond to these signals.
(b) Designated surface location and
AMS operator. When an AMS is used to
comply
with
§§ 75.323(d)(1)(ii),
75.340(a)(1)(ii), 75.340(a)(2)(ii), 75.350(b),
75.350(d), or 75.362(f), the following requirements apply:
(1) The mine operator must designate
a surface location at the mine where
signals from the AMS will be received
and two-way voice communication is
maintained with each working section,
with areas where mechanized mining
equipment is being installed or removed, and with other areas designated
in the approved emergency evacuation
and firefighting program of instruction
(§ 75.1502).
(2) The mine operator must designate
an AMS operator to monitor and
promptly respond to all AMS signals.
The AMS operator must have as a primary duty the responsibility to monitor the malfunction, alert and alarm
signals of the AMS, and to notify appropriate personnel of these signals. In
the event of an emergency, the sole responsibility of the AMS operator shall
be to respond to the emergency.
(3) A map or schematic must be provided at the designated surface location that shows the locations and type
of AMS sensor at each location, and
the intended air flow direction at these
539
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00549
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.351
30 CFR Ch. I (7–1–19 Edition)
locations. This map or schematic must
be updated within 24 hours of any
change in this information.
(4) The names of the designated AMS
operators and other appropriate personnel, including the designated person
responsible for initiating an emergency
mine evacuation under § 75.1501, and
the method to contact these persons,
must be provided at the designated surface location.
(c) Minimum operating requirements.
AMSs
used
to
comply
with
§§ 75.323(d)(1)(ii),
75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), 75.350(d), or
75.362(f) must:
(1) Automatically provide visual and
audible signals at the designated surface location for any interruption of
circuit continuity and any electrical
malfunction of the system. These signals must be of sufficient magnitude to
be seen or heard by the AMS operator.
(2) Automatically provide visual and
audible signals at the designated surface location when the carbon monoxide concentration or methane concentration at any sensor reaches the
alert level as specified in § 75.351(i).
These signals must be of sufficient
magnitude to be seen or heard by the
AMS operator.
(3) Automatically provide visual and
audible signals at the designated surface location distinguishable from
alert signals when the carbon monoxide, smoke, or methane concentration at any sensor reaches the alarm
level as specified in § 75.351(i). These
signals must be of sufficient magnitude
to be seen or heard by the AMS operator.
(4) Automatically provide visual and
audible signals at all affected working
sections and at all affected areas where
mechanized mining equipment is being
installed or removed when the carbon
monoxide, smoke, or methane concentration at any sensor reaches the
alarm level as specified in § 75.351(i).
These signals must be of sufficient
magnitude to be seen or heard by miners working at these locations. Methane signals must be distinguishable
from other signals.
(5) Automatically provide visual and
audible signals at other locations as
specified in Mine Emergency Evacuation and Firefighting Program of In-
struction (§ 75.1502) when the carbon
monoxide, smoke, or methane concentration at any sensor reaches the
alarm level as specified in § 75.351(i).
These signals must be seen or heard by
miners working at these locations.
Methane alarms must be distinguishable from other signals.
(6) Identify at the designated surface
location the operational status of all
sensors.
(7) Automatically provide visual and
audible alarm signals at the designated
surface location, at all affected working sections, and at all affected areas
where mechanized mining equipment is
being installed or removed when the
carbon monoxide level at any two consecutive sensors alert at the same
time. These signals must be seen or
heard by the AMS operator and miners
working at these locations.
(d) Location and installation of AMS
sensors. (1) All AMS sensors, as specified in §§ 75.351(e) through 75.351(h),
must be located such that measurements are representative of the mine
atmosphere in these locations.
(2) Carbon monoxide or smoke sensors must be installed near the center
in the upper third of the entry, in a location that does not expose personnel
working on the system to unsafe conditions. Sensors must not be located in
abnormally high areas or in other locations where air flow patterns do not
permit products of combustion to be
carried to the sensors.
(3) Methane sensors must be installed
near the center of the entry, at least 12
inches from the roof, ribs, and floor, in
a location that would not expose personnel working on the system to unsafe conditions.
(e) Location of sensors-belt air course.
(1) In addition to the requirements of
paragraph (d) of this section, any AMS
used to monitor belt air courses under
§ 75.350(b) must have approved sensors
to monitor for carbon monoxide at the
following locations:
(i) At or near the working section
belt tailpiece in the air stream ventilating the belt entry. In longwall
mining systems the sensor must be located upwind in the belt entry at a distance no greater than 150 feet from the
mixing point where intake air is mixed
540
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00550
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.351
with the belt air at or near the tailpiece;
(ii) No more than 50 feet upwind from
the point where the belt air course is
combined with another air course or
splits into multiple air courses;
(iii) At intervals not to exceed 1,000
feet along each belt entry. However, in
areas along each belt entry where air
velocities are between 50 and 100 feet
per minute, spacing of sensors must
not exceed 500 feet. In areas along each
belt entry where air velocities are less
than 50 feet per minute, the sensor
spacing must not exceed 350 feet;
(iv) Not more than 100 feet downwind
of each belt drive unit, each tailpiece,
transfer point, and each belt take-up. If
the belt drive, tailpiece, and/or take-up
for a single transfer point are installed
together in the same air course, and
the distance between the units is less
than 100 feet, they may be monitored
with one sensor downwind of the last
component. If the distance between the
units exceeds 100 feet, additional sensors are required downwind of each belt
drive unit, each tailpiece, transfer
point, and each belt take-up; and
(v) At other locations in any entry
that is part of the belt air course as required and specified in the mine ventilation plan.
(2) Smoke sensors must be installed
to monitor the belt entry under
§ 75.350(b) at the following locations:
(i) At or near the working section
belt tailpiece in the air stream ventilating the belt entry. In longwall
mining systems the sensor must be located upwind in the belt entry at a distance no greater than 150 feet from the
mixing point where intake air is mixed
with the belt air at or near the tailpiece;
(ii) Not more than 100 feet downwind
of each belt drive unit, each tailpiece
transfer point, and each belt take-up. If
the belt drive, tailpiece, and/or take-up
for a single transfer point are installed
together in the same air course, and
the distance between the units is less
than 100 feet, they may be monitored
with one sensor downwind of the last
component. If the distance between the
units exceeds 100 feet, additional sensors are required downwind of each belt
drive unit, each tailpiece, transfer
point, and each belt take-up; and
(iii) At intervals not to exceed 3,000
feet along each belt entry.
(iv) This provision shall be effective
one year after the Secretary has determined that a smoke sensor is available
to reliably detect fire in underground
coal mines.
(f) Locations of sensors—the primary
escapeway. When used to monitor the
primary escapeway under § 75.350(b)(4),
carbon monoxide or smoke sensors
must be located in the primary
escapeway within 500 feet of the working section and areas where mechanized mining equipment is being installed or removed. In addition, another sensor must be located within 500
feet inby the beginning of the panel.
The point-feed sensor required by
§ 75.350(d)(1) may be used as the sensor
at the beginning of the panel if it is located within 500 feet inby the beginning of the panel.
(g) Location of sensors—return air
splits. (1) If used to monitor return air
splits under § 75.362(f), a methane sensor must be installed in the return air
split between the last working place,
longwall or shortwall face ventilated
by that air split, and the junction of
the return air split with another air
split, seal, or worked out area.
(2) If used to monitor a return air
split under § 75.323(d)(1)(ii), the methane sensors must be installed at the
following locations:
(i) In the return air course opposite
the section loading point, or, if exhausting auxiliary fan(s) are used, in
the return air course no closer than 300
feet downwind from the fan exhaust
and at a point opposite or immediately
outby the section loading point; and
(ii) Immediately upwind from the location where the return air split meets
another air split or immediately
upwind of the location where an air
split is used to ventilate seals or
worked-out areas.
(h) Location of sensors—electrical installations. When monitoring the intake
air ventilating underground transformer stations, battery charging stations, substations, rectifiers, or water
pumps
under
§ 75.340(a)(1)(ii)
or
§ 75.340(a)(2)(ii), at least one sensor
must be installed to monitor the mine
atmosphere for carbon monoxide or
smoke, located downwind and not
541
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00551
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.351
30 CFR Ch. I (7–1–19 Edition)
greater than 50 feet from the electrical
installation being monitored.
(i) Establishing alert and alarm levels.
An AMS installed in accordance with
the following paragraphs must initiate
alert and alarm signals at the specified
levels, as indicated:
(1) For § 75.323(d)(1)(ii) alarm at 1.5%
methane.
(2)
For
§§ 75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), and 75.350(d),
alert at 5 ppm carbon monoxide above
the ambient level and alarm at 10 ppm
carbon monoxide above the ambient
level when carbon monoxide sensors
are used; and alarm at a smoke optical
density of 0.022 per meter when smoke
sensors are used. Reduced alert and
alarm settings approved by the district
manager may be required for carbon
monoxide sensors identified in the
mine ventilation plan, § 75.371(nn).
(3) For § 75.362(f), alert at 1.0% methane and alarm at 1.5% methane.
(j) Establishing carbon monoxide ambient levels. Carbon monoxide ambient
levels and the means to determine
these levels must be approved in the
mine ventilation plan (§ 75.371(hh)) for
monitors installed in accordance with
§§ 75.340(a)(1)(ii),
75.340(a)(2)(ii),
75.350(b), and 75.350(d).
(k) Installation and maintenance. An
AMS installed in accordance with
§§ 75.323(d)(1)(ii),
75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), 75.350(d), or
75.362(f) must be installed and maintained by personnel trained in the installation and maintenance of the system. The system must be maintained
in proper operating condition.
(l) Sensors. Sensors used to monitor
for carbon monoxide, methane, and
smoke must be either of a type listed
and installed in accordance with the
recommendations of a nationally recognized testing laboratory approved by
the Secretary; or these sensors must be
of a type, and installed in a manner,
approved by the Secretary.
(m) Time delays. When a demonstrated need exists, time delays may
be incorporated into the AMS. These
time delays must only be used to account for non-fire related carbon monoxide alert and alarm sensor signals.
These time delays are limited to no
more than three minutes. The use and
length of any time delays, or other
techniques or methods which eliminate
or reduce the need for time delays,
must be specified and approved in the
mine ventilation plan.
(n) Examination, testing, and calibration. (1) At least once each shift when
belts are operated as part of a production shift, sensors used to detect carbon monoxide or smoke in accordance
with §§ 75.350(b), and 75.350(d), and
alarms installed in accordance with
§ 75.350(b) must be visually examined.
(2) At least once every seven days,
alarms for AMS installed in accordance
with §§ 75.350(b), and 75.350(d) must be
functionally tested for proper operation.
(3) At intervals not to exceed 31
days—
(i) Each carbon monoxide sensor installed
in
accordance
with
§§ 75.340(a)(1)(ii),
75.340(a)(2)(ii),
75.350(b), or 75.350(d) must be calibrated
in accordance with the manufacturer’s
calibration specifications. Calibration
must be done with a known concentration of carbon monoxide in air sufficient to activate the alarm;
(ii) Each smoke sensor installed in
accordance
with
§§ 75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), or 75.350(d)
must be functionally tested in accordance with the manufacturer’s calibration specifications;
(iii) Each methane sensor installed in
accordance with §§ 75.323(d)(1)(ii) or
75.362(f) must be calibrated in accordance with the manufacturer’s calibration specifications. Calibration must
be done with a known concentration of
methane in air sufficient to activate an
alarm.
(iv) If the alert or alarm signals will
be activated during calibration of sensors, the AMS operator must be notified prior to and upon completion of
calibration. The AMS operator must
notify miners on affected working sections, areas where mechanized mining
equipment is being installed or removed, or other areas designated in the
approved emergency evacuation and
firefighting program of instruction
(§ 75.1502) when calibration will activate alarms and when calibration is
completed.
(4) Gases used for the testing and
calibration of AMS sensors must be
traceable to the National Institute of
542
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00552
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.352
Standards and Technology reference
standard for the specific gas. When
these reference standards are not available for a specific gas, calibration
gases must be traceable to an analytical standard which is prepared using a
method traceable to the National Institute of Standards and Technology.
Calibration gases must be within ±2.0
percent of the indicated gas concentration.
(o) Recordkeeping. (1) When an AMS is
used to comply with §§ 75.323(d)(1)(ii),
75.340(a)(1)(ii), 75.340(a)(2)(ii), 75.350(b),
75.350(d), or 75.362(f), individuals designated by the operator must make the
following records by the end of the
shift in which the following event(s)
occur:
(i) If an alert or alarm signal occurs,
a record of the date, time, location and
type of sensor, and the cause for the
activation.
(ii) If an AMS malfunctions, a record
of the date, the extent and cause of the
malfunction, and the corrective action
taken to return the system to proper
operation.
(iii) A record of the seven-day tests of
alert and alarm signals; calibrations;
and maintenance of the AMS must be
made by the person(s) performing these
actions.
(2) The person entering the record
must include their name, date, and signature in the record.
(3) The records required by this section must be kept either in a secure
book that is not susceptible to alteration, or electronically in a computer
system that is secure and not susceptible to alteration. These records must
be maintained separately from other
records and identifiable by a title, such
as the ‘AMS log.’
(p) Retention period. Records must be
retained for at least one year at a surface location at the mine and made
available for inspection by miners and
authorized representatives of the Secretary.
(q) Training. (1) All AMS operators
must be trained annually in the proper
operation of the AMS. This training
must include the following subjects:
(i) Familiarity with underground
mining systems;
(ii) Basic atmospheric monitoring
system requirements;
(iii) The mine emergency evacuation
and firefighting program of instruction;
(iv) The mine ventilation system including planned air directions;
(v) Appropriate response to alert,
alarm and malfunction signals;
(vi) Use of mine communication systems including emergency notification
procedures; and
(vii) AMS recordkeeping requirements.
(2) At least once every six months,
all AMS operators must travel to all
working sections.
(3) A record of the content of training, the person conducting the training, and the date the training was conducted, must be maintained at the
mine for at least one year by the mine
operator.
(r) Communications. When an AMS is
used to comply with § 75.350(b), a twoway voice communication system required by § 75.1600 must be installed in
an entry that is separate from the
entry in which the AMS is installed no
later than August 2, 2004. The two-way
voice communication system may be
installed in the entry where the intake
sensors required by §§ 75.350(b)(4) or
75.350(d)(1) are installed.
[69 FR 17527, Apr. 2, 2004, as amended at 73
FR 80612, Dec. 31, 2008]
§ 75.352 Actions in response to AMS
malfunction, alert, or alarm signals.
(a) When a malfunction, alert, or
alarm signal is received at the designated surface location, the sensor(s)
that are activated must be identified
and the AMS operator must promptly
notify appropriate personnel.
(b) Upon notification of a malfunction, alert, or alarm signal, appropriate
personnel must promptly initiate an
investigation to determine the cause of
the signal and take the required actions set forth in paragraphs (c), (d), or
(e) of this section.
(c) If any sensor installed in accordance
with
§§ 75.340(a)(1)(ii),
75.340(a)(2)(ii), 75.350(b), or 75.350(d) indicates an alarm or if any two consecutive sensors indicate alert at the same
time, the following procedures must be
followed unless the cause of the signal(s) is known not to be a hazard to
miners:
543
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00553
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.360
30 CFR Ch. I (7–1–19 Edition)
(1) Appropriate personnel must notify
miners in affected working sections, in
affected areas where mechanized mining equipment is being installed or removed, and at other locations specified
in the § 75.1502 approved mine emergency evacuation and firefighting program of instruction; and
(2) All personnel in the affected
areas, unless assigned other duties
under § 75.1502, must be withdrawn
promptly to a safe location identified
in the mine emergency evacuation and
firefighting program of instruction.
(d) If there is an alert or alarm signal
from a methane sensor installed in accordance with §§ 75.323(d)(1)(ii) and
75.362(f), an investigation must be initiated to determine the cause of the signal, and the actions required under
§ 75.323 must be taken.
(e) If any fire detection components
of the AMS malfunction or are inoperative, immediate action must be taken
to return the system to proper operation. While the AMS component repairs are being made, operation of the
belt may continue if the following conditions are met:
(1) If one AMS sensor malfunctions or
becomes inoperative, a trained person
must continuously monitor for carbon
monoxide or smoke at the inoperative
sensor.
(2) If two or more adjacent AMS sensors malfunction or become inoperative, a trained person(s) must patrol
and continuously monitor for carbon
monoxide or smoke so that the affected
areas will be traveled each hour in
their entirety, or a trained person
must be stationed to monitor at each
inoperative sensor.
(3) If the complete AMS malfunctions
or becomes inoperative, trained persons must patrol and continuously
monitor for carbon monoxide or smoke
so that the affected areas will be traveled each hour in their entirety.
(4) The trained person(s) monitoring
under this section must, at a minimum, have two-way voice communication capabilities with the AMS operator at intervals not to exceed 2,000
feet and report contaminant levels to
the AMS operator at intervals not to
exceed 60 minutes.
(5) The trained person(s) monitoring
under this section must report imme-
diately to the AMS operator any concentration of the contaminant that
reaches either the alert or alarm level
specified in § 75.351(i), or the alternate
alert and alarm levels specified in
paragraph (e)(7) of this section, unless
the source of the contaminant is
known not to present a hazard.
(6) Detectors used to monitor under
this section must have a level of detectability equal to that required of
the sensors in § 75.351(l).
(7) For those AMSs using sensors
other than carbon monoxide sensors,
an alternate detector and the alert and
alarm levels associated with that detector must be specified in the approved mine ventilation plan.
(f) If the minimum air velocity is not
maintained
when
required
under
§ 75.350(b)(7), immediate action must be
taken to return the ventilation system
to proper operation. While the ventilation system is being corrected, operation of the belt may continue only
while a trained person(s) patrols and
continuously monitors for carbon monoxide or smoke as set forth in
§§ 75.352(e)(3) through (7), so that the affected areas will be traveled each hour
in their entirety.
(g) The AMS shall automatically provide both a visual and audible signal in
the belt entry at the point-feed regulator location, at affected sections, and
at the designated surface location
when carbon monoxide concentrations
reach:
(1) The alert level at both point-feed
intake monitoring sensors; or
(2) The alarm level at either pointfeed intake monitoring sensor.
[69 FR 17529, Apr. 2, 2004, as amended at 73
FR 80613, Dec. 31, 2008]
§ 75.360 Preshift examination at fixed
intervals.
(a)(1) Except as provided in paragraph (a)(2) of this section, a certified
person designated by the operator must
make a preshift examination within 3
hours preceding the beginning of any 8hour interval during which any person
is scheduled to work or travel underground. No person other than certified
examiners may enter or remain in any
underground area unless a preshift examination has been completed for the
544
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00554
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.360
established 8-hour interval. The operator must establish 8-hour intervals of
time subject to the required preshift
examinations.
(2) Preshift examinations of areas
where pumpers are scheduled to work
or travel shall not be required prior to
the pumper entering the areas if the
pumper is a certified person and the
pumper conducts an examination for
hazardous conditions and violations of
the mandatory health or safety standards referenced in paragraph (b)(11) of
this section, tests for methane and oxygen deficiency, and determines if the
air is moving in its proper direction in
the area where the pumper works or
travels. The examination of the area
must be completed before the pumper
performs any other work. A record of
all hazardous conditions and violations
of the mandatory health or safety
standards found by the pumper shall be
made and retained in accordance with
§ 75.363 of this part.
(b) The person conducting the
preshift examination shall examine for
hazardous conditions and violations of
the mandatory health or safety standards referenced in paragraph (b)(11) of
this section, test for methane and oxygen deficiency, and determine if the air
is moving in its proper direction at the
following locations:
(1) Roadways, travelways and track
haulageways where persons are scheduled, prior to the beginning of the
preshift examination, to work or travel
during the oncoming shift.
(2) Belt conveyors that will be used
to transport persons during the oncoming shift and the entries in which these
belt conveyors are located.
(3) Working sections and areas where
mechanized mining equipment is being
installed or removed, if anyone is
scheduled to work on the section or in
the area during the oncoming shift.
The scope of the examination shall include the working places, approaches
to worked-out areas and ventilation
controls on these sections and in these
areas, and the examination shall include tests of the roof, face and rib conditions on these sections and in these
areas.
(4) Approaches to worked-out areas
along intake air courses and at the entries used to carry air into worked-out
areas if the intake air passing the approaches is used to ventilate working
sections where anyone is scheduled to
work during the oncoming shift. The
examination of the approaches to the
worked-out areas shall be made in the
intake air course immediately inby
and outby each entry used to carry air
into the worked-out area. An examination of the entries used to carry air
into the worked-out areas shall be conducted at a point immediately inby the
intersection of each entry with the intake air course.
(5) Seals along intake air courses
where intake air passes by a seal to
ventilate working sections where anyone is scheduled to work during the oncoming shift.
(6)(i) Entries and rooms developed
after November 15, 1992, and developed
more than 2 crosscuts off an intake air
course without permanent ventilation
controls where intake air passes
through or by these entries or rooms to
reach a working section where anyone
is scheduled to work during the oncoming shift; and,
(ii) Entries and rooms developed
after November 15, 1992, and driven
more than 20 feet off an intake air
course without a crosscut and without
permanent ventilation controls where
intake air passes through or by these
entries or rooms to reach a working
section where anyone is scheduled to
work during the oncoming shift.
(7) Areas where trolley wires or trolley feeder wires are to be or will remain energized during the oncoming
shift.
(8) High spots along intake air
courses where methane is likely to accumulate, if equipment will be operated in the area during the shift.
(9) Underground electrical installations referred to in § 75.340(a), except
those pumps listed in § 75.340 (b)(2)
through (b)(6), and areas where compressors subject to § 75.344 are installed
if the electrical installation or compressor is or will be energized during
the shift.
(10) Other areas where work or travel
during the oncoming shift is scheduled
prior to the beginning of the preshift
examination.
545
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00555
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.360
30 CFR Ch. I (7–1–19 Edition)
(11) Preshift examinations shall include examinations to identify violations of the standards listed below:
(i) §§ 75.202(a) and 75.220(a)(1)—roof
control;
(ii) §§ 75.333(h) and 75.370(a)(1)—ventilation, methane;
(iii) §§ 75.400 and 75.403—accumulations of combustible materials and application of rock dust;
(iv) § 75.1403—other safeguards, limited to maintenance of travelways
along belt conveyors, off track haulage
roadways, and track haulage, track
switches, and other components for
haulage;
(v) § 75.1722(a)—guarding moving machine parts; and
(vi) § 75.1731(a)—maintenance of belt
conveyor components.
(c) The person conducting the
preshift examination shall determine
the volume of air entering each of the
following areas if anyone is scheduled
to work in the areas during the oncoming shift:
(1) In the last open crosscut of each
set of entries or rooms on each working
section and areas where mechanized
mining equipment is being installed or
removed. The last open crosscut is the
crosscut in the line of pillars containing the permanent stoppings that
separate the intake air courses and the
return air courses.
(2) On each longwall or shortwall in
the intake entry or entries at the intake end of the longwall or shortwall
face immediately outby the face and
the velocity of air at each end of the
face at the locations specified in the
approved ventilation plan.
(3) At the intake end of any pillar
line—
(i) If a single split of air is used, in
the intake entry furthest from the return air course, immediately outby the
first open crosscut outby the line of
pillars being mined; or
(ii) If a split system is used, in the intake entries of each split immediately
inby the split point.
(d) The person conducting the
preshift examination shall check the
refuge alternative for damage, the integrity of the tamper-evident seal and
the mechanisms required to deploy the
refuge alternative, and the ready availability of compressed oxygen and air.
(e) The district manager may require
the operator to examine other areas of
the mine or examine for other hazards
and violations of other mandatory
health or safety standards found during
the preshift examination.
(f) Certification. At each working
place examined, the person doing the
preshift examination shall certify by
initials, date, and the time, that the
examination was made. In areas required to be examined outby a working
section, the certified person shall certify by initials, date, and the time at
enough locations to show that the entire area has been examined.
(g) Recordkeeping. A record of the results of each preshift examination, including a record of hazardous conditions and violations of the nine mandatory health or safety standards and
their locations found by the examiner
during each examination, and of the results and locations of air and methane
measurements, shall be made on the
surface before any persons, other than
certified persons conducting examinations required by this subpart, enter
any underground area of the mine. The
results of methane tests shall be recorded as the percentage of methane
measured by the examiner. The record
shall be made by the certified person
who made the examination or by a person designated by the operator. If the
record is made by someone other than
the examiner, the examiner shall
verify the record by initials and date
by or at the end of the shift for which
the examination was made. A record
shall also be made by a certified person
of the action taken to correct hazardous conditions and violations of
mandatory health or safety standards
found during the preshift examination.
All preshift and corrective action
records shall be countersigned by the
mine foreman or equivalent mine official by the end of the mine foreman’s
or equivalent mine official’s next regularly scheduled working shift. The
records required by this section shall
be made in a secure book that is not
susceptible to alteration or electronically in a computer system so as to be
secure and not susceptible to alteration.
(h) Retention period. Records shall be
retained at a surface location at the
546
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00556
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
mine for at least 1 year and shall be
made available for inspection by authorized representatives of the Secretary and the representative of miners.
[61 FR 9829, Mar. 11, 1996, as amended at 61
FR 55527, Oct. 25, 1996; 62 FR 35085, June 30,
1997; 64 FR 45170, Aug. 19, 1999; 73 FR 80697,
Dec. 31, 2008; 77 FR 20714, Apr. 6, 2012]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.361
Supplemental examination.
(a)(1) Except for certified persons
conducting examinations required by
this subpart, within 3 hours before anyone enters an area in which a preshift
examination has not been made for
that shift, a certified person shall examine the area for hazardous conditions and violations of the mandatory
health or safety standards referenced
in paragraph (a)(2) of this section, determine whether the air is traveling in
its proper direction and at its normal
volume, and test for methane and oxygen deficiency.
(2) Supplemental examinations shall
include examinations to identify violations of the standards listed below:
(i) §§ 75.202(a) and 75.220(a)(1)—roof
control;
(ii) §§ 75.333(h) and 75.370(a)(1)—ventilation, methane;
(iii) §§ 75.400 and 75.403—accumulations of combustible materials and application of rock dust;
(iv) § 75.1403—other safeguards, limited to maintenance of travelways
along belt conveyors, off track haulage
roadways, and track haulage, track
switches, and other components for
haulage;
(v) § 75.1722(a)—guarding moving machine parts; and
(vi) § 75.1731(a)—maintenance of belt
conveyor components.
(b) Certification. At each working
place examined, the person making the
supplemental examination shall certify
by initials, date, and the time, that the
examination was made. In areas required to be examined outby a working
section, the certified person shall certify by initials, date, and the time at
enough locations to show that the entire area has been examined.
[61 FR 9829, Mar. 11, 1996, as amended at 77
FR 20714, 2012]
§ 75.362
§ 75.362
On-shift examination.
(a)(1) At least once during each shift,
or more often if necessary for safety, a
certified person designated by the operator shall conduct an on-shift examination of each section where anyone is
assigned to work during the shift and
any area where mechanized mining
equipment is being installed or removed during the shift. The certified
person shall check for hazardous conditions and violations of the mandatory
health or safety standards referenced
in paragraph (a)(3) of this section, test
for methane and oxygen deficiency, and
determine if the air is moving in its
proper direction.
(2) A person designated by the operator shall conduct an examination and
record the results and the corrective
actions taken to assure compliance
with the respirable dust control parameters specified in the approved mine
ventilation plan. In those instances
when a shift change is accomplished
without an interruption in production
on a section, the examination shall be
made anytime within 1 hour after the
shift change. In those instances when
there is an interruption in production
during the shift change, the examination shall be made before production
begins on a section. Deficiencies in
dust controls shall be corrected before
production begins or resumes. The examination shall include: Air quantities
and velocities; water pressures and
flow rates; excessive leakage in the
water delivery system; water spray
numbers and orientations; section ventilation and control device placement;
roof bolting machine dust collector
vacuum levels; scrubber air flow rate;
work practices required by the ventilation plan; and any other dust suppression measures. Measurements of the air
velocity and quantity, water pressure
and flow rates are not required if continuous monitoring of these controls is
used and indicates that the dust controls are functioning properly.
(3) On-shift examinations shall include examinations to identify violations of the standards listed below:
(i) §§ 75.202(a) and 75.220(a)(1)—roof
control;
(ii) §§ 75.333(h) and 75.370(a)(1)—ventilation, methane;
547
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00557
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.362
30 CFR Ch. I (7–1–19 Edition)
(iii) §§ 75.400 and 75.403—accumulations of combustible materials and application of rock dust;
(iv) § 75.1403—other safeguards, limited to maintenance of travelways
along belt conveyors, off track haulage
roadways, and track haulage, track
switches, and other components for
haulage;
(v) § 75.1722(a)—guarding moving machine parts; and
(vi) § 75.1731(a)—maintenance of belt
conveyor components.
(b) During each shift that coal is produced, a certified person shall examine
for hazardous conditions and violations
of the mandatory health or safety
standards referenced in paragraph
(a)(3) of this section along each belt
conveyor haulageway where a belt conveyor is operated. This examination
may be conducted at the same time as
the preshift examination of belt conveyors and belt conveyor haulageways,
if the examination is conducted within
3 hours before the oncoming shift.
(c) Persons conducting the on-shift
examination shall determine at the following locations:
(1) The volume of air in the last open
crosscut of each set of entries or rooms
on each section and areas where
mechanized mining equipment is being
installed or removed. The last open
crosscut is the crosscut in the line of
pillars containing the permanent
stoppings that separate the intake air
courses and the return air courses.
(2) The volume of air on a longwall or
shortwall,
including
areas
where
longwall or shortwall equipment is
being installed or removed, in the intake entry or entries at the intake end
of the longwall or shortwall.
(3) The velocity of air at each end of
the longwall or shortwall face at the
locations specified in the approved ventilation plan.
(4) The volume of air at the intake
end of any pillar line—
(i) Where a single split of air is used
in the intake entry furthest from the
return air course immediately outby
the first open crosscut outby the line
of pillars being mined; or
(ii) Where a split system is used in
the intake entries of each split immediately inby the split point.
(d) (1) A qualified person shall make
tests for methane—
(i) At the start of each shift at each
working place before electrically operated equipment is energized; and
(ii) Immediately before equipment is
energized, taken into, or operated in a
working place; and
(iii) At 20-minute intervals, or more
often if required in the approved ventilation plan at specific locations, during the operation of equipment in the
working place.
(2) Except as provided for in paragraph (d)(3) of this section, these methane tests shall be made at the face
from under permanent roof support,
using extendable probes or other acceptable means. When longwall or
shortwall mining systems are used,
these methane tests shall be made at
the shearer, the plow, or the cutting
head. When mining has been stopped
for more than 20 minutes, methane
tests shall be conducted prior to the
start up of equipment.
(3) As an alternative method of compliance with paragraph (d)(2) of this
section during roof bolting, methane
tests may be made by sweeping an area
not less than 16 feet inby the last area
of permanently supported roof, using a
probe or other acceptable means. This
method of testing is conditioned on
meeting the following requirements:
(i) The roof bolting machine must be
equipped with an integral automated
temporary roof support (ATRS) system
that meets the requirements of 30 CFR
75.209.
(ii) The roof bolting machine must
have a permanently mounted, MSHAapproved methane monitor which
meets the maintenance and calibration
requirements of 30 CFR 75.342(a)(4), the
warning signal requirements of 30 CFR
75.342(b), and the automatic deenergization requirements of 30 CFR
75.342(c).
(iii) The methane monitor sensor
must be mounted near the inby end and
within 18 inches of the longitudinal
center of the ATRS support, and positioned at least 12 inches from the roof
when the ATRS is fully deployed.
(iv) Manual methane tests must be
made at intervals not exceeding 20
minutes. The test may be made either
from under permanent roof support or
548
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00558
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.363
from the roof bolter’s work position
protected by the deployed ATRS.
(v) Once a methane test is made at
the face, all subsequent methane tests
in the same area of unsupported roof
must also be made at the face, from
under permanent roof support, using
extendable probes or other acceptable
means at intervals not exceeding 20
minutes.
(vi) The district manager may require that the ventilation plan include
the minimum air quantity and the position and placement of ventilation
controls to be maintained during roof
bolting.
(e) If auxiliary fans and tubing are
used, they shall be inspected frequently.
(f) During each shift that coal is produced and at intervals not exceeding 4
hours, tests for methane shall be made
by a certified person or by an atmospheric monitoring system (AMS) in
each return split of air from each
working section between the last working place, or longwall or shortwall face,
ventilated by that split of air and the
junction of the return air split with another air split, seal, or worked-out
area. If auxiliary fans and tubing are
used, the tests shall be made at a location outby the auxiliary fan discharge.
(g) Certification. (1) The person conducting the on-shift examination in
belt haulage entries shall certify by
initials, date, and time that the examination was made. The certified person
shall certify by initials, date, and the
time at enough locations to show that
the entire area has been examined.
(2) The certified person directing the
on-shift examination to assure compliance with the respirable dust control
parameters specified in the approved
mine ventilation plan shall:
(i) Certify by initials, date, and time
on a board maintained at the section
load-out or similar location showing
that the examination was made prior
to resuming production; and
(ii) Verify, by initials and date, the
record of the results of the examination required under (a)(2) of this section to assure compliance with the respirable dust control parameters specified in the mine ventilation plan. The
verification shall be made no later
than the end of the shift for which the
examination was made.
(3) The mine foreman or equivalent
mine official shall countersign each examination record required under (a)(2)
of this section after it is verified by the
certified person under (g)(2)(ii) of this
section, and no later than the end of
the mine foreman’s or equivalent mine
official’s next regularly scheduled
working shift. The record shall be
made in a secure book that is not susceptible to alteration or electronically
in a computer system so as to be secure
and not susceptible to alteration.
(4) Records shall be retained at a surface location at the mine for at least 1
year and shall be made available for inspection by authorized representatives
of the Secretary and the representative
of miners.
[61 FR 9829, Mar. 11, 1996; 61 FR 26442, May 28,
1996, as amended at 68 FR 40138, July 7, 2003;
77 FR 20715, Apr. 6, 2012; 79 FR 24987, May 1,
2014]
§ 75.363 Hazardous conditions and violations of mandatory health or safety standards; posting, correcting,
and recording.
(a) Any hazardous condition found by
the mine foreman or equivalent mine
official, assistant mine foreman or
equivalent mine official, or other certified persons designated by the operator for the purposes of conducting examinations under this subpart D, shall
be posted with a conspicuous danger
sign where anyone entering the areas
would pass. A hazardous condition
shall be corrected immediately or the
area shall remain posted until the hazardous condition is corrected. If the
condition creates an imminent danger,
everyone except those persons referred
to in section 104(c) of the Act shall be
withdrawn from the area affected to a
safe area until the hazardous condition
is corrected. Only persons designated
by the operator to correct or evaluate
the hazardous condition may enter the
posted area. Any violation of a mandatory health or safety standard found
during a preshift, supplemental, onshift, or weekly examination shall be
corrected.
(b) A record shall be made of any hazardous condition and any violation of
the nine mandatory health or safety
549
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00559
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.364
30 CFR Ch. I (7–1–19 Edition)
standards found by the mine examiner.
This record shall be kept in a book
maintained for this purpose on the surface at the mine. The record shall be
made by the completion of the shift on
which the hazardous condition or violation of the nine mandatory health or
safety standards is found and shall include the nature and location of the
hazardous condition or violation and
the corrective action taken. This
record shall not be required for shifts
when no hazardous conditions or violations of the nine mandatory health or
safety standards are found.
(c) The record shall be made by the
certified person who conducted the examination or a person designated by
the operator. If made by a person other
than the certified person, the certified
person shall verify the record by initials and date by or at the end of the
shift for which the examination was
made. Records shall be countersigned
by the mine foreman or equivalent
mine official by the end of the mine
foreman’s or equivalent mine official’s
next regularly scheduled working shift.
The record shall be made in a secure
book that is not susceptible to alteration or electronically in a computer
system so as to be secure and not susceptible to alteration.
(d) Retention period. Records shall be
retained at a surface location at the
mine for at least 1 year and shall be
made available for inspection by authorized representatives of the Secretary and the representative of miners.
(e) Review of citations and orders. The
mine operator shall review with mine
examiners on a quarterly basis citations and orders issued in areas where
preshift, supplemental, on-shift, and
weekly examinations are required.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 9829, Mar. 11, 1996; 61 FR 26442, May 28,
1996; 77 FR 20715, Apr. 6, 2012]
§ 75.364 Weekly examination.
(a) Worked-out areas. (1) At least
every 7 days, a certified person shall
examine unsealed worked-out areas
where no pillars have been recovered
by traveling to the area of deepest penetration; measuring methane and oxygen concentrations and air quantities
and making tests to determine if the
air is moving in the proper direction in
the area. The locations of measurement points where tests and measurements will be performed shall be included in the mine ventilation plan and
shall be adequate in number and location to assure ventilation and air quality in the area. Air quantity measurements shall also be made where the air
enters and leaves the worked-out area.
An alternative method of evaluating
the ventilation of the area may be approved in the ventilation plan.
(2) At least every 7 days, a certified
person shall evaluate the effectiveness
of bleeder systems required by § 75.334
as follows:
(i) Measurements of methane and oxygen concentrations and air quantity
and a test to determine if the air is
moving in its proper direction shall be
made where air enters the worked-out
area.
(ii) Measurements of methane and
oxygen concentrations and air quantity and a test to determine if the air
is moving in the proper direction shall
be made immediately before the air enters a return split of air.
(iii) At least one entry of each set of
bleeder entries used as part of a bleeder
system under § 75.334 shall be traveled
in its entirety. Measurements of methane and oxygen concentrations and air
quantities and a test to determine if
the air is moving in the proper direction shall be made at the measurement
point locations specified in the mine
ventilation plan to determine the effectiveness of the bleeder system.
(iv) In lieu of the requirements of
paragraphs (a)(2)(i) and (iii) of this section, an alternative method of evaluation may be specified in the ventilation
plan provided the alternative method
results in proper evaluation of the effectiveness of the bleeder system.
(b) Hazardous conditions and violations
of mandatory health or safety standards.
At least every 7 days, an examination
for hazardous conditions and violations
of the mandatory health or safety
standards referenced in paragraph
(b)(8) of this section shall be made by a
certified person designated by the operator at the following locations:
(1) In at least one entry of each intake air course, in its entirety, so that
the entire air course is traveled.
550
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00560
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.364
(2) In at least one entry of each return air course, in its entirety, so that
the entire air course is traveled.
(3) In each longwall or shortwall
travelway in its entirety, so that the
entire travelway is traveled.
(4) At each seal along return and
bleeder air courses and at each seal
along intake air courses not examined
under § 75.360(b)(5).
(5) In each escapeway so that the entire escapeway is traveled.
(6) On each working section not examined under § 75.360(b)(3) during the
previous 7 days.
(7) At each water pump not examined
during a preshift examination conducted during the previous 7 days.
(8) Weekly examinations shall include examinations to identify violations of the standards listed below:
(i) §§ 75.202(a) and 75.220(a)(1)—roof
control;
(ii) §§ 75.333(h) and 75.370(a)(1)—ventilation, methane;
(iii) §§ 75.400 and 75.403—accumulations of combustible materials and application of rock dust; and
(iv) § 75.1403—maintenance of off
track haulage roadways, and track
haulage, track switches, and other
components for haulage;
(v) § 75.1722(a)—guarding moving machine parts; and
(vi) § 75.1731(a)—maintenance of belt
conveyor components.
(c) Measurements and tests. At least
every 7 days, a certified person shall—
(1) Determine the volume of air entering the main intakes and in each intake split;
(2) Determine the volume of air and
test for methane in the last open crosscut in any pair or set of developing entries or rooms, in the return of each
split of air immediately before it enters the main returns, and where the
air leaves the main returns; and
(3) Test for methane in the return
entry nearest each set of seals immediately after the air passes the seals.
(d) Hazardous conditions shall be corrected immediately. If the condition
creates an imminent danger, everyone
except those persons referred to in section 104(c) of the Act shall be withdrawn from the area affected to a safe
area until the hazardous condition is
corrected. Any violation of the nine
mandatory health or safety standards
found during a weekly examination
shall be corrected.
(e) The weekly examination may be
conducted at the same time as the
preshift or on-shift examinations.
(f) (1) The weekly examination is not
required during any 7 day period in
which no one enters any underground
area of the mine.
(2) Except for certified persons required to make examinations, no one
shall enter any underground area of
the mine if a weekly examination has
not been completed within the previous
7 days.
(g) Certification. The person making
the weekly examinations shall certify
by initials, date, and the time that the
examination was made. Certifications
and times shall appear at enough locations to show that the entire area has
been examined.
(h) Recordkeeping. At the completion
of any shift during which a portion of a
weekly examination is conducted, a
record of the results of each weekly examination, including a record of hazardous conditions and violations of the
nine mandatory health or safety standards found during each examination
and their locations, the corrective action taken, and the results and location of air and methane measurements,
shall be made. The results of methane
tests shall be recorded as the percentage of methane measured by the examiner. The record shall be made by the
person making the examination or a
person designated by the operator. If
made by a person other than the examiner, the examiner shall verify the
record by initials and date by or at the
end of the shift for which the examination was made. The record shall be
countersigned by the mine foreman or
equivalent mine official by the end of
the mine foreman’s or equivalent mine
official’s next regularly scheduled
working shift. The records required by
this section shall be made in a secure
book that is not susceptible to alteration or electronically in a computer
system so as to be secure and not susceptible to alteration.
(i) Retention period. Records shall be
retained at a surface location at the
mine for at least 1 year and shall be
551
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00561
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.370
30 CFR Ch. I (7–1–19 Edition)
made available for inspection by authorized representatives of the Secretary and the representative of miners.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 9829, Mar. 11, 1996, as amended at 77
FR 20715, Apr. 6, 2012]
§ 75.370 Mine ventilation plan; submission and approval.
(a)(1) The operator shall develop and
follow a ventilation plan approved by
the district manager. The plan shall be
designed to control methane and respirable dust and shall be suitable to
the conditions and mining system at
the mine. The ventilation plan shall
consist of two parts, the plan content
as prescribed in § 75.371 and the ventilation map with information as prescribed in § 75.372. Only that portion of
the map which contains information
required under § 75.371 will be subject to
approval by the district manager.
(2) The proposed ventilation plan and
any revision to the plan shall be submitted in writing to the district manager. When revisions to a ventilation
plan are proposed, only the revised
pages, maps, or sketches of the plan
need to be submitted. When required in
writing by the district manager, the
operator shall submit a fully revised
plan by consolidating the plan and all
revisions in an orderly manner and by
deleting all outdated material.
(3) (i) The mine operator shall notify
the representative of miners at least 5
days prior to submission of a mine ventilation plan and any revision to a
mine ventilation plan. If requested, the
mine operator shall provide a copy to
the representative of miners at the
time of notification. In the event of a
situation requiring immediate action
on a plan revision, notification of the
revision shall be given, and if requested, a copy of the revision shall be
provided, to the representative of miners by the operator at the time of submittal;
(ii) A copy of the proposed ventilation plan, and a copy of any proposed
revision, submitted for approval shall
be made available for inspection by the
representative of miners; and
(iii) A copy of the proposed ventilation plan, and a copy of any proposed
revision, submitted for approval shall
be posted on the mine bulletin board at
the time of submittal. The proposed
plan or proposed revision shall remain
posted until it is approved, withdrawn
or denied.
(b) Following receipt of the proposed
plan or proposed revision, the representative of miners may submit
timely comments to the district manager, in writing, for consideration during the review process. A copy of these
comments shall also be provided to the
operator by the district manager upon
request.
(c) (1) The district manager will notify the operator in writing of the approval or denial of approval of a proposed ventilation plan or proposed revision. A copy of this notification will
be sent to the representative of miners
by the district manager.
(2) If the district manager denies approval of a proposed plan or revision,
the deficiencies of the plan or revision
shall be specified in writing and the operator will be provided an opportunity
to discuss the deficiencies with the district manager.
(d) No proposed ventilation plan shall
be implemented before it is approved
by the district manager. Any intentional change to the ventilation system that alters the main air current or
any split of the main air current in a
manner that could materially affect
the safety and health of the miners, or
any change to the information required
in § 75.371 shall be submitted to and approved by the district manager before
implementation.
(e) Before implementing an approved
ventilation plan or a revision to a ventilation plan, persons affected by the
revision shall be instructed by the operator in its provisions.
(f) The approved ventilation plan and
any revisions shall be—
(1) Provided upon request to the representative of miners by the operator
following notification of approval;
(2) Made available for inspection by
the representative of miners; and
(3) Posted on the mine bulletin board
within 1 working day following notification of approval. The approved plan
and revisions shall remain posted on
the bulletin board for the period that
they are in effect.
(g) The ventilation plan for each
mine shall be reviewed every 6 months
552
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00562
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.371
by an authorized representative of the
Secretary to assure that it is suitable
to current conditions in the mine.
(2) The maximum distance that ventilation control devices will be installed from each working face when
mining or installing roof bolts in entries and crosscuts;
(3) Procedures for maintaining the
roof bolting machine dust collection
system in approved condition; and
(4) Recommended best work practices
for equipment operators to minimize
dust exposure.
(g) Locations where the air quantities must be greater than 3,000 cubic
feet per minute (see § 75.325(a)(1)).
(h) In anthracite mines, locations
where the air quantities must be greater than 1,500 cubic feet per minute (see
§ 75.325(e)(1)).
(i) Working places and working faces
other than those where coal is being
cut, mined, drilled for blasting or loaded, where a minimum air quantity will
be maintained, and the air quantity at
those locations (see § 75.325(a)(1)).
(j) The operating volume of machine
mounted dust collectors or diffuser
fans, if used (see § 75.325(a)(3)), including the type and size of dust collector
screen used, and a description of the
procedures to maintain dust collectors
used on equipment.
(k) The minimum mean entry air velocity in exhausting face ventilation
systems where coal is being cut, mined,
drilled for blasting, or loaded, if the velocity will be less than 60 feet per
minute. Other working places where
coal is not being cut, mined, drilled for
blasting or loaded, where at least 60
feet per minute or some other minimum mean entry air velocity will be
maintained (see § 75.326).
(l) The maximum distance if greater
than 10 feet from each working face at
which face ventilation control devices
will be installed (see § 75.330(b)(2)). The
working places other than those where
coal is being cut, mined, drilled for
blasting or loaded, where face ventilation control devices will be used (see
§ 75.330(b)(1)(ii).
(m) The volume of air required in the
last open crosscut or the quantity of
air reaching the pillar line if greater
than 9,000 cubic feet per minute (see
§ 75.325(b)).
(n) In anthracite mines, the volume
of air required in the last open crosscut
kpayne on VMOFRWIN702 with $$_JOB
§ 75.371 Mine
tents.
ventilation
plan;
con-
The mine ventilation plan shall contain the information described below
and any additional provisions required
by the district manager:
(a) The mine name, company name,
mine identification number, and the
name of the individual submitting the
plan information.
(b) Planned main mine fan stoppages,
other than those scheduled for testing,
maintenance or adjustment, including
procedures to be followed during these
stoppages and subsequent restarts (see
§ 75.311(a)) and the type of device to be
used for monitoring main mine fan
pressure, if other than a pressure recording device (see 75.310(a)(4)).
(c) Methods of protecting main mine
fans and associated components from
the forces of an underground explosion
if a 15-foot offset from the nearest side
of the mine opening is not provided
(see § 75.310(a)(6)); and the methods of
protecting main mine fans and intake
air openings if combustible material
will be within 100 feet of the area surrounding the fan or these openings (see
§ 75.311(f)).
(d) Persons that will be permitted to
enter the mine, the work these persons
will do while in the mine, and electric
power circuits that will be energized
when a back-up fan system is used that
does not provide the ventilating quantity provided by the main mine fan (see
§ 75.311(c)).
(e) The locations and operating conditions of booster fans installed in anthracite mines (see § 75.302).
(f) Section and face ventilation systems used and the minimum quantity
of air that will be delivered to the
working section for each mechanized
mining unit, including drawings illustrating how each system is used, and a
description of each different dust suppression system used on equipment,
identified by make and model, on each
working section, including:
(1) The number, types, location, orientation, operating pressure, and flow
rate of operating water sprays;
553
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00563
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.371
30 CFR Ch. I (7–1–19 Edition)
or the quantity of air reaching the pillar line if greater than 5,000 cubic feet
per minute (see § 75.325(e)(2)).
(o) Locations where separations of intake and return air courses will be
built and maintained to other than the
third connecting crosscut outby each
working face (see § 75.333(b)(1)).
(p) The volume of air required at the
intake to the longwall sections, if different than 30,000 cubic feet per minute
(see § 75.325(c)).
(q) The velocities of air on a longwall
or shortwall face, and the locations
where the velocities must be measured
(see § 75.325(c)(2)).
(r) The minimum quantity of air that
will be provided during the installation
and removal of mechanized mining
equipment, the location where this
quantity will be provided, and the ventilation controls that will be used (see
§ 75.325(d), (g), and (i)).
(s) The locations and frequency of the
methane tests if required more often
by
§ 75.362(d)(1)(iii)
(see
§ 75.362
(d)(1)(iii).
(t) The locations where samples for
‘‘designated areas’’ will be collected,
including the specific location of each
sampling device, and the respirable
dust control measures used at the dust
generating sources for these locations
(see §§ 70.207 and 70.209 of this chapter).
(u) The methane and dust control
systems
at
underground
dumps,
crushers,
transfer
points,
and
haulageways.
(v) Areas in trolley haulage entries
where the air velocity will be greater
than 250 feet per minute and the velocity in these areas (see § 75.327(b)).
(w) Locations where entries will be
advanced less than 20 feet from the
inby rib without a crosscut being provided where a line brattice will be required. (see § 75.333(g)).
(x) A description of the bleeder system to be used, including its design
(see § 75.334).
(y) The means for determining the effectiveness of bleeder systems (see
§ 75.334(c)(2)).
(z) The locations where measurements of methane and oxygen concentrations and air quantities and
tests to determine whether the air is
moving in the proper direction will be
made to evaluate the ventilation of
nonpillared worked-out areas (see
§ 75.364 (a)(1)) and the effectiveness of
bleeder systems (see § 75.364 (a)(2)(iii).
Alternative methods of evaluation of
the effectiveness of bleeder systems
(§ 75.364 (a)(2)(iv)).
(aa) The means for adequately maintaining bleeder entries free of obstructions such as roof falls and standing
water (see § 75.334(c)(3)).
(bb) The location of ventilation devices such as regulators, stoppings and
bleeder connectors used to control air
movement through worked-out areas
(see § 75.334(c)(4)). The location and sequence of construction of proposed
seals for each worked-out area. (see
§ 75.334(e)).
(cc) In mines with a demonstrated
history of spontaneous combustion: a
description of the measures that will
be used to detect methane, carbon
monoxide, and oxygen concentration
during and after pillar recovery and in
worked-out areas where no pillars have
been recovered (see § 75.334(f)(1); and,
the actions which will be taken to protect miners from the hazards associated with spontaneous combustion (see
§ 75.334(f)(2). If a bleeder system will
not be used, the methods that will be
used to control spontaneous combustion, accumulations of methane-air
mixtures, and other gases, dusts, and
fumes in the worked-out area (see
§ 75.334(f)(3)).
(dd) The location of all horizontal
degasification holes that are longer
than 1,000 feet and the location of all
vertical degasification holes.
(ee) If methane drainage systems are
used, a detailed sketch of each system,
including a description of safety precautions used with the systems.
(ff) Seal installation requirements
provided by § 75.335 and the sampling
provisions provided by § 75.336.
(gg) The alternative location for the
additional sensing device if the device
will not be installed on the longwall
shearing machine (see § 75.342(a)(2)).
(hh) The ambient level in parts per
million of carbon monoxide, and the
method for determining the ambient
level, in all areas where carbon monoxide sensors are installed.
(ii) The locations (designated areas)
where dust measurements would be
made in the belt entry when belt air is
554
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00564
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.372
used to ventilate working sections or
areas where mechanized mining equipment is being installed or removed, in
accordance with § 75.350(b)(3).
(jj) The locations and approved velocities at those locations where air velocities in the belt entry are above or
below
the
limits
set
forth
in
§ 75.350(a)(2)
or
§§ 75.350(b)(7)
and
75.350(b)(8).
(kk) The locations where air quantities are measured as set forth in
§ 75.350(b)(6).
(ll) The locations and use of pointfeed regulators, in accordance with
§§ 75.350(c) and 75.350(d)(5).
(mm) The location of any diesel-discriminating sensor, and additional carbon monoxide or smoke sensors installed in the belt air course.
(nn) The length of the time delay or
any other method used to reduce the
number of non-fire related alert and
alarm signals from carbon monoxide
sensors.
(oo) The reduced alert and alarm settings for carbon monoxide sensors, in
accordance with § 75.351(i)(2).
(pp) The alternate detector and the
alert and alarm levels associated with
the detector, in accordance with
§ 75.352(e)(7).
(qq) The distance that separation between the primary escapeway and the
belt or track haulage entries will be
maintained if other than to the first
connecting crosscut outby the section
loading point (see § 75.380(g)).
(rr) In anthracite mines, the dimensions of escapeways where the pitch of
the coal seam does not permit
escapeways to be maintained 4 feet by
5 feet and the locations where these dimensions must be maintained (see
§ 75.381(c)(4)).
(ss) Areas designated by the district
manager where measurements of CO
and NO2 concentrations will be made
(see § 70.1900(a)(4)).
(tt) Location where the air quantity
will be maintained at the section loading point (see § 75.325(f)(2)).
(uu) Any additional location(s) required by the district manager where a
minimum air quantity must be maintained for an individual unit of dieselpowered equipment. (see § 75.325(f)(5)).
(vv) The minimum air quantities
that will be provided where multiple
units of diesel-powered equipment are
operated (see § 75.325(g) (1)–(3) and (i)).
(ww) The diesel-powered mining
equipment excluded from the calculation under § 75.325(g). (see § 75.325(h)).
(xx) Action levels higher than the 50
percent level specified by § 70.1900(c).
(see § 75.325(j)).
(yy) The locations where the pressure
differential cannot be maintained from
the primary escapeway to the belt
entry.
[61 FR 9829, Mar. 11, 1996, as amended at 61
FR 55527, Oct. 25, 1996; 69 FR 17529, Apr. 2,
2004; 72 FR 28817, May 22, 2007; 73 FR 21209,
Apr. 18, 2008; 73 FR 80613, Dec. 31, 2008; 79 FR
24987, May 1, 2014]
§ 75.372
Mine ventilation map.
(a)(1) At intervals not exceeding 12
months, the operator shall submit to
the district manager 3 copies of an upto-date map of the mine drawn to a
scale of not less than 100 nor more than
500 feet to the inch. A registered engineer or a registered surveyor shall certify that the map is accurate.
(2) In addition to the informational
requirements of this section the map
may also be used to depict and explain
plan contents that are required in
§ 75.371. Information shown on the map
to satisfy the requirements of § 75.371
shall be subject to approval by the district manager.
(b) The map shall contain the following information:
(1) The mine name, company name,
mine identification number, a legend
identifying the scale of the map and
symbols used, and the name of the individual responsible for the information
on the map.
(2) All areas of the mine, including
sealed and unsealed worked-out areas.
(3) All known mine workings that are
located in the same coalbed within
1,000 feet of existing or projected workings. These workings may be shown on
a mine map with a scale other than
that required by paragraph (a) of this
section, if the scale does not exceed
2,000 feet to the inch and is specified on
the map.
(4) The locations of all known mine
workings underlying and overlying the
mine property and the distance between the mine workings.
555
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00565
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.373
30 CFR Ch. I (7–1–19 Edition)
(5) The locations of all known oil and
gas wells and all known drill holes that
penetrate the coalbed being mined.
(6) The locations of all main mine
fans, installed backup fans and motors,
and each fan’s specifications, including
size, type, model number, manufacturer, operating pressure, motor horsepower, and revolutions per minute.
(7) The locations of all surface mine
openings and the direction and quantity of air at each opening.
(8) The elevation at the top and bottom of each shaft and slope, and shaft
and slope dimensions, including depth
and length.
(9) The direction of air flow in all underground areas of the mine.
(10) The locations of all active working sections and the four-digit identification number for each mechanized
mining unit (MMU).
(11) The location of all escapeways
and refuge alternatives.
(12) The locations of all ventilation
controls,
including
permanent
stoppings, overcasts, undercasts, regulators, seals, airlock doors, haulageway
doors and other doors, except temporary ventilation controls on working
sections.
(13) The direction and quantity of
air—
(i) Entering and leaving each split;
(ii) In the last open crosscut of each
set of entries and rooms; and
(iii) At the intake end of each pillar
line,
including
any
longwall
or
shortwall.
(14) Projections for at least 12
months of anticipated mine development, proposed ventilation controls,
proposed bleeder systems, and the anticipated location of intake and return
air
courses,
belt
entries,
and
escapeways.
(15) The locations of existing methane drainage systems.
(16) The locations and type of all
AMS sensors required by subpart D of
this part.
(17) Contour lines that pass through
whole number elevations of the coalbed
being mined. These lines shall be
spaced at 10-foot elevation levels unless a wider spacing is permitted by the
district manager.
(18) The location of proposed seals for
each worked-out area.
(19) The entry height, velocity and
direction of the air current at or near
the midpoint of each belt flight where
the height and width of the entry are
representative of the belt haulage
entry.
(20) The location and designation of
air courses that have been redesignated
from intake to return for the purpose
of ventilation of structures, areas or
installations that are required by this
subpart D to be ventilated to return air
courses, and for ventilation of seals.
(c) The mine map required by § 75.1200
may be used to satisfy the requirements for the ventilation map, provided that all the information required
by this section is contained on the
map.
[61 FR 9829, Mar. 11, 1996, as amended at 69
FR 17530, Apr. 2, 2004; 73 FR 80697, Dec. 31,
2008]
§ 75.373 Reopening mines.
After a mine is abandoned or declared inactive, and before it is reopened, mining operations shall not
begin until MSHA has been notified
and has completed an inspection.
§ 75.380 Escapeways; bituminous and
lignite mines.
(a) Except in situations addressed in
§ 75.381, § 75.385 and § 75.386, at least two
separate and distinct travelable passageways shall be designated as
escapeways and shall meet the requirements of this section.
(b) (1) Escapeways shall be provided
from each working section, and each
area where mechanized mining equipment is being installed or removed,
continuous to the surface escape drift
opening or continuous to the escape
shaft or slope facilities to the surface.
(2) During equipment installation,
these escapeways shall begin at the
projected location for the section loading point. During equipment removal,
they shall begin at the location of the
last loading point.
(c) The two separate and distinct
escapeways required by this section
shall not end at a common shaft, slope,
or drift opening, except that multiple
compartment shafts or slopes separated by walls constructed of noncombustible material may be used as
separate and distinct passageways.
556
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00566
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.380
(d) Each escapeway shall be—
(1) Maintained in a safe condition to
always assure passage of anyone, including disabled persons;
(2) Clearly marked to show the route
and direction of travel to the surface;
(3) Maintained to at least a height of
5 feet from the mine floor to the mine
roof, excluding the thickness of any
roof
support,
except
that
the
escapeways shall be maintained to at
least the height of the coalbed, excluding the thickness of any roof support,
where the coalbed is less than 5 feet. In
areas of mines where escapeways pass
through doors, the height may be less
than 5 feet, provided that sufficient
height is maintained to enable miners,
including disabled persons, to escape
quickly in an emergency. In areas of
mines developed before November 16,
1992, where escapeways pass over or
under overcasts or undercasts, the
height may be less than 5 feet provided
that sufficient height is maintained to
enable miners, including disabled persons, to escape quickly in an emergency. When there is a need to determine whether sufficient height is provided, MSHA may require a stretcher
test where 4 persons carry a miner
through the area in question on a
stretcher;
(4) Maintained at least 6 feet wide except—
(i) Where necessary supplemental
roof support is installed, the escapeway
shall not be less than 4 feet wide; or
(ii) Where the route of travel passes
through doors or other permanent ventilation controls, the escapeway shall
be at least 4 feet wide to enable miners
to escape quickly in an emergency, or
(iii) Where the alternate escapeway
passes through doors or other permanent ventilation controls or where supplemental roof support is required and
sufficient width is maintained to enable miners, including disabled persons, to escape quickly in an emergency. When there is a need to determine whether sufficient width is provided, MSHA may require a stretcher
test where 4 persons carry a miner
through the area in question on a
stretcher, or
(iv) Where mobile equipment near
working sections, and other equipment
essential to the ongoing operation of
longwall sections, is necessary during
normal mining operations, such as material cars containing rock dust or roof
control supplies, or is to be used for the
evacuation of miners off the section in
the event of an emergency. In any instance, escapeways shall be of sufficient width to enable miners, including
disabled persons, to escape quickly in
an emergency. When there is a need to
determine whether sufficient width is
provided, MSHA may require a stretcher test where 4 persons carry a miner
through the area in question on a
stretcher;
(5) Located to follow the most direct,
safe and practical route to the nearest
mine opening suitable for the safe
evacuation of miners; and
(6) Provided with ladders, stairways,
ramps, or similar facilities where the
escapeways cross over obstructions.
(7) Provided with a continuous, durable directional lifeline or equivalent
device that shall be—
(i) Installed and maintained throughout the entire length of each
escapeway as defined in paragraph
(b)(1) of this section;
(ii) Flame-resistant in accordance
with the requirements of part 18 of this
chapter upon replacement of existing
lifelines; but in no case later than June
15, 2009;
(iii) Marked with a reflective material every 25 feet;
(iv) Located in such a manner for
miners to use effectively to escape;
(v) Equipped with one directional indicator cone securely attached to the
lifeline, signifying the route of escape,
placed at intervals not exceeding 100
feet. Cones shall be installed so that
the tapered section points inby;
(vi) Equipped with one sphere securely attached to the lifeline at each
intersection where personnel doors are
installed in adjacent crosscuts;
(vii) Equipped with two securely attached cones, installed consecutively
with the tapered section pointing inby,
to signify an attached branch line is
immediately ahead.
(A) A branch line leading from the
lifeline to an SCSR cache will be
marked with four cones with the base
sections in contact to form two diamond shapes. The cones must be placed
within reach of the lifeline.
557
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00567
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
30 CFR Ch. I (7–1–19 Edition)
(B) A branch line leading from the
lifeline to a refuge alternative will be
marked with a rigid spiraled coil at
least eight inches in length. The spiraled coil must be placed within reach
of the lifeline (see Illustration 1 below).
(e) Surface openings shall be adequately protected to prevent surface
fires, fumes, smoke, and flood water
from entering the mine.
(f) Primary escapeway. (1) One
escapeway that is ventilated with intake air shall be designated as the primary
escapeway.
The
primary
escapeway shall have a higher ventilation pressure than the belt entry unless the mine operator submits an alternative in the mine ventilation plan
to protect the integrity of the primary
escapeway, based on mine specific conditions, which is approved by the district manager.
(2) Paragraphs (f)(3) through (f)(7) of
this section apply as follows:
(i) To all areas of a primary
escapeway developed on or after November 16, 1992;
(ii) Effective as of June 10, 1997, to all
areas of a primary escapeway developed between March 30, 1970 and November 16, 1992; and
(iii) Effective as of June 10, 1997, to
all areas of the primary escapeway developed prior to March 30, 1970 where
separation of the belt and trolley haulage
entries
from
the
primary
escapeway existed prior to November
16, 1992.
(3) The following equipment is not
permitted in the primary escapeway:
(i) Mobile equipment hauling coal except for hauling coal incidental to
558
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00568
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
ER31DE08.001
kpayne on VMOFRWIN702 with $$_JOB
§ 75.380
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.380
cleanup or maintenance of the primary
escapeway.
(ii) Compressors, except—
(A) Compressors necessary to maintain the escapeway in safe, travelable
condition;
(B) Compressors that are components
of equipment such as locomotives and
rock dusting machines; and
(C) Compressors of less than five
horsepower.
(iii) Underground transformer stations, battery charging stations, substations, and rectifiers except—
(A) Where necessary to maintain the
escapeway in safe, travelable condition; and
(B) Battery charging stations and
rectifiers and power centers with transformers that are either dry-type or
contain nonflammable liquid, provided
they are located on or near a working
section and are moved as the section
advances or retreats.
(iv) Water pumps, except—
(A) Water pumps necessary to maintain the escapeway in safe, travelable
condition;
(B) Submersible pumps;
(C) Permissible pumps and associated
permissible switchgear;
(D) Pumps located on or near a working section that are moved as the section advances or retreats;
(E) Pumps installed in anthracite
mines; and
(F) Small portable pumps.
(4) Mobile equipment operated in the
primary escapeway, except for continuous miners and as provided in paragraphs (f)(5), (f)(6), and (f)(7) of this section, shall be equipped with a fire suppression system installed according to
§§ 75.1107–3 through 75.1107–16 that is—
(i) Manually operated and attended
continuously by a person trained in the
systems function and use, or
(ii) A multipurpose dry chemical
type capable of both automatic and
manual activation.
(5) Personnel carriers and small mobile equipment designed and used only
for carrying people and small hand
tools may be operated in primary
escapeways if—
(i) The equipment is provided with a
multipurpose dry chemical type fire
suppression system capable of both
automatic and manual activation, and
the suppression system is suitable for
the intended application and is listed
or approved by a nationally recognized
independent testing laboratory, or,
(ii) Battery powered and provided
with two 10 pound multipurpose dry
chemical portable fire extinguishers.
(6) Notwithstanding the requirements
of paragraph (f)(3)(i), mobile equipment
not provided with a fire suppression
system may operate in the primary
escapeway if no one is inby except
those persons directly engaged in using
or moving the equipment.
(7) Notwithstanding the requirements
of paragraph (f)(3)(i), mobile equipment
designated and used only as emergency
vehicles or ambulances, may be operated in the primary escapeway without
fire suppression systems.
(g) Except where separation of belt
and trolley haulage entries from designated escapeways did not exist before
November 15, 1992, and except as provided in § 75.350(c), the primary
escapeway must be separated from belt
and trolley haulage entries for its entire length, to and including the first
connecting crosscut outby each loading
point except when a greater or lesser
distance for this separation is specified
and approved in the mine ventilation
plan and does not pose a hazard to miners.
(h)
Alternate
escapeway.
One
escapeway shall be designated as the
alternate escapeway. The alternate
escapeway shall be separated from the
primary escapeway for its entire
length, except that the alternate and
primary escapeways may be ventilated
from a common intake air shaft or
slope opening.
(i) Mechanical escape facilities shall
be provided and maintained for—
(1) Each shaft that is part of a designated escapeway and is greater than
50 feet in depth; and
(2) Each slope from the coal seam to
the surface that is part of a designated
escapeway and is inclined more than 9
degrees from the horizontal.
(j) Within 30 minutes after mine personnel on the surface have been notified of an emergency requiring evacuation, mechanical escape facilities provided under paragraph (i) of this section shall be operational at the bottom
559
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00569
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.381
30 CFR Ch. I (7–1–19 Edition)
of shaft and slope openings that are
part of escapeways.
(k) Except where automatically activated hoisting equipment is used, the
bottom of each shaft or slope opening
that is part of a designated escapeway
shall be equipped with a means of signaling a surface location where a person is always on duty when anyone is
underground. When the signal is activated or the evacuation of persons underground is necessary, the person
shall assure that mechanical escape facilities are operational as required by
paragraph (j) of this section.
(l)(1) Stairways or mechanical escape
facilities shall be installed in shafts
that are part of the designated
escapeways and that are 50 feet or less
in depth, except ladders may be used in
shafts that are part of the designated
escapeways and that are 5 feet or less
in depth.
(2) Stairways shall be constructed of
concrete or metal, set on an angle not
to exceed 45 degrees from the horizontal, and equipped on the open side
with handrails. In addition, landing
platforms that are at least 2 feet by 4
feet shall be installed at intervals not
to exceed 20 vertical feet on the stairways and equipped on the open side
with handrails.
(3) Ladders shall be constructed of
metal, anchored securely, and set on an
angle not to exceed 60 degrees from the
horizontal.
(m) A travelway designed to prevent
slippage shall be provided in slope and
drift openings that are part of designated escapeways, unless mechanical
escape facilities are installed.
[61 FR 9829, Mar. 11, 1996; 61 FR 20877, May 8,
1996, as amended at 61 FR 55527, Oct. 25, 1996;
69 FR 17530, Apr. 2, 2004; 71 FR 12269, Mar. 9,
2006; 71 FR 71452, Dec. 8, 2006; 73 FR 80613,
Dec. 31, 2008]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.381
Escapeways; anthracite mines.
(a) Except as provided in §§ 75.385 and
75.386, at least two separate and distinct travelable passageways shall be
designated as escapeways and shall
meet the requirements of this section.
(b) Escapeways shall be provided
from each working section continuous
to the surface.
(c) Each escapeway shall be—
(1) Maintained in a safe condition to
always assure passage of anyone, including disabled persons;
(2) Clearly marked to show the route
of travel to the surface;
(3) Provided with ladders, stairways,
ramps, or similar facilities where the
escapeways cross over obstructions;
and
(4) Maintained at least 4 feet wide by
5 feet high. If the pitch or thickness of
the coal seam does not permit these dimensions to be maintained other dimensions may be approved in the ventilation plan.
(5) Provided with a continuous, durable directional lifeline or equivalent
device that shall be—
(i) Installed and maintained throughout the entire length of each
escapeway as defined in paragraph (b)
of this section;
(ii) Flame-resistant in accordance
with the requirements of part 18 of this
chapter upon replacement of existing
lifelines; but in no case later than June
15, 2009;
(iii) Marked with a reflective material every 25 feet;
(iv) Located in such a manner for
miners to use effectively to escape;
(v) Equipped with one directional indicator cone securely attached to the
lifeline, signifying the route of escape,
placed at intervals not exceeding 100
feet. Cones shall be installed so that
the tapered section points inby;
(vi) Equipped with one sphere securely attached to the lifeline at each
intersection where personnel doors are
installed in adjacent crosscuts;
(vii) Equipped with two securely attached cones, installed consecutively
with the tapered section pointing inby,
to signify an attached branch line is
immediately ahead.
(A) A branch line leading from the
lifeline to an SCSR cache will be
marked with four cones with the base
sections in contact to form two diamond shapes. The cones must be placed
within reach of the lifeline.
(B) A branch line leading from the
lifeline to a refuge alternative will be
marked with a rigid spiraled coil at
least eight inches in length. The spiraled coil must be placed within reach
of the lifeline.
560
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00570
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.384
(d) Surface openings shall be adequately protected to prevent surface
fires, fumes, smoke, and flood water
from entering the mine.
(e) Primary escapeway. One escapeway
that shall be ventilated with intake air
shall be designated as the primary
escapeway. The primary escapeway
shall have a higher ventilation pressure than the belt entry unless the
mine operator submits an alternative
in the mine ventilation plan to protect
the
integrity
of
the
primary
escapeway, based on mine specific conditions, which is approved by the district manager.
(f)
Alternate
escapeway.
One
escapeway that shall be designated as
the alternate escapeway shall be separated from the primary escapeway for
its entire length.
(g) Mechanical escape facilities shall
be provided—
(1) For each shaft or slope opening
that is part of a primary escapeway;
and
(2) For slopes that are part of
escapeways, unless ladders are installed.
(h) Within 30 minutes after mine personnel on the surface have been notified of an emergency requiring evacuation, mechanical escape facilities
shall be operational at the bottom of
each shaft and slope opening that is
part of an escapeway.
(i) Except where automatically activated hoisting equipment is used, the
bottom of each shaft or slope opening
that is part of a primary escapeway
shall be equipped with a means of signaling a surface location where a person is always on duty when anyone is
underground. When the signal is activated or the evacuation of personnel is
necessary, the person on duty shall assure that mechanical escape facilities
are operational as required by paragraph (h) of this section.
shall be equipped with brakes that can
stop the fully loaded platform, cage, or
other device.
(c) Mechanical escape facilities, including automatic elevators, shall be
examined weekly. The weekly examination of this equipment may be conducted at the same time as a daily examination required by § 75.1400–3.
(1) The weekly examination shall include an examination of the headgear,
connections, links and chains, overspeed and overwind controls, automatic stop controls, and other facilities.
(2) At least once each week, the hoist
shall be run through one complete
cycle of operation to determine that it
is operating properly.
(d) A person trained to operate the
mechanical escape facility always shall
be available while anyone is underground to provide the mechanical escape facilities, if required, to the bottom of each shaft and slope opening
that is part of an escapeway within 30
minutes after personnel on the surface
have been notified of an emergency requiring evacuation. However, no operator is required for automatically operated cages, platforms, or elevators.
(e) Mechanical escape facilities shall
have rated capacities consistent with
the loads handled.
(f) Manually-operated mechanical escape facilities shall be equipped with
indicators that accurately and reliably
show the position of the facility.
(g) Certification. The person making
the examination as required by paragraph (c) of this section shall certify by
initials, date, and the time that the examination was made. Certifications
shall be made at or near the facility examined.
[61 FR 9829, Mar. 11, 1996, as amended at 71
FR 12269, Mar. 9, 2006; 71 FR 71452, Dec. 8,
2006; 73 FR 80614, Dec. 31, 2008]
(a) If longwall or shortwall mining
systems are used and the two designated escapeways required by § 75.380
are located on the headgate side of the
longwall or shortwall, a travelway
shall be provided on the tailgate side of
that longwall or shortwall. The
travelway shall be located to follow the
most direct and safe practical route to
a designated escapeway.
§ 75.382 Mechanical escape facilities.
(a) Mechanical escape facilities shall
be provided with overspeed, overwind,
and automatic stop controls.
(b) Every mechanical escape facility
with a platform, cage, or other device
§ 75.384 Longwall
travelways.
and
561
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00571
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
shortwall
§ 75.385
30 CFR Ch. I (7–1–19 Edition)
(b) The route of travel shall be clearly marked.
(c) When a roof fall or other blockage
occurs that prevents travel in the
travelway—
(1) Work shall cease on the longwall
or shortwall face;
(2) Miners shall be withdrawn from
face areas to a safe area outby the section loading point; and
(3) MSHA shall be notified.
(d) Work may resume on the longwall
or shortwall face after the procedures
set out in §§ 75.215 and 75.222 are implemented.
§ 75.385
Opening new mines.
When new mines are opened, no more
than 20 miners at a time shall be allowed in any mine until a connection
has been made between the mine openings, and these connections shall be
made as soon as possible.
§ 75.386
Final mining of pillars.
When only one mine opening is available due to final mining of pillars, no
more than 20 miners at a time shall be
allowed in the mine, and the distance
between the mine opening and working
face shall not exceed 500 feet.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.388 Boreholes in advance of mining.
(a) Boreholes shall be drilled in each
advancing working place when the
working place approaches—
(1) To within 50 feet of any area located in the mine as shown by surveys
that are certified by a registered engineer or registered surveyor unless the
area has been preshift examined;
(2) To within 200 feet of any area located in the mine not shown by surveys
that are certified by a registered engineer or registered surveyor unless the
area has been preshift examined; or
(3) To within 200 feet of any mine
workings of an adjacent mine located
in the same coalbed unless the mine
workings have been preshift examined.
(b) Boreholes shall be drilled as follows:
(1) Into the working face, parallel to
the rib, and within 3 feet of each rib.
(2) Into the working face, parallel to
the rib, and at intervals across the face
not to exceed 8 feet.
(3) At least 20 feet in depth in advance of the working face, and always
maintained to a distance of 10 feet in
advance of the working face.
(c) Boreholes shall be drilled in both
ribs of advancing working places described in paragraph (a) of this section
unless an alternative drilling plan is
approved by the District Manager in
accordance with paragraph (g) of this
section. These boreholes shall be
drilled—
(1) At an angle of 45 degrees to the direction of advance;
(2) At least 20 feet in depth; and
(3) At intervals not to exceed 8 feet.
(d) When a borehole penetrates an
area that cannot be examined, and before mining continues, a certified person shall, if possible, determine—
(1) The direction of airflow in the
borehole;
(2) The pressure differential between
the penetrated area and the mine
workings;
(3) The concentrations of methane,
oxygen, carbon monoxide, and carbon
dioxide; and
(4) Whether water is impounded within the penetrated area.
(e) Unless action is taken to dewater
or to ventilate penetrated areas,
boreholes shall be plugged with wooden
plugs or similar devices when—
(1) Tests conducted at the boreholes
show that the atmosphere in the penetrated area contains more than 1.0 percent methane, less than 19.5 percent
oxygen, or harmful concentrations of
carbon monoxide, carbon dioxide or
other explosive, harmful or noxious
gases;
(2) Tests for methane, oxygen, carbon
monoxide, and carbon dioxide cannot
be made because air from mine workings is flowing into the penetrated
area; or
(3) Water is discharging through the
boreholes from the penetrated area
into the mine workings.
(f) If mining is to be conducted within 50 feet above or below an inaccessible area of another mine, boreholes
shall be drilled, as necessary, according
to a plan approved by the district manager.
(g) Alternative borehole patterns
that provide the same protection to
miners as the pattern established by
562
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00572
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.401–1
paragraphs (b) and (c) of this section
may be used under a plan approved by
the district manager.
Subpart E—Combustible Materials
and Rock Dusting
§ 75.389
Mining into inaccessible areas.
kpayne on VMOFRWIN702 with $$_JOB
(a) (1) The operator shall develop and
follow a plan for mining into areas penetrated by boreholes drilled under
§ 75.388.
(2) Mining shall not resume into any
area penetrated by boreholes until conditions in the penetrated area can be
determined under § 75.388 and the plan
for mining-through into the area has
been approved by the district manager.
(3) A copy of the procedures to be followed shall be posted near the site of
the mining-through operations and the
operator shall explain these procedures
to all miners involved in the operations.
(b) The procedures specified in the
plan shall include—
(1) The method of ventilation, ventilation controls, and the air quantities
and velocities in the affected working
section and working place;
(2) Dewatering procedures to be used
if a penetrated area contains a water
accumulation; and
(3) The procedures and precautions to
be followed during mining-through operations.
(c) Except for routine miningthrough operations that are part of a
retreat section ventilation system approved in accordance with § 75.371(f)
and (x), the following provisions shall
apply:
(1) Before and during mining-through
operations, a certified person shall perform air quality tests at intervals and
at locations necessary to protect the
safety of the miners.
(2) During mining-through operations, only persons involved in these
operations shall be permitted in the
mine; and
(3) After mining-through, a certified
person shall determine that the affected areas are safe before any persons
enter the underground areas of the
mine.
§ 75.400 Accumulation of combustible
materials.
Coal dust, including float coal dust
deposited on rock-dusted surfaces,
loose coal, and other combustible materials, shall be cleaned up and not be
permitted to accumulate in active
workings, or on diesel-powered and
electric equipment therein.
[61 FR 55527, Oct. 25, 1996]
§ 75.400–1 Definitions.
(a) The term coal dust means particles of coal that can pass a No. 20
sieve.
(b) The term float coal dust means the
coal dust consisting of particles of coal
that can pass a No. 200 sieve.
(c) The term loose coal means coal
fragments larger in size than coal dust.
§ 75.400–2 Cleanup program.
A program for regular cleanup and
removal of accumulations of coal and
float coal dusts, loose coal, and other
combustibles shall be established and
maintained. Such program shall be
available to the Secretary or authorized representative.
§ 75.401 Abatement of dust; water or
water with a wetting agent.
[STATUTORY PROVISION]
Where underground mining operations in active workings create or
raise excessive amounts of dust, water
or water with a wetting agent added to
it, or other no less effective methods
approved by the Secretary or his authorized representative, shall be used
to abate such dust. In working places,
particularly in distances less than 40
feet from the face, water, with or without a wetting agent, or other no less effective methods approved by the Secretary or his authorized representative,
shall be applied to coal dust on the
ribs, roof, and floor to reduce
dispersibility and to minimize the explosion hazard.
§ 75.401–1 Excessive amounts of dust.
The term ‘‘excessive amounts of
dust’’ means coal and float coal dust in
563
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00573
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.402
30 CFR Ch. I (7–1–19 Edition)
the air in such amounts as to create
the potential of an explosion hazard.
§ 75.402
Rock dusting.
All underground areas of a coal mine,
except those areas in which the dust is
too wet or too high in incombustible
content to propagate an explosion,
shall be rock dusted to within 40 feet of
all working faces, unless such areas are
inaccessible or unsafe to enter or unless the Secretary or his authorized
representative permits an exception
upon his finding that such exception
will not pose a hazard to the miners.
All crosscuts that are less than 40 feet
from a working face shall also be rock
dusted.
§ 75.402–1
Definition.
The term too wet means that sufficient natural moisture is retained by
the dust that when a ball of finely divided material is squeezed in the hands
water is exuded.
§ 75.402–2
Exceptions.
Exceptions granted under § 75.402 by
the Secretary or his authorized representative shall be reviewed periodically.
§ 75.403 Maintenance of incombustible
content of rock dust.
Where rock dust is required to be applied, it shall be distributed upon the
top, floor, and sides of all underground
areas of a coal mine and maintained in
such quantities that the incombustible
content of the combined coal dust,
rock dust, and other dust shall be not
less than 80 percent. Where methane is
present in any ventilating current, the
percent of incombustible content of
such combined dust shall be increased
0.4 percent for each 0.1 percent of methane.
[75 FR 57857, Sept. 23, 2010; 76 FR 35978, June
21, 2011]
§ 75.403–1
of
Incombustible content.
Moisture contained in the combined
coal dust, rock dust and other dusts
shall be considered as a part of the incombustible content of such mixture.
Sections 75.401, 75.402, and 75.403 shall
not apply to underground anthracite
mines.
Subpart F—Electrical Equipment—
General
§ 75.500 Permissible
ment.
electric
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00574
Fmt 8010
equip-
[STATUTORY PROVISION]
On and after March 30, 1971:
(a) All junction or distribution boxes
used for making multiple power connections inby the last open crosscut
shall be permissible;
(b) All handheld electric drills, blower and exhaust fans, electric pumps,
and such other low horsepower electric
face equipment as the Secretary may
designate on or before May 30, 1970,
which are taken into or used inby the
last open crosscut of any coal mine
shall be permissible;
(c) All electric face equipment which
is taken into or used inby the last open
crosscut of any coal mine classified
under any provision of law as gassy
prior to March 30, 1970, shall be permissible; and
(d) All other electric face equipment
which is taken into or used inby the
last crosscut of any coal mine, except a
coal mine referred to in § 75.501, which
has not been classified under any provision of law as a gassy mine prior to
March 30, 1970, shall be permissible.
§ 75.500–1 Other low horsepower electric face equipment.
Other low horsepower electric face
equipment designated pursuant to the
provisions of § 75.500(b) is all other electric-driven mine equipment, except low
horsepower rock dusting equipment,
and employs an electric current supplied by either a power conductor or
battery and consumes not more than
2,250 watts of electricity and which is
taken into or used inby the last open
crosscut.
564
VerDate Sep<11>2014
anthracite
[STATUTORY PROVISION]
[STATUTORY PROVISION]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.404 Exemption
mines.
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.501–3
§ 75.501 Permissible
electric
face
equipment; coal seams above water
table.
§ 75.501–3 New openings; mines above
water table and never classed
gassy.
(a) Where a new opening(s) is proposed to be developed by shaft, slope,
or drift from the surface to, or in, any
coalbed and the operator considers
such proposed new opening(s) to be a
part of a mine coming under section
305(a)(2) of the Act and § 75.501 the operator shall so notify the District Manager for the District in which the mine
is located in writing prior to the date
any actual development (in coal)
through such opening(s) is undertaken.
Such notification shall include the following information:
(1) Name, address, and identification
number of the existing mine.
(2) A current map of the existing
mine clearly setting out the proposed
new opening(s), mining plan and
planned interconnection, if any, with
existing workings.
(3) A statement as to when the operator obtained the right to mine the
coal which the proposed new opening(s)
will traverse.
(4) The name of the coalbeds currently being mined and those which the
new opening(s) will traverse.
(5) The expected life of the mine.
(6) The reason(s) for the proposed new
opening(s) (for example, haulage, ventilation, drainage, to avoid bad roof,
escapeway).
The District Manager shall require submission of any additional information
he considers pertinent.
(b) The District Manager shall make
a determination based on all of the information submitted by the operator as
to whether the proposed new opening(s)
will be considered as a part of the existing mine or as a new mine. The following guidelines and criteria shall be
used by the District Manager in making his determination:
(1) The effect that the proposed new
opening(s) will have on the safety of
the men working in the existing mine
shall be considered of primary importance.
(2) Whether the operator had a right
to mine the coal which the proposed
new openings will traverse prior to the
date of enactment of the Act (December 30, 1969) and whether the original
mining plan included mining such coal.
[STATUTORY PROVISION]
On and after March 30, 1974, all electric face equipment, other than equipment referred to in paragraph (b) of
§ 75.500, which is taken into and used
inby the last open crosscut of any coal
mine which is operated entirely in coal
seams located above the water table
and which has not been classified under
any provision of law as a gassy mine
prior to March 30, 1970, and in which
one or more openings were made prior
to December 30, 1969, shall be permissible.
§ 75.501–1 Coal seams above the water
table.
As used in § 75.501, the phrase ‘‘coal
seams above the water table’’ means
coal seams in a mine which are located
at an elevation above a river or the
tributary of a river into which a local
surface water system naturally drains.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.501–2 Permissible
equipment.
electric
face
(a) On and after March 30, 1971, in
mines operated entirely in coal seams
which are located at elevations above
the water table:
(1) All junction or distribution boxes
used for making multiple power connections inby the last open crosscut
shall be permissible; and
(2) All handheld electric drills, blower and exhaust fans, electric pumps,
and all other electric-driven mine
equipment, except low horsepower rock
dusting equipment, that employs an
electric current supplied by either a
power conductor or battery and consumes not more than 2,250 watts of
electricity, which is taken into or used
inby the last open crosscut shall be
permissible.
(b) On and after March 30, 1974, in
mines operated entirely in coal seams
which are located at elevations above
the water table, all electric face equipment which is taken into or used inby
the last crosscut shall be permissible.
565
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00575
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.502
30 CFR Ch. I (7–1–19 Edition)
(3) Whether, in accordance with the
usual mining practices common to the
particular district, the proposed new
openings would have been considered a
new mine or part of the existing mine.
A number of factors will be considered
including, but not limited to:
(i) The relationship between the coalbeds currently being mined, and those
proposed to be mined;
(ii) The distance between existing
openings and the proposed new opening(s);
(iii) The projected time elapsing between the start of the new opening(s)
and planned interconnection, if any,
with the existing mine; and
(iv) The projected tonnage of coal
which is expected to be mined prior to
interconnection where interconnection
is planned.
The District Manager shall notify the
operator in writing within 30 days of
receiving all of the information, required and requested, of his determination. No informal notification shall be
given.
(c) All new opening(s) shall be operated as a new mine prior to receiving a
written notification from the District
Manager that such new opening(s) will
be considered part of an existing mine
coming under section 305(a)(2) of the
Act and § 75.501.
(d) Nothing in this § 75.501–3 shall be
construed to relieve the operator from
compliance with any of the mandatory
standards contained in this Part 75.
[37 FR 8949, May 3, 1972]
§ 75.502
Permits for noncompliance.
An operator need not comply with
paragraph (d) of § 75.500 or with § 75.501
during the period of time specified in a
permit issued by the Interim Compliance Panel established by the Act.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.503 Permissible
electric
equipment; maintenance.
face
§ 75.503–1 Statement listing all electric
face equipment.
Each operator of a coal mine shall
complete and file Mine Safety and
Health Administration Form No. 6–1496
entitled ‘‘Coal Operator’s Electrical
Survey’’ and Form 6–1496 Supplemental
entitled ‘‘Operator’s Survey of Electrical Face Equipment.’’ Forms may be
obtained from any MSHA Coal Mine
Safety and Health district office. Separate forms shall be filed for each mine.
Copies one and two of the completed
form shall be filed with the Coal Mine
District Manager for the district in
which each mine is located on or before
May 30, 1970. An operator must list all
electric face equipment being used at
each mine as of the time of filing, all
such equipment being repaired, and all
standby electric equipment stored at or
in the mine which the operator intends
to use as face equipment.
[35 FR 17890, Nov. 20, 1970, as amended at 71
FR 16668, Apr. 3, 2006]
§ 75.504 Permissibility of new, replacement, used, reconditioned, additional, and rebuilt electric face
equipment.
On and after March 30, 1971, all new,
replacement, used, reconditioned, and
additional electric face equipment used
in any mine referred to in §§ 75.500,
75.501, and 75.503 shall be permissible
and shall be maintained in a permissible condition, and in the event of any
major overhaul of any item of electric
face equipment in use on or after
March 30, 1971, such equipment shall be
put in, and thereafter maintained in, a
permissible condition, unless in the
opinion of the Secretary, such equipment or necessary replacement parts
are not available.
[38 FR 4975, Feb. 23, 1973]
§ 75.505 Mines classed gassy; use and
maintenance of permissible electric
face equipment.
[STATUTORY PROVISIONS]
[STATUTORY PROVISION]
The operator of each coal mine shall
maintain in permissible condition all
electric face equipment required by
§§ 75.500, 75.501, 75.504 to be permissible
which is taken into or used inby the
last open crosscut of any such mine.
Any coal mine which, prior to March
30, 1970, was classed gassy under any
provision of law and was required to
use permissible electric face equipment
and to maintain such equipment in a
permissible condition shall continue to
566
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00576
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.506–1
use such equipment and to maintain
such equipment in such condition.
(4) Flame Safety Lamps;
(5) Portable Methane Detectors, part
22;
(6) Telephone and Signaling Devices,
part 23;
(7) Single-Shot Blasting Units;
(8) Lighting Equipment for Illuminating Underground Workings;
(9) Methane-Monitoring Systems,
part 27; and
(10) Continuous Duty, Warning Light,
Portable Methane Detectors, 30 CFR
part 29 contained in the 30 CFR, parts
1–199, edition, revised as of July 1, 1999.
§ 75.506 Electric face equipment; requirements for permissibility.
(a) Electric-driven mine equipment
and accessories manufactured on or
after March 30, 1973, will be permissible
electric face equipment only (1) if they
are fabricated, assembled, or built
under an approval, or any extension
thereof, issued by the Bureau of Mines
or the Mine Safety and Health Administration in accordance with schedule
2G, or any subsequent Bureau of Mines
schedule promulgated by the Secretary
after March 30, 1970, which amends,
modifies, or supersedes the permissibility requirements of schedule 2G, and
(2) if they are maintained in a permissible condition.
(b) Except as provided in paragraph
(c) of this § 75.506 electric-driven mine
equipment and accessories manufactured prior to March 30, 1973, will be
permissible electric face equipment (1)
if they were fabricated, assembled, or
built under an approval, or any extension thereof, issued by the Bureau of
Mines in accordance with the schedules
set forth below, and (2) if they are
maintained in a permissible condition.
kpayne on VMOFRWIN702 with $$_JOB
Bureau
Bureau
1945;
Bureau
and
Bureau
of Mines Schedule 2D, May 23, 1936;
of Mines Schedule 2E, February 15,
of Mines Schedule 2F, August 3, 1955;
of Mines Schedule 2G, March 19, 1968.
Copies of these schedules are available
at all MSHA Coal Mine Safety and
Health district offices.
(c) Electric driven mine equipment
and accessories bearing the Bureau of
Mines approval numbers listed in Appendix A to this subpart are permissible electric face equipment only if
they are maintained in a permissible
condition.
(d) The following equipment will be
permissible electric face equipment
only if it is approved under the appropriate parts of this chapter, or former
Bureau of Mines’ approval schedules,
and if it is in permissible condition:
(1) Multiple-Shot Blasting Units, part
7 subpart D;
(2) Electric Cap Lamps, part 19;
(3) Electric Mine Lamps Other than
Standard Cap Lamps, part 20;
[35 FR 17890, Nov. 20, 1970, as amended at 63
FR 47119, Sept. 3, 1998; 64 FR 43283, Aug. 10,
1999; 71 FR 16668, Apr. 3, 2006]
§ 75.506–1 Electric
face
equipment;
permissible condition; maintenance
requirements.
(a) Except as provided in paragraph
(b) of this section, electric face equipment which meets the requirements for
permissibility set forth in § 75.506 will
be considered to be in permissible condition only if it is maintained so as to
meet the requirements for permissibility set forth in the Bureau of Mines
schedule under which such electric face
equipment was initially approved, or, if
the equipment has been modified, it is
maintained so as to meet the requirements of the schedule under which
such modification was approved.
(b) Electric face equipment bearing
the Bureau of Mines approval number
listed in Appendix A of this subpart
will be considered to be in permissible
condition only if it is maintained so as
to meet the requirements for permissibility set forth in Bureau of Mines
Schedule 2D or, if such equipment has
been modified, it is maintained so as to
meet the requirements of the schedule
under which the modification was approved.
(c) Notwithstanding the provisions of
paragraphs (a) and (b) of this section,
where the minimum requirements for
permissibility set forth in the appropriate Bureau of Mines schedule under
which such equipment or modifications
were approved have been superseded by
the requirements of this Part 75, the
latter requirements shall be applicable.
567
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00577
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.507
§ 75.507
30 CFR Ch. I (7–1–19 Edition)
Power connection points.
[STATUTORY PROVISIONS]
Except where permissible power connection units are used, all power-connection points outby the last open
crosscut shall be in intake air.
§ 75.507–1 Electric equipment other
than
power-connection
points;
outby the last open crosscut; return
air; permissibility requirements.
(a) All electric equipment, other than
power-connection points, used in return air outby the last open crosscut in
any coal mine shall be permissible except as provided in paragraphs (b) and
(c) of this section.
(b) Notwithstanding the provisions of
paragraph (a) of this section, in any
coal mine where nonpermissible electric face equipment may be taken into
or used inby the last open crosscut
until March 30, 1974, such nonpermissible electric face equipment may be
used in return air outby the last open
crosscut.
(c) Notwithstanding the provisions of
paragraph (a) of this section, in any
coal mine where a permit for noncompliance is in effect, nonpermissible
electric face equipment specified in
such permit for noncompliance may be
used in return air outby the last open
crosscut for the duration of such permit.
[38 FR 4975, Feb. 23, 1973]
§ 75.508
Map of electrical system.
kpayne on VMOFRWIN702 with $$_JOB
[STATUTORY PROVISIONS]
The location and the electrical rating
of all stationary electric apparatus in
connection with the mine electric system, including permanent cables,
switchgear,
rectifying
substations,
transformers, permanent pumps, and
trolley wires and trolley feeder wires,
and settings of all direct-current circuit breakers protecting underground
trolley circuits, shall be shown on a
mine map. Any changes made in a location, electric rating, or setting shall be
promptly shown on the map when the
change is made. Such map shall be
available to an authorized representative of the Secretary and to the miners
in such mine.
§ 75.508–1 Mine tracks.
When mine track is used as a conductor of a trolley system, the location
of such track shall be shown on the
map required by § 75.508, with a notation of the number of rails and the size
of such track expressed in pounds per
yard.
§ 75.508–2 Changes in electric system
map; recording.
Changes made in the location, electrical rating or setting within the mine
electrical system shall be recorded on
the map of such system no later than
the end of the next workday following
completion of such changes.
§ 75.509 Electric power circuit and
electric equipment; deenergization.
[STATUTORY PROVISIONS]
All power circuits and electric equipment shall be deenergized before work
is done on such circuits and equipment,
except when necessary for trouble
shooting or testing.
§ 75.510 Energized trolley wires; repair.
[STATUTORY PROVISIONS]
Energized trolley wires may be repaired only by a person trained to perform electrical work and to maintain
electrical equipment and the operator
of a mine shall require that such person wear approved and tested insulated
shoes and wireman’s gloves.
§ 75.510–1 Repair of energized trolley
wires; training.
The training referred to in § 75.510
must include training in the repair and
maintenance of live trolley wires, and
in the hazards involved in making such
repairs, and in the limitations of protective clothing used to protect against
such hazards.
§ 75.511 Low-, medium-, or high-voltage distribution circuits and equipment; repair.
[STATUTORY PROVISION]
No electrical work shall be performed
on low-, medium-, or high-voltage distribution circuits or equipment, except
by a qualified person or by a person
568
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00578
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.516–1
trained to perform electrical work and
to maintain electrical equipment under
the direct supervision of a qualified
person. Disconnecting devices shall be
locked out and suitably tagged by the
persons who perform such work, except
that in cases where locking out is not
possible, such devices shall be opened
and suitably tagged by such persons.
Locks or tags shall be removed only by
the persons who installed them or, if
such persons are unavailable, by persons authorized by the operator or his
agent.
sulting from normal operation will not
damage the insulating materials.
§ 75.511–1 Qualified person.
To be a qualified person within the
meaning of § 75.511, an individual must
meet the requirements of § 75.153.
§ 75.514 Electrical
connections
splices; suitability.
§ 75.512 Electric equipment; examination, testing and maintenance.
[STATUTORY PROVISION]
All electric equipment shall be frequently examined, tested, and properly
maintained by a qualified person to assure safe operating conditions. When a
potentially dangerous condition is
found on electric equipment, such
equipment shall be removed from service until such condition is corrected. A
record of such examinations shall be
kept and made available to an authorized representative of the Secretary
and to the miners in such mine.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.512–1 Qualified person.
To be a qualified person within the
meaning of § 75.512, an individual must
meet the requirements of § 75.153.
§ 75.512–2 Frequency of examinations.
The examinations and tests required
by § 75.512 shall be made at least weekly. Permissible equipment shall be examined to see that it is in permissible
condition.
§ 75.513 Electric conductor;
and insulation.
capacity
All electric conductors shall be sufficient in size and have adequate current
carrying capacity and be of such construction that a rise in temperature re-
Electric conductor; size.
An electric conductor is not of sufficient size to have adequate carrying
capacity if it is smaller than is provided for in the National Electric Code,
1968. In addition, equipment and trailing cables that are required to be permissible must meet the requirements
of the appropriate schedules of the Bureau of Mines.
[STATUTORY PROVISION]
§ 75.515
Cable fittings; suitability.
[STATUTORY PROVISION]
Cables shall enter metal frames of
motors, splice boxes, and electric compartments only through proper fittings. When insulated wires other than
cables pass through metal frames, the
holes shall be substantially bushed
with insulated bushings.
§ 75.516
Power wires; support.
[STATUTORY PROVISION]
All power wires (except trailing cables on mobile equipment, specially designed cables conducting high-voltage
power to underground rectifying equipment or transformers, or bare or insulated ground and return wires) shall be
supported on well-insulated insulators
and shall not contact combustible material, roof, or ribs.
Installed insulators.
Well-insulated insulators is interpreted
to
mean
well-installed
insulators. Insulated J-hooks may be
used to suspend insulated power cables
569
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00579
Fmt 8010
or
All electrical connections or splices
in conductors shall be mechanically
and electrically efficient, and suitable
connectors shall be used. All electrical
connections or splices in insulated wire
shall be reinsulated at least to the
same degree of protection as the remainder of the wire.
§ 75.516–1
[STATUTORY PROVISION]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.513–1
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.516–2
30 CFR Ch. I (7–1–19 Edition)
for temporary installation not exceeding 6 months and for permanent installation of control cables such as may be
used along belt conveyors.
§ 75.516–2 Communication wires and
cables; installation; insulation; support.
(a) All communication wires shall be
supported on insulated hangers or insulated J-hooks.
(b) All communication cables shall be
insulated as required by § 75.517–1, and
shall either be supported on insulated
or uninsulated hangers or J-hooks, or
securely attached to messenger wires,
or buried, or otherwise protected
against mechanical damage in a manner approved by the Secretary or his
authorized representative.
(c) All communication wires and cables installed in track entries shall, except when a communication cable is
buried in accordance with paragraph
(b) of this section, be installed on the
side of the entry opposite to trolley
wires and trolley feeder wires. Additional insulation shall be provided for
communication circuits at points
where they pass over or under any
power conductor.
(d) For purposes of this section, communication cable means two or more
insulated conductors covered by an additional abrasion-resistant covering.
[38 FR 4975, Feb. 23, 1973]
§ 75.517 Power wires and cables; insulation and protection.
[STATUTORY PROVISIONS]
Power wires and cables, except trolley wires, trolley feeder wires, and bare
signal wires, shall be insulated adequately and fully protected.
§ 75.517–1 Power wires and cables; insulation and protection.
kpayne on VMOFRWIN702 with $$_JOB
Power wires
or after March
lation with a
least equal to
cuit.
and cables installed on
30, 1970, shall have insudielectric strength at
the voltage of the cir-
§ 75.517–2 Plans for insulation of existing bare power wires and cables.
(a) On or before December 31, 1970,
plans for the insulation of existing bare
power wires and cables installed prior
to March 30, 1970, shall be filed with
the District Manager of the Coal Mine
Safety District in which the mine is located to permit approval and prompt
implementation of such plans.
(b) The appropriate District Manager
shall notify the operator in writing of
the approval of a proposed insulation
plan. If revisions are required for approval, the changes required will be
specified.
(c) An insulation plan shall include
the following information:
(1) Name and address of the company,
the mine and the responsible officials;
(2) Map or diagram indicating location of power wires and cables required
to be insulated;
(3) Total length of bare power wires
and cables required to be insulated;
(4) Schedule for the replacement or
insulation of bare power wires and cables;
(5) Type of insulation to be used and
the voltage rating as indicated by the
manufacturer.
(d) The District Manager shall be
guided by the following criteria in approving insulation plans on a mine-bymine basis. Insulation not conforming
to these criteria may be approved provided the operator can satisfy the Mine
Safety and Health Administration that
the insulation will provide no less than
the same measure of protection.
(1) Insulation shall be adequate for
the applied voltage of the circuit.
(2) When tubing is used to insulate
existing power wires and cables, it
shall have a dielectric strength at least
equal to the voltage of the circuit.
When the tubing is split for purposes of
installation, the joints shall be effectively sealed. The butt ends may be
sealed with a moisture resistant insulating tape.
(3) When tape is used to insulate existing power wires and cables, it shall
be applied half-lapped and one thickness of the tape shall have a dielectric
strength at least equal to the voltage
of the circuit. The tape shall be self-adhesive and moisture resistant.
570
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00580
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.522–1
§ 75.518 Electric equipment and circuits; overload and short circuit
protection.
§ 75.519–1 Main power circuits; disconnecting switches; locations.
[STATUTORY PROVISION]
Automatic circuit-breaking devices
or fuses of the correct type and capacity shall be installed so as to protect
all electric equipment and circuits
against short circuit and overloads.
Three-phase motors on all electric
equipment shall be provided with overload protection that will deenergize all
three phases in the event that any
phase is overloaded.
Section 75.519 requires (a) that a disconnecting switch be installed on the
surface at a point within 500 feet of the
place where the main power circuit enters the underground area of a mine,
and (b) that, in an instance on which a
main power circuit enters the underground area through a shaft or borehole, a disconnecting switch be installed underground within 500 feet of
the bottom of the shaft or borehole.
§ 75.520
Electric equipment; switches.
[STATUTORY PROVISION]
§ 75.518–1 Electric equipment and circuits; overload and short circuit
protection; minimum requirements.
A device to provide either short circuit protection or protection against
overload which does not conform to the
provisions of the National Electric
Code, 1968, does not meet the requirement of § 75.518. In addition, such devices on electric face equipment and
trailing cables that are required to be
permissible must meet the requirements of the applicable schedules of
the Bureau of Mines.
§ 75.518–2 Incandescent lamps, overload and short circuit protection.
Incandescent lamps installed along
haulageways and at other locations,
not contacting combustible material,
and powered from trolley or direct current feeder circuits, need not be provided with separate short circuit or
overload protection, if the lamp is not
more than 8 feet in distance from such
circuits.
§ 75.521 Lightning
arresters;
ungrounded and exposed power
conductors and telephone wires.
Each ungrounded, exposed power conductor and each ungrounded, exposed
telephone wire that leads underground
shall be equipped with suitable lightning arresters of approved type within
100 feet of the point where the circuit
enters the mine. Lightning arresters
shall be connected to a low resistance
grounding medium on the surface
which shall be separated from neutral
grounds by a distance of not less than
25 feet.
[38 FR 4975, Feb. 23, 1973]
§ 75.522
Lighting devices.
[STATUTORY PROVISION]
dis-
No device for the purpose of lighting
any coal mine which has not been approved by the Secretary or his authorized representative shall be permitted
in such mine.
In all main power circuits, disconnecting switches shall be installed
underground within 500 feet of the bottoms of shafts and boreholes through
which main power circuits enter the
underground area of the mine and
within 500 feet of all other places where
main power circuits enter the underground area of the mine.
§ 75.522–1 Incandescent and fluorescent lamps.
(a) Except for areas of a coal mine
inby the last open crosscut, incandescent lamps may be used to illuminate
underground areas. When incandescent
lamps are used in a track entry or belt
entry or near track entries to illuminate special areas other than structures, the lamps shall be installed in
§ 75.519 Main power circuits;
connecting switches.
[STATUTORY PROVISION]
kpayne on VMOFRWIN702 with $$_JOB
All electric equipment shall be provided with switches or other controls
that are safely designed, constructed,
and installed.
571
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00581
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.523
30 CFR Ch. I (7–1–19 Edition)
weather-proof sockets located in positions such that the lamps will not
come in contact with any combustible
material. Lamps used in all other
places must be of substantial construction and be fitted with a glass enclosure.
(b) Incandescent lamps within glass
enclosures or fluorescent lamps may be
used inside underground structures (except magazines used for the storage of
explosives and detonators). In underground structures lighting circuits
shall consist of cables installed on
insulators or insulated wires installed
in metallic conduit or metallic armor.
§ 75.523 Electric
face
deenergization.
equipment;
[STATUTORY PROVISION]
An authorized representative of the
Secretary may require in any mine
that electric face equipment be provided with devices that will permit the
equipment to be deenergized quickly in
the event of an emergency.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.523–1 Deenergization of self-propelled electric face equipment installation requirements.
(a) Except as provided in paragraphs
(b) and (c) of this section, all self-propelled electric face equipment which is
used in the active workings of each underground coal mine on and after
March 1, 1973, shall, in accordance with
the schedule of time specified in paragraphs (a) (1) and (2) of this section, be
provided with a device that will quickly deenergize the tramming motors of
the equipment in the event of an emergency. The requirements of this paragraph (a) shall be met as follows:
(1) On and after December 15, 1974, for
self-propelled cutting machines, shuttle cars, battery-powered machines,
and roof drills and bolters;
(2) On and after February 15, 1975, for
all other types of self-propelled electric
face equipment.
(b) Self-propelled electric face equipment that is equipped with a substantially constructed cab which meets the
requirements of this part, shall not be
required to be provided with a device
that will quickly deenergize the
tramming motors of the equipment in
the event of an emergency.
(c) An operator may apply to the Director of Technical Support, Mine
Safety and Health Administration, Department of Labor, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; for approval of the installation of devices to be used in lieu of devices that will quickly deenergize the
tramming motors of self-propelled electric face equipment in the event of an
emergency. The Director of Technical
Support may approve such devices if he
determines that the performance thereof will be no less effective than the performance requirements specified in
§ 75.523–2.
[38 FR 3407, Feb. 6, 1973, as amended at 39 FR
27557, July 30, 1974; 43 FR 12320, Mar. 24, 1978;
47 FR 28096, June 29, 1982; 67 FR 38386, June
4, 2002; 80 FR 52992, Sept. 2, 2015]
§ 75.523–2 Deenergization of self-propelled electric face equipment; performance requirements.
(a) Deenergization of the tramming
motors of self-propelled electric face
equipment, required by paragraph (a)
of § 75.523–1, shall be provided by:
(1) Mechanical actuation of an existing pushbutton emergency stopswitch,
(2) Mechanical actuation of an existing lever emergency stopswitch, or
(3) The addition of a separate
electromechanical switch assembly.
(b)
The
existing
emergency
stopswitch or additional switch assembly shall be actuated by a bar or lever
which shall extend a sufficient distance
in each direction to permit quick
deenergization of the tramming motors
of self-propelled electric face equipment from all locations from which the
equipment can be operated.
(c) Movement of not more than 2
inches of the actuating bar or lever resulting from the application of not
more than 15 pounds of force upon contact with any portion of the equipment
operator’s body at any point along the
length of the actuating bar or lever
shall cause deenergization of the
tramming motors of the self-propelled
electric face equipment.
[38 FR 3406, Feb. 6, 1973; 38 FR 4394, Feb. 14,
1973]
572
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00582
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
Pt. 75, Subpt. F, App. A
§ 75.523–3 Automatic emergency-parking brakes.
(a) Except for personnel carriers, rubber-tired, self-propelled electric haulage equipment used in the active workings of underground coal mines shall be
equipped with automatic emergencyparking brakes in accordance with the
following schedule.
(1) On and after May 23, 1989—
(i) All new equipment ordered; and
(ii) All equipment originally furnished with or retrofitted with automatic emergency-parking brakes which
meet the requirements of this section.
(2) On and after May 23, 1991, all
other equipment.
(b) Automatic emergency-parking
brakes shall—
(1) Be activated immediately by the
emergency deenergization device required by 30 CFR 75.523–1 and 75.523–2;
(2) Engage automatically within 5.0
seconds when the equipment is deenergized;
(3) Safely bring the equipment when
fully loaded to a complete stop on the
maximum grade on which it is operated;
(4) Hold the equipment stationary despite any contraction of brake parts,
exhaustion of any non-mechanical
source of energy, or leakage; and
(5) Release only by a manual control
that does not operate any other equipment function.
(c) Automatic emergency-parking
brakes shall include a means in the
equipment operator’s compartment
to—
(1) Apply the brakes manually without deenergizing the equipment; and
(2) Release and reengage the brakes
without energizing the equipment.
(d) On and after November 24, 1989,
rubber-tired,
self-propelled
electric
face equipment not covered by paragraph (a) of this section shall be
equipped with a means incorporated on
the equipment and operable from each
tramming station to hold the equipment stationary—
(1) On the maximum grade on which
it is operated; and
(2) Despite any contraction of components, exhaustion of any non-mechanical source of energy, or leakage.
(e) The brake systems required by
paragraphs (a) or (d) of this section
shall be applied when the equipment
operator is not at the controls of the
equipment, except during movement of
disabled equipment.
[54 FR 12412, Mar. 24, 1989]
§ 75.524 Electric face equipment; electric equipment used in return air
outby the last open crosscut; maximum level of alternating or direct
electric current between frames of
equipment.
The maximum level of alternating or
direct electric current that exists between the frames of any two units of
electric face equipment that come in
contact with each other in the working
places of a coal mine, or between the
frames of any two units of electric
equipment that come in contact with
each other in return air outby the last
open crosscut, shall not exceed one ampere as determined from the voltage
measured across a 0.1 ohm resistor connected between the frames of such
equipment.
[38 FR 29998, Oct. 31, 1973]
APPENDIX A TO SUBPART F OF PART 75—
LIST OF PERMISSIBLE ELECTRIC
FACE EQUIPMENT APPROVED BY THE
BUREAU OF MINES PRIOR TO MAY 23,
1936
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No.
Date
AIR COMPRESSORS
128 ..................................
128A ................................
March 21, 1927.
July 16, 1926.
COAL DRILLS AND DRILLING MACHINES
Hand Drills
109
154
184
227
254
..................................
..................................
..................................
..................................
..................................
September 19, 1922.
August 1, 1928.
February 7, 1930.
July 29, 1931.
July 15, 1933.
Post Drills
119 ..................................
119A ................................
225 ..................................
225A ................................
228 ..................................
228A ................................
230 ..................................
230A ................................
237 ..................................
237A ................................
April 15, 1925.
Do.
July 10, 1931.
Do.
August 12, 1931.
February 17, 1932.
August 20, 1931.
Do.
December 1, 1931.
Do.
573
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00583
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Pt. 75, Subpt. F, App. A
30 CFR Ch. I (7–1–19 Edition)
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No.
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No.
Date
Power Units for Conveyors
Drilling Machines
147 ..................................
147A ................................
176 ..................................
176A ................................
265 ..................................
265A ................................
390A ................................
February 8, 1928.
Do.
September 9, 1929.
Do.
247 ..................................
257A ................................
262A ................................
271 ..................................
271A ................................
274A ................................
286A ................................
295 ..................................
299A ................................
LOADING MACHINES
Unmounted Type
January 8, 1926.
Do.
Caterpillar-Mounted Type
150 ..................................
186 ..................................
222 ..................................
222A ................................
229 ..................................
229A ................................
235 ..................................
235A ................................
278 ..................................
278A ................................
283A ................................
284A ................................
285A ................................
294 ..................................
300A ................................
127 ..................................
127A ................................
May 11, 1928.
March 15, 1930.
May 8, 1931.
July 28, 1931.
August 17, 1931.
Do.
November 27, 1931.
October 29, 1931.
January 17, 1935.
Do.
March 12, 1935.
Do.
Do.
September 18, 1935.
May 6, 1936.
July 16, 1926.
September 23, 1927.
MINING MACHINES
Shortwall Machines
103 ..................................
103A ................................
105 ..................................
105A ................................
106 ..................................
106A ................................
107 ..................................
107A ................................
108 ..................................
108A ................................
111 ..................................
111A ................................
113 ..................................
113A ................................
114 ..................................
114A ................................
115 ..................................
115A ................................
153 ..................................
153A ................................
193 ..................................
193A ................................
197 ..................................
197A ................................
198 ..................................
198A ................................
201 ..................................
201A ................................
204 ..................................
204A ................................
223 ..................................
223A ................................
241 ..................................
241A ................................
258 ..................................
259A ................................
260A ................................
273 ..................................
June 6, 1930.
Do.
February 27, 1931.
Do.
January 11, 1935.
January 17, 1935.
March 12, 1935.
July 3, 1935.
March 27, 1929.
Do.
July 26, 1929.
June 24, 1929.
December 10, 1932.
Do.
February 20, 1933.
CONVEYORS
Belt Type
236 ..................................
287A ................................
296A ................................
November 19, 1931.
March 12, 1935.
January 6, 1936.
kpayne on VMOFRWIN702 with $$_JOB
Chain Type
151 ..................................
209 ..................................
240 ..................................
240A ................................
298A ................................
August 5, 1927.
Do.
September 29, 1930.
July 26, 1930.
July 27, 1931.
July 31, 1933.
Do.
MINING MACHINES, MACHINERY-MOVING EQUIPMENT,
MISCELLANEOUS TRUCKS, AND WATER SPRAY SUPPLY UNITS
Pit-Car Loaders
167 ..................................
167A ................................
175 ..................................
175A ................................
250 ..................................
250A ................................
252A ................................
October 21, 1932.
August 11, 1933.
December 8, 1933.
May 20, 1935.
October 17, 1934.
December 13, 1934.
March 12, 1935.
September 20, 1935.
April 9, 1936.
Scraper-type Loaders
138 ..................................
138A ................................
196 ..................................
196A ................................
226 ..................................
255 ..................................
256 ..................................
Track-Mounted Type
194 ..................................
194A ................................
217 ..................................
217A ................................
276 ..................................
277 ..................................
282A ................................
291A ................................
February 12, 1934.
March 19, 1934.
March 23, 1934.
Shaker Type
LOADING AND CONVEYING EQUIPMENT
122 ..................................
122A ................................
Date
May 19, 1928.
December 2, 1930.
March 12, 1932.
Do.
March 3, 1936.
November 2, 1917.
Do.
February 9, 1922.
Do.
Do.
Do.
Do.
Do.
Do.
Do.
October 16, 1922.
Do.
November 4, 1924.
Do.
February 7, 1925.
Do.
Do.
Do.
July 31, 1928.
Do.
June 3, 1930.
Do.
July 31, 1930.
Do.
August 1, 1930.
Do.
September 8, 1930.
Do.
October 13, 1930.
December 13, 1930.
May 13, 1931.
Do.
March 18, 1932.
Do.
August 15, 1933.
August 16, 1933.
August 17, 1933.
November 30, 1934.
574
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00584
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
Pt. 75, Subpt. F, App. A
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No.
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Date
288 ..................................
288A ................................
292 ..................................
292A ................................
293A ................................
Approval No.
March 27, 1935.
Do.
September 11, 1935.
Do.
Do.
Rock-Dusting Machines
130 ..................................
137 ..................................
146 ..................................
146A ................................
180 ..................................
180A ................................
206 ..................................
279 ..................................
Longwall Machines
185 ..................................
185A ................................
218 ..................................
218A ................................
246 ..................................
246A ................................
261 ..................................
February 24, 1930.
Do.
March 10, 1931.
Do.
August 19, 1932.
Do.
September 12, 1933.
March 13, 1924.
Do.
March 12, 1925.
Do.
April 26, 1926.
Do.
April 30, 1929.
Do.
April 15, 1930.
Do.
November 14, 1930.
Do.
February 12, 1931.
Do.
August 31, 1931.
Do.
April 7, 1932.
June 18, 1932.
September 20, 1932.
February 25, 1933.
June 27, 1934.
July 25, 1934.
September 24, 1934.
March 4, 1935.
January 27, 1936.
Do.
kpayne on VMOFRWIN702 with $$_JOB
February 13, 1925.
Do.
January 21, 1931.
Do.
Do.
Do.
April 5, 1929.
February 26, 1934.
April 20, 1930.
January 16, 1933.
January 11, 1934.
February 27, 1934.
STORAGE-BATTERY LOCOMOTIVES AND POWER TRUCKS
(Approved under Schedules 15, 2C, 2D, and 2E)
Gathering Locomotives
1501
1502
1503
1505
1507
1508
1509
1511
1512
1513
1516
1517
1520
1521
1522
1523
1525
1526
Mine Pumps
140 ..................................
140A ................................
143 ..................................
143A ................................
144 ..................................
144A ................................
199 ..................................
199A ................................
208 ..................................
210 ..................................
210A ................................
211 ..................................
211A ................................
213 ..................................
213A ................................
214 ..................................
214A ................................
215 ..................................
215A ................................
248 ..................................
248A ................................
264 ..................................
264A ................................
272 ..................................
272A ................................
November 5, 1926.
July 2, 1927.
January 20, 1928.
April 3, 1928.
October 30, 1929.
January 17, 1930.
November 12, 1930.
February 14, 1935.
Room and Car-Spotting Hoists
116 ..................................
116A ................................
164 ..................................
164A ................................
165 ..................................
165A ................................
169 ..................................
169A ................................
190 ..................................
251A ................................
263 ..................................
266A ................................
Track or caterpillar mounted
112 ..................................
112A ................................
118 ..................................
118A ................................
125 ..................................
125A ................................
172 ..................................
172A ................................
188 ..................................
188A ................................
207 ..................................
207A ................................
216 ..................................
216A ................................
231 ..................................
231A ................................
242 ..................................
244 ..................................
244A ................................
253A ................................
267 ..................................
268A ................................
269A ................................
280A ................................
297 ..................................
297A ................................
Date
November 1, 1927.
Do.
Do.
Do.
Do.
Do.
August 18, 1930.
Do.
November 29, 1930.
December 15, 1930.
Do.
December 17, 1930.
Do.
December 29, 1930.
Do.
January 2, 1931.
Do.
Do.
Do.
October 31, 1932.
November 23, 1932.
January 31, 1934.
Do.
October 23, 1934.
Do.
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
................................
October 11, 1921.
November 13, 1922.
March 24, 1923.
April 5, 1924.
August 20, 1925.
March 21, 1925.
September 25, 1925.
November 10, 1925.
November 11, 1925.
February 25, 1926.
December 28, 1926.
February 10, 1927.
May 27, 1929.
June 13, 1930.
September 12, 1930.
December 19, 1930.
July 25, 1934.
December 20, 1935.
Tandem Locomotive
1518 ................................
November 21, 1927.
Power Trucks
1506 ................................
1505A ..............................
1510C .............................
1514 ................................
1515 ................................
1512C .............................
1519C .............................
1524C .............................
May 5, 1924.
June 21, 1926.
December 31, 1926.
December 18, 1926.
December 28, 1926.
September 13, 1928.
April 6, 1929.
June 25, 1934.
JUNCTION, DISTRIBUTION, AND SPLICE BOXES
(Approved under Schedules 2D and 2E)
Junction Boxes
400 ..................................
400A ................................
401 ..................................
June 16, 1928.
August 5, 1925.
May 11, 1927.
575
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00585
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.600
30 CFR Ch. I (7–1–19 Edition)
Motor-Driven Mine Equipment
(Approved Under Schedules 2, 2A, 2B, and 2C)
Approval No.
401A ................................
402 ..................................
402A ................................
403 ..................................
403A ................................
405A ................................
Conductor size AWG or MGM
Date
Do.
Do.
Do.
April 14, 1931.
Do.
December 4, 1933.
Subpart G—Trailing Cables
§ 75.600 Trailing cables; flame resistance.
[STATUTORY PROVISIONS]
Trailing cables used in coal mines
shall meet the requirements established by the Secretary for flame-resistant cables.
§ 75.600–1 Approved cables; flame resistance.
Cables shall be accepted or approved
by MSHA as flame resistant.
Maximum allowable
circuit breaker instantaneous setting
(amperes)
14 .........................................................
12 .........................................................
10 .........................................................
8 ...........................................................
6 ...........................................................
4 ...........................................................
3 ...........................................................
2 ...........................................................
1 ...........................................................
1/0 ........................................................
2/0 ........................................................
3/0 ........................................................
4/0 ........................................................
250 .......................................................
300 .......................................................
350 .......................................................
400 .......................................................
450 .......................................................
500 .......................................................
50
75
150
200
300
500
600
800
1,000
1,250
1,500
2,000
2,500
2,500
2,500
2,500
2,500
2,500
2,500
§ 75.601–2 Short circuit protection; use
of fuses; approval by the Secretary.
Fuses shall not be employed to provide short circuit protection for trailing cables unless specifically approved
by the Secretary.
[57 FR 61223, Dec. 23, 1992]
§ 75.601 Short circuit
trailing cables.
protection
of
[STATUTORY PROVISIONS]
Short circuit protection for trailing
cables shall be provided by an automatic circuit breaker or other no less
effective device approved by the Secretary
of
adequate
current-interrupting capacity in each ungrounded
conductor. Disconnecting devices used
to disconnect power from trailing cables shall be plainly marked and identified and such devices shall be
equipped or designed in such a manner
that it can be determined by visual observation that the power is disconnected.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.601–1 Short circuit protection; ratings and settings of circuit breakers.
Circuit breakers providing short circuit protection for trailing cables shall
be set so as not to exceed the maximum allowable instantaneous settings
specified in this section; however, higher settings may be permitted by an authorized representative of the Secretary when he has determined that
special applications are justified:
§ 75.601–3 Short
circuit
protection;
dual element fuses; current ratings;
maximum values.
Dual element fuses having adequate
current-interrupting capacity shall
meet the requirements for short circuit
protection of trailing cables as provided in § 75.601, however, the current
ratings of such devices shall not exceed
the maximum values specified in this
section:
Single conductor
cable
Conductor size
(AWG or MGM)
14 .........................
12 .........................
10 .........................
8 ...........................
6 ...........................
4 ...........................
3 ...........................
2 ...........................
1 ...........................
1/0 ........................
2/0 ........................
3/0 ........................
4/0 ........................
250 .......................
300 .......................
350 .......................
400 .......................
450 .......................
500 .......................
Ampacity
Max.
fuse
rating
...............
...............
...............
60
85
110
130
150
170
200
235
275
315
350
395
445
480
515
545
............
............
............
60
90
110
150
150
175
200
250
300
350
350
400
450
500
600
600
576
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00586
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Two conductor
cable
Ampacity
15
20
25
50
65
90
105
120
140
170
195
225
260
285
310
335
360
385
415
Max.
fuse
rating
15
20
25
50
70
90
110
125
150
175
200
225
300
300
350
350
400
400
450
Mine Safety and Health Admin., Labor
§ 75.602
§ 75.700–1
cables from damage and to prevent
strain on the electrical connections.
Trailing cable junctions.
[STATUTORY PROVISION]
When two or more trailing cables
junction to the same distribution center, means shall be provided to assure
against connecting a trailing cable to
the wrong size circuit breaker.
§ 75.603 Temporary splice of trailing
cable.
§ 75.606
[STATUTORY PROVISIONS]
Trailing cables shall be adequately
protected to prevent damage by mobile
equipment.
§ 75.607 Breaking trailing cable and
power cable connections.
[STATUTORY PROVISION]
[STATUTORY PROVISIONS]
One temporary splice may be made in
any trailing cable. Such trailing cable
may only be used for the next 24-hour
period. No temporary splice shall be
made in a trailing cable within 25 feet
of the machine, except cable reel equipment. Temporary splices in trailing cables shall be made in a workmanlike
manner and shall be mechanically
strong and well insulated. Trailing cables or hand cables which have exposed
wires or which have splices that heat
or spark under load shall not be used.
As used in this section, the term
‘‘splice’’ means the mechanical joining
of one or more conductors that have
been severed.
§ 75.604 Permanent splicing of trailing
cables.
[STATUTORY PROVISIONS]
When permanent splices in trailing
cables are made, they shall be:
(a) Mechanically strong with adequate electrical conductivity and flexibility;
(b) Effectively insulated and sealed
so as to exclude moisture; and
(c) Vulcanized or otherwise treated
with suitable materials to provide
flame-resistant qualities and good
bonding to the outer jacket.
(d) Made using splice kits accepted or
approved by MSHA as flame resistant.
[35 FR 17890, Nov. 20, 1970, as amended at 57
FR 61223, Dec. 23, 1992]
§ 75.605 Clamping of trailing cables to
equipment.
[STATUTORY PROVISIONS]
kpayne on VMOFRWIN702 with $$_JOB
Protection of trailing cables.
Trailing cables shall be clamped to
machines in a manner to protect the
Trailing cable and power cable connections to junction boxes shall not be
made or broken under load.
Subpart H—Grounding
§ 75.700 Grounding metallic sheaths,
armors, and conduits enclosing
power conductors.
[STATUTORY PROVISIONS]
All metallic sheaths, armors, and
conduits enclosing power conductors
shall
be
electrically
continuous
throughout and shall be grounded by
methods approved by an authorized
representative of the Secretary.
§ 75.700–1 Approved
grounding.
methods
Metallic sheaths, armors and conduits in resistance grounded systems
where the enclosed conductors are a
part of the system will be approved if a
solid connection is made to the neutral
conductor; in all other systems, the
following methods of grounding will be
approved:
(a) A solid connection to a borehole
casing having low resistance to earth;
(b) A solid connection to metal
waterlines having low resistance to
earth;
(c) A solid connection to a grounding
conductor, other than the neutral conductor of a resistance grounded system, extending to a low resistance
ground field located on the surface;
(d) Any other method of grounding,
approved by an authorized representative of the Secretary, which ensures
that there is no difference in potential
between such metallic enclosures and
the earth.
577
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00587
Fmt 8010
of
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.701
30 CFR Ch. I (7–1–19 Edition)
§ 75.701 Grounding metallic frames,
casings, and other enclosures of
electric equipment.
[STATUTORY PROVISIONS]
Metallic frames, casings, and other
enclosures of electric equipment that
can become ‘‘alive’’ through failure of
insulation or by contact with energized
parts shall be grounded by methods approved by an authorized representative
of the Secretary.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.701–1 Approved
methods
of
grounding of equipment receiving
power from ungrounded alternating
current power systems.
For purposes of grounding metallic
frames, casings and other enclosures of
equipment
receiving
power
from
ungrounded alternating current power
systems, the following methods of
grounding will be approved:
(a) A solid connection between the
metallic frame, casing, or other metal
enclosure and the grounded metallic
sheath, armor, or conduit enclosing the
power conductor feeding the electrical
equipment enclosed;
(b) A solid connection to a borehole
casing having low resistance to earth;
(c) A solid connection to metal
waterlines having low resistance to
earth;
(d) A solid connection to a grounding
conductor extending to a low resistance ground field located on the surface;
(e) Any other method of grounding,
approved by an authorized representative of the Secretary, which ensures
that there is no difference in potential
between such metal enclosures and the
earth.
§ 75.701–2 Approved method of grounding metallic frames, casings and
other enclosures receiving power
from single-phase 110–220-volt circuit.
In instances where single-phase 110–
220-volt circuits are used to feed electrical equipment, the only method of
grounding that will be approved is the
connection of all metallic frames, casings and other enclosures of such
equipment to a separate grounding
conductor which establishes a continuous connection to a grounded center
tap of the transformer.
§ 75.701–3 Approved
methods
of
grounding metallic frames, casings
and other enclosures of electric
equipment receiving power from direct current power systems with
one polarity grounded.
For the purpose of grounding metallic frames, casings and enclosures of
any electric equipment or device-receiving power from a direct-current
power system with one polarity
grounded, the following methods of
grounding will be approved:
(a) A solid connection to the mine
track;
(b) A solid connection to the grounded power conductor of the system;
(c) Silicon diode grounding; however,
this method shall be employed only
when such devices are installed in accordance with the requirements set
forth in paragraph (d) of § 75.703–3; and
(d) Any other method, approved by
an authorized representative of the
Secretary, which insures that there is
no difference in potential between such
metal enclosures and the earth.
§ 75.701–4 Grounding wires; capacity
of wires.
Where grounding wires are used to
ground metallic sheaths, armors, conduits, frames, casings, and other metallic enclosures, such grounding wires
will be approved if:
(a) The cross-sectional area (size) of
the grounding wire is at least one-half
the cross-sectional area (size) of the
power conductor where the power conductor used is No. 6 A.W.G., or larger.
(b) Where the power conductor used
is less than No. 6 A.W.G., the cross-sectional area (size) of the grounding wire
is equal to the cross-sectional area
(size) of the power conductor.
§ 75.701–5
tors.
Use of grounding connec-
The attachment of grounding wires
to a mine track or other grounded
power conductor will be approved if
separate clamps, suitable for such purpose, are used and installed to provide
a solid connection.
578
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00588
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.703–3
§ 75.702 Protection other than grounding.
a medium is used, a separate grounding
conductor must be employed.
[STATUTORY PROVISIONS]
§ 75.703–3 Approved
methods
of
grounding offtrack mobile, portable
and stationary direct-current machines.
Methods other than grounding which
provide no less effective protection
may be permitted by the Secretary or
his authorized representative.
§ 75.702–1 Protection
other
than
grounding; approved by an authorized representative of the Secretary.
Under this subpart no method other
than grounding may be used to ensure
against a difference in potential between metallic sheaths, armors and
conduits, enclosing power conductors
and frames, casings and metal enclosures of electric equipment, and the
earth, unless approved by an authorized representative of the Secretary.
§ 75.703 Grounding offtrack direct-current machines and the enclosures of
related detached components.
[STATUTORY PROVISIONS]
The frames of all offtrack direct-current machines and the enclosures of related detached components shall be effectively grounded, or otherwise maintained at no less safe voltages, by
methods approved by an authorized
representative of the Secretary.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.703–1 Approved method of grounding.
In instances where the metal frames
both of an offtrack direct-current machine and of the metal frames of its
component parts are grounded to the
same grounding medium the requirements of § 75.703 will be met.
§ 75.703–2 Approved grounding mediums.
For purposes of grounding offtrack
direct-current machines, the following
grounding mediums are approved:
(a) The grounded polarity of the direct-current power system feeding such
machines; or,
(b) The alternating current grounding medium where such machines are
fed by an ungrounded direct-current
power system originating in a portable
rectifier receiving its power from a section power center. However, when such
In grounding offtrack direct-current
machines and the enclosures of their
component parts, the following methods of grounding will meet the requirements of § 75.703:
(a) The use of a separate grounding
conductor located within the trailing
cable of mobile and portable equipment
and connected between such equipment
and the direct-current grounding medium;
(b) The use of a separate ground conductor located within the direct-current power cable feeding stationary
equipment and connected between such
stationary equipment and the directcurrent grounding medium;
(c) The use of a separate external
ground conductor connected between
stationary equipment and the directcurrent grounding medium; or,
(d) The use of silicon diodes; however,
the installation of such devices shall
meet the following minimum requirements:
(1) Installation of silicon diodes shall
be restricted to electric equipment receiving power from a direct-current
system with one polarity grounded;
(2) Where such diodes are used on circuits having a nominal voltage rating
of 250, they must have a forward current rating of 400 amperes or more, and
have a peak inverse voltage rating of
400 or more;
(3) Where such diodes are used on circuits having a nominal voltage rating
of 550, they must have a forward current rating of 250 amperes or more, and
have a peak inverse voltage rating of
800 or more;
(4) Where fuses approved by the Secretary are used at the outby end of a
trailing cable connected to electrical
equipment employing silicon diodes,
the rating of such fuses must not exceed 150 percent of the nominal current
rating of the grounding diodes;
(5) Where circuit breakers are used at
the outby end of a trailing cable connected to electrical equipment employing silicon diodes, the instantaneous
579
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00589
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.703–4
30 CFR Ch. I (7–1–19 Edition)
trip setting shall not exceed 300 percent of the nominal current rating of
the grounding diode;
(6) Overcurrent devices must be used
and installed in such a manner that the
operating coil circuit of the main contactor will open when a fault current
with a value of 25 percent or less of the
diode rating flows through the diode;
(7) The silicon diode installed must
be suitable to the grounded polarity of
the power system in which it is used
and its threaded base must be solidly
connected to the machine frame on
which it is installed;
(8) In addition to the grounding
diode, a polarizing diode must be installed in the machine control circuit
to prevent operation of the machine
when the polarity of a trailing cable is
reversed;
(9) When installed on permissible
equipment, all grounding diodes, overcurrent devices, and polarizing diodes
must be placed in explosion proof compartments;
(10) When grounding diodes are installed on a continuous miner, their
nominal diode current rating must be
at least 750 amperes or more; and,
(11) All grounding diodes shall be
tested, examined and maintained as
electrical equipment in accordance
with the provisions of § 75.512.
§ 75.703–4 Other methods of protecting
offtrack direct-current equipment;
approved by an authorized representative of the Secretary.
Other methods of maintaining safe
voltage by preventing a difference between the frames of offtract direct-current machines and the earth must be
approved by an authorized representative of the Secretary.
§ 75.704 Grounding frames of stationary high-voltage equipment receiving power from ungrounded
delta systems.
kpayne on VMOFRWIN702 with $$_JOB
[STATUTORY PROVISIONS]
The frames of all stationary highvoltage equipment receiving power
from ungrounded delta systems shall
be grounded by methods approved by
an authorized representative of the
Secretary.
§ 75.704–1 Approved
methods
of
grounding.
The methods of grounding stated in
§ 75.701–1 will also be approved with respect to the grounding of frames of
high-voltage equipment referred to in
§ 75.704.
§ 75.705 Work on high-voltage lines;
deenergizing and grounding.
[STATUTORY PROVISIONS]
High-voltage lines, both on the surface and underground, shall be deenergized and grounded before work is performed on them, except that repairs
may be permitted, in the case of energized surface high-voltage lines, if such
repairs are made by a qualified person
in accordance with procedures and
safeguards, including, but not limited
to, a requirement that the operator of
such mine provide, test, and maintain
protective devices in making such repairs, to be prescribed by the Secretary
prior to March 30, 1970.
§ 75.705–1 Work on high-voltage lines.
(a) Section 75.705 specifically prohibits work on energized high-voltage
lines underground;
(b) No high-voltage line, either on
the surface or underground, shall be regarded as deenergized for the purpose
of performing work on it, until it has
been determined by a qualified person
(as provided in § 75.153) that such highvoltage line has been deenergized and
grounded. Such qualified person shall
by visual observation (1) determine
that the disconnecting devices on the
high-voltage circuit are in open position and (2) ensure that each
ungrounded conductor of the high-voltage circuit upon which work is to be
done is properly connected to the system-grounding medium. In the case of
resistance grounded or solid wye-connected systems, the neutral wire is the
system-grounding medium. In the case
of an ungrounded power system, either
the steel armor or conduit enclosing
the system or a surface grounding field
is a system grounding medium;
(c) No work shall be performed on
any high-voltage line on the surface
which is supported by any pole or
structure which also supports other
high-voltage lines until: (1) All lines
580
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00590
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.705–6
supported on the pole or structure are
deenergized and grounded in accordance with all of the provisions of this
section which apply to the repair of energized surface high-voltage lines; or
(2) the provisions of §§ 75.705–2 through
75.705–10 have been complied with, with
respect to all lines, which are supported on the pole or structure.
(d) Work may be performed on energized surface high-voltage lines only in
accordance with the provisions of
§§ 75.705–2 through 75.705–10, inclusive.
(5) Such other information as the
person designated by the operator feels
necessary to describe properly the
means or methods to be employed in
such repairs.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.705–2 Repairs to energized surface
high-voltage lines.
An energized high-voltage surface
line may be repaired only when
(a) The operator has determined that:
(1) Such repairs cannot be scheduled
during a period when the power circuit
could be properly deenergized and
grounded;
(2) Such repairs will be performed on
power circuits with a phase-to-phase
nominal voltage no greater than 15,000
volts;
(3) Such repairs on circuits with a
phase-to-phase nominal voltage of 5,000
volts or more will be performed only
with the use of live line tools;
(4) Weather conditions will not interfere with such repairs or expose those
persons assigned to such work to an
imminent danger; and
(b) The operator has designated a
person qualified under the provisions of
§ 75.154 as the person responsible for
carrying out such repairs and such person, in order to ensure protection for
himself and other qualified persons assigned to perform such repairs from the
hazards of such repair, has prepared
and filed with the operator:
(1) A general description of the nature and location of the damage or defect to be repaired;
(2) The general plan to be followed in
making such repairs;
(3) A statement that a briefing of all
qualified persons assigned to make
such repairs was conducted informing
them of the general plan, their individual assignments, and the dangers inherent in such assignments;
(4) A list of the proper protective
equipment and clothing that will be
provided; and
§ 75.705–3 Work on energized highvoltage surface lines; reporting.
Any operator designating and assigning qualified persons to perform repairs
on energized high-voltage surface lines
under the provisions of § 75.705–2 shall
maintain a record of such repairs. Such
record shall contain a notation of the
time, date, location, and general nature of the repairs made, together with
a copy of the information filed with the
operator by the qualified person designated as responsible for performing
such repairs.
§ 75.705–4 Simultaneous repairs.
When two or more persons are working on an energized high-voltage surface line simultaneously, and any one
of them is within reach of another,
such persons shall not be allowed to
work on different phases or on equipment with different potentials.
§ 75.705–5 Installation of protective
equipment.
Before repair work on energized highvoltage surface lines is begun, protective equipment shall be used to cover
all bare conductors, ground wires,
guys, telephone lines, and other attachments in proximity to the area of
planned repairs. Such protective equipment shall be installed from a safe position below the conductors or other
apparatus being covered. Each rubber
protective device employed in the making of repairs shall have a dielectric
strength of 20,000 volts, or more.
§ 75.705–6 Protective clothing; use and
inspection.
All persons performing work on energized high-voltage surface lines shall
wear protective rubber gloves, sleeves,
and climber guards if climbers are
worn. Protective rubber gloves shall
not be worn wrong side out or without
protective leather gloves. Protective
devices worn by a person assigned to
perform repairs on high-voltage surface
lines shall be worn continuously from
the time he leaves the ground until he
581
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00591
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.705–7
30 CFR Ch. I (7–1–19 Edition)
returns to the ground, and, if such devices are employed for extended periods, such person shall visually inspect
the equipment assigned him for defects
before each use and, in no case, less
than twice each day.
§ 75.705–7 Protective
spection.
equipment;
in-
Each person shall visually inspect
protective equipment and clothing provided him in connection with work on
high-voltage surface lines before using
such equipment and clothing, and any
equipment or clothing containing any
defect or damage shall be discarded and
replaced with proper protective equipment or clothing prior to the performance of any electrical work on such
lines.
§ 75.705–8 Protective equipment; testing and storage.
(a) All rubber protective equipment
used on work on energized high-voltage
surface lines shall be electrically tested by the operator in accordance with
ASTM standards, Part 28, published
February 1968, and such testing shall be
conducted in accordance with the following schedule:
(1) Rubber gloves, once each month;
(2) Rubber sleeves, once every 3
months;
(3) Rubber blankets, once every 6
months;
(4) Insulator hoods and line hose,
once a year; and
(5) Other electric protective equipment, once a year.
(b) Rubber gloves shall not be stored
wrong side out. Blankets shall be rolled
when not in use, and line hose and insulator hoods shall be stored in their
natural position and shape.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.705–9 Operating disconnecting or
cutout switches.
Disconnecting or cutout switches on
energized high-voltage surface lines
shall be operated only with insulated
sticks, fuse tongs, or pullers which are
adequately insulated and maintained
to protect the operator from the voltage to which he is exposed. When such
switches are operated from the ground,
the person operating such devices shall
wear protective rubber gloves.
§ 75.705–10 Tying into energized highvoltage surface circuits.
If the work of forming an additional
circuit by tying into an energized highvoltage surface line is performed from
the ground, any person performing
such work must wear and employ all of
the protective equipment and clothing
required under the provisions of
§§ 75.705–5 and 75.705–6. In addition, the
insulated stick used by such person
must have been designed for such purpose and must be adequately insulated
and be maintained to protect such person from the voltage to which he is exposed.
§ 75.705–11 Use of grounded messenger
wires; ungrounded systems.
Solely for purposes of grounding
ungrounded high-voltage power systems, grounded messenger wires used
to suspend the cables of such systems
may be used as a grounding medium.
§ 75.706 Deenergized
underground
power circuits; idle days—idle
shifts.
[STATUTORY PROVISIONS]
When not in use, power circuits underground shall be deenergized on idle
days and idle shifts, except that rectifiers and transformers may remain energized.
Subpart I—Underground HighVoltage Distribution
§ 75.800 High-voltage circuits; circuit
breakers.
[STATUTORY PROVISIONS]
High-voltage circuits entering the
underground area of any coal mine
shall be protected by suitable circuit
breakers of adequate interrupting capacity which are properly tested and
maintained as prescribed by the Secretary. Such breakers shall be equipped
with devices to provide protection
against under-voltage grounded phase,
short circuit, and overcurrent.
§ 75.800–1 Circuit breakers; location.
Circuit breakers protecting highvoltage circuits entering an underground area of any coal mine shall be
located on the surface and in no case
582
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00592
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.802
installed either underground or within
a drift.
to be secure and not susceptible to alteration.
(c) Retention and access. These records
shall be retained at a surface location
at the mine for at least one year and
shall be made available to authorized
representatives of the Secretary, the
representative of miners, and other interested persons.
§ 75.800–2
Approved circuit schemes.
The following circuit schemes will be
regarded as providing the necessary
protection to the circuits required by
§ 75.800:
(a) Ground check relays may be used
for undervoltage protection if the relay
coils are designed to trip the circuit
breaker when line voltage decreases to
40 percent to 60 percent of the nominal
line voltage;
(b) Ground trip relays on resistance
grounded systems will be acceptable as
grounded phase protection;
(c) One circuit breaker may be used
to protect two or more branch circuits,
if the circuit breaker is adjusted to afford overcurrent protection for the
smallest conductor.
§ 75.800–3 Testing, examination and
maintenance of circuit breakers;
procedures.
kpayne on VMOFRWIN702 with $$_JOB
(a) Circuit breakers and their auxiliary devices protecting underground
high-voltage circuits shall be tested
and examined at least once each month
by a person qualified as provided in
§ 75.153;
(b) Tests shall include: (1) Breaking
continuity of the ground check conductor, where ground check monitoring
is used; and
(2) Actuating at least two (2) of the
auxiliary protective relays.
(c) Examination shall include visual
observation of all components of the
circuit breaker and its auxiliary devices, and such repairs or adjustments
as are indicated by such tests and examinations shall be carried out immediately.
§ 75.800–4 Testing, examination, and
maintenance of circuit breakers;
record.
(a) Recordkeeping. The operator shall
make a record of each test, examination, repair, or adjustment of all circuit breakers protecting high-voltage
circuits which enter any underground
area of the mine.
(b) Record security. These records
shall be made in a secure book that is
not susceptible to alteration or electronically in a computer system so as
[64 FR 43287, Aug. 10, 1999]
§ 75.801
Grounding resistors.
[STATUTORY PROVISIONS]
The grounding resistor, where required, shall be of the proper ohmic
value to limit the voltage drop in the
grounding circuit external to the resistor to not more than 100 volts under
fault conditions. The grounding resistor shall be rated for maximum fault
current continuously and insulated
from ground for a voltage equal to the
phase-to-phase voltage of the system.
§ 75.802 Protection of high-voltage circuits extending underground.
(a) Except as provided in paragraph
(b) of this section, high-voltage circuits extending underground and supplying portable, mobile, or, stationary
high-voltage equipment shall contain
either a direct or derived neutral which
shall be grounded through a suitable
resistor at the source transformers,
and a grounding circuit, originating at
the grounded side of the grounding resistor, shall extend along with the
power conductors and serve as a
grounding conductor for the frames of
all high-voltage equipment supplied
power from that circuit.
(b) Notwithstanding the requirements of paragraph (a) of this section,
the Secretary or his authorized representative may permit ungrounded
high-voltage circuits to be extended
underground to feed stationary electric
equipment if:
(1) Such circuits are either steel armored or installed in grounded, rigid
steel conduit throughout their entire
length; or,
(2) The voltage of such circuits is
nominally 2,400 volts or less phase-tophase and the cables used in such circuits are equipped with metallic
shields around each power conductor,
583
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00593
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.803
30 CFR Ch. I (7–1–19 Edition)
and contain one or more ground conductors having a total cross sectional
area of not less than one-half the power
conductor; and,
(3) Upon a finding by the Secretary
or his authorized representative that
the use of the circuits described in
paragraphs (b) (1) and (2) of this section
does not pose a hazard to the miners.
(c) Within 100 feet of the point on the
surface where high-voltage circuits
enter the underground portion of the
mine, disconnecting devices shall be installed and so equipped or designed in
such a manner that it can be determined by visual observation that the
power is disconnected, except that the
Secretary or his authorized representative may permit such devices to be installed at a greater distance from such
area of the mine if he determines,
based on existing physical conditions,
that such installation will be more accessible at a greater distance and will
not pose any hazard to the miners.
[38 FR 4975, Feb. 23, 1973]
§ 75.803 Fail safe ground check circuits on high-voltage resistance
grounded systems.
§ 75.803–2 Ground check systems not
employing pilot check wires; approval by the Secretary.
Ground check systems not employing
pilot check wires will be approved only
if it is determined that the system includes a fail safe design causing the
circuit breaker to open when ground
continuity is broken.
§ 75.804 Underground high-voltage cables.
(a) Underground high-voltage cables
used in resistance grounded systems
shall be equipped with metallic shields
around each power conductor with one
or more ground conductors having a
total cross sectional area of not less
than one-half the power conductor, and
with an insulated external conductor
not smaller than No. 8 (A.W.G.) or an
insulated internal ground check conductor not smaller than No. 10 (A.W.G.)
for the ground continuity check circuit.
(b) All such cables shall be adequate
for the intended current and voltage.
Splices made in such cables shall provide continuity of all components.
[STATUTORY PROVISIONS]
[38 FR 4976, Feb. 23, 1973]
On and after September 30, 1970, highvoltage, resistance grounded systems
shall include a fail safe ground check
circuit to monitor continuously the
grounding circuit to assure continuity
and the fail safe ground check circuit
shall cause the circuit breaker to open
when either the ground or pilot check
wire is broken, or other no less effective device approved by the Secretary
or his authorized representative to assure such continuity, except that an
extension of time, not in excess of 12
months, may be permitted by the Secretary on a mine-by-mine basis if he
determines that such equipment is not
available.
§ 75.803–1 Maximum
check circuits.
voltage
ground
kpayne on VMOFRWIN702 with $$_JOB
The maximum voltage used for
ground check circuits under § 75.803
shall not exceed 96 volts.
§ 75.805
Couplers.
[STATUTORY PROVISIONS]
Couplers that are used with mediumvoltage or high-voltage power circuits
shall be of the three-phase type with a
full metallic shell, except that the Secretary may permit, under such guidelines as he may prescribe, no less effective couplers constructed of materials
other than metal. Couplers shall be
adequate for the voltage and current
expected. All exposed metal on the metallic couplers shall be grounded to the
ground conductor in the cable. The
coupler shall be constructed so that
the ground check continuity conductor
shall be broken first and the ground
conductors shall be broken last when
the coupler is being uncoupled.
584
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00594
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.806 Connection
loads.
of
single-phase
§ 75.811 High-voltage
underground
equipment; grounding.
[STATUTORY PROVISIONS]
[STATUTORY PROVISIONS]
Single-phase loads, such as transformer primaries, shall be connected
phase-to-phase.
Frames, supporting structures and
enclosures of stationary, portable, or
mobile
underground
high-voltage
equipment and all high-voltage equipment supplying power to such equipment receiving power from resistance
grounded systems shall be effectively
grounded to the high-voltage ground.
§ 75.807 Installation of
transmission cables.
high-voltage
[STATUTORY PROVISIONS]
All underground high-voltage transmission cables shall be installed only
in regularly inspected air courses and
haulageways, and shall be covered, buried, or placed so as to afford protection
against damage, guarded where men
regularly work or pass under them unless they are 61⁄2 feet or more above the
floor or rail, securely anchored, properly insulated, and guarded at ends,
and covered, insulated, or placed to
prevent contact with trolley wires and
other low-voltage circuits.
§ 75.808
Disconnecting devices.
[STATUTORY PROVISIONS]
Disconnecting devices shall be installed at the beginning of branch lines
in high-voltage circuits and equipped
or designed in such a manner that it
can be determined by visual observation that the circuit is deenergized
when the switches are open.
§ 75.809 Identification of circuit breakers and disconnecting switches.
[STATUTORY PROVISIONS]
Circuit breakers and disconnecting
switches underground shall be marked
for identification.
§ 75.810 High-voltage
splices.
trailing
cables;
[STATUTORY PROVISIONS]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.812–1
In the case of high-voltage cables
used as trailing cables, temporary
splices shall not be used and all permanent splices shall be made in accordance with § 75.604. Terminations and
splices in all other high-voltage cables
shall be made in accordance with the
manufacturer’s specifications.
§ 75.812 Movement
of
high-voltage
power centers and portable transformers; permit.
[STATUTORY PROVISIONS]
Power centers and portable transformers shall be deenergized before
they are moved from one location to
another, except that, when equipment
powered by sources other than such
centers or transformers is not available, the Secretary may permit such
centers and transformers to be moved
while energized, if he determines that
another equivalent or greater hazard
may otherwise be created, and if they
are moved under the supervision of a
qualified person, and if such centers
and transformers are examined prior to
such movement by such person and
found to be grounded by methods approved by an authorized representative
of the Secretary and otherwise protected from hazards to the miner. A
record shall be kept of such examinations. High-voltage cables, other than
trailing cables, shall not be moved or
handled at any time while energized,
except that, when such centers and
transformers are moved while energized as permitted under this section,
energized high-voltage cables attached
to such centers and transformers may
be moved only by a qualified person
and the operator of such mine shall require that such person wear approved
and tested insulated wireman’s gloves.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.812–1
Qualified person.
A person who meets the requirements
of § 75.153 is a qualified person within
the meaning of § 75.812.
585
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00595
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.812–2
30 CFR Ch. I (7–1–19 Edition)
§ 75.812–2 High-voltage power centers
and transformers; record of examination.
The operator shall maintain a
of all examinations conducted
cordance with § 75.812. Such
shall be kept in a book approved
Secretary.
record
in acrecord
by the
HIGH-VOLTAGE LONGWALLS
SOURCE: 67 FR 11001, Mar. 11, 2002, unless
otherwise noted.
§ 75.813
High-voltage longwalls; scope.
Sections 75.814 through 75.822 of this
part are electrical safety standards
that apply to high-voltage longwall circuits and equipment. All other existing
standards in 30 CFR must also apply to
these longwall circuits and equipment
where appropriate.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.814
Electrical protection.
(a) High-voltage circuits must be protected against short circuits, overloads, ground faults, and undervoltages
by circuit-interrupting devices of adequate interrupting capacity as follows:
(1) Current settings of short-circuit
protective devices must not exceed the
setting specified in approval documentation, or seventy-five percent of
the minimum available phase-to-phase
short-circuit current, whichever is less.
(2) Time-delay settings of short-circuit protective devices used to protect
any cable extending from the section
power center to a motor-starter enclosure must not exceed the settings specified in approval documentation, or
0.25-second, whichever is less. Time
delay settings of short-circuit protective devices used to protect motor and
shearer circuits must not exceed the
settings specified in approval documentation, or 3 cycles, whichever is
less.
(3) Ground-fault currents must be
limited by a neutral grounding resistor
to not more than—
(i) 6.5 amperes when the nominal
voltage of the power circuit is 2,400
volts or less; or
(ii) 3.75 amperes when the nominal
voltage of the power circuit exceeds
2,400 volts.
(4) High-voltage circuits extending
from the section power center must be
provided with—
(i) Ground-fault protection set to
cause deenergization at not more than
40 percent of the current rating of the
neutral grounding resistor;
(ii) A backup ground-fault detection
device to cause deenergization when a
ground fault occurs with the neutral
grounding resistor open; and
(iii) Thermal protection for the
grounding resistor that will deenergize
the longwall power center if the resistor is subjected to a sustained ground
fault. The thermal protection must operate at either 50 percent of the maximum temperature rise of the grounding resistor, or 150 °C (302 °F), whichever is less, and must open the groundwire monitor circuit for the high-voltage circuit supplying the section power
center. The thermal protection must
not be dependent upon control power
and may consist of a current transformer and overcurrent relay.
(5) High-voltage motor and shearer
circuits must be provided with instantaneous ground-fault protection set at
not more than 0.125-ampere.
(6) Time-delay settings of groundfault protective devices used to provide
coordination with the instantaneous
ground-fault protection of motor and
shearer circuits must not exceed 0.25second.
(7) Undervoltage protection must be
provided by a device which operates on
loss of voltage to cause and maintain
the interruption of power to a circuit
to prevent automatic restarting of the
equipment.
(b) Current transformers used for the
ground-fault protection specified in
paragraphs (a)(4)(i) and (5) of this section must be single window-type and
must be installed to encircle all three
phase conductors. Equipment safety
grounding conductors must not pass
through or be connected in series with
ground-fault current transformers.
(c) Each ground-fault current device
specified in paragraphs (a)(4)(i) and (5)
of this section must be provided with a
test circuit that will inject a primary
current of 50 percent or less of the current rating of the grounding resistor
through the current transformer and
586
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00596
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.818
cause each corresponding circuit-interrupting device to open.
(d) Circuit-interrupting devices must
not reclose automatically.
(e) Where two or more high-voltage
cables are used to supply power to a
common bus in a high-voltage enclosure, each cable must be provided with
ground-wire monitoring. The groundwire monitoring circuits must cause
deenergization of each cable when either the ground-monitor or grounding
conductor(s) of any cable become severed or open. On or after May 10, 2002,
parallel connected cables on newly installed longwalls must be protected as
follows:
(1) When one circuit-interrupting device is used to protect parallel connected cables, the circuit-interrupting
device must be electrically interlocked
with the cables so that the device will
open when any cable is disconnected;
or
(2) When two or more parallel circuitinterrupting devices are used to protect parallel connected cables, the circuit-interrupting devices must be mechanically and electrically interlocked.
Mechanical interlocking must cause all
devices to open simultaneously and
electrical interlocking must cause all
devices to open when any cable is disconnected.
of the circuit that is supplied power
through the device.
(d) Each disconnecting device must
be designed and installed so that—
(1) Visual observation determines
that the contacts are open without removing any cover;
(2) All load power conductors can be
grounded when the device is in the
‘‘open’’ position; and
(3) The device can be locked in the
‘‘open’’ position.
(e) Disconnecting devices, except
those installed in explosion-proof enclosures, must be capable of interrupting the full-load current of the circuit or designed and installed to cause
the current to be interrupted automatically prior to the opening of the
contacts of the device. Disconnecting
devices installed in explosion-proof enclosures must be maintained in accordance with the approval requirements of
paragraph (f)(2)(iv) of § 18.53 of part 18
of this chapter.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.815
Disconnect devices.
(a) The section power center must be
equipped with a main disconnecting device installed to deenergize all cables
extending to longwall equipment when
the device is in the ‘‘open’’ position.
See Figures I-1 and I-2 in Appendix A
to this subpart I.
(b) Disconnecting devices for motorstarter enclosures must be maintained
in accordance with the approval requirements of paragraph (f) of § 18.53 of
part 18 of this chapter. The compartment for the disconnect device must be
provided with a caution label to warn
miners against entering the compartment before deenergizing the incoming
high-voltage circuits to the compartment.
(c) Disconnecting devices must be
rated for the maximum phase-to-phase
voltage of the circuit in which they are
installed, and for the full-load current
§ 75.816 Guarding of cables.
(a) High-voltage cables must be
guarded at the following locations:
(1) Where persons regularly work or
travel over or under the cables.
(2) Where the cables leave cable handling or support systems to extend to
electric components.
(b) Guarding must minimize the possibility of miners contacting the cables
and protect the cables from damage.
The guarding must be made of grounded metal or nonconductive flame-resistant material.
§ 75.817 Cable handling and support
systems.
Longwall mining equipment must be
provided with cable-handling and support systems that are constructed, installed and maintained to minimize the
possibility of miners contacting the cables and to protect the high-voltage cables from damage.
§ 75.818 Use of insulated cable handling equipment.
(a) Energized high-voltage cables
must not be handled except when
motor or shearer cables need to be
trained. When cables need to be
trained, high-voltage insulated gloves,
mitts, hooks, tongs, slings, aprons, or
587
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00597
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.819
30 CFR Ch. I (7–1–19 Edition)
other personal protective equipment
capable of providing protection against
shock hazard must be used to prevent
direct contact with the cable.
(b) High-voltage insulated gloves,
sleeves, and other insulated personal
protective equipment must—
(1) Have a voltage rating of at least
Class 1 (7,500 volts) that meets or exceeds ASTM F496–97, ‘‘Standard Specification for In-Service Care of Insulating Gloves and Sleeves’’ (1997).
(2) Be examined before each use for
visible signs of damage;
(3) Be removed from the underground
area of the mine or destroyed when
damaged or defective; and
(4) Be electrically tested every 6
months in accordance with publication
ASTM F496–97. ASTM F496–97 (Standard Specification for In-Service Care of
Insulating Gloves and Sleeves, 1997) is
incorporated by reference and may be
inspected at any MSHA Coal Mine
Safety and Health District Office, or at
MSHA’s Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; and at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html. In addition, copies
of the document can be purchased from
the American Society for Testing and
Materials, 100 Barr Harbor Drive, P.O.
Box C700, West Conshohocken, PA
19428–2959;
610–832–9500;
http://
www.astm.org. This incorporation by
reference was approved by the Director
of the Federal Register in accordance
with 5 U.S.C. 552(a) and 1 CFR part 51.
[67 FR 11001, Mar. 11, 2002, as amended at 67
FR 38386, June 4, 2002; 71 FR 16668, Apr. 3,
2006; 80 FR 52992, Sept. 2, 2015]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.819 Motor-starter enclosures; barriers and interlocks.
Compartment separation and cover
interlock switches for motor-starter
enclosures must be maintained in accordance with the approval requirements of paragraphs (a) and (b) of
§ 18.53 of part 18 of this chapter.
§ 75.820 Electrical
work;
shooting and testing.
(a) Electrical work on all circuits and
equipment associated with high-voltage longwalls must be performed only
by persons qualified under § 75.153 to
perform electrical work on all circuits
and equipment.
(b) Prior to performing electrical
work, except for troubleshooting and
testing of energized circuits and equipment as provided for in paragraph (d)
of this section, a qualified person must
do the following:
(1) Deenergize the circuit or equipment with a circuit-interrupting device.
(2) Open the circuit disconnecting device. On high-voltage circuits, ground
the power conductors until work on the
circuit is completed.
(3) Lock out the disconnecting device
with a padlock. When more than one
qualified person is performing work,
each person must install an individual
padlock.
(4) Tag the disconnecting device to
identify each person working and the
circuit or equipment on which work is
being performed.
(c) Each padlock and tag must be removed only by the person who installed
them, except that, if that person is unavailable at the mine, the lock and tag
may be removed by a person authorized
by the operator, provided—
(1) The authorized person is qualified
under paragraph (a) of this section; and
(2) The operator ensures that the person who installed the lock and tag is
aware of the removal before that person resumes work on the affected circuit or equipment.
(d) Troubleshooting and testing of
energized circuits must be performed
only—
(1) On low- and medium-voltage circuits;
(2) When the purpose of troubleshooting and testing is to determine
voltages and currents; and
(3) By persons qualified to perform
electrical work and who wear protective gloves on circuits that exceed 40
volts in accordance with the following
table:
588
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00598
Fmt 8010
trouble-
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
Circuit voltage
Type of glove required
Greater than 120 volts (nominal) (not intrinsically safe) ............................
40 volts to 120 volts (nominal) (both intrinsically safe and non-intrinsically safe).
Greater than 120 volts (nominal) (intrinsically safe) ..................................
Rubber insulating gloves with leather protectors.
Either rubber insulating gloves with leather protectors
or dry work gloves.
Either rubber insulating gloves with leather protectors
or dry work gloves.
(4) Rubber insulating gloves must be
rated at least for the nominal voltage
of the circuit when the voltage of the
circuit exceeds 120 volts nominal and is
not intrinsically safe.
(e) Before troubleshooting and testing a low- or medium-voltage circuit
contained in a compartment with a
high-voltage circuit, the high-voltage
circuit must be deenergized, disconnected, grounded, locked out and
tagged in accordance with paragraph
(b) of this section.
(f) Prior to the installation or removal of conveyor belt structure, highvoltage cables extending from the section power center to longwall equipment and located in the belt entries
must be:
(1) Deenergized; or
(2) Guarded in accordance with
§ 75.816 of this part, at the location
where the belt structure is being installed or removed; or
(3) Located at least 6.5 feet above the
mine floor.
§ 75.821 Testing,
maintenance.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.824
examination
and
(a) At least once every 7 days, a person qualified in accordance with § 75.153
to perform electrical work on all circuits and equipment must test and examine each unit of high-voltage
longwall equipment and circuits to determine that electrical protection,
equipment grounding, permissibility,
cable insulation, and control devices
are being properly maintained to prevent fire, electrical shock, ignition, or
operational hazards from existing on
the equipment. Tests must include activating the ground-fault test circuit
as required by § 75.814(c).
(b) Each ground-wire monitor and associated circuits must be examined and
tested at least once each 30 days to
verify proper operation and that it will
cause the corresponding circuit-interrupting device to open.
(c) When examinations or tests of
equipment reveal a fire, electrical
shock, ignition, or operational hazard,
the equipment must be removed from
service immediately or repaired immediately.
(d) At the completion of examinations and tests required by this section, the person who makes the examinations and tests must certify by signature and date that they have been
conducted. A record must be made of
any unsafe condition found and any
corrective action taken. Certifications
and records must be kept for at least
one year and must be made available
for inspection by authorized representatives of the Secretary and representatives of miners.
§ 75.822 Underground
longwall cables.
In addition to the high-voltage cable
design specifications in § 75.804 of this
part, high-voltage cables for use on
longwalls may be a type SHD cable
with a center ground-check conductor
no smaller than a No. 16 AWG stranded
conductor. The cables must be MSHA
accepted as flame-resistant under part
18 or approved under subpart K of part
7.
§ 75.823
Scope.
Sections 75.823 through 75.834 of this
part are electrical safety standards applicable to 2,400 volt continuous mining
machines and circuits. A ‘‘qualified
person’’ as used in these sections
means a person meeting the requirements of § 75.153. Other standards in 30
CFR apply to these circuits and equipment where appropriate.
[75 FR 17549, Apr. 6, 2010]
§ 75.824
Electrical protection.
(a) Trailing cable protection. The trailing cable extending to the high-voltage
continuous mining machine must be
589
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00599
Fmt 8010
high-voltage
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.825
30 CFR Ch. I (7–1–19 Edition)
protected by a circuit-interrupting device of adequate interrupting capacity
and voltage that provides short-circuit,
overload, ground-fault, and under-voltage protection as follows:
(1) Short-circuit protection.
(i) The current setting of the device
must be the setting specified in the approval documentation or 75 percent of
the minimum available phase-to-phase
short-circuit current, whichever is less;
and
(ii) The time-delay setting must not
exceed 0.050 seconds.
(2) Ground-fault protection.
(i) Neutral grounding resistors must
limit the ground-fault current to no
more than 0.5 ampere.
(ii) Ground-fault devices must cause
de-energization of the circuit extending to the continuous mining machine
at not more than 0.125 ampere. The
time-delay of the device must not exceed 0.050 seconds.
(iii) Look-ahead circuits must detect
a ground-fault condition and prevent
the circuit-interrupting device from
closing as long as the ground-fault condition exists.
(iv) Backup ground-fault devices
must cause de-energization of the circuit extending to the continuous mining machine at not more than 40 percent of the voltage developed across
the neutral grounding resistor when a
ground fault occurs with the neutral
grounding resistor open. The timedelay setting of the backup device
must not exceed 0.25 seconds.
(v) Thermal devices must detect a
sustained ground-fault current in the
neutral grounding resistor and must
de-energize the incoming power. The
device must operate at either 50 percent of the maximum temperature rise
of the neutral grounding resistor or 302
°F (150 °C), whichever is less. Thermal
protection must not be dependent on
control power and may consist of a current transformer and over-current
relay in the neutral grounding resistor
circuit.
(vi) A single window-type current
transformer that encircles all threephase conductors must be used to activate the ground-fault device protecting
the continuous mining machine. Equipment grounding conductors must not
pass through the current transformer.
(vii) A test circuit for the groundfault device must be provided. The test
circuit must inject no more than 50
percent of the current rating of the
neutral grounding resistor through the
current transformer. When the test circuit is activated, the circuit-interrupting device must open.
(3) Under-voltage protection. The
under-voltage device must operate on a
loss of voltage, de-energize the circuit,
and prevent the equipment from automatically restarting.
(b) Re-closing. Circuit-interrupting
devices must not re-close automatically.
(c) Onboard Power Circuits. When a
grounded-phase indicator light circuit
is used and it indicates a groundedphase fault, the following corrective
actions must be taken:
(1) The machine must be moved immediately to a location with a properly
supported roof; and
(2) The grounded-phase condition
must be located and corrected prior to
placing the continuous mining machine
back into operation.
[75 FR 17549, Apr. 6, 2010]
§ 75.825
Power centers.
(a) Main disconnecting switch. The
power center supplying high voltage
power to the continuous mining machine must be equipped with a main
disconnecting switch that, when in the
open position, de-energizes input to all
power transformers.
(b) Trailing cable disconnecting device.
In addition to the main disconnecting
switch required in paragraph (a) of this
section, the power center must be
equipped with a disconnecting device
for each circuit that supplies power to
a high-voltage continuous mining machine. A disconnecting device is defined as a disconnecting switch or a
cable coupler.
(c) Disconnecting switches. Each disconnecting switch must be labeled to
clearly identify the circuit it disconnects, and be designed and installed
as follows:
(1) Rated for the maximum phase-tophase voltage of the circuit;
(2) Rated for the full-load current of
the circuit that is supplied power
through the device.
590
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00600
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.827
(3) Allow for visual observation,
without removing any covers, to verify
that the contacts are open;
(4) Ground all power conductors on
the load side when the switch is in the
‘‘open and grounded’’ position;
(5) Can only be locked out in the
‘‘open and grounded’’ position; and
(6) Safely interrupts the full-load
current of the circuit or causes the current to be interrupted automatically
before the disconnecting switch opens.
(d) Barriers and covers. All compartments that provide access to high-voltage circuits must have barriers and/or
covers to prevent miners from contacting energized high-voltage circuits.
(e) Main disconnecting switch and control circuit interlocking. The control circuit must be interlocked with the main
disconnecting switch in the power center so that:
(1) When the main disconnecting
switch is in the ‘‘open’’ position, the
control circuit can only be powered
through an auxiliary switch in the
‘‘test’’ position; and
(2) When the main disconnecting
switch is in the ‘‘closed’’ position, the
control circuit can only be powered
through an auxiliary switch in the
‘‘normal’’ position.
(f) Interlocks. Each cover or removable barrier providing access to highvoltage circuits must be equipped with
at least two interlock switches. Except
when the auxiliary switch is on the
‘‘test’’ position, removal of any cover
or barrier that exposes energized highvoltage circuits must cause the interlock switches to automatically de-energize the incoming circuit to the
power center.
(g) Emergency stop switch. The power
center must be equipped with an externally accessible emergency stop switch
hard-wired into the incoming groundwire monitor circuit that de-energizes
the incoming high-voltage in the event
of an emergency.
(h) Grounding stick. The power center
must be equipped with a grounding
stick to be used prior to performing
electrical work to assure that highvoltage capacitors are discharged and
circuits are de-energized. The power
center must have a label readily identifying the location of the grounding
stick. The grounding stick must be
stored in a dry location.
(i) Caution label. All compartments
providing access to energized highvoltage conductors and parts must display a caution label to warn miners
against entering the compartments before de-energizing incoming high-voltage circuits.
[75 FR 17549, Apr. 6, 2010]
§ 75.826
High-voltage trailing cables.
High-voltage trailing cables must:
(a) Meet existing trailing cable requirements and the approval requirements of the high-voltage continuous
mining machine; and
(b) Meet existing ground-check conductor requirements (§ 75.804) or have a
stranded center ground-check conductor not smaller than a No. 16
A.W.G.
[75 FR 17549, Apr. 6, 2010]
§ 75.827
Guarding of trailing cables.
(a) Guarding. (1) The high-voltage
cable must be guarded in the following
locations:
(i) From the power center cable coupler for a distance of 10 feet inby the
power center;
(ii) From the entrance gland for a
distance of 10 feet outby the last strain
clamp on the continuous mining machine; and,
(iii) At any location where the cable
could be damaged by moving equipment.
(2) Guarding must be constructed
using nonconductive flame-resistant
material or grounded metal.
(b) Suspended cables and cable crossovers. When equipment must cross any
portion of the cable, the cable must be
either:
(1) Suspended from the mine roof; or
(2) Protected by a cable crossover
having the following specifications:
(i) A minimum length of 33 inches;
(ii) A minimum width of 17 inches;
(iii) A minimum height of 3 inches;
(iv) A minimum cable placement area
of two and one half-inches (21⁄2″) high
by four and one-quarter inches (41⁄4″)
wide;
(v) Made of nonconductive material;
591
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00601
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.828
30 CFR Ch. I (7–1–19 Edition)
(vi) Made of material with a distinctive color. The color black must not be
used; and
(vii) Made of material that has a
minimum compressive strength of 6,400
pounds per square inch (psi).
[75 FR 17549, Apr. 6, 2010]
§ 75.828 Trailing cable pulling.
The trailing cable must be de-energized prior to being pulled by any
equipment other than the continuous
mining machine. The cable manufacturer’s recommended pulling procedures must be followed when pulling
the trailing cable with equipment
other than the continuous mining machine.
[75 FR 17549, Apr. 6, 2010]
592
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00602
Fmt 8010
Sfmt 8006
Q:\30\30V1.TXT
PC31
ER06AP10.002
kpayne on VMOFRWIN702 with $$_JOB
§ 75.829 Tramming continuous mining
machines in and out of the mine
and from section to section.
(a) Conditions of use. Tramming the
continuous mining machine in and out
of the mine and from section to section
must be done in accordance with movement requirements of high-voltage
power centers and portable transformers (§ 75.812) and as follows:
(1) The power source must not be located in areas where permissible equipment is required;
(2) The continuous mining machine
must not be used for mining or cutting
purposes, unless a power center is used
in accordance with §§ 75.823 through
75.828 and §§ 75.830 through 75.833;
(3) Low-, medium-, and high-voltage
cables must comply with §§ 75.600–1,
75.907, and 75.826, as applicable; and
(4) The energized high-voltage cable
must be mechanically secured onboard
the continuous mining machine. This
provision applies only when using the
power sources specified in paragraphs
(c)(2) and (c)(3) of this section.
(b) Testing prior to tramming. Prior to
tramming the continuous mining machine,
(1) A qualified person must activate
the ground-fault and ground-wire monitor test circuits of the power sources
specified in paragraph (c) of this section to assure that the corresponding
circuit-interrupting device opens the
circuit. Corrective actions and recordkeeping resulting from these tests
must be in accordance with §§ 75.832(f)
and (g).
(2) Where applicable, a person designated by the mine operator must activate the test circuit for the grounded-phase detection circuit on the continuous mining machine to assure that
the detection circuit is functioning
properly. Corrective actions resulting
from this test must be in accordance
with § 75.832(f).
(c) Power sources. In addition to the
power center specified in § 75.825, the
following power sources may be used to
tram the continuous mining machine.
(1) Medium-voltage power source. A
medium-voltage power source is a
source that supplies 995 volts through a
trailing cable (See Figure 1 of this section) to the continuous mining machine. The medium-voltage power
source must—
(i) Not be used to back-feed the highvoltage circuits of the continuous mining machine; and
(ii) Meet all applicable requirements
for medium-voltage circuits in 30 CFR
75.
Mine Safety and Health Admin., Labor
§ 75.831
(2) Step-up transformer. A step-up
transformer is a transformer that steps
up the low or medium voltage to high
voltage (See Figure 2 in this section)
and must meet the following requirements:
(i) The trailing cable supplying low
or medium voltage to the step-up
transformer must meet the applicable
requirements of 30 CFR part 75;
(ii) The high-voltage circuit output
of the step-up transformer supplying
power to the continuous mining machine must meet the applicable provisions of § 75.824;
(iii) The step-up transformer enclosure must be—
(A) Securely mounted to minimize
vibration on:
(1) The continuous mining machine;
or
(2) A sled/cart that must be connected to the continuous mining machine by a tow-bar and be in close proximity to the mining machine.
(B) Grounded as follows:
(1) Connected to the incoming ground
conductor of the low- or medium-voltage trailing cable;
(2) Bonded by a No. 1/0 A.W.G. or
larger external grounding conductor to
the continuous mining machine frame;
and
(3) Bonded by a No. 1/0 A.W.G. or
larger external grounding conductor to
the metallic shell of each cable coupler.
(C) Equipped with:
(1) At least two interlock switches
for each of the enclosure covers; and
(2) An external emergency stop
switch to remove input power to the
step-up transformer.
[75 FR 17549, Apr. 6, 2010]
(iv) Using only MSHA-approved highvoltage kits that include instructions
for outer-jacket repairs and splices.
(b) Splicing limitations. (1) Splicing of
the high-voltage trailing cable within
35 feet of the continuous mining machine is prohibited.
(2) Only four (4) splices will be allowed at any one time for the portion
of the trailing cable that extends from
the continuous miner outby for a distance of 300 feet.
(a) Splices and repairs. (1) Splicing
means the mechanical joining of one or
more severed conductors in a single
length of a cable including the replacement of: Insulation, semi-conductive
tape, metallic shielding, and the outer
jacket(s).
(2) Repair means to fix damage to
any component of the cable other than
the conductor.
(3) Splices and repairs to high-voltage trailing cables must be made:
(i) Only by a qualified person trained
in the proper methods of splicing and
repairing high-voltage trailing cables;
(ii) In a workman-like manner;
(iii) In accordance with § 75.810; and
[75 FR 17549, Apr. 6, 2010]
§ 75.831 Electrical
work;
troubleshooting and testing.
(a) Trailing cable and continuous mining machine electrical work procedures.
Prior to performing electrical work,
other than troubleshooting and testing, on the high-voltage trailing cable
or the continuous mining machine, a
593
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00603
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
ER06AP10.003
kpayne on VMOFRWIN702 with $$_JOB
§ 75.830 Splicing and repair of trailing
cables.
§ 75.831
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
qualified person must de-energize the
power center and follow procedures
specified in paragraph (1) or (2):
(1) If a trailing cable disconnecting
switch is provided:
(i) Open and ground the power conductors, lock out and tag the disconnecting switch; and
(ii) Lock out and tag the plug to the
power receptacle.
(2) If a trailing cable disconnecting
switch is not provided and a cable coupler is used as a disconnecting device:
(i) Remove the plug from the power
receptacle and connect it to the
grounding receptacle;
(ii) Lock out and tag the plug to the
grounding receptacle; and
(iii) Place a dust cover over the
power receptacle.
(b) Troubleshooting and testing the
trailing cable. During troubleshooting
and testing, the de-energized high-voltage cable may be disconnected from
the power center only for that period of
time necessary to locate the defective
condition. Prior to troubleshooting and
testing trailing cables, a qualified person must perform the following:
(1) If a trailing cable disconnecting
switch is provided:
(i) Open and ground power conductors
and lock out and tag the disconnecting
switch;
(ii) Disconnect the plug from the
power receptacle;
(iii) Lock out and tag the plug; and
(iv) Place a dust cover over the power
receptacle.
(2) If a trailing cable disconnecting
switch is not provided and a cable coupler is used as a disconnecting device:
(i) Remove the plug from the power
receptacle and connect it to the
grounding receptacle to ground the
power conductors;
(ii) Remove the plug from the
grounding receptacle and install a lock
and tag on the plug; and
(iii) Place a dust cover over the
power receptacle.
(c) Troubleshooting and testing limitations. Troubleshooting and testing energized circuits must be performed
only:
(1) On low- and medium-voltage circuits;
(2) When the purpose of troubleshooting and testing is to determine
voltages and currents;
(3) By qualified persons; and
(4) When using protective gloves in
accordance with the following table:
Circuit voltage
Type of glove required
Greater than 120 volts (nominal) (not intrinsically safe) .............
40 volts to 120 volts (nominal) (both intrinsically safe and nonintrinsically safe).
Greater than 120 volts (nominal) (intrinsically safe) ...................
Rubber insulating gloves with leather protectors.
Either rubber insulating gloves with leather protectors or dry
work gloves.
Either rubber insulating gloves with leather protectors or dry
work gloves.
(d) Power center electrical work procedures. Before any work is performed inside any compartment of the power
center, except for troubleshooting and
testing energized circuits as specified
in paragraph (c) of this section, a qualified person must:
(1) De-energize affected circuits;
(2) Open the corresponding disconnecting switch, lock it out, and tag
it to assure the circuit is isolated;
(3) Visually verify that the contacts
of the disconnecting switch are open
and grounded; and
(4) Discharge all high-voltage capacitors and circuits.
(e) Locking out and tagging responsibilities. (1) When more than one qualified
person is performing electrical work,
including troubleshooting and testing,
each person must install an individual
lock and tag. Each lock and tag must
be removed only by the persons who installed them.
(2) If the person who installed the
lock and tag is unavailable, the lock
and tag may be removed by a person
authorized by the operator, provided
that:
(i) The authorized person is a qualified person; and
(ii) The mine operator assures that
the person who installed the lock and
tag is aware that the lock and tag have
been removed.
[75 FR 17549, Apr. 6, 2010]
594
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00604
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.833
§ 75.832 Frequency of examinations;
recordkeeping.
(a) Continuous mining machine examination. At least once every 7 days, a
qualified person must examine each
high-voltage continuous mining machine to verify that electrical protection, equipment grounding, permissibility, cable insulation, and control devices are properly installed and maintained.
(b) Ground-fault test circuit. At least
once every 7 days, and prior to
tramming the high-voltage continuous
mining machine, a qualified person
must activate the ground-fault test circuit to verify that it will cause the corresponding circuit-interrupting device
to open.
(c) Ground-wire monitor test. At least
once every 7 days, and prior to
tramming the high-voltage continuous
mining machine, a qualified person
must examine and test each high-voltage
continuous
mining
machine
ground-wire monitor circuit to verify
that it will cause the corresponding
circuit-interrupting device to open.
(d) Trailing cable inspections. (1) Once
each day during the shift that the continuous mining machine is first energized, a qualified person must de-energize and inspect the entire length of
the high-voltage trailing cable from
the power center to the continuous
mining machine. The inspection must
include examination of the outer jacket repairs and splices for damage, and
assure guarding is provided where required.
(2) At the beginning of each shift
that the continuous mining machine is
energized, a person designated by the
mine operator must de-energize and
visually inspect the high-voltage trailing cable for damage to the outer jacket. This inspection must be conducted
from the continuous mining machine
to the following locations:
(i) The last open crosscut;
(ii) Within 150 feet of the working
place during retreat or second mining;
or
(iii) Up to 150 feet from the continuous mining machine when the machine is used in outby areas.
(e) Grounded-phase detection test.
When a grounded-phase test circuit is
provided on a high-voltage continuous
mining machine, a person designated
by the mine operator must activate the
test circuit at the beginning of each
production shift to assure that the detection circuit is functioning properly.
(f) Corrective action. When examinations or tests of equipment reveal a
risk of fire, electrical shock, ignition,
or operational hazard, the equipment
must be immediately removed from
service or repaired.
(g) Record of tests. (1) At the completion of examinations and tests required
under paragraphs (a), (b), and (c) of this
section, the person conducting the examinations and tests must:
(i) Certify by signature and date that
the examinations and tests have been
conducted.
(ii) Make a record of any unsafe condition found.
(2) Any corrective action(s) must be
recorded by the person taking the corrective action.
(3) The record must be countersigned
by the mine foreman or equivalent
mine official by the end of the mine
foreman’s or the equivalent mine official’s next regularly scheduled working
shift.
(4) Records must be maintained in a
secure book that is not susceptible to
alteration or electronically in a computer system so as to be secure and not
susceptible to alteration.
(5) Certifications and records must be
kept for at least 1 year and must be
made available for inspection by authorized representatives of the Secretary and representatives of miners.
[75 FR 17549, Apr. 6, 2010]
§ 75.833 Handling high-voltage trailing
cables.
(a) Cable handling. (1) Miners must
not handle energized trailing cables unless they are wearing high-voltage insulating gloves, which include the rubber gloves and leather outer protector
gloves, or are using insulated cable
handling tools that meet the requirements of paragraph (c) or (d) of this
section.
(2) Miners must not handle energized
high-voltage cables with any parts of
their bodies except by hand in accordance with paragraph (1) above.
(b) Availability. Each mine operator
must make high-voltage insulating
595
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00605
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.834
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
gloves or insulated cable handling tools
available to miners handling energized
high-voltage trailing cables.
(c) High-voltage insulating gloves.
High-voltage insulating gloves must
meet the following requirements:
(1) The rubber gloves must be designed and maintained to have a voltage rating of at least Class 1 (7,500
volts) and tested every 30 days in accordance with publication ASTM F496–
02a, ‘‘Standard Specification for InService Care of Insulating Gloves and
Sleeves’’ (2002). The Director of the
Federal Register approved this incorporation by reference in accordance with
5 U.S.C. 522(a) and 1 CFR part 51. ASTM
F496–02a may be obtained from the
American Society for Testing and Materials, 100 Barr Harbor Drive, P.O. Box
C700, West Conshohocken, PA 19428–
2959, call 610–832–9500 or go to http://
www.astm.org. ASTM F496–02a is available for inspection at any MSHA Coal
Mine Safety and Health District Office,
at the MSHA Office of Standards, Regulations, and Variances, 201 12th Street
South, Arlington, VA 22202–5452; 202–
693–9440; or at the National Archives
and Records Administration (NARA).
For information on the availability of
this material at NARA, call 202–741–
6030, or go to: http://www.archives.gov/
federallregister/
codeloflfederallregulations/
ibrllocations.html.
(2) The rubber glove portion must be
air-tested at the beginning of each
shift to assure its effectiveness.
(3) Both the leather protector and
rubber insulating gloves must be vis-
ually examined before each use for
signs of damage or defects.
(4) Damaged rubber gloves must be
removed from the underground area of
the mine or destroyed. Leather protectors must be maintained in good condition or replaced.
(d) Insulated cable handling tools. Insulated cable handling tools must be:
(1) Rated and properly maintained to
withstand at least 7,500 volts;
(2) Designed and manufactured for
cable handling;
(3) Visually examined before each use
for signs of damage or defects; and
(4) Removed from the underground
area of the mine or destroyed if damaged or defective.
[75 FR 17549, Apr. 6, 2010, as amended at 80
FR 52992, Sept. 2, 2015]
§ 75.834
Training.
In addition to existing part 48 task
training, hazard training, training for
qualified persons under existing § 75.153,
and annual refresher training, the following specialized training shall be
provided and specified in the part 48
plan:
(a) Training for miners who perform
maintenance on high-voltage continuous mining machines in high-voltage
safety, testing, and repair and maintenance procedures.
(b) Training for personnel who work
in the vicinity of high-voltage continuous mining machines in safety procedures and precautions for moving the
high-voltage machines or the trailing
cables.
[75 FR 17549, Apr. 6, 2010]
596
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00606
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
Pt. 75, Subpt. I, App. A
APPENDIX A TO SUBPART I OF PART 75—DIAGRAMS OF INBY AND OUTBY SWITCHING
597
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00607
Fmt 8010
Sfmt 8026
Q:\30\30V1.TXT
PC31
ER17AP02.030
kpayne on VMOFRWIN702 with $$_JOB
[67 FR 11001, Mar. 11, 2002; 67 FR 18823, Apr. 17, 2002]
§ 75.900
30 CFR Ch. I (7–1–19 Edition)
Subpart J—Underground Low- and
Medium-Voltage Alternating
Current Circuits
§ 75.900 Low- and medium-voltage circuits serving three-phase alternating current equipment; circuit
breakers.
[STATUTORY PROVISIONS]
Low- and medium-voltage power circuits serving three-phase alternating
current equipment shall be protected
by suitable circuit breakers of adequate interrupting capacity which are
properly tested and maintained as prescribed by the Secretary. Such breakers shall be equipped with devices to
provide protection against undervoltage, grounded phase, short circuit, and
overcurrent.
§ 75.900–1
Circuit breakers; location.
Circuit breakers used to protect lowand medium-voltage circuits underground shall be located in areas which
are accessible for inspection, examination, and testing, have safe roofs, and
are clear of any moving equipment
used in haulageways.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.900–2
Approved circuit schemes.
The following circuit schemes will be
regarded as providing the necessary
protection to the circuit required by
§ 75.900:
(a) Ground check relays may be used
for undervoltage protection if the relay
coils are designed to trip the circuit
breaker when line voltage decreases to
40 to 60 percent of the nominal line
voltage.
(b) One undervoltage device installed
in the main secondary circuit at the
source transformer may be used to provide undervoltage protection for each
circuit that receives power from that
transformer.
(c) One circuit breaker may be used
to protect two or more branch circuits
if the circuit breaker is adjusted to afford overcurrent protection for the
smallest conductor.
(d) Circuit breakers with shunt trip,
series trip or undervoltage release devices may be used if the tripping elements of such devices are selected or
adjusted in accordance with the set-
tings listed in the tables of the National Electric Code, 1968.
§ 75.900–3 Testing, examination, and
maintenance of circuit breakers;
procedures.
Circuit breakers protecting low- and
medium-voltage alternating current
circuits serving three-phase alternating current equipment and their
auxiliary devices shall be tested and
examined at least once each month by
a person qualified as provided in
§ 75.153. In performing such tests, actuating any of the circuit breaker auxiliaries or control circuits in any manner which causes the circuit breaker to
open, shall be considered a proper test.
All components of the circuit breaker
and its auxiliary devices shall be visually examined and such repairs or adjustments as are indicated by such
tests and examinations shall be carried
out immediately.
§ 75.900–4 Testing, examination, and
maintenance of circuit breakers;
record.
The operator of any coal mine shall
maintain a written record of each test,
examination, repair, or adjustment of
all circuit breakers protecting low- and
medium-voltage circuits serving threephase alternating current equipment
used in the mine. Such record shall be
kept in a book approved by the Secretary.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.901 Protection of low- and medium-voltage three-phase circuits
used underground.
[STATUTORY PROVISIONS]
(a) Low- and medium-voltage threephase alternating-current circuits used
underground shall contain either a direct or derived neutral which shall be
grounded through a suitable resistor at
the power center, and a grounding circuit, originating at the grounded side
of the grounding resistor, shall extend
along with the power conductors and
serve as a grounding conductor for the
frames of all the electrical equipment
supplied power from that circuit, except that the Secretary or his authorized
representative
may
permit
598
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00608
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.901
ungrounded low- and medium-voltage
circuits to be used underground to feed
such stationary electrical equipment if
such circuits are either steel armored
or installed in grounded rigid steel conduit throughout their entire length.
The grounding resistor, where required,
shall be of the proper ohmic value to
limit the ground fault current to 25
amperes. The grounding resistor shall
be rated for maximum fault current
continuously
and
insulated
from
ground for a voltage equal to the
phase-to-phase voltage of the system.
(b) Diesel-powered electrical generators used as an alternative to power
centers for the purpose of moving
equipment in, out, and around the
mine, and to perform work in areas
where permissible equipment is not required, must comply with the following:
(1) The diesel engine powering the
electrical generator must be approved
under 30 CFR part 7, subpart E.
(2) A grounding resistor rated for the
phase-to-phase voltage of the system
must be provided to limit the groundfault current to not more than 0.5 amperes. The grounding resistor(s) must
be located:
(i) Between the wye-connected generator neutral and the generator frame;
(see Figure I in Appendix A to subpart
J of this part) or
(ii) Between the wye-connected generator neutral and the generator frame
and between the wye-connected transformer secondary and the transformer
frame when an isolation transformer(s)
is used and the generator is supplying
power to the other equipment; (see Figure II in Appendix A to subpart J of
this part) or
(iii) Between the wye-connected generator neutral and the generator frame
when an auto-transformer is used. (see
Figure III in Appendix A to subpart J
of this part)
(3) Each three-phase output circuit of
the generator must be equipped with a
sensitive ground fault relay. The protective relay must be set to cause the
circuit interrupting device that supplies power to the primary windings of
each transformer to trip and shut down
the diesel engine when a phase-toframe fault of not more than 90
milliamperes occurs.
(4) Each three-phase output circuit
that supplies power to equipment must
be equipped with an instantaneous sensitive ground-fault relay that will
cause its respective circuit interrupting device(s) to trip and cause
shutdown of the diesel engine when a
phase-to-frame
fault
occurs.
The
grounded-phase protection must be set
at not more than 90 milliamps. Current
transformers used for the ground-fault
protection must be single window-type
and must be installed to encircle all
three phase conductors. Equipment
safety grounding conductors must not
pass through or be connected in series
with
ground-fault
current
transformers.
(5) Each three-phase circuit interrupting device must be provided with a
means to provide short-circuit, overcurrent, grounded-phase, undervoltage,
and ground wire monitoring protection. The instantaneous only trip unit
for the circuit interrupting device(s) in
use must be adjusted to trip at not
more than 75 percent of the minimum
available short circuit current at the
point where the portable cable enters
the equipment or the maximum allowable instantaneous settings specified in
§ 75.601–1, whichever is less.
(6) The equipment portable cable
length(s) must not exceed the length(s)
specified in 30 CFR part 18, appendix I,
table 9, Specifications for Cables
Longer than 500 Feet.
(7) Permanent label(s) listing the
maximum circuit interrupting device
setting(s) and maximum portable cable
length(s) must be installed on each instantaneous trip unit or be maintained
near each three-phase circuit interrupting device. The permanent label(s)
must be maintained legibly.
(8) The circuit interrupting device
that supplies three-phase power circuit(s) to the equipment being powered
must be limited to the use of only one
circuit interrupting device at a time
when equipment is being moved in, out,
and around the mine.
(9) The grounding system must include an MSHA-accepted ground wire
monitor system that satisfies the requirements of § 75.902; or have a No. 1/0
or larger external grounding conductor
to bond and ground the frames of all
599
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00609
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.902
30 CFR Ch. I (7–1–19 Edition)
equipment to the frame of the generator.
(10) All trailing cables extending
from the generator to equipment must
comply with § 75.907.
(11) A strain relief device must be
provided on each end of the trailing cables that extends between the generator and the piece of equipment being
powered.
(12) Prior to moving each piece of
equipment or performing work, a functional test of each ground fault and
ground wire monitor system must be
performed by a qualified electrician
who meets the requirements of § 75.153.
The ground-fault circuit must be tested
without subjecting the circuit to an actual grounded phase condition. A
record of each test must be maintained
and made available to authorized representatives of the Secretary and to
the miners in such mine.
[35 FR 17890, Nov. 20, 1970, as amended at 70
FR 77736, Dec. 30, 2005]
§ 75.902 Lowand
medium-voltage
ground check monitor circuits.
[STATUTORY PROVISIONS]
On or before September 30, 1970, lowand medium-voltage resistance grounded systems shall include a fail-safe
ground check circuit to monitor continuously the grounding circuit to assure continuity which ground check
circuit shall cause the circuit breaker
to open when either the ground or pilot
check wire is broken, or other no less
effective device approved by the Secretary or his authorized representative
to assure such continuity, except that
an extention of time, not in excess of 12
months, may be permitted by the Secretary on a mine-by-mine basis if he
determines that such equipment is not
available. Cable couplers shall be constructed so that the ground check continuity conductor shall be broken first
and the ground conductors shall be broken last when the coupler is being uncoupled.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.902–1 Maximum
check circuits.
voltage
ground
The maximum voltage used for such
ground check circuits shall not exceed
40 volts.
§ 75.902–2 Approved ground check systems not employing pilot check
wires.
Ground check systems not employing
pilot check wires will be approved only
if it is determined that the system includes a fail safe design causing the
circuit breaker to open when ground
continuity is broken.
§ 75.902–4 Attachment of ground conductors and ground check wires to
equipment frames; use of separate
connections.
In grounding equipment frames of all
stationary, portable or mobile equipment receiving power from resistance
grounded systems separate connections
shall be used when practicable.
§ 75.903
Disconnecting devices.
[STATUTORY PROVISIONS]
Disconnecting devices shall be installed in conjunction with the circuit
breaker to provide visual evidence that
the power is disconnected.
§ 75.904 Identification of circuit breakers.
[STATUTORY PROVISIONS]
Circuit breakers shall be marked for
identification.
§ 75.905 Connection
loads.
of
[STATUTORY PROVISIONS]
Single-phase loads shall be connected
phase-to-phase.
§ 75.906 Trailing cables for mobile
equipment, ground wires, and
ground check wires.
[STATUTORY PROVISIONS]
Trailing cables for mobile equipment
shall contain one or more ground conductors having a cross-sectional area of
not less than one-half the power conductor, and, on September 30, 1970, an
insulated conductor for the ground
continuity check circuit or other no
less effective device approved by the
Secretary or his authorized representative to assure such continuity, except
that an extension of time, not in excess
of 12 months may be permitted by the
600
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00610
Fmt 8010
single-phase
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.907
Secretary on a mine-by-mine basis if
he determines that such equipment is
not available. Splices made in the cables shall provide continuity of all
components.
ductors, a ground check conductor, and
grounded metallic shields around each
power conductor or a ground metallic
shield over the assembly, except that
on equipment employing cable reels,
cables without shields may be used if
the insulation is rated 2,000 volts or
more.
§ 75.907 Design of trailing cables for
medium-voltage circuits.
[STATUTORY PROVISIONS]
kpayne on VMOFRWIN702 with $$_JOB
Trailing cables for medium-voltage
circuits shall include grounding con-
601
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00611
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Pt. 75, Subpt. J, App. A
30 CFR Ch. I (7–1–19 Edition)
602
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00612
Fmt 8010
Sfmt 8006
Q:\30\30V1.TXT
PC31
ER30DE05.146
kpayne on VMOFRWIN702 with $$_JOB
APPENDIX A TO SUBPART J OF PART 75
Pt. 75, Subpt. J, App. A
603
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00613
Fmt 8010
Sfmt 8006
Q:\30\30V1.TXT
PC31
ER30DE05.147
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1000
30 CFR Ch. I (7–1–19 Edition)
[70 FR 77737, Dec. 30, 2005]
§ 75.1001–1 Devices for overcurrent
protection; testing and calibration
requirements; records.
fected circuit upon occurrence of a
short circuit at any point in the system will meet the requirements of
§ 75.1001.
(b) Automatic circuit interrupting
devices described in paragraph (a) of
this section shall be tested and calibrated at intervals not to exceed six
months. Testing of such devices shall
include passing the necessary amount
of electric current through the device
to cause activation. Calibration of such
devices shall include adjustment of all
associated relays to ±15 percent of the
indicated value. An authorized representative of the Secretary may require additional testing or calibration
of these devices.
(c) A record of the tests and calibrations required by paragraph (b) of this
section shall be kept, and shall be
made available, upon request, to an authorized representative of the Secretary.
(a) Automatic circuit interrupting
devices that will deenergize the af-
[38 FR 29998, Oct. 31, 1973, as amended at 60
FR 33723, June 29, 1995]
Subpart K—Trolley Wires and
Trolley Feeder Wires
§ 75.1000
Cutout switches.
[STATUTORY PROVISIONS]
Trolley wires and trolley feeder
wires, shall be provided with cutout
switches at intervals of not more than
2,000 feet and near the beginning of all
branch lines.
§ 75.1001
Overcurrent protection.
[STATUTORY PROVISIONS]
604
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00614
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
ER30DE05.148
kpayne on VMOFRWIN702 with $$_JOB
Trolley wires and trolley feeder wires
shall be provided with overcurrent protection.
Mine Safety and Health Admin., Labor
§ 75.1003–2
§ 75.1002 Installation of electric equipment and conductors; permissibility.
(a) Electric equipment must be permissible and maintained in a permissible condition when such equipment is
located within 150 feet of pillar workings or longwall faces.
(b) Electric conductors and cables installed in or in by the last open crosscut or within 150 feet of pillar workings
or longwall faces must be—
(1) Shielded high-voltage cables supplying power to permissible longwall
equipment;
(2) Interconnecting conductors and
cables of permissible longwall equipment;
(3) Conductors and cables of intrinsically safe circuits; and
(4) Cables and conductors supplying
power to low- and medium-voltage permissible equipment.
(5) Shielded high-voltage cables supplying power to permissible continuous
mining machines.
§ 75.1003–1 Other requirements for
guarding of trolley wires and trolley feeder wires.
Adequate precaution shall be taken
to insure that equipment being moved
along haulageways will not come in
contact with trolley wires or trolley
feeder wires.
[67 FR 11004, Mar. 11, 2002, as amended at 75
FR 17553, Apr. 6, 2010]
§ 75.1003 Insulation of trolley wires,
trolley feeder wires and bare signal
wires; guarding of trolley wires and
trolley feeder wires.
kpayne on VMOFRWIN702 with $$_JOB
[STATUTORY PROVISIONS]
Trolley wires, trolley feeder wires,
and bare signal wires shall be insulated
adequately where they pass through
doors and stoppings, and where they
cross other power wires and cables.
Trolley wires and trolley feeder wires
shall be guarded adequately:
(a) At all points where men are required to work or pass regularly under
the wires;
(b) On both sides of all doors and
stoppings; and
(c) At man-trip stations.
The Secretary or his authorized representatives shall specify other conditions where trolley wires and trolley
feeder wires shall be adequately protected to prevent contact by any person, or shall require the use of improved methods to prevent such contact. Temporary guards shall be provided where trackmen and other persons work in proximity to trolley wires
and trolley feeder wires.
§ 75.1003–2 Requirements for movement of off-track mining equipment
in areas of active workings where
energized trolley wires or trolley
feeder wires are present; pre-movement requirements; certified and
qualified persons.
(a) Prior to moving or transporting
any unit of off-track mining equipment
in areas of the active workings where
energized trolley wires or trolley feeder wires are present:
(1) The unit of equipment shall be examined by a certified person to ensure
that coal dust, float coal dust, loose
coal oil, grease, and other combustible
materials have been cleaned up and
have not been permitted to accumulate
on such unit of equipment; and,
(2) A qualified person, as specified in
§ 75.153 of this part, shall examine the
trolley wires, trolley feeder wires, and
the associated automatic circuit interrupting devices provided for short circuit protection to ensure that proper
short circuit protection exists.
(b) A record shall be kept of the examinations required by paragraph (a)
of this section, and shall be made available, upon request, to an authorized
representative of the Secretary.
(c) Off-track mining equipment shall
be moved or transported in areas of the
active workings where energized trolley wires or trolley feeder wires are
present only under the direct supervision of a certified person who shall be
physically present at all times during
moving or transporting operations.
(d) The frames of off-track mining
equipment being moved or transported,
in accordance with this section, shall
be covered on the top and on the trolley wire side with fire-resistant material which has met the applicable requirements of Part 18 of Subchapter D
of this chapter (Bureau of Mines Schedule 2G).
(e) Electrical contact shall be maintained between the mine track and the
frames of off-track mining equipment
605
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00615
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1100
30 CFR Ch. I (7–1–19 Edition)
being moved in-track and trolley entries, except that rubber-tired equipment need not be grounded to a transporting vehicle if no metal part of such
rubber-tired equipment can come into
contact with the transporting vehicle.
(f) A minimum vertical clearance of
12 inches shall be maintained between
the farthest projection of the unit of
equipment which is being moved and
the energized trolley wires or trolley
feeder wires at all times during the
movement or transportation of such
equipment; provided, however, that if
the height of the coal seam does not
permit 12 inches of vertical clearance
to be so maintained, the following additional precautions shall be taken:
(1)(i) Except as provided in paragraph
(f)(1)(ii) of this section electric power
shall be supplied to the trolley wires or
trolley feeder wires only from outby
the unit of equipment being moved or
transported.
(ii) Where direct current electric
power is used and such electric power
can be supplied only from inby the
equipment being moved or transported,
power may be supplied from inby such
equipment provided a miner with the
means to cut off the power, and in direct communication with persons actually engaged in the moving or transporting operation, is stationed outby
the equipment being moved.
(2) The settings of automatic circuit
interrupting devices used to provide
short circuit protection for the trolley
circuit shall be reduced to not more
than one-half of the maximum current
that could flow if the equipment being
moved or transported were to come
into contact with the trolley wire or
trolley feeder wire;
(3) At all times the unit of equipment
is being moved or transported, a miner
shall be stationed at the first automatic circuit breaker outby the equipment being moved and such miner shall
be: (i) In direct communication with
persons actually engaged in the moving
or transporting operation, and (ii) capable of communicating with the responsible person on the surface required to be on duty in accordance
with § 75.1600–1 of this part;
(4) Where trolley phones are utilized
to satisfy the requirements of paragraph (f)(3) of this section, telephones
or other equivalent two-way communication devices that can readily be
connected with the mine communication system shall be carried by the
miner stationed at the first automatic
circuit breaker outby the equipment
being moved and by a miner actually
engaged in the moving or transporting
operation; and,
(5) No person shall be permitted to be
inby the unit of equipment being
moved or transported, in the ventilating current of air that is passing
over such equipment, except those persons directly engaged in moving such
equipment.
(g) The provisions of paragraphs (a)
through (f) of this section shall not
apply to units of mining equipment
that are transported in mine cars, provided that no part of the equipment extends above or over the sides of the
mine car.
[38 FR 29998, Oct. 31, 1973, as amended at 60
FR 33723, June 29, 1995]
Subpart L—Fire Protection
§ 75.1100
Requirements.
[STATUTORY PROVISION]
Each coal mine shall be provided
with suitable firefighting equipment
adapted for the size and conditions of
the mine. The Secretary shall establish
minimum requirements of the type,
quality, and quantity of such equipment.
§ 75.1100–1 Type and quality of firefighting equipment.
Firefighting
equipment
required
under this subpart shall meet the following minimum requirements:
(a) Waterlines: Waterlines shall be
capable of delivering 50 gallons of
water a minute at a nozzle pressure of
50 pounds per square inch.
(b) Portable water cars: A portable
water car shall be of at least 1,000 gallons capacity (500 gallons capacity for
anthracite mines) and shall have at
least 300 feet of fire hose with nozzles.
A portable water car shall be capable of
providing a flow through the hose of 50
gallons of water per minute at a nozzle
pressure of 50 pounds per square inch.
(c) A portable chemical car shall
carry enough chemicals to provide a
606
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00616
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1100–2
fire extinguishing capacity equivalent
to that of a portable water car.
(d) Portable foam-generating machines or devices: A portable foam-generating machine or device shall have
facilities and equipment for supplying
the machine with 30 gallons of water
per minute at 30 pounds per square
inch for a period of 35 minutes.
(e) Portable fire extinguisher: A portable fire extinguisher shall be either (1)
a multipurpose dry chemical type containing a nominal weight of 5 pounds of
dry powder and enough expellant to
apply the powder or (2) a foam-producing type containing at least 21⁄2 gallons of foam-producing liquids and
enough expellant to supply the foam.
Only fire extinguishers approved by the
Underwriters Laboratories, Inc., or
Factory Mutual Research Corp., carrying appropriate labels as to type and
purpose, shall be used. After March 30,
1971, all new portable fire extinguishers
acquired for use in a coal mine shall
have a 2A 10 BC or higher rating.
(f)(1) Except as provided in paragraph
(f)(2) of this section, the fire hose shall
be lined with a material having flame
resistant qualities meeting requirements for hose in Bureau of Mines’
Schedule 2G. The cover shall be polyester, or other material with flamespread qualities and mildew resistance
equal or superior to polyester. The
bursting pressure shall be at least 4
times the water pressure at the valve
to the hose inlet with the valve closed;
the maximum water pressure in the
hose nozzle shall not exceed 100 p.s.i.g.
(2) Fire hose installed for use in underground coal mines prior to December 30, 1970, shall be mildew-proof and
have a bursting pressure at least 4
times the water pressure at the valve
to the hose inlet with the valve closed,
and the maximum water pressure in
the hose nozzle with water flowing
shall not exceed 100 p.s.i.g.
point and be equipped with enough fire
hose to reach each working face unless
the section loading point is provided
with one of the following:
(i) Two portable water cars; or
(ii) Two portable chemical cars; or
(iii) One portable water car or one
portable chemical car, and either (a) a
portable foam-generating machine or
(b) a portable high-pressure rock-dusting machine fitted with at least 250
feet of hose and supplied with at least
60 sacks of rock dust.
(2) Each working section of coal
mines producing less than 300 tons of
coal per shift shall be provided with
the following:
(i) Two portable fire extinguishers;
and
(ii) 240 pounds of rock dust in bags or
other suitable containers; and
(iii) At least 500 gallons of water and
at least three pails of 10-quart capacity; or a waterline with sufficient hose
to reach the working places; or a portable water car of at least 500-gallons
capacity; or a portable, all-purpose,
dry-powder chemical car of at least 125pounds capacity.
(3) As an alternative to paragraph
(a)(2) of this section, each working section with no electrical equipment at
the face of an anthracite coal mine producing less than 300 tons of coal per
shift shall be provided with the following:
(i) Portable fire extinguishers containing a total capacity of at least 30
pounds of dry chemical or 15 gallons of
foam and located at the entrance to
the gangway at the bottom of the
slope; and
(ii) Portable fire extinguishers containing a total capacity of at least 20
pounds of dry chemical or 10 gallons of
foam and located within 500 feet from
the working face.
(b) Belt conveyors. In all coal mines,
waterlines shall be installed parallel to
the entire length of belt conveyors and
shall be equipped with firehose outlets
with valves at 300-foot intervals along
each belt conveyor and at tailpieces.
At least 500 feet of firehose with fittings suitable for connection with each
belt conveyor waterline system shall
be stored at strategic locations along
the belt conveyor. Waterlines may be
§ 75.1100–2 Quantity and location of
firefighting equipment.
(a) Working sections. (1) Each working
section of coal mines producing 300
tons or more per shift shall be provided
with two portable fire extinguishers
and 240 pounds of rock dust in bags or
other suitable containers; waterlines
shall extend to each section loading
607
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00617
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1100–3
30 CFR Ch. I (7–1–19 Edition)
installed in entries adjacent to the conveyor entry belt as long as the outlets
project into the belt conveyor entry.
(c) Haulage tracks. (1) In mines producing 300 tons of coal or more per
shift waterlines shall be installed parallel to all haulage tracks using
mechanized equipment in the track or
adjacent entry and shall extend to the
loading point of each working section.
Waterlines shall be equipped with outlet valves at intervals of not more than
500 feet, and 500 feet of firehose with
fittings suitable for connection with
such waterlines shall be provided at
strategic locations. Two portable water
cars, readily available, may be used in
lieu of waterlines prescribed under this
paragraph.
(2) In mines producing less than 300
tons of coal per shift, there shall be
provided at 500-foot intervals in all
main and secondary haulage roads:
(i) A tank of water of at least 55-gallon capacity with at least 3 pails of not
less than 10-quart capacity; or
(ii) Not less than 240 pounds of
bagged rock dust.
(d) Transportation. Each track or offtrack locomotive, self-propelled mantrip car, or personnel carrier shall be
equipped with one portable fire extinguisher.
(e) Electrical installations. At each
electrical installation, the operator
shall provide two portable fire extinguishers that have a nominal capacity
of 5 pounds of dry chemical, or one extinguisher that has a nominal capacity
of at least 10 pounds of dry chemical,
and which have a 2–A:10–B:C or higher
rating.
(f) Oil storage stations. Two portable
fire extinguishers and 240 pounds of
rock dust, shall be provided at each
permanent underground oil storage
station. One portable fire extinguisher
shall be provided at each working section where 25 gallons or more of oil are
stored in addition to extinguishers required under paragraph (a) of this section.
(g) Welding, cutting, soldering. One
portable fire extinguisher or 240 pounds
of rock dust shall be provided at locations where welding, cutting, or soldering with arc or flame is being done.
(h) Powerlines. At each wooden door
through which powerlines pass there
shall be one portable fire extinguisher
or 240 pounds of rock dust within 25
feet of the door on the intake air side.
(i) Emergency materials. (1) At each
mine producing 300 tons of coal or more
per shift there shall be readily available the following materials at locations not exceeding 2 miles from each
working section:
1,000 board feet of brattice boards
2 rolls of brattice cloth
2 hand saws
25 pounds of 8d nails
25 pounds of 10d nails
25 pounds of 16d nails
3 claw hammers
25 bags of wood fiber plaster or 10 bags of cement
(or
equivalent
material
for
stoppings)
5 tons of rock dust
(2) At each mine producing less than
300 tons of coal per shift the above materials shall be available at the mine,
provided, however, that the emergency
materials for one or more mines may
be stored at a central warehouse or
building supply company and such supply must be the equivalent of that required for all mines involved and within 1-hour’s delivery time from each
mine. This exception shall not apply
where the active working sections are
more than 2 miles from the surface.
[35 FR 17890, Nov. 20, 1970, as amended at 73
FR 53127, Sept. 15, 2008]
§ 75.1100–3 Condition and examination
of firefighting equipment.
All firefighting equipment shall be
maintained in a usable and operative
condition.
Chemical
extinguishers
shall be examined every 6 months and
the date of the examination shall be
written on a permanent tag attached
to the extinguisher.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1101 Deluge-type water sprays,
foam generators; main and secondary belt-conveyor drives.
[STATUTORY PROVISIONS]
Deluge-type water sprays or foam
generators automatically actuated by
608
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00618
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1101–7
rise in temperature, or other no less effective means approved by the Secretary of controlling fire, shall be installed at main and secondary belt-conveyor drives.
§ 75.1101–5 Installation of foam generator systems.
(a) Foam generator systems shall be
located so as to discharge foam to the
belt drive, belt takeup, electrical controls, gear reducing unit and the conveyor belt.
(b) Foam generator systems shall be
equipped with a fire sensor which actuates the system, and each system shall
be capable of producing and delivering
the following amounts of foam within 5
minutes:
(1) At fire-resistant belt installations, an amount which will fully envelop the belt drive, belt takeup, electrical controls, gear reducing unit, and
the conveyor belt over a distance of 50
feet; and,
(2) At nonfire-resistant belt installations, an amount which will fully envelop the belt drive, belt takeup electrical controls, gear reducing unit, and
the conveyor belt over a distance of 150
feet.
(c) The foam generator shall be
equipped with a warning device designed to stop the belt drive when a
fire occurs and all such warning devices shall be capable of giving both an
audible and visual signal when actuated by fire.
(d) Water, power, and chemicals required shall be adequate to maintain
water or foam flow for no less than 25
minutes.
(e) Water systems shall include
strainers with a flush-out connection
and a manual shut-off valve.
§ 75.1101–1 Deluge-type water spray
systems.
(a) Deluge-type spray systems shall
consist of open nozzles attached to
branch lines. The branch lines shall be
connected to a waterline through a
control valve operated by a fire sensor.
Actuation of the control valve shall
cause water to flow into the branch
lines and discharge from the nozzles.
(b) Nozzles attached to the branch
lines shall be full cone, corrosion resistant and provided with blow-off dust
covers. The spray application rate shall
not be less than 0.25 gallon per minute
per square foot of the top surface of the
top belt and the discharge shall be directed at both the upper and bottom
surfaces of the top belt and to the
upper surface of the bottom belt.
§ 75.1101–2 Installation of deluge-type
sprays.
Deluge-type water spray systems
shall provide protection for the belt
drive and 50 feet of fire-resistant belt
or 150 feet of nonfire-resistant belt adjacent to the belt drive.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1101–3 Water requirements.
Deluge-type water spray systems
shall be attached to a water supply.
Water so supplied shall be free of excessive sediment and noncorrosive to the
system Water pressure shall be maintained consistent with the pipe, fittings, valves, and nozzles at all times.
Water systems shall include strainers
with a flush-out connection and a manual shut-off valve. The water supply
shall be adequate to provide flow for 10
minutes except that pressure tanks
used as a source of water supply shall
be of 1,000-gallon capacity for a fire-resistant belt and 3,000 gallons for a
nonfire-resistant belt may be provided.
§ 75.1101–4 Branch lines.
As a part of the deluge-type water
spray system, two or more branch lines
of nozzles shall be installed. The maximum distance between nozzles shall
not exceed 8 feet.
§ 75.1101–6 Water sprinkler systems;
general.
Water sprinkler systems may be installed to protect main and secondary
belt-conveyor drives, however, where
such systems are employed, they shall
be installed and maintained in accordance with §§ 75.1101–7 through 75.1101–11.
§ 75.1101–7 Installation of water sprinkler systems; requirements.
(a) The fire-control components of
each water sprinkler system shall be
installed, as far as practicable in accordance with the recommendations
set forth in National Fire Protection
Association 1968–69 edition, Code No.
13, ‘‘Installation of Sprinkler Systems’’
and such systems’ components shall be
609
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00619
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.1101–8
30 CFR Ch. I (7–1–19 Edition)
of a type approved by the Underwriters’ Laboratories, Inc., Factory
Mutual Research Corp.
(b) Each sprinkler system shall provide protection for the motor drive belt
takeup, electrical controls, gear reducing unit, and the 50 feet of fire-resistant belt, or 150 feet of nonfire-resistant
belt adjacent to the belt drive.
(c) The components of each water
sprinkler system shall be located so as
to minimize the possibility of damage
by roof fall or by the moving belt and
its load.
§ 75.1101–8 Water sprinkler systems;
arrangement of sprinklers.
(a) At least one sprinkler shall be installed above each belt drive, belt takeup, electrical control, and gear-reducing unit, and individual sprinklers
shall be installed at intervals of no
more than 8 feet along all conveyor
branch lines.
(b) Two or more branch lines, at least
one of which shall be above the top belt
and one between the top and bottom
belt, shall be installed in each sprinkler system to provide a uniform discharge of water to the belt surface.
(c) The water discharge rate from the
sprinkler system shall not be less than
0.25 gallon per minute per square foot
of the top surface of the top belt and
the discharge shall be directed at both
the upper and bottom surfaces of the
top belt and to the upper surface of the
bottom belt. The supply of water shall
be adequate to provide a constant flow
of water for 10 minutes with all sprinklers functioning.
(d) Each individual sprinkler shall be
activated at a temperature of not less
than 150 °F. and not more than 300 °F.
(e) Water systems shall include
strainers with a flush-out connection
and a manual shut-off valve.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1101–9 Back-up water system.
One fire hose outlet together with a
length of hose capable of extending to
the belt drive shall be provided within
300 feet of each belt drive.
§ 75.1101–10 Water sprinkler systems;
fire warning devices at belt drives.
Each water sprinkler system shall be
equipped with a device designed to stop
the belt drive in the event of a rise in
temperature and each such warning device shall be capable of giving both an
audible and visual warning when a fire
occurs.
§ 75.1101–11 Inspection of water sprinkler systems.
Each water sprinkler system shall be
examined weekly and a functional test
of the complete system shall be conducted at least once each year.
§ 75.1101–12 Equivalent dry-pipe system.
Where water sprinkler systems are
installed to protect main and secondary belt conveyor drives and freezing temperatures prevail, an equivalent
dry-pipe system may be installed.
§ 75.1101–13 Dry powder chemical systems; general.
Self-contained dry powder chemical
systems may be installed to protect
main and secondary belt conveyor
drives, however, where such systems
are employed, they shall be installed
and maintained in accordance with the
provisions of §§ 75.1101–14 through
75.1101–22.
§ 75.1101–14 Installation of dry powder
chemical systems.
(a) Self-contained dry powder chemical systems shall be installed to protect each belt-drive, belt takeup, electrical-controls, gear reducing units and
50 feet of fire-resistant belt or 150 feet
of non-fire-resistant belt adjacent to
the belt drive.
(b) The fire-control components of
each dry powder chemical system shall
be a type approved by the Underwriters’ Laboratories, Inc., or Factory
Mutual Engineering Corp.
(c) The components of each dry powder chemical system shall be located so
as to minimize the possibility of damage by roof fall or by the moving belt
and its load.
§ 75.1101–15 Construction of dry powder chemical systems.
(a) Each self-contained dry powder
system shall be equipped with hose or
pipe lines which are no longer than
necessary.
(b) Metal piping and/or hose between
control valves and nozzles shall have a
610
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00620
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
minimum bursting pressure of 500
p.s.i.g.
(c) Hose shall be protected by wire
braid or its equivalent.
(d) Nozzles and reservoirs shall be
sufficient in number to provide maximum protection to each belt, belt
takeup, electrical controls, and gear
reducing unit.
(e) Each belt shall be protected on
the top surface of both the top and bottom belts and the bottom surface of
the top belt.
§ 75.1101–16 Dry powder chemical systems; sensing and fire-suppression
devices.
(a) Each self-contained dry powder
chemical system shall be equipped with
sensing devices which shall be designed
to activate the fire-control system,
sound an alarm and stop the conveyor
drive motor in the event of a rise in
temperature, and provision shall be
made to minimize contamination of
the lens of any optical sensing device
installed in such system.
(b) Where sensors are operated from
the same power source as the belt
drive, each sensor shall be equipped
with a standby power source which
shall be capable of remaining operative
for at least 4 hours after a power cutoff.
(c) Sensor systems shall include a
warning indicator (or test circuit)
which shows it is operative.
(d) Each fire-suppression system
shall be equipped with a manually operated control valve which shall be
independent of the sensor.
§ 75.1101–17 Sealing of
chemical systems.
dry
powder
Each dry powder chemical system
shall be adequately sealed to protect
all components of the system from
moisture dust, and dirt.
§ 75.1101–18
Dry powder requirements.
Each dry powder chemical system
shall contain the following minimum
amounts of multipurpose dry powder:
Dry
powder,
pounds
kpayne on VMOFRWIN702 with $$_JOB
Belt
Fire resistant ............................................................
Non-fire resistant .....................................................
125
250
§ 75.1103
§ 75.1101–19
rection.
Nozzles; flow rate and di-
The nozzles of each dry powder chemical system shall be capable of discharging all powder within 1 minute
after actuation of the system and such
nozzles shall be directed so as to minimize the effect of ventilation upon fire
control.
§ 75.1101–20 Safeguards for dry powder chemical systems.
Adequate guards shall be provided
along all belt conveyors in the vicinity
of each dry powder chemical system to
protect persons whose vision is restricted by a discharge of powder from
the system. In addition, hand-rails
shall be installed in such areas to provide assistance to those passing along
the conveyor after a powder discharge.
§ 75.1101–21
Back-up water system.
One fire hose outlet together with a
length of hose capable of extending to
the belt drive shall be provided within
300 feet of each belt drive.
§ 75.1101–22 Inspection of dry powder
chemical systems.
(a) Each dry powder chemical system
shall be examined weekly and a functional test of the complete system
shall be conducted at least once each
year.
(b) Where the dry powder chemical
system has been actuated, all components of the system shall be cleaned
immediately by flushing all powder
from pipes and hoses and all hose damaged by fire shall be replaced.
§ 75.1102 Slippage
switches.
and
[STATUTORY PROVISIONS]
Underground belt conveyors shall be
equipped with slippage and sequence
switches.
§ 75.1103 Automatic fire warning devices.
[STATUTORY PROVISIONS]
On or before May 29, 1970, devices
shall be installed on all such belts
which will give a warning automatically when a fire occurs on or near
611
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00621
Fmt 8010
sequence
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.1103–1
30 CFR Ch. I (7–1–19 Edition)
such belt. The Secretary shall prescribe a schedule for installing fire suppression devices on belt haulageways.
§ 75.1103–1 Automatic fire sensors.
A fire sensor system shall be installed on each underground belt conveyor. Sensors so installed shall be of a
type which will (a) give warning automatically when a fire occurs on or near
such belt; (b) provide both audible and
visual signals that permit rapid location of the fire.
§ 75.1103–2 Automatic fire sensors; approved components; installation requirements.
(a) The components of each automatic fire sensor required to be installed in accordance with the provisions of § 75.1103–1 shall be of a type and
installed in a manner approved by the
Secretary, or the components shall be
of a type listed, approved and installed
in accordance with the recommendations of a nationally recognized testing
laboratory approved by the Secretary.
(b) Where applicable, and not inconsistent with these regulations, automatic fire sensors shall be installed in
accordance with the recommendations
set forth in National Fire Code No. 72A
‘‘Local Protective Signaling Systems’’
(NFPA No. 72A–1967). National Fire
Code No. 72A (1967) is hereby incorporated by reference and made a part
hereof. National Fire Code No. 72A is
available for examination at each
MSHA Coal Mine Safety and Health
district office, and may be obtained
from the National Fire Protection Association, 11 Tracy Drive, Avon, MA
02322; Telephone: 800–344–3555 (toll free);
http://www.nfpa.org.
kpayne on VMOFRWIN702 with $$_JOB
[37 FR 16546, Aug. 16, 1972, as amended at 71
FR 16668, Apr. 3, 2006]
§ 75.1103–3 Automatic fire sensor and
warning device systems; minimum
requirements; general.
Automatic fire sensor and warning
device systems installed in belt
haulageways of underground coal
mines shall be assembled from components which meet the minimum requirements set forth in §§ 75.1103–4
through 75.1103–7 unless otherwise approved by the Secretary.
[37 FR 16545, Aug. 16, 1972]
§ 75.1103–4 Automatic fire sensor and
warning device systems; installation; minimum requirements.
(a) Effective December 31, 2009, automatic fire sensor and warning device
systems that use carbon monoxide sensors shall provide identification of fire
along all belt conveyors.
(1) Carbon monoxide sensors shall be
installed at the following locations:
(i) Not more than 100 feet downwind
of each belt drive unit, each tailpiece
transfer point, and each belt take-up. If
the belt drive, tailpiece, and/or take-up
for a single transfer point are installed
together in the same air course, and
the distance between the units is less
than 100 feet, they may be monitored
with one sensor downwind of the last
component. If the distance between the
units exceeds 100 feet, additional sensors are required downwind of each belt
drive unit, each tailpiece transfer
point, and each belt take-up;
(ii) Not more than 100 feet downwind
of each section loading point;
(iii) Along the belt entry so that the
spacing between sensors does not exceed 1,000 feet. Where air velocities are
less than 50 feet per minute, spacing
must not exceed 350 feet; and
(iv) The mine operator shall indicate
the locations of all carbon monoxide
sensors on the mine maps required by
§§ 75.1200 and 75.1505 of this part.
(2) Where used, sensors responding to
radiation, smoke, gases, or other indications of fire, shall be spaced at regular intervals to provide protection
equivalent to carbon monoxide sensors,
and installed within the time specified
in paragraph (a)(3) of this section.
(3) When the distance from the tailpiece at loading points to the first
outby sensor reaches the spacing requirements in § 75.1103–4(a)(1)(iii), an
additional sensor shall be installed and
put in operation within 24 production
shift hours. When sensors of the kind
described in paragraph (a)(2) of this
section are used, they shall be installed
and put in operation within 24 production shift hours after the equivalent
distance which has been established for
the sensor from the tailpiece at loading
points to the first outby sensor is first
reached.
(b) Automatic fire sensor and warning device systems shall be installed so
612
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00622
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1103–5
as to minimize the possibility of damage from roof falls and the moving belt
and its load. Sensors must be installed
near the center in the upper third of
the entry, in a manner that does not
expose personnel working on the system to unsafe conditions. Sensors must
not be located in abnormally high
areas or in other locations where air
flow patterns do not permit products of
combustion to be carried to the sensors.
(c) Infrared, ultraviolet, and other
sensors whose effectiveness is impaired
by contamination shall be protected
from dust, dirt, and moisture.
(d) The voltage of automatic fire sensor and warning device systems shall
not exceed 120 volts.
(e) Except when power must be cut
off in the mine under the provisions of
§ 75.313, automatic fire sensor and
warning device systems shall be capable of giving warning of fire for a minimum of 4 hours after the source of
power to the belt is removed unless the
belt haulageway is examined for hot
rollers and fire as provided in paragraph (e) (1) or (2) of this section.
(1) When an unplanned removal of
power from the belt occurs an examination for hot rollers and fire in the operating belts of a conveyor system shall
be completed within 2 hours after the
belt has stopped.
(2) When a preplanned removal of
power from the belt occurs an examination for hot rollers and fire on the operating belts of a conveyor system may
commence not more than 30 minutes
before the belts are stopped and shall
be completed within 2 hours after the
examination is commenced, or the examination shall be commenced when
the belts are stopped and completed
within 2 hours after the belts are
stopped.
an effective warning signal at the following locations:
(1) At working sections and other
work locations where miners may be
endangered from a fire in the belt
entry.
(2) At a manned surface location
where personnel have an assigned post
of duty. The manned surface location
must have:
(i) A telephone or equivalent communication with all miners who may be
endangered and
(ii) A map or schematic that shows
the locations of sensors, and the intended air flow direction at these locations. This map or schematic must be
updated within 24 hours of any change
in this information.
(3) The automatic fire sensor and
warning device system shall be monitored for a period of 4 hours after the
belt is stopped, unless an examination
for hot rollers and fire is made as prescribed in § 75.1103–4(e).
(b) The fire sensor and warning device system shall include a means for
rapid evaluation of electrical short and
open circuits, ground faults, pneumatic
leaks, or other defect detrimental to
its proper operational condition.
(c) Automatic fire sensor and warning devices shall include a manual
reset feature.
(d) When a malfunction or warning
signal is received at the manned surface location, the sensors that are activated must be identified and appropriate personnel immediately notified.
(e) Upon notification of a malfunction or warning signal, appropriate personnel must immediately initiate an
investigation to determine the cause of
the malfunction or warning signal and
take the required actions set forth in
paragraph (f) of this section.
(f) If any sensor indicates a warning,
the following actions must be taken
unless the mine operator determines
that the signal does not present a hazard to miners:
(1) Appropriate personnel must notify
miners in affected working sections, in
affected areas where mechanized mining equipment is being installed or removed, and at other locations specified
in the approved mine emergency evacuation and firefighting program of instruction; and
[37 FR 16545, Aug. 16, 1972, as amended at 57
FR 20928, May 15, 1992; 73 FR 80614, Dec. 31,
2008]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1103–5 Automatic fire warning devices; actions and response.
(a) When the carbon monoxide level
reaches 10 parts per million above the
established ambient level at any sensor
location, automatic fire sensor and
warning device systems shall provide
613
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00623
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1103–6
30 CFR Ch. I (7–1–19 Edition)
(2) All miners in the affected areas,
unless assigned emergency response duties, must be immediately withdrawn
to a safe location identified in the
mine emergency evacuation and firefighting program of instruction.
(g) If the warning signal will be activated during calibration of sensors,
personnel manning the surface location
must be notified prior to and upon
completion of calibration. Affected
working sections, areas where mechanized mining equipment is being installed or removed, or other areas designated in the approved emergency
evacuation and firefighting program of
instruction must be notified at the beginning and completion of calibration.
(h) If any fire detection component
becomes inoperative, immediate action
must be taken to repair the component. While repairs are being made, operation of the belt may continue if the
following requirements are met:
(1) If one sensor becomes inoperative,
a trained person must continuously
monitor for carbon monoxide at the inoperative sensor;
(2) If two or more adjacent sensors
become inoperative, trained persons
must patrol and continuously monitor
the affected areas for carbon monoxide
so that they will be traveled each hour
in their entirety. Alternatively, a
trained person must be stationed at
each inoperative sensor to monitor for
carbon monoxide;
(3) If the complete fire detection system becomes inoperative, trained persons must patrol and continuously
monitor the affected areas for carbon
monoxide so that they will be traveled
each hour in their entirety;
(4) Trained persons who conduct
monitoring under this section must
have two-way voice communication capability, at intervals not to exceed
2,000 feet, and must report carbon monoxide concentrations to the surface at
intervals not to exceed one hour;
(5) Trained persons who conduct
monitoring under this section must immediately report to the surface any
concentration of carbon monoxide that
reaches 10 parts per million above the
established ambient level, unless the
mine operator knows that the source of
the carbon monoxide does not present a
hazard to miners; and
(6) Handheld detectors used to monitor the belt entry under this section
must have a detection level equivalent
to that of the system’s carbon monoxide sensors.
[37 FR 16545, Aug. 16, 1972, as amended at 73
FR 80615, Dec. 31, 2008]
§ 75.1103–6 Automatic fire sensors; actuation of fire suppression systems.
Point-type heat sensors or automatic
fire sensor and warning device systems
may be used to actuate deluge-type
water systems, foam generator systems, multipurpose dry-powder systems, or other equivalent automatic
fire suppression systems.
[73 FR 80615, Dec. 31, 2008]
§ 75.1103–7 Electrical components; permissibility requirements.
The electrical components of each
automatic fire sensor and warning device system shall:
(a) Remain functional when the
power circuits are deenergized as required by § 75.706; and
(b) Be provided with protection
against ignition of methane or coal
dust when the electrical power is deenergized as required by § 75.313, but these
components shall be permissible or intrinsically safe if installed in a return
airway.
[37 FR 16546, Aug. 16, 1972, as amended at 57
FR 20929, May 15, 1992]
§ 75.1103–8 Automatic fire sensor and
warning device systems; examination and test requirements.
(a) Automatic fire sensor and warning device systems shall be examined
at least once each shift when belts are
operated as part of a production shift.
A functional test of the warning signals shall be made at least once every
seven days. Examination and maintenance of such systems shall be by a
qualified person.
(b) A record of the functional test
conducted in accordance with paragraph (a) of this section shall be maintained by the operator and kept for a
period of one year.
(c) Sensors shall be calibrated in accordance with the manufacturer’s calibration instructions at intervals not to
exceed 31 days. A record of the sensor
614
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00624
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1106
calibrations shall be maintained by the
operator and kept for a period of one
year.
(d) The fire suppression system required at the belt drive shall include
the belt discharge head.
(e) A crew consisting of at least five
members for each working shift shall
be trained in firefighting operations.
Fire drills shall be held at intervals not
exceeding 6 months.
kpayne on VMOFRWIN702 with $$_JOB
[73 FR 80615, Dec. 31, 2008]
§ 75.1103–9 Minimum
requirements;
fire suppression materials and location; maintenance of entries and
crosscuts; access doors; communications; fire crews; high-expansion
foam devices.
(a) The following materials shall be
stored within 300 feet of each belt drive
or at a location where the material can
be moved to the belt drive within 5
minutes, except that when the ventilating current in the belt haulageway
travels in the direction of the normal
movement of coal on the belt, the materials shall be stored within 300 feet of
the belt tailpiece or at a location
where the materials can be moved to
the belt tailpiece within 5 minutes.
(1) 500 feet of fire hose, except that if
the belt flight is less than 500 feet in
length the fire hose may be equal to
the length of the belt flight. A high expansion foam device may be substituted for 300 feet of the 500 feet of
the fire hose. Where used, such foam
generators shall produce foam sufficient to fill 100 feet of the belt
haulageway in not more than 5 minutes. Sufficient power cable and water
hose shall be provided so that the foam
generator can be installed at any crosscut along the belt by which the generator is located. A 1-hour supply of foam
producing chemicals and tools and
hardware required for its operation
shall be stored at the foam generator.
(2) Tools to open a stopping between
the belt entry and the adjacent intake
entry; and
(3) 240 pounds of bagged rock dust.
(b) The entry containing the main
waterline and the crosscuts containing
water outlets between such entry and
the belt haulageway (if the main waterline is in an adjacent entry) shall be
maintained accessible and in safe condition for travel and firefighting activities. Each stopping in such crosscuts or adjacent crosscuts shall have
an access door.
(c) Suitable communication lines extending to the surface shall be provided
in the belt haulageway or adjacent
entry.
[37 FR 16546, Aug. 16, 1972]
§ 75.1103–10 Fire suppression systems;
additional requirements.
For each conveyor belt flight exceeding 2,000 feet in length, where the average air velocity along the belt haulage
entry exceeds 100 feet per minute, an
additional cache of the materials specified in § 75.1103–9(a)(1), (2), and (3) shall
be provided. The additional cache may
be stored at the locations specified in
§ 75.1103–9(a), or at some other strategic
location readily accessible to the conveyor belt flight.
[73 FR 80616, Dec. 31, 2008]
§ 75.1103–11 Tests of fire hydrants and
fire hose; record of tests.
Each fire hydrant shall be tested by
opening to insure that it is in operating condition, and each fire hose
shall be tested, at intervals not exceeding 1 year. A record of these tests shall
be maintained at an appropriate location.
[37 FR 16546, Aug. 16, 1972]
§ 75.1104 Underground storage, lubricating oil and grease.
[STATUTORY PROVISIONS]
Underground storage places for lubricating oil and grease shall be of fireproof construction. Except for specially
prepared materials approved by the
Secretary, lubricating oil and grease
kept in all underground areas in a coal
mine shall be in fireproof, closed metal
containers or other no less effective
containers approved by the Secretary.
§ 75.1106 Welding, cutting, or soldering
with arc or flame underground.
[STATUTORY PROVISIONS]
All welding, cutting, or soldering
with arc or flame in all underground
areas of a coal mine shall, whenever
practicable, be conducted in fireproof
615
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00625
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
§ 75.1106–1
30 CFR Ch. I (7–1–19 Edition)
enclosures. Welding, cutting, or soldering with arc or flame in other than
a fireproof enclosure shall be done
under the supervision of a qualified
person who shall make a diligent
search for fire during and after such
operations and shall, immediately before and during such operations, continuously test for methane with means
approved by the Secretary for detecting methane. Welding, cutting, or soldering shall not be conducted in air
that contains 1.0 volume per centum or
more of methane. Rock dust or suitable
fire extinguishers shall be immediately
available during such welding, cutting
or soldering.
§ 75.1106–1
Test for methane.
Until December 31, 1970, a permissible
flame safety lamp may be used to
make tests for methane required by the
regulations in this part. On and after
December 31, 1970 a methane detector
approved by the Secretary shall be
used for such tests and a permissible
flame safety lamp may be used as a
supplemental testing device. A person
qualified to test for methane under
§ 75.151 will be a qualified person for the
purpose of this section.
TRANSPORTATION, HANDLING AND STORAGE OF LIQUEFIED AND NONLIQUEFIED
COMPRESSED GAS CYLINDERS
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1106–2 Transportation of liquefied
and nonliquefied compressed gas
cylinders; requirements.
(a) Liquefied and nonliquefied compressed gas cylinders transported into
or through an underground coal mine
shall be:
(1) Placed securely in devices designed to hold the cylinder in place
during transit on self-propelled equipment or belt conveyors;
(2) Disconnected from all hoses and
gages;
(3) Equipped with a metal cap or
‘‘headband’’ (fence-type metal protector around the valve stem) to protect the cylinder valve during transit;
and,
(4) Clearly labeled ‘‘empty’’ or ‘‘MT’’
when the gas in the cylinder has been
expended.
(b) In addition to the requirements of
paragraph (a) of this section, when liq-
uefied and nonliquefied compressed gas
cylinders are transported by a trolley
wire haulage system into or through an
underground coal mine, such cylinders
shall be placed in well insulated and
substantially constructed containers
which are specifically designed for
holding such cylinders.
(c) Liquefied and nonliquefied compressed gas cylinders shall not be
transported on mantrips.
[36 FR 22061, Nov. 19, 1971]
§ 75.1106–3 Storage of liquefied and
nonliquefied compressed gas cylinders; requirements.
(a) Liquefied and nonliquefied compressed gas cylinders stored in an underground coal mine shall be:
(1) Clearly marked and identified as
to their contents in accordance with
Department of Transportation regulations.
(2) Placed securely in storage areas
designated by the operator for such
purpose, and where the height of the
coalbed permits, in an upright position,
preferably in specially designated
racks, or otherwise secured against
being accidently tipped over.
(3) Protected against damage from
falling material, contact with power
lines and energized electrical equipment, heat from welding, cutting or
soldering, and exposure to flammable
liquids.
(b) Liquefied and nonliquefied compressed gas cylinders shall not be
stored or left unattended in any area
inby the last open crosscut of an underground coal mine.
(c) When not in use, the valves of all
liquefied and nonliquefied compressed
gas cylinders shall be in the closed position, and all hoses shall be removed
from the cylinder.
[36 FR 22061, Nov. 19, 1971]
§ 75.1106–4 Use of liquefied and nonliquefied compressed gas cylinders;
general requirements.
(a) Persons assigned by the operator
to use and work with liquefied and nonliquefied compressed gas shall be
trained and designated by the operator
as qualified to perform the work to
which they are assigned, and such
qualified persons shall be specifically
instructed with respect to the dangers
616
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00626
Fmt 8010
Sfmt 8002
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1107
inherent in the use of such gases in an
underground coal mine.
(b) Persons who perform welding,
cutting, or burning operations shall
wear clothing free from excessive oil or
grease.
(c) Liquefied and nonliquefied compressed gas shall be used only in wellventilated areas.
(d) Not more than one liquefied or
nonliquefied compressed gas unit, consisting of one oxygen cylinder and one
additional gas cylinder, shall be used
to repair any unit of equipment which
is inby the loading point of any section.
(e) Where liquefied and nonliquefied
compressed gas is used regularly in underground shops or other underground
structures, such shops or structures
shall be on a separate split of air.
(f) Where liquefied and nonliquefied
compressed gas is used in any area in
which oil, grease, or coal dust is
present, oil and grease deposits shall,
where practicable, be removed and the
entire area within 10 feet of the worksite covered with a heavy coating of
rock dust.
(g) Liquefied and nonliquefied compressed gas cylinders shall be located
no less than 10 feet from the worksite,
and where the height of the coal seam
permits, they shall be placed in an upright position and chained or otherwise
secured against falling.
(h) Liquefied and nonliquefied compressed gas shall not be used under direct pressure from the cylinder and,
where such gases are used under reduced pressure, the pressure level shall
not exceed that recommended by the
manufacturer.
(i) ‘‘Manifolding cylinders’’ shall
only be performed in well-ventilated
shops where the necessary equipment
is properly installed and operated in
accordance with specifications for safety prescribed by the manufacturer.
(b) Defective cylinders, cylinder accessories, torches, and other welding,
cutting, and burning equipment shall
be labeled ‘‘defective’’ and taken out of
service.
(c) Each qualified person assigned to
perform welding, cutting, or burning
with liquefied and nonliquefied compressed gas shall be equipped with a
wrench specifically designed for use
with liquefied and nonliquefied compressed gas cylinders and a suitable
torchtip cleaner to maintain torches in
a safe operating condition.
(d) Tests for leaks on the hose valves
or gages of liquefied and nonliquefied
compressed gas cylinders shall only be
made with a soft brush and soapy water
or soap suds, or other device approved
by the Secretary.
[36 FR 22061, Nov. 19, 1971]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1106–5 Maintenance and tests of
liquefied and nonliquefied compressed gas cylinders; accessories
and equipment; requirements.
(a) Hose lines, gages, and other cylinder accessories shall be maintained
in a safe operating condition.
[36 FR 22062, Nov. 19, 1971]
§ 75.1106–6 Exemption of small low
pressure gas cylinders containing
nonflammable or nonexplosive gas
mixtures.
Small low pressure gas cylinders containing nonflammable or nonexplosive
gas mixtures, which provide for the
emission of such gas under a pressure
reduced from a pressure which does not
exceed 250 p.s.i.g., and which is manufactured and sold in conformance with
U.S. Department of Transportation
Special Permit No. 6029 as a calibration
test kit for methane monitoring systems, shall be exempt from the requirements of §§ 75.1106–2(c) and 75.1106–4(d),
(f) and (g).
[36 FR 22062, Nov. 19, 1971]
FIRE SUPPRESSION DEVICES AND FIRERESISTANT HYDRAULIC FLUIDS ON UNDERGROUND EQUIPMENT
§ 75.1107
Fire suppression devices.
[STATUTORY PROVISIONS]
On and after March 30, 1971, fire-suppression devices meeting specifications
prescribed by the Secretary shall be installed on unattended underground
equipment and suitable fire-resistant
hydraulic fluids approved by the Secretary shall be used in the hydraulic
systems of such equipment. Such fluids
shall be used in the hydraulic systems
of other underground equipment unless
617
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00627
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1107–1
30 CFR Ch. I (7–1–19 Edition)
fire suppression devices meeting specifications prescribed by the Secretary
are installed on such equipment.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1107–1 Fire-resistant
hydraulic
fluids and fire suppression devices
on underground equipment.
(a)(1) Unattended electrically powered equipment used underground
which uses hydraulic fluid shall use approved fire-resistant hydraulic fluid.
(2) Except as provided in paragraph
(a) (3) of this section, within 24 production shift hours after being installed,
unattended electrically powered equipment used underground shall be
equipped with a fire suppression device
which meets the applicable requirements of §§ 75.1107–3 through 75.1107–16.
(3) Unattended enclosed motors, controls, transformers, rectifiers, and
other similar noncombustible electrically powered equipment containing
no flammable fluid may be protected:
(i) By an approved fire suppression
device, or
(ii) Be located at least 2 feet from
coal or other combustible materials, or
(iii) Be separated from the coal or
combustible materials by a 4-inchthick masonry firewall or equivalent;
and be mounted on a minimum 4-inchthick noncombustible surface, platform, or equivalent. The electrical cables at such equipment shall conform
with the requirements of Part 18 of this
chapter (Bureau of Mines Schedule 2G)
or be in metal conduit.
(b) Attended electrically powered
equipment used underground which
uses hydraulic fluid shall use approved
fire-resistant hydraulic fluid unless
such equipment is protected by a fire
suppression device which meets the applicable requirements of §§ 75.1107–3—
75.1107–16.
(c) For purpose of §§ 75.1107—75.1107–16
the following underground equipment
shall be considered attended equipment:
(1) Any machine or device regularly
operated by a miner assigned to operate such machine or device;
(2) Any machine or device which is
mounted in the direct line of sight of a
jobsite which is located within 500 feet
of such machine or device and which
jobsite is regularly occupied by a
miner assigned to perform job duties at
such jobsite during each production
shift.
(d) Machines and devices described
under paragraph (c) of this section
must be inspected for fire and the input
powerline deenergized when workmen
leave the area for more than 30 minutes.
[37 FR 15301, July 29, 1972]
§ 75.1107–2 Approved fire-resistant hydraulic fluids; minimum requirements.
Fire-resistant hydraulic fluids and
concentrates required to be employed
in the hydraulic system of underground
equipment in accordance with the provisions of § 75.1107–1 shall be considered
suitable only if they have been produced under an approval, or any modification thereof, issued pursuant to
Part 35 Subchapter I of this chapter
(Bureau of Mines Schedule 30), or any
revision thereof.
[37 FR 15301, July 29, 1972]
§ 75.1107–3 Fire suppression devices;
approved components; installation
requirements.
(a) The components of each fire suppression device required to be installed
in accordance with the provisions of
§ 75.1107–1 shall be approved by the Secretary, or where appropriate be listed
as approved by a nationally recognized
agency approved by the Secretary.
(b) Where used, pressure vessels shall
conform with the requirements of sections 3603, 3606, 3607, 3707, and 3708 of
National Fire Code No. 22 ‘‘Water
Tanks for Private Fire Protection’’
(NFPA No. 22–1971).
(c) The cover of hose of fire suppression devices, if used on the protected
equipment and installed after the effective date of this section, shall meet the
flame-resistant requirements of Part 18
of this chapter (Bureau of Mines Schedule 2G).
(d) Fire suppression devices required
to be installed in accordance with the
provisions of § 75.1107–1 shall where appropriate be installed in accordance
with the manufacturer’s specifications.
[37 FR 15301, July 29, 1972]
618
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00628
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1107–6
§ 75.1107–4 Automatic fire sensors and
manual actuators; installation; minimum requirements.
(a)(1) Where fire suppression devices
are installed on unattended underground equipment, one or more pointtype sensors or equivalent shall be installed for each 50 square feet of top
surface area, or fraction thereof, of
such equipment, and each sensor shall
be designed to activate the first suppression system and disconnect the
electrical power source to the equipment protected, and, except where
sprinklers are used, there shall be in
addition, a manual actuator installed
to operate the system. Where sprinklers are used, provision shall be made
for manual application of water to the
protected equipment in lieu of a manual actuator.
(2) Two or more manual actuators,
where practicable, shall be installed, as
provided in paragraphs (a)(2) (i) and (ii)
of this section, to activate fire suppression devices on attended equipment
purchased on or after the effective date
of this § 75.1107–4. At least one manual
actuator shall be used on equipment
purchased prior to the effective date of
this § 75.1107–4.
(i) Manual actuators installed on attended equipment regularly operated
by a miner, as provided in § 75.1107–
1(c)(1) shall be located at different locations on the equipment, and at least
one manual actuator shall be located
within easy reach of the operator’s normal operating position.
(ii) Manual actuators to activate fire
suppression devices on attended equipment not regularly operated by a
miner, as provided in § 75.1107–1(c)(2),
shall be installed at different location,
and at least one manual actuator shall
be installed so as to be easily reached
by the miner at the jobsite or by persons approaching the equipment.
(b) Sensors shall, where practicable,
be installed in accordance with the recommendations set forth in National
Fire Code No. 72A ‘‘Local Protective
Signaling Systems’’ (NFPA No. 72A–
1967).
(c) On unattended equipment the fire
suppression device shall operate independently of the power to the main
motor (or equivalent) so it will remain
operative if the circuit breakers (or
other protective device) actuates. On
attended equipment powered through a
trailing cable the fire suppression device shall operate independently of the
electrical power provided by the cable.
(d) Point-type sensors (such as thermocouple, bimetallic strip, or rate of
temperature rise) located in ventilated
passageways shall be installed downwind from the equipment to be protected.
(e) Sensor systems shall include a device or method for determining their
operative condition.
[37 FR 15301, July 29, 1972]
§ 75.1107–5 Electrical components of
fire suppression devices; permissibility requirements.
The electrical components of each
fire suppression device used on permissible equipment inby the last open
crosscut or on equipment in the return
airways of any coal mine shall be permissible or intrinsically safe and such
components shall be maintained in permissible or intrinsically safe condition.
[37 FR 15302, July 29, 1972]
§ 75.1107–6 Capacity of fire suppression devices; location and direction
of nozzles.
(a) Each fire suppression device shall
be:
(1) Adequate in size and capacity to
extinguish potential fires in or on the
equipment protected; and
(2) Suitable for the atmospheric conditions surrounding the equipment protected (e.g., air velocity, type, and
proximity of adjacent combustible material); and
(3) Rugged enough to withstand
rough usage and vibration when installed on mining equipment.
(b) The extinguishant-discharge nozzles of each fire suppression device
shall, where practicable, be located so
as to take advantage of mine ventilation air currents. The fire suppression
device may be of the internal injection,
inundating, or combination type.
Where fire control is achieved by internal injection, or combination of internal injection and inundation, hazardous locations shall be enclosed to
minimize runoff and overshoot of the
extinguishing agent and the extinguishing agent shall be directed onto:
619
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00629
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1107–7
30 CFR Ch. I (7–1–19 Edition)
(1) Cable reel compartments and electrical cables on the equipment which
are subject to flexing or to external
damage; and
(2) All hydraulic components on the
equipment which are exposed directly
to or located in the immediate vicinity
of electrical cables which are subject
to flexing or to damage.
[37 FR 15302, July 29, 1972]
§ 75.1107–7 Water spray devices; capacity; water supply; minimum requirements.
(a) Where water spray devices are
used on unattended underground equipment the rate of flow shall be at least
0.25 gallon per minute per square foot
over the top surface area of the equipment and the supply of water shall be
adequate to provide the required flow
of water for 10 minutes.
(b) Where water spray devices are
used for inundating attended underground equipment the rate of flow shall
be at least 0.18 gallon per minute per
square foot over the top surface area of
the equipment (excluding conveyors,
cutters, and gathering heads), and the
supply of water shall be adequate to
provide the required flow of water for
10 minutes.
(c) Where water is used for internal
injection on attended equipment the
total quantity of water shall be at
least 4.5 gallons times the number of
hazardous locations; however, the total
minimum amount of water shall not be
less than the following:
Water in
gallons
Type of equipment
kpayne on VMOFRWIN702 with $$_JOB
(1)
(2)
(3)
(4)
Cutting machines ...........................................
Continuous miners .........................................
Haulage vehicles ............................................
All other attended equipment .........................
36
36
22.5
18.0
The rate of flow shall be not less than
7 gallons per minute.
(d) Where water is used in a combination internal injection and inundation
system on attended equipment the rate
of flow shall be at least 0.12 gallon per
minute per square foot over the top
surface area of the equipment (excluding conveyors, cutters, and gathering
heads), and the supply of water shall be
adequate to provide the required flow
of water for 10 minutes.
(e) On equipment provided with a
cable reel and an internal injection or
combination-type system, the amount
of water discharged into the cable reel
compartments shall be approximately
25 percent of the amount required to be
discharged by the system, however,
such quantity need not exceed 10 gallons.
(f) Liquid chemicals may be used, as
approved by the Secretary in self-contained fire suppression devices. Such
liquid chemicals shall be nontoxic and
when applied to a fire shall not produce
excessive toxic compounds. The quantity of liquid chemicals required shall
be proportionately less than water as
based on equivalency ratings established by the Secretary or equivalency
ratings made by a nationally recognized agency approved by the Secretary.
[37 FR 15302, July 29, 1972]
§ 75.1107–8 Fire suppression devices;
extinguishant supply systems.
(a) Fire suppression systems using
water or liquid chemical to protect attended equipment shall:
(1) Be maintained at a pressure consistent with the pipe, fittings, valves,
and nozzles used in the system.
(2) Be located so as to be protected
against damage during operation of the
equipment protected.
(3) Employ liquid which is free from
excessive sediment and noncorrosive to
the system.
(4) Include strainers equipped with
flush-out connections or equivalent
protective devices and a rising stem or
other visual indicator-type shutoff
valve.
(b) Water supplies for fire suppression
devices
installed
on
underground
equipment may be maintained in
mounted water tanks or by connection
to water mains. Such water supplies
shall be continuously connected to the
fire suppression device whenever the
equipment is connected to a power
source, except for a reasonable time for
changing hose connections to hydrants
while the machine is stopped in a ventilated passageway.
[37 FR 15302, July 29, 1972]
620
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00630
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1107–10
§ 75.1107–9 Dry chemical devices; capacity; minimum requirements.
(a) Dry chemical fire extinguishing
systems used on underground equipment shall be of the multipurpose powder-type and shall include the following:
(1) The system including all hose and
nozzles shall be protected against the
entrance of moisture, dust, or dirt;
(2) The system shall be guarded
against damage during operation of the
equipment protected;
(3) Hose and pipe shall be as short as
possible; the distance between the
chemical container and furthest nozzle
shall not exceed 50 feet;
(4) Hose, piping, and fittings between
the actuator and the chemical container shall have a bursting pressure of
500 pounds per square inch (gage) or
higher; the hose, piping, and fittings
between the chemical container and
the nozzles shall have a bursting pressure of 300 pounds per square inch
(gage) or higher and
(5) The system shall discharge in 1
minute or less, for quantities less than
50 pounds (nominal) 1 and in less than 2
minutes for quantities more than 50
pounds;
(b) On unattended underground
equipment, the number of pounds of
dry chemical employed by the system
shall be not less than 1 pound per
square foot of top surface area of the
equipment; however, the minimum
amount in any system shall be 20
pounds (nominal). The discharge shall
be directed into and on potentially hazardous locations of the equipment.
(c) On attended underground equipment, the number of pounds (nominal)
employed by the system shall equal 5
times the total number of hazardous
locations; however, the minimum
amount in any system shall not be less
than the following, except that systems on haulage vehicles installed
prior to the effective date of this section may contain 20 pounds (nominal).
1 Many dry chemical systems were originally designed for sodium bicarbonate before
all-purpose chemical (ammonium phosphate)
was shown to be more effective. Sodium bicarbonate is denser than ammonium phosphate; hence, for example, a 50-pound system
designed for the sodium bicarbonate will
hold slightly more by weight than all-purpose dry chemical (ammonium phosphate) by
weight. The word ‘‘nominal’’ is used in
§ 75.1107–9 to express the approximate weight
in pounds of all-purpose dry chemical.
Type of equipment
(1)
(2)
(3)
(4)
Cutting machines ...........................................
Continuous miners .........................................
Haulage vehicles ............................................
All other attended equipment .........................
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00631
Fmt 8010
40
40
30
20
(d) The amount of dry chemical discharged into the cable reel compartments of attended underground equipment shall be approximately 25 percent
of the total amount required to be discharged by the system; however, the
quantity discharged into cable reel
compartments need not exceed 10
pounds.
[37 FR 15302, July 29, 1972]
§ 75.1107–10 High expansion foam devices; minimum capacity.
(a) On unattended underground
equipment the amount of water delivered as high expansion foam for a period of approximately 20 minutes shall
be not less than 0.06 gallon per minute
per square foot of surface area of the
equipment protected; however, the
minimum total rate for any system
shall be not less than 3 gallons per
minute.
(b) On attended underground equipment, foam may be delivered by internal injection, inundation, or combination-type systems. Each system shall
deliver water as foam for a minimum
of 10 minutes. For internal injection,
the rate of water application as high
expansion foam shall be not less than
0.5 gallon per minute per hazardous location; however, the minimum total
rate shall be not less than 2 gallons per
minute. For inundation, the rate of
water application as high expansion
foam shall be not less than 0.05 gallon
per minute per square foot of top surface area of the equipment protected;
however, the minimum total rate shall
be not less than 5 gallons of water per
minute.
(c) In combined internal injection
and inundation systems the rate of
water applied as foam shall not be less
than 0.035 gallon per minute per square
621
VerDate Sep<11>2014
Dry chemical
pounds
(nominal)
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1107–11
30 CFR Ch. I (7–1–19 Edition)
foot of top surface area of the equipment protected; however, the minimum
total rate shall not be less than 3.5 gallons of water per minute.
(d) Where internal injection is employed, the amount of water discharged
as high expansion foam into the cable
reel compartments of underground
equipment regularly operated by a
miner shall be approximately 25 percent of the total amount required to be
discharged by the system; however, the
quantity of water discharged as foam
into the cable reel compartment need
not exceed 1.5 gallons.
[37 FR 15303, July 29, 1972]
§ 75.1107–11 Extinguishing agents; requirements on mining equipment
employed in low coal.
On mining equipment no more than
32 inches high, the quantity of extinguishing agent required under the provisions of §§ 75.1107–7, 75.1107–9, and
75.1107–10 may be reduced by one-fourth
if space limitations on the equipment
require such reduction.
[37 FR 15303, July 29, 1972]
§ 75.1107–12 Inerting of mine atmosphere prohibited.
No fire suppression device designed
to control fire by total flooding shall
be installed to protect unattended underground equipment except in enclosed dead-end entries or enclosed
rooms.
[37 FR 15303, July 29, 1972]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1107–13 Approval of
suppression devices.
other
fire
Notwithstanding the provisions of
§§ 75.1107–1 through 75.1107–12 the District Manager for the District in which
the mine is located may approve any
other fire suppression system or device
which provides substantially equivalent protection as would be achieved
through compliance with those sections: Provided, That no such system or
device shall be approved which does not
meet the following minimum criteria:
(a) Components shall be approved by
the Secretary, or where appropriate be
listed as approved by a nationally recognized agency approved by the Secretary.
(b) The fire suppression equipment
shall be designed to withstand the rigors of the mine environment. Where
used, pressure vessels shall conform
with the requirements of section 3603,
3606, 3607, 3707, and 3708 of National
Fire Code No. 22 ‘‘Water Tanks for Private Fire Protection’’ (NFPA No. 22–
1971).
(c) The cover of hose of fire suppression devices, if used on the protected
equipment, shall meet the flame-resistant requirements of Part 18 of this
chapter (Bureau of Mines Schedule 2G).
(d) Extinguishing agents shall not
create a serious toxic or other hazard
to the miners.
(e) The electrical components of the
fire suppression device shall meet the
requirements for electrical components
of the mining machine.
(f) Where used, manual actuators for
initiating the operation of the fire suppression device shall be readily accessible to the machine operator. On unattended equipment, an automatic as
well as a manual actuator shall be provided.
(g) On unattended equipment the fire
suppression device shall operate independently of the power to the main
motor (or equivalent) so it will remain
operative if the circuit breakers (or
other protective device) actuates. On
attended equipment powered through a
trailing cable the fire suppression device shall operate independently of the
electrical power provided by the cable.
(h) On unattended equipment, the
sensor system shall have a means for
checking its operative condition.
(i) The fire suppression agent shall be
directed at locations where the greatest potential fire hazard exists. Cable
reel compartments shall receive approximately twice the quantity of extinguishing agent as each other hazardous location.
(j) The rate of application of the fire
suppression agent shall minimize the
time for quenching and the total quantity applied shall be sufficient to
quench a fire in its incipient stage.
(k) The effectiveness of the quenching agent, together with the total
quantity of agent and its rate of application shall provide equivalent protection to the water, dry powder, or foam
622
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00632
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1107–16
systems
described
in
§§ 75.1107–7,
75.1107–9, and 75.1107–10.
(l) The fire suppression device shall
be operable at all times electrical
power is connected to the mining machine, except during tramming when
the machine is in a ventilated passageway, the water hose if used, may be
switched from one hydrant to another
in a reasonable time and except in systems meeting the minimum special criteria set forth in paragraph (m) of this
section.
(m) Systems for attended equipment
which are not continuously connected
to a water supply shall not be approved
unless they meet the following minimum criteria:
(1) The machine shall be equipped
with a firehose at least 50 feet in
length which is continuously connected
to the machine-mounted portion of the
system.
(2) Hydrants in proximity to the area
where the machine is to be used shall
be equipped with sufficient hose to
reach the machine at any time it is
connected to a power source.
(3) The machine shall be used only
where the operator (or other person)
will always be in ventilated air
uncontaminated by smoke and hot
gases from the machine fire while extending the machine-mounted hose to
connect with the hydrant-mounted
hose.
(4) The machine and hydrant hoses
shall be readily accessible so that the
connection between the machinemounted hose and the hydrant hose
can be made and water flow achieved in
not more than 3 minutes under actual
mining conditions for any location of
the machine while electric power is
connected.
(5) The rate of water flow at the machine shall provide a minimum of 0.12
gallon of water per minute per square
foot of top surface area (excluding conveyors, cutters, and gathering heads).
The water shall discharge to all hazardous locations on the machine.
(6) Hose, if used on the machine, in
addition to meeting the flame resistant
requirements for the cover of a hose
provided in §§ 75.1107–3(b) and 75.1107–
13(c) shall have a minimum burst pressure 4 times that of the static water
pressure at the mining machine. Fabric
braid hose shall have at least two
braids, and wire braid hose shall have
at least a single braid.
(7) In addition to the hose located at
the hydrant (which is intended to be
connected to the hose on the machine)
the firefighting equipment required by
§ 75.1100–2(a) shall be maintained.
(8) A sufficient number of trained
miners shall be kept on the section
when the machine is in use to connect
the machine hose to the hydrant hose
and achieve water flow in not more
than 3 minutes.
[37 FR 15303, July 29, 1972]
§ 75.1107–14 Guards and handrails; requirements where fire suppression
devices are employed.
All unattended underground equipment provided with fire suppression devices which are mounted in dead end
entries, enclosed rooms or other potentially hazardous locations shall be
equipped with adequate guards at moving or rotating components. Handrails
or other effective protective devices
shall be installed at such locations
where necessary to facilitate rapid
egress from the area surrounding such
equipment.
[37 FR 15303, July 29, 1972]
§ 75.1107–15 Fire suppression devices;
hazards; training of miners.
Each operator shall instruct all miners normally assigned to the active
workings of the mine with respect to
any hazards inherent in the operation
of all fire suppression devices installed
in accordance with § 75.1107–1 and,
where appropriate, the safeguards
available at each such installation.
[37 FR 15303, July 29, 1972]
§ 75.1107–16 Inspection of fire suppression devices.
(a) All fire suppression devices shall
be visually inspected at least once each
week by a person qualified to make
such inspections.
(b) Each fire suppression device shall
be tested and maintained in accordance
with the requirements specified in the
appropriate National Fire Code listed
as follows for the type and kind of device used:
623
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00633
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1107–17
30 CFR Ch. I (7–1–19 Edition)
National Fire Code No. 11A ‘‘High Expansion
Foam Systems’’ (NFPA No. 11A—1970).
National Fire Code No. 13A ‘‘Care and Maintenance of Sprinkler Systems’’ (NFPA No.
13A—1971).
National Fire Code No. 15 ‘‘Water Spray
Fixed Systems for Fire Protection’’ (NFPA
No. 15—1969).
National Fire Code No. 17 ‘‘Dry Chemical Extinguishing Systems’’ (NFPA No. 17—1969).
National Fire Code No. 72A ‘‘Local Protective Signaling Systems’’ (NFPA No. 72A—
1967).
National Fire Code No. 198 ‘‘Care of Fire
Hose’’ (NFPA No. 198—1969).
(c) A record of the inspections required by this section shall be maintained by the operator. The record of
the weekly inspections may be maintained at an appropriate location by
each fire suppression device.
[37 FR 15304, July 29, 1972, as amended at 60
FR 33723, June 29, 1995]
§ 75.1107–17 Incorporation
by
reference; availability of publications.
In accordance with 5 U.S.C. 552(a),
the technical publications to which reference is made in §§ 75.1107–1 through
75.1107–16, and which have been prepared by organizations other than the
Bureau of Mines or the Mine Safety
and Health Administration, are hereby
incorporated by reference and made a
part hereof. The incorporated publications are available for examination at
each MSHA Coal Mine Safety and
Health district office. National Fire
Codes are available from the National
Fire Protection Association, 11 Tracy
Drive, Avon, MA 02322; Telephone: 800–
344–3555 (toll free); http://www.nfpa.org.
kpayne on VMOFRWIN702 with $$_JOB
[37 FR 15304, July 29, 1972, as amended at 71
FR 16669, Apr. 3, 2006]
§ 75.1108 Approved conveyor belts.
(a) Until December 31, 2009 conveyor
belts placed in service in underground
coal mines shall be:
(1) Approved under Part 14; or
(2) Accepted under Part 18.
(b) Effective December 31, 2009 conveyor belts placed in service in underground coal mines shall be approved
under Part 14. If MSHA determines
that Part 14 approved belt is not available, the Agency will consider an extension of the effective date.
(c) Effective December 31, 2018 all
conveyor belts used in underground
coal mines shall be approved under
Part 14.
[73 FR 80616, Dec. 31, 2008]
Subpart M—Maps
§ 75.1200
Mine map.
[STATUTORY PROVISIONS]
The operator of a coal mine shall
have in a fireproof repository located
in an area on the surface of the mine
chosen by the mine operator to minimize the danger of destruction by fire
or other hazard, an accurate and up-todate map of such mine drawn on scale.
Such map shall show:
(a) The active workings;
(b) All pillared, worked out, and
abandoned areas, except as provided in
this section;
(c) Entries and aircourses with the
direction of airflow indicated by arrows;
(d) Contour lines of all elevations;
(e) Elevations of all main and cross
or side entries;
(f) Dip of the coalbed;
(g) Escapeways;
(h) Adjacent mine workings within
1,000 feet;
(i) Mines above or below;
(j) Water pools above; and
(k) Either producing or abandoned oil
and gas wells located within 500 feet of
such mine and any underground area of
such mine; and,
(l) Such other information as the
Secretary may require. Such map shall
identify those areas of the mine which
have been pillared, worked out, or
abandoned, which are inaccessible or
cannot be entered safely and on which
no information is available.
§ 75.1200–1 Additional information on
mine map.
Additional information required to
be shown on mine maps under § 75.1200
shall include the following:
(a) Name and address of the mine;
(b) The scale and orientation of the
map;
(c) The property or boundary lines of
the mine;
(d) All drill holes that penetrate the
coalbed being mined;
624
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00634
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1202–1
(e) All shaft, slope, drift, and tunnel
openings and auger and strip mined
areas of the coalbed being mined;
(f) The location of all surface mine
ventilation fans; the location may be
designated on the mine map by symbols;
(g) The location of railroad tracks
and public highways leading to the
mine, and mine buildings of a permanent nature with identifying names
shown;
(h) The location and description of at
least two permanent base line points
coordinated with the underground and
surface mine traverses, and the location and description of at least two
permanent elevation bench marks used
in connection with establishing or referencing mine elevation surveys;
(i) The location of any body of water
dammed in the mine or held back in
any portion of the mine; provided, however, such bodies of water may be
shown on overlays or tracings attached
to the mine maps used to show contour
lines as provided under paragraph (m)
of this section;
(j) The elevations of tops and bottoms of shafts and slopes, and the floor
at the entrance to drift and tunnel
openings;
(k) The elevation of the floor at intervals of not more than 200 feet in:
(1) At least one entry of each working section, and main and cross entries;
(2) The last line of open crosscuts of
each working section, and main and
cross entries before such sections and
main and cross entries are abandoned;
(3) Rooms advancing toward or adjacent to property or boundary lines or
adjacent mines;
(l) The elevation of any body of water
dammed in the mine or held back in
any portion of the mine; and,
(m) Contour lines passing through
whole number elevations of the coalbed
being mined. The spacing of such lines
shall not exceed 10-foot elevation levels, except that a broader spacing of
contour lines may be approved by the
District Manager for steeply-pitching
coalbeds. Contour lines may be placed
on overlays or tracings attached to
mine maps.
(n) The locations of refuge alternatives.
[35 FR 17890, Nov. 20, 1970, as amended at 73
FR 80697, Dec. 31, 2008]
§ 75.1200–2
maps.
Accuracy and scale of mine
(a) The scale of mine maps submitted
to the Secretary shall not be less than
100 or more than 500 feet to the inch.
(b) Mine traverses shall be advanced
by closed loop methods of traversing or
other equally accurate methods of traversing.
§ 75.1201
Certification.
[STATUTORY PROVISIONS]
Such map shall be made or certified
by a registered engineer or a registered
surveyor of the State in which the
mine is located.
§ 75.1202 Temporary notations,
sions, and supplements.
[STATUTORY PROVISIONS]
Such map shall be kept up-to-date by
temporary notations and such map
shall be revised and supplemented at
intervals prescribed by the Secretary
on the basis of a survey made or certified by such engineer or surveyor.
§ 75.1202–1 Temporary notations, revisions, and supplements.
(a) Mine maps shall be revised and
supplemented at intervals of not more
than 6 months.
(b) Temporary notations shall include:
(1) The location of each working face
of each working place;
(2) Pillars mined or other such second
mining;
(3) Permanent ventilation controls
constructed or removed, such as seals,
overcasts, undercasts, regulators, and
permanent stoppings, and the direction
of air currents indicated;
(4) Escapeways and refuge alternatives designated by means of symbols.
[35 FR 17890, Nov. 20, 1970, as amended at 73
FR 80697, Dec. 31, 2008]
625
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00635
Fmt 8010
revi-
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1203
§ 75.1203
30 CFR Ch. I (7–1–19 Edition)
the Coal Mine Safety and Health District Office for the district in which the
mine is located.
Availability of mine map.
[STATUTORY PROVISIONS]
The coal mine map and any revision
and supplement thereof shall be available for inspection by the Secretary or
his authorized representative, by coal
mine inspectors of the State in which
the mine is located, by miners in the
mine and their representatives and by
operators of adjacent coal mines and
by persons owning, leasing, or residing
on surface areas of such mines or areas
adjacent to such mines. The operator
shall furnish to the Secretary or his
authorized representative and to the
Secretary of Housing and Urban Development, upon request, one or more copies of such maps and any revision and
supplement thereof. Such map or revision and supplement thereof shall be
kept confidential and its contents shall
not be divulged to any other person,
except to the extent necessary to carry
out the provisions of this Act and in
connection with the functions and responsibilities of the Secretary of Housing and Urban Development.
§ 75.1204 Mine closure; filing of map
with Secretary.
[STATUTORY PROVISIONS]
Whenever an operator permanently
closes or abandons a coal mine, or temporarily closes a coal mine for a period
of more than 90 days, he shall promptly
notify the Secretary of such closure.
Within 60 days of the permanent closure or abandonment of the mine, or,
when the mine is temporarily closed,
upon the expiration of a period of 90
days from the date of closure, the operator shall file with the Secretary a
copy of the mine map revised and supplemented to the date of the closure.
Such copy of the mine map shall be
certified by a registered surveyor or
registered engineer of the State in
which the mine is located and shall be
available for public inspection.
kpayne on VMOFRWIN702 with $$_JOB
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1204–1 Places to give notice and
file maps.
Operators shall give notice of mine
closures and file copies of maps with
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995; 71 FR 16669, Apr. 3,
2006]
Subpart N—Explosives and
Blasting
SOURCE: 53 FR 46786, Nov. 18, 1988, unless
otherwise noted.
§ 75.1300 Definitions.
The following definitions apply in
this subpart.
Approval. A document issued by
MSHA which states that an explosive
or explosive unit has met the requirements of this part and which authorizes an approval marking identifying
the explosive or explosive unit as approved as permissible.
Battery
starting.
The
use
of
unconfined explosives to start the flow
of coal down a breast or chute in an anthracite mine.
Blasting off the solid. Blasting the
working face without providing a second free face by cutting, shearing or
other method before blasting.
Instantaneous detonator. An electric
detonator that fires within 6 milliseconds after application of the firing
current.
Laminated partition. A partition composed of the following material and
minimum nominal dimensions: 1⁄2-inch
thick plywood, 1⁄2-inch thick gypsum
wall board, 1⁄8-inch thick low carbon
steel and 1⁄4-inch thick plywood, bonded
together in that order.
Opener hole. The first hole or holes
fired in a round blasted off the solid to
create an additional free face.
Permissible blasting unit. A device that
has been approved by MSHA and that
is used for firing electric detonators.
Permissible explosive. Any substance,
compound or mixture which is approved by MSHA and whose primary
purpose is to function by explosion.
Round. A group of boreholes fired or
intended to be fired in a continuous sequence with one application of the firing current.
Sheathed explosive unit. A device consisting of an approved or permissible
explosive covered by a sheath encased
626
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00636
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1311
in a sealed covering and designed to be
fired outside the confines of a borehole.
Short-delay electric detonator. An electric detonator with a designated delay
period of 25 to 1,000 milliseconds.
detonators and long period delay detonators for anthracite mines.
(d)
Permissible
explosives
and
sheathed explosive units shall not be
used underground when they are below
the minimum product firing temperature specified by the approval. Explosives previously approved which do not
specify a minimum firing temperature
are permissible for use so long as the
present approval is maintained.
(e) Electric detonators shall be compatible with the blasting unit and have
sufficient strength to initiate the explosives being used.
§ 75.1301 Qualified person.
(a) A qualified person under this subpart is a person who—
(1) Is certified or qualified to use explosives by the State in which the mine
is located provided that the State requires a demonstration of ability to
safely use permissible explosives as
prescribed by this subpart effective
January 17, 1989; or
(2) In States that do not certify or
qualify persons to use explosives required by this section, has at least 1
year of experience working in an underground coal mine that includes direct involvement with procedures for
handling, loading, and preparing explosives for blasting and demonstrates to
an authorized representative of the
Secretary the ability to use permissible explosives safely.
(b) Persons qualified or certified by a
State to use permissible explosives in
underground coal mines as of May 17,
1989, are considered qualified under this
section even though their State program did not contain a demonstration
of ability requirement.
kpayne on VMOFRWIN702 with $$_JOB
[35 FR 17890, Nov. 20, 1970, as amended at 56
FR 51616, Oct. 11, 1991; 60 FR 33723, June 29,
1995]
§ 75.1310 Explosives
and
blasting
equipment.
(a) Only permissible explosives, approved sheathed explosive units, and
permissible blasting units shall be
taken or used underground.
(b) Black blasting powder, aluminum-cased detonators, aluminumalloy-cased
detonators,
detonators
with aluminum leg wires, and safety
fuses shall not be taken or used underground.
(c) Explosives shall be fired only with
a permissible blasting unit used in a
manner consistent with its approval.
Blasting units approved by MSHA that
have approval labels specifying use
with short-delay detonators with delay
periods between 25–500 milliseconds are
accepted to fire short-delay detonators
up to 1,000 milliseconds, instantaneous
§ 75.1311 Transporting explosives and
detonators.
(a) When explosives and detonators
are to be transported underground—
(1) They shall be enclosed in separate, substantially constructed containers made of nonconductive material, with no metal or other conductive
materials exposed inside, except as
specified in paragraph (d) of this section; and
(2) Each container of explosives and
of detonators shall be indelibly marked
with a readily visible warning identifying the contents.
(b) When explosives and detonators
are transported by any cars or vehicles—
(1) The cars or vehicles shall be
marked with warnings to identify the
contents as explosive. The warnings
shall be readily visible to miners approaching from any direction and in indelible letters;
(2) Explosives and detonators shall be
transported either in separate cars or
vehicles, or if in the same cars or vehicles as follows:
(i) Class A and Class C detonators in
quantities greater than 1,000 shall be
kept in the original containers as
shipped from the manufacturer and
separated from explosives by a hardwood partition at least 4 inches thick,
a laminated partition or equivalent;
and
(ii) Class A and Class C detonators in
quantities of no more than 1,000 shall
be separated from explosives by a hardwood partition at least 4 inches thick,
a laminated partition or equivalent.
(3) No persons, other than those necessary to operate the equipment or to
627
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00637
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1312
30 CFR Ch. I (7–1–19 Edition)
accompany the explosives and detonators, shall be transported with explosives and detonators, and
(4) When explosives and detonators
are transported using trolley locomotives—
(i) Trips carrying explosives and detonators shall be separated from all
other mantrips by at least a 5-minute
interval; and
(ii) Cars containing explosives or detonators shall be separated from the locomotives by at least one car that is
empty or that contains noncombustible
materials.
(c) When explosives and detonators
are transported on conveyor belts—
(1) Containers of explosives shall be
separated from containers of detonators by at least 50 feet;
(2) At least 6 inches of clearance shall
be maintained between the top of any
container of explosives or container of
detonators and the mine roof or other
obstruction;
(3) Except when persons are riding
the belt to accompany explosives or
detonators, a person shall be at each
transfer point between belts and at the
unloading location; and
(4) Conveyor belts shall be stopped
before explosives or detonators are
loaded or unloaded.
(d) When explosives and detonators
are transported by hand they shall be
carried in separate, nonconductive,
closed containers.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1312 Explosives and detonators in
underground magazines.
(a) The quantity of explosives kept
underground shall not be more than is
needed for 48 hours of use.
(b) Except as provided in § 75.1313, explosives and detonators taken underground shall be kept in—
(1) Separate, closed magazines at
least 5 feet apart; or
(2) The same closed magazine when—
(i) Separated by a hardwood partition
at least 4 inches thick; or
(ii) Separated by a laminated partition; or
(iii) Separated by a device that is
equivalent.
(c) Only explosives and detonators
shall be kept in underground magazines.
(d) Magazines shall be substantially
constructed and all interior surfaces
shall be made of nonconductive material, with no metal or other conductive
material exposed inside.
(e) All magazines shall be—
(1) Located at least 25 feet from roadways and any source of electric current;
(2) Located out of the direct line of
the forces from blasting; and
(3) Kept as dry as practicable.
(f) Magazine locations shall be posted
with indelibly marked and readily visible warnings indicating the presence of
explosives.
(g) Only materials and equipment to
be used in blasting shall be stored at
magazine locations.
§ 75.1313 Explosives and detonators
outside of magazines.
(a) The quantity of explosives outside
a magazine for use in a working section
or other area where blasting is to be
performed shall—
(1) Not exceed 100 pounds; or
(2) Not exceed the amount necessary
to blast one round when more than 100
pounds of explosives is required.
(b) Explosives and detonators outside
a magazine that are not being transported
or
prepared
for
loading
boreholes shall be kept in closed separate containers made of nonconductive
material with no metal or other conductive material exposed inside and
the containers shall be—
(1) At least 15 feet from any source of
electric current;
(2) Out of the direct line of the forces
from blasting;
(3) In a location to prevent damage
by mobile equipment; and
(4) Kept as dry as practicable.
(c) Explosives and detonators not
used during the shift shall be returned
to a magazine by the end of the shift.
§ 75.1314 Sheathed explosive units.
(a) A separate instantaneous detonator shall be used to fire each
sheathed explosive unit.
(b) Sheathed explosive units shall be
primed and placed in position for firing
only by a qualified person or a person
working in the presence of and under
the direction of a qualified person. To
prime a sheathed explosive unit, the
628
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00638
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1317
entire detonator shall be inserted into
the detonator well of the unit and be
held securely in place.
(c) Sheathed explosive units shall not
be primed until immediately before the
units are placed where they are to be
fired. A sheathed explosive unit shall
not be primed if it is damaged or deteriorated.
(d) Except in anthracite mines, rock
dust shall be applied to the roof, ribs
and floor within a 40–foot radius of the
location where the sheathed explosive
units are to be fired.
(e) No more than three sheathed explosive units shall be fired at one time.
(f) No sheathed explosive unit shall
be fired in contact with another
sheathed explosive unit.
be placed and fired shall be deenergized
or removed to at least 50 feet from
these locations before priming of explosives. Battery-powered equipment shall
be removed to at least 50 feet from
these locations before priming of explosives.
(2) As an alternative to paragraph
(a)(1) of this section, electric equipment, including cables, need not be deenergized or removed if located at least
25 feet from these locations provided
stray current tests conducted prior to
priming the explosives detect stray
currents of 0.05 ampere or less through
a 1-ohm resistor.
(i) Tests shall be made at floor locations on the perimeter, on energized
equipment frames and on repaired
areas of energized cables within the
area between 25 to 50 feet from the locations where the explosives are to be
primed.
(ii) Tests shall be conducted using a
blasting multimeter or other instrument specifically designed for such use.
(3) The blasting cable or detonator
circuitry shall not come in contact
with energized electric equipment, including cables.
(b) Before loading boreholes with explosives, each borehole shall be cleared
and its depth and direction determined.
(c) No borehole drilled beyond the
depth of cut coal shall be loaded with
explosives unless that portion of the
borehole deeper than the cut is tamped
with noncombustible material.
(d) When two working faces are approaching each other, cutting, drilling
and blasting shall be done at only one
working face at a time if the two faces
are within 25 feet of each other.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1315 Boreholes for explosives.
(a) All explosives fired underground
shall be confined in boreholes except—
(1) Sheathed explosives units and
other explosive units approved by
MSHA for firing outside the confines of
a borehole; and
(2) Shots fired in anthracite mines
for battery starting or for blasting coal
overhangs. No person shall go inside a
battery to start the flow of material.
(b) Each borehole in coal for explosives shall be at least 24 inches from
any other borehole and from any free
face, unless prohibited by the thickness
of the coal seam.
(c) Each borehole in rock for explosives shall be at least 18 inches from
any other borehole in rock, at least 24
inches from any other borehole in coal,
and at least 18 inches from any free
face.
(d) No borehole that has contained
explosives shall be used for starting
any other hole.
(e) When blasting slab rounds off the
solid, opener holes shall not be drilled
beyond the rib line.
(f) When coal is cut for blasting, the
coal shall be supported if necessary to
maintain the stability of the column of
explosives in each borehole.
§ 75.1316 Preparation before blasting.
(a)(1) All nonbattery-powered electric
equipment, including cables, located
within 50 feet from boreholes to be
loaded with explosives or the sites
where sheathed explosive units are to
[35 FR 17890, Nov. 20, 1970, as amended at 56
FR 51616, Oct. 11, 1991]
§ 75.1317
Primer cartridges.
(a) Primer cartridges shall be primed
and loaded only by a qualified person
or a person working in the presence of
and under the direction of a qualified
person.
(b) Primer cartridges shall not be
primed until immediately before loading boreholes.
(c) Only a nonsparking punch shall be
used when priming explosive cartridges.
629
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00639
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1318
30 CFR Ch. I (7–1–19 Edition)
(d) Detonators shall be completely
within and parallel to the length of the
cartridge and shall be secured by halfhitching the leg wires around the cartridge or secured by an equally effective method.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1318
Loading boreholes.
(a) Explosives shall be loaded by a
qualified person or a person working in
the presence of and under the direction
of a qualified person.
(b) When boreholes are being loaded,
no other work except that necessary to
protect persons shall be done in the
working place or other area where
blasting is to be performed.
(c) When loading boreholes drilled at
an angle of 45 degrees or greater from
the horizontal in solid rock or loading
long holes drilled upward in anthracite
mines—
(1) The first cartridge in each borehole shall be the primer cartridge with
the end of the cartridge containing the
detonator facing the back of the borehole; and
(2) The explosive cartridges shall be
loaded in a manner that provides contact between each cartridge in the
borehole.
(d) When loading other boreholes—
(1) The primer cartridge shall be the
first cartridge loaded in the borehole;
(2) The end of the cartridge in which
the detonator is inserted shall face the
back of the borehole; and
(3) The primer cartridge and other
explosives shall be pushed to the back
of the borehole in a continuous column
with no cartridge being deliberately
crushed or deformed.
(e) An explosive shall not be loaded
into a borehole if it is damaged, deteriorated or if the cartridge is incompletely filled.
(f) Explosives of different brands,
types or cartridge diameters shall not
be loaded in the same borehole.
(g) Only nonconductive, nonsparking
tamping poles shall be used for loading
and tamping boreholes. The use of nonsparking connecting devices for extendable tamping poles is permitted.
[53 FR 46786, Nov. 18, 1988; 54 FR 888, Jan. 10,
1989]
§ 75.1319 Weight of explosives permitted in boreholes in bituminous
and lignite mines.
(a) The total weight of explosives
loaded in any borehole in bituminous
and lignite mines shall not exceed 3
pounds except when blasting solid rock
in its natural deposit.
(b) The total weight of explosives
loaded in a borehole less than 6 feet
deep in bituminous and lignite mines
shall be reduced by 1⁄2 pound for each
foot of borehole less than 6 feet.
§ 75.1320 Multiple-shot blasting.
(a) No more than 20 boreholes shall
be fired in a round unless permitted in
writing by the District Manager under
§ 75.1321.
(b) Instantaneous detonators shall
not be used in the same circuit with
delay detonators in any underground
coal mine.
(c) In bituminous and lignite mines,
only detonators with delay periods of
1,000 milliseconds or less shall be used.
(d) When blasting in anthracite
mines, each borehole in a round shall
be initiated in sequence from the opener hole or holes.
(e) Arrangement of detonator delay
periods for bituminous and lignite
mines shall be as follows:
(1) When blasting cut coal—
(i) The first shot or shots fired in a
round shall be initiated in the row
nearest the kerf or the row or rows
nearest the shear; and
(ii) After the first shot or shots, the
interval between the designated delay
periods of successive shots shall be at
least 50 milliseconds but not more than
100 milliseconds.
(2) When blasting coal off the solid—
(i) Each shot in the round shall be
initiated in sequence from the opener
hole or holes; and
(ii) After the first shot or shots, the
interval between the designated delay
periods of successive shots shall be at
least 50 milliseconds but not more than
100 milliseconds.
§ 75.1321 Permits for firing more than
20 boreholes and for use of nonpermissible blasting units.
(a) Applications for permits for firing
more than 20 boreholes in a round and
for the use of nonpermissible blasting
630
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00640
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1323
units shall be submitted in writing to
the District Manager for the district in
which the mine is located and shall
contain the following information:
(1) The name and address of the mine;
(2) The active workings in the mine
affected by the permit and the approximate number of boreholes to be fired;
(3) The period of time during which
the permit will apply;
(4) The nature of the development or
construction for which they will be
used, e.g., overcasts, undercasts, track
grading, roof brushing or boom holes;
(5) A plan, proposed by the operator
designed to protect miners in the mine
from the hazards of methane and other
explosive gases during each multiple
shot, e.g., changes in the mine ventilation system, provisions for auxiliary
ventilation and any other safeguards
necessary to minimize such hazards;
(6) A statement of the specific hazards anticipated by the operator in
blasting for overcasts, undercasts,
track grading, brushing of roof, boom
holes or other unusual blasting situations such as coalbeds of abnormal
thickness; and
(7) The method to be employed to
avoid the dangers anticipated during
development or construction which
will ensure the protection of life and
the prevention of injuries to the miners
exposed to such underground blasting.
(b) The District Manager may permit
the firing of more than 20 boreholes of
permissible explosives in a round where
he has determined that it is necessary
to reduce the overall hazard to which
miners are exposed during underground
blasting. He may also permit the use of
nonpermissible blasting units if he
finds that a permissible blasting unit
does not have adequate blasting capacity and that the use of such permissible
units will create any of the following
development or construction hazards:
(1) Exposure to disturbed roof in an
adjacent cavity while scaling and supporting the remaining roof prior to
wiring a new series of boreholes;
(2)
Exposure
to
underburden
boreholes where prior rounds have removed the burden adjacent to a remaining borehole;
(3) Exposure to an unsupported roof
while redrilling large fragmented roof
rock following the loss of predrilled
boreholes during earlier blasting operations; or
(4) Any other hazard created by the
use of permissible blasting units during
underground development or construction.
(c) Permits shall be issued on a mineby-mine basis for periods of time to be
specified by the District Manager.
(d) Permits issued under this section
shall specify and include as a condition
of their use, any safeguards, in addition to those proposed by the operator,
which the District Manager issuing
such permit has determined will be required to ensure the welfare of the
miners employed in the mine at the
time of the blasting permitted.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1322
Stemming boreholes.
(a) Only noncombustible material
shall be used for stemming boreholes.
(b) Stemming materials other than
water stemming bags shall be tamped
to fill the entire cross sectional area of
the borehole.
(c) Stemming material shall contact
the explosive cartridge nearest the collar of the borehole.
(d) Each borehole 4 or more feet deep
shall be stemmed for at least 24 inches.
(e) Each borehole less than 4 feet
deep shall be stemmed for at least half
the depth of the borehole.
(f) When blasting off the solid in bituminous and lignite mines, only pliable
clay dummies shall be used for stemming.
(g) The diameter of a water stemming bag shall be within 1⁄4 of an inch
of the diameter of the drill bit used to
drill the borehole.
(h) Water stemming bags shall be
constructed
of
tear-resistant
and
flame-resistant material and be capable of withstanding a 3-foot drop when
filled without rupturing or developing
leaks.
§ 75.1323
Blasting circuits.
(a) Blasting circuits shall be protected from sources of stray electric
current.
(b) Detonators made by different
manufacturers shall not be combined
in the same blasting circuit.
631
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00641
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1324
30 CFR Ch. I (7–1–19 Edition)
(c) Detonator leg wires shall be
shunted until connected into the blasting circuit.
(d) Blasting cables shall be—
(1) Well insulated, copper wire of a
diameter not smaller than 18-gauge;
and
(2) Long enough to permit the round
to be fired from a safe location that is
around at least one corner from the
blasting area.
(e) Blasting cables shall be shunted
until immediately before firing, except
when testing for circuit continuity.
(f) Wire used between the blasting
cable and detonator circuitry shall—
(1) Be undamaged;
(2) Be well insulated;
(3) Have a resistance no greater than
20-gauge copper wire; and
(4) Be not more than 30 feet long.
(g) Each wire connection in a blasting circuit shall be—
(1) Properly spliced; and
(2) Separated from other connections
in the circuit to prevent accidental
contact and arcing.
(h) Uninsulated connections in each
blasting circuit shall be kept out of
water and shall not contact the coal,
roof, ribs, or floor.
(i) When 20 or fewer boreholes are
fired in a round, the blasting circuit
shall be wired in a single series.
(j) Immediately prior to firing, all
blasting circuits shall be tested for
continuity and resistance using a
blasting galvanometer or other instrument specifically designed for testing
blasting circuits.
[53 FR 46786, Nov. 18, 1988; 54 FR 27641, June
30, 1989]
§ 75.1324 Methane concentration and
tests.
kpayne on VMOFRWIN702 with $$_JOB
(a) No shot shall be fired in an area
that contains 1.0 volume percent or
more of methane.
(b) Immediately before shots are
fired, the methane concentration in a
working place or any other area where
blasting is to be performed, shall be determined by a person qualified to test
for methane.
§ 75.1325
Firing procedures.
(a) Shots shall be fired by a qualified
person or a person working in the pres-
ence of and under the direction of a
qualified person.
(b) Only one face in a working place
shall be blasted at a time, except that
when blasting cut coal up to three
faces may be blasted in a round if each
face has a separate kerf and no more
than a total of 20 shots connected in a
single series are fired in the round. A
permit to fire more than 20 boreholes
in a round under the provisions of 30
CFR 75.1320 and 75.1321 may not be obtained for use when blasting multiple
faces.
(c) Before blasting—
(1) All persons shall leave the blasting area and each immediately adjacent working place where a hazard
would be created by the blast, to an
area that is around at least one corner
from the blasting area;
(2) The qualified person shall ascertain that all persons are a safe distance
from the blasting area; and
(3) A warning shall be given and adequate time allowed for persons to respond.
(d) All shots shall be fired promptly,
after all persons have been removed to
a safe location.
[35 FR 17890, Nov. 20, 1970, as amended at 56
FR 51616, Oct. 11, 1991]
§ 75.1326
Examination after blasting.
(a) After blasting, the blasting area
shall not be entered until it is clear of
smoke and dust.
(b) Immediately after the blasting
area has cleared, a qualified person or
a person working in the presence of and
under the direction of a qualified person, shall examine the area for misfires, methane and other hazardous
conditions.
(c) If a round has partially detonated,
the qualified person shall immediately
leave the area and no person shall reenter the affected area for at least 5 minutes.
§ 75.1327
Misfires.
(a) When misfires occur, only work
by a qualified person to dispose of misfires and other work necessary to protect persons shall be done in the affected area.
(b) When a misfire cannot be disposed
of—
632
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00642
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1400–4
(1) A qualified person shall post each
accessible entrance to the area affected
by the hazard of the misfire with a
warning at a conspicuous location to
prohibit entry; and
(2) The misfire shall be immediately
reported to mine management.
quired for automatically operated
cages, platforms, or elevators.
[53 FR 46786, Nov. 18, 1988; 54 FR 27641, June
30, 1989]
§ 75.1328 Damaged or deteriorated explosives and detonators.
(a) Damaged explosives or detonators
shall be—
(1) Placed in separate containers constructed of nonconductive and nonsparking materials; and
(2) Removed from the mine or placed
in a magazine and removed when the
magazine is resupplied.
(b) Damaged detonators shall be
shunted, if practicable, either before
being removed from the mine or placed
in a magazine.
(c) Deteriorated explosives and detonators shall be handled and disposed of
in accordance with the instructions of
the manufacturer.
Subpart O—Hoisting and Mantrips
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1400
Hoisting equipment; general.
(a) Every hoist used to transport persons shall be equipped with overspeed,
overwind, and automatic stop controls.
(b) Every hoist handling a platform,
cage, or other device used to transport
persons shall be equipped with brakes
capable of stopping the fully loaded
platform, cage, or other device.
(c) Cages, platforms, or other devices
used to transport persons in shafts and
slopes shall be equipped with safety
catches or other no less effective devices approved by the Secretary that
act quickly and effectively in an emergency. Such catches or devices shall be
tested at least once every two months.
(d) Hoisting equipment, including
automatic elevators, used to transport
persons shall be examined daily.
(e) Where persons are transported
into or out of a mine by a hoist, a
qualified hoisting engineer shall be on
duty while any person is underground.
No such engineer, however, shall be re-
[48 FR 53239, Nov. 25, 1983]
§ 75.1400–1 Hoists; brakes, capability.
Brakes on hoists used to transport
persons shall be capable of stopping
and holding the fully loaded platform,
cage, or other device at any point in
the shaft, slope, or incline.
§ 75.1400–2 Hoists; tests of safety
catches; records.
A record shall be made in a book of
the tests, required by § 75.1400, of the
safety catches or other devices approved by the Secretary. Each entry
shall be signed by the person making
the tests and countersigned by a responsible official.
§ 75.1400–3 Daily examination of hoisting equipment.
Hoists and elevators shall be examined daily and such examinations shall
include, but not be limited to, the following:
(a) Elevators. A visual examination of
the rope for wear, broken wires, and
corrosion, especially at excessive
strain points such as near the attachments and where the rope rests on
sheaves;
(b) Hoists and elevators. (1) An examination of the rope fastenings for defects;
(2) An examination of safety catches;
(3) An examination of the cages, platforms, elevators, or other devices for
loose, missing or defective parts;
(4) An examination of the head
sheaves to check for broken flanges,
defective bearings, rope alignment, and
proper lubrication; and
(5) An observation of the lining and
all other equipment and appurtenances
installed in the shaft.
[48 FR 53239, Nov. 25, 1983]
§ 75.1400–4 Certifications and records
of daily examinations.
At the completion of each daily examination required by § 75.1400, the person making the examination shall certify, by signature and date, that the
examination has been made. If any unsafe condition is found during the examinations required by § 75.1400–3, the
633
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00643
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1401
30 CFR Ch. I (7–1–19 Edition)
person conducting the examination
shall make a record of the condition
and the date. Certifications and records
shall be retained for one year.
[48 FR 53239, Nov. 25, 1983, as amended at 60
FR 33723, June 29, 1995]
§ 75.1401 Hoists; rated capacities; indicators.
Hoists shall have rated capacities
consistent with the loads handled. An
accurate and reliable indicator of the
position of the cage, platform, skip,
bucket, or cars shall be provided.
[48 FR 53239, Nov. 25, 1983]
§ 75.1401–1
Hoists; indicators.
The indicator required by § 75.1401 of
this subpart shall be placed so that it
is in clear view of the hoisting engineer
and shall be checked daily to determine its accuracy.
[48 FR 53239, Nov. 25, 1983]
§ 75.1402 Communication
between
shaft stations and hoist room.
[STATUTORY PROVISIONS]
There shall be at least two effective
methods approved by the Secretary of
signaling between each of the shaft stations and the hoist room, one of which
shall be a telephone or speaking tube.
§ 75.1402–1 Communication
between
shaft stations and hoist room.
One of the methods used to communicate between shaft stations and the
hoist room shall give signals which can
be heard by the hoisting engineer at all
times while men are underground.
§ 75.1402–2
Tests of signaling systems.
Signaling systems used for communication between shaft stations and the
hoist room shall be tested daily.
§ 75.1403
Other safeguards.
kpayne on VMOFRWIN702 with $$_JOB
[STATUTORY PROVISIONS]
Other safeguards adequate, in the
judgment of an authorized representative of the Secretary, to minimize hazards with respect to transportation of
men and materials shall be provided.
§ 75.1403–1 General criteria.
(a) Sections 75.1403–2 through 75.1403–
11 set out the criteria by which an authorized representative of the Secretary will be guided in requiring other
safeguards on a mine-by-mine basis
under § 75.1403. Other safeguards may
be required.
(b) The authorized representative of
the Secretary shall in writing advise
the operator of a specific safeguard
which is required pursuant to § 75.1403
and shall fix a time in which the operator shall provide and thereafter maintain such safeguard. If the safeguard is
not provided within the time fixed and
if it is not maintained thereafter, a notice shall be issued to the operator pursuant to section 104 of the Act.
(c) Nothing in the sections in the
§ 75.1403 series in this Subpart O precludes the issuance of a withdrawal
order because of imminent danger.
§ 75.1403–2 Criteria—Hoists
transporting materials; brakes.
Hoists and elevators used to transport materials should be equipped with
brakes capable of stopping and holding
the fully loaded platform, cage, skip,
car, or other device at any point in the
shaft, slope, or incline.
§ 75.1403–3 Criteria—Drum
clutch;
cage construction.
(a) The clutch of a free-drum on a
personnel hoist should be provided with
a locking mechanism or interlocked
with the brake to prevent accidental
withdrawal of the clutch.
(b) Cages used for hoisting persons
should be constructed with the sides
enclosed to a height of at least six feet
and should have gates, safety chains,
or bars across the ends of the cage
when persons are being hoisted or lowered.
(c) Self-dumping cages, platforms, or
other devices used for transportation of
persons should have a locking device to
prevent tilting when persons are transported.
(d) An attendant should be on duty at
the surface when persons are being
hoisted or lowered at the beginning and
end of each shift.
(e) Precautions should be taken to
protect persons working in shaft
sumps.
634
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00644
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1403–6
(f) Workers should wear safety belts
while doing work in or over shafts.
be installed at all loading and unloading stations. Such colored lights and
reflective signs should be so located as
to be observable to all persons riding
the belt conveyor.
(f) After supplies have been transported on belt conveyors such belts
should be examined for unsafe conditions prior to the transportation of
men on regularly scheduled mantrips,
and belt conveyors should be clear before men are transported.
(g) A clear travelway at least 24
inches wide should be provided on both
sides of all belt conveyors installed
after March 30, 1970. Where roof supports are installed within 24 inches of a
belt conveyor, a clear travelway at
least 24 inches wide should be provided
on the side of such support farthest
from the conveyor.
(h) On belt conveyors that do not
transport men, stop and start controls
should be installed at intervals not to
exceed 1,000 feet. Such controls should
be properly installed and positioned so
as to be readily accessible.
(i) Telephone or other suitable communications should be provided at
points where men or supplies are regularly loaded on or unloaded from the
belt conveyors.
(j) Persons should not cross moving
belt conveyors, except where suitable
crossing facilities are provided.
[48 FR 53239, Nov. 25, 1983]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1403–4 Criteria—Automatic
elevators.
(a) The doors of automatic elevators
should be equipped with interlocking
switches so arranged that the elevator
car will be immovable while any door
is opened or unlocked, and arranged so
that such door or doors cannot be inadvertently opened when the elevator car
is not at a landing.
(b) A ‘‘Stop’’ switch should be provided in the automatic elevator compartment that will permit the elevator
to be stopped at any location in the
shaft.
(c) A slack cable device should be
used where appropriate on automatic
elevators which will automatically
shut-off the power and apply the
brakes in the event the elevator is obstructed while descending.
(d) Each automatic elevator should
be provided with a telephone or other
effective communication system by
which aid or assistance can be obtained
promptly.
§ 75.1403–5 Criteria—Belt conveyors.
(a) Positive-acting stop controls
should be installed along all belt conveyors used to transport men, and such
controls should be readily accessible
and maintained so that the belt can be
stopped or started at any location.
(b) Belt conveyors used for regularly
scheduled mantrips should be stopped
while men are loading or unloading.
(c) All belt conveyors used for the
transportation of persons should have a
minimum vertical clearance of 18
inches from the nearest overhead projection when measured from the edge
of the belt and there should be at least
36 inches of side clearance where men
board or leave such belt conveyors.
(d) When men are being transported
on regularly scheduled mantrips on
belt conveyors the belt speed should
not exceed 300 feet per minute when
the vertical clearance is less than 24
inches, and should not exceed 350 feet
per minute when the vertical clearance
is 24 inches or more.
(e) Adequate illumination including
colored lights or reflective signs should
§ 75.1403–6 Criteria—Self-propelled
personnel carriers.
(a) Each self-propelled personnel carrier should:
(1) Be provided with an audible warning device;
(2) Be provided with a sealed-beam
headlight, or its equivalent, on each
end;
(3) Be provided with reflectors on
both ends and sides.
(b) In addition, each track-mounted
self-propelled personnel carrier should:
(1) Be provided with a suitable lifting
jack and bar, which shall be secured or
carried in a tool compartment;
(2) Be equipped with 2 separate and
independent braking systems properly
installed and well maintained;
(3) Be equipped with properly installed and well-maintained sanding
devices, except that personnel carriers
(jitneys), which transport not more
635
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00645
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1403–7
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
than 5 men, need not be equipped with
such sanding device;
(4) If an open type, be equipped with
guards of sufficient strength and
height to prevent personnel from being
thrown from such carriers.
§ 75.1403–7 Criteria—Mantrips.
(a) Mantrips should be operated independently of any loaded trip, empty
trip, or supply trip and should not be
operated within 300 feet of any trip, including another mantrip.
(b) A sufficient number of mantrip
cars should be provided to prevent
overcrowding of men.
(c) Mantrips should not be pushed.
(d) Where mantrips are operated by
locomotives on slopes such mantrips
should be coupled to the front and rear
by locomotives capable of holding such
mantrips. Where ropes are used on
slopes for mantrip haulage, such conveyances should be connected by
chains, steel ropes, or other effective
devices between mantrip cars and the
rope.
(e) Safety goggles or eyeshields
should be provided for all persons being
transported in open-type mantrips.
(f) All trips, including trailers and
sleds, should be operated at speeds consistent with conditions and the equipment used, and should be so controlled
that they can be stopped within the
limits of visibility.
(g) All mantrips should be under the
direction of a supervisor and the operator of each mantrip should be familiar
with the haulage safety rules and regulations.
(h) Men should proceed in an orderly
manner to and from mantrips and no
person should be permitted to get on or
off a moving mantrip.
(i) [Reserved]
(j) Mantrips should not be permitted
to proceed until the operator of the
mantrip is assured that he has a clear
road.
(k) Supplies or tools, except small
hand tools or instruments, should not
be transported with men.
(l) At places where men enter or
leave mantrip conveyances, ample
clearance should be provided and provisions made to prevent persons from
coming in contact with energized electric circuits.
(m) The mine car next to a trolley locomotive should not be used to transport men. Such cars may be used to
transport small tools and supplies.
This is not to be construed as permitting the transportation of large or
bulky supplies such as shuttle car
wheel units, or similar material.
(n) Drop-bottom cars used to transport men should have the bottoms secured with an additional locking device.
(o) Extraneous materials or supplies
should not be transported on top of
equipment; however, materials and
supplies that are necessary for or related to the operation of such equipment may be transported on top of
such equipment if a hazard is not introduced.
[35 FR 17890, Nov. 20, 1970, as amended at 53
FR 46786, Nov. 18, 1988]
§ 75.1403–8
roads.
Criteria—Track
(a) The speed at which haulage equipment is operated should be determined
by the condition of the roadbed, rails,
rail joints, switches, frogs, and other
elements of the track and the type and
condition of the haulage equipment.
(b) Track haulage roads should have
a continuous clearance on one side of
at least 24 inches from the farthest projection of normal traffic. Where it is
necessary to change the side on which
clearance is provided, 24 inches of
clearance should be provided on both
sides for a distance of not less than 100
feet and warning signs should be posted
at such locations.
(c) Track haulage roads developed
after March 30, 1970, should have clearance on the ‘‘tight’’ side of at least 12
inches from the farthest projection of
normal traffic. A minimum clearance
of 6 inches should be maintained on the
‘‘tight’’ side of all track haulage roads
developed prior to March 30, 1970.
(d) The clearance space on all track
haulage roads should be kept free of
loose rock, supplies, and other loose
materials.
(e) Positive stopblocks or derails
should be installed on all tracks near
the top and at landings of shafts,
slopes, and surface inclines.
636
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00646
Fmt 8010
haulage
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1403–11
§ 75.1403–9 Criteria—Shelter holes.
(a) Shelter holes should be provided
on track haulage roads at intervals of
not more than 105 feet unless otherwise
approved by the Coal Mine Safety District Manager(s).
(b) Shelter holes should be readily
accessible and should be at least 5 feet
in depth, not more than 4 feet in width
(except crosscuts used as shelter holes)
and at least the height of the coal seam
where the coal seam is less than 6 feet
high and at least 6 feet in height where
the coal seam is 6 feet or more in
height.
(c) Shelter holes should be kept free
of refuse and other obstructions. Crosscuts used as shelter holes should be
kept free of refuse or other materials
to a depth of at least 15 feet.
(d) Shelter holes should be provided
at all manually operated doors and at
switch throws except: (1) At room
switches, or (2) at switches where more
than 6 feet of side clearance is provided. The Coal Mine Safety District
Manager(s) may permit exemption of
this requirement if such shelter holes
create a hazardous roof condition.
(e) At each underground slope landing where men pass and cars are handled, a shelter hole at least 10 feet in
depth, 4 feet in width, and 6 feet in
height should be provided.
(c) Warning lights or reflective signs
or tapes should be installed along haulage roads at locations of abrupt or sudden changes in the overhead clearance.
(d) No person, other than the motorman and brakeman, should ride on a locomotive unless authorized by the
mine foreman, and then only when safe
riding facilities are provided. No person should ride on any loaded car or on
the bumper of any car. However, the
brakeman may ride on the rear bumper
of the last car of a slow moving trip
pulled by a locomotive.
(e) Positive-acting stopblocks or derails should be used where necessary to
protect persons from danger of runaway haulage equipment.
(f) An audible warning should be
given by the operator of all self-propelled equipment including off-track
equipment, where persons may be endangered by the movement of the
equipment.
(g) Locomotives and personnel carriers should not approach to within 300
feet of preceding haulage equipment,
except trailing locomotives that are an
integral part of the trip.
(h) A total of at least 36 inches of unobstructed side clearance (both sides
combined) should be provided for all
rubber-tired haulage equipment where
such equipment is used.
(i) Off-track haulage roadways should
be maintained as free as practicable
from bottom irregularities, debris, and
wet or muddy conditions that affect
the control of the equipment.
(j) Operators of self-propelled equipment should face in the direction of
travel.
(k) Mechanical steering and control
devices should be maintained so as to
provide positive control at all times.
(l) All self-propelled rubber-tired
haulage equipment should be equipped
with well maintained brakes, lights,
and a warning device.
(m) On and after March 30, 1971, all
tram control switches on rubber-tired
equipment should be designed to provide automatic return to the stop or off
position when released.
§ 75.1403–10 Criteria—Haulage;
general.
(a) A permissible trip light or other
approved device such as reflectors, approved by the Coal Mine Safety District Manager(s), should be used on the
rear of trips pulled, on the front of
trips pushed and on trips lowered in
slopes. However, trip lights or other
approved devices need not be used on
cars being shifted to and from loading
machines, on cars being handled at
loading heads, during gathering operations at working faces, when trailing
locomotives are used, or on trips pulled
by animals.
(b) Cars on main haulage roads
should not be pushed, except where
necessary to push cars from side tracks
located near the working section to the
producing entries and rooms, where
necessary to clear switches and
sidetracks, and on the approach to
cages, slopes, and surface inclines.
§ 75.1403–11 Criteria—Entrances
to
shafts and slopes.
All open entrances to shafts should
be equipped with safety gates at the
637
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00647
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1404
30 CFR Ch. I (7–1–19 Edition)
top and at each landing. Such gates
should be self-closing and should be
kept closed except when the cage is at
such landing.
§ 75.1404 Automatic brakes; speed reduction gear.
[STATUTORY PROVISIONS]
Each locomotive and haulage car
used in an underground coal mine shall
be equipped with automatic brakes,
where space permits. Where space does
not permit automatic brakes, locomotives and haulage cars shall be subject to speed reduction gear, or other
similar devices approved by the Secretary, which are designed to stop the
locomotives and haulage cars with the
proper margin of safety.
§ 75.1404–1
Braking system.
A locomotive equipped with a dual
braking system will be deemed to satisfy the requirements of § 75.1404 for a
train comprised of such locomotive and
haulage cars, provided the locomotive
is operated within the limits of its design capabilities and at speeds consistent with the condition of the haulage road. A trailing locomotive or
equivalent devices should be used on
trains that are operated on ascending
grades.
§ 75.1405
Automatic couplers.
[STATUTORY PROVISIONS]
All haulage equipment acquired by
an operator of a coal mine on or after
March 30, 1971, shall be equipped with
automatic couplers which couple by
impact and uncouple without the necessity of persons going between the
ends of such equipment. All haulage
equipment without automatic couplers
in use in a mine on March 30, 1970, shall
also be so equipped within 4 years after
March 30, 1970.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1405–1 Automatic couplers, haulage equipment.
The requirement of § 75.1405 with respect to automatic couplers applies
only to track haulage cars which are
regularly coupled and uncoupled.
WIRE ROPES
SOURCE: Sections 75.1429 through 75.1438 appear at 48 FR 53239, Nov. 25, 1983, unless otherwise noted.
§ 75.1429 Guide ropes.
If guide ropes are used in shafts for
personnel hoisting applications other
than shaft development, the nominal
strength (manufacturer’s published
catalog strength) of the guide rope at
installation shall meet the minimum
value calculated as follows: Minimum
value = Static Load × 5.0.
§ 75.1430 Wire ropes; scope.
(a) Sections 75.1430 through 75.1438
apply to wire ropes in service used to
hoist—
(1) Persons in shafts or slopes underground; or
(2) Loads in shaft or slope development when persons work below the suspended loads.
(b) These standards do not apply to
wire ropes used for elevators.
§ 75.1431 Minimum rope strength.
At installation, the nominal strength
(manufacturer’s
published
catalog
strength) of wire ropes used for hoisting shall meet the minimum rope
strength values obtained by the following formulas in which ‘‘L’’ equals
the maximum suspended rope length in
feet:
(a) Winding drum ropes (all constructions, including rotation resistant).
For rope lengths less than 3,000 feet:
Minimum
Value
=
Static
Load
(7.0¥0.001L)
For rope lengths 3,000 feet or greater:
Minimum Value = Static Load × 4.0
(b) Friction drum ropes.
For rope lengths less than 4,000 feet:
Minimum Value = Static Load × (7.0 ¥
0.0005L)
For rope lengths 4,000 feet or greater:
Minimum Value = Static Load × 5.0
(c) Tail ropes (balance ropes).
Minimum Value = Weight of Rope × 7.0
[48 FR 53239, Nov. 25, 1983; 48 FR 54975, Dec.
8, 1983]
§ 75.1432 Initial measurement.
After initial rope stretch but before
visible wear occurs, the rope diameter
638
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00648
Fmt 8010
×
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1436
of newly installed wire ropes shall be
measured at least once in every third
interval of active length and the measurements averaged to establish a baseline for subsequent measurements. A
record of the measurements and the
date shall be made by the person taking the measurements. This record
shall be retained until the rope is retired from service.
and records of examinations shall be
retained for one year.
(e) The person making the measurements or nondestructive tests as required by paragraph (c) of this section
shall record the measurements or test
results and the date. This record shall
be retained until the rope is retired
from service.
[48 FR 53239, Nov. 25, 1983, as amended at 60
FR 33723, June 29, 1995]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1433
Examinations.
(a) At least once every fourteen calendar days, each wire rope in service
shall be visually examined along its entire active length for visible structural
damage, corrosion, and improper lubrication or dressing. In addition, visual
examination for wear and broken wires
shall be made at stress points, including the area near attachments, where
the rope rests on sheaves, where the
rope leaves the drum, at drum crossovers, and at change-of-layer regions.
When any visible condition that results
in a reduction of rope strength is
present, the affected portion of the
rope shall be examined on a daily basis.
(b) Before any person is hoisted with
a newly installed wire rope or any wire
rope that has not been examined in the
previous fourteen calendar days, the
wire rope shall be examined in accordance with paragraph (a) of this section.
(c) At least once every six months,
nondestructive tests shall be conducted
of the active length of the rope, or rope
diameter
measurements
shall
be
made—
(1) Wherever wear is evident;
(2) Where the hoist rope rests on
sheaves at regular stopping points;
(3) Where the hoist rope leaves the
drum at regular stopping points; and
(4) At drum crossover and change-oflayer regions.
(d) At the completion of each examination required by paragraph (a) of
this section, the person making the examination shall certify, by signature
and date, that the examination has
been made. If any condition listed in
paragraph (a) of this standard is
present, the person conducting the examination shall make a record of the
condition and the date. Certifications
[48 FR 53239, Nov. 25, 1983, as amended at 60
FR 33723, June 29, 1995]
§ 75.1434 Retirement criteria.
Unless damage or deterioration is removed by cutoff, wire ropes shall be removed from service when any of the
following conditions occurs:
(a) The number of broken wires within a rope lay length, excluding filler
wires, exceeds either—
(1) Five percent of the total number
of wires; or
(2) Fifteen percent of the total number of wires within any strand;
(b) On a regular lay rope, more than
one broken wire in the valley between
strands in one rope lay length;
(c) A loss of more than one-third of
the original diameter of the outer
wires;
(d) Rope deterioriation from corrosion;
(e) Distortion of the rope structure;
(f) Heat damage from any source;
(g) Diameter reduction due to wear
that exceeds six percent of the baseline
diameter measurement; or
(h) Loss of more than ten percent of
rope strength as determined by nondestructive testing.
§ 75.1435 Load end attachments.
(a) Wire rope shall be attached to the
load by a method that develops at least
80 percent of the nominal strength of
the rope.
(b) Except for terminations where use
of other materials is a design feature,
zinc (spelter) shall be used for
socketing wire ropes. Design feature
means either the manufacturer’s original design or a design approved by a
registered professional engineer.
(c) Load end attachment methods
using splices are prohibited.
§ 75.1436 Drum end attachment.
(a) For drum end attachment, wire
rope shall be attached—
639
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00649
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1437
30 CFR Ch. I (7–1–19 Edition)
(1) Securely by clips after making
one full turn around the drum spoke;
(2) Securely by clips after making
one full turn around the shaft, if the
drum is fixed to the shaft; or
(3) By properly assembled anchor
bolts, clamps, or wedges, provided that
the attachment is a design feature of
the hoist drum. Design feature means
either the manufacturer’s original design or a design approved by a registered professional engineer.
(b) A minimum of three full turns of
wire rope shall be on the drum when
the rope is extended to its maximum
working length.
§ 75.1437 End
nation.
attachment
retermi-
Damaged or deteriorated wire rope
shall be removed by cutoff and the rope
reterminated where there is—
(a) More than one broken wire at an
attachment;
(b) Improper installation of an attachment;
(c) Slippage at an attachment; or
(d) Evidence of deterioration from
corrosion at an attachment.
§ 75.1438
End attachment replacement.
Wire rope attachments shall be replaced when cracked, deformed, or excessively worn.
kpayne on VMOFRWIN702 with $$_JOB
Subpart P—Mine Emergencies
§ 75.1500
[Reserved]
§ 75.1501
Emergency evacuations.
(a) For each shift that miners work
underground, there shall be in attendance a responsible person designated by
the mine operator to take charge during mine emergencies involving a fire,
explosion, or gas or water inundation.
(1) The responsible person shall have
current knowledge of the assigned location and expected movements of miners underground, the operation of the
mine ventilation system, the locations
of the mine escapeways and refuge alternatives, the mine communications
system, any mine monitoring system if
used, locations of firefighting equipment, the mine’s Emergency Response
Plan, the Mine Rescue Notification
Plan, and the Mine Emergency Evacu-
ation and Firefighting Program of Instruction.
(2) The responsible person shall be
trained annually in a course of instruction in mine emergency response, as
prescribed by MSHA’s Office of Educational Policy and Development. The
course will include topics such as the
following:
(i) Organizing a command center;
(ii) Coordinating firefighting personnel;
(iii) Deploying firefighting equipment;
(iv) Coordinating mine rescue personnel;
(v) Establishing fresh air base;
(vi) Deploying mine rescue teams;
(vii) Providing for mine gas sampling
and analysis;
(viii) Establishing security;
(ix) Initiating an emergency mine
evacuation;
(x) Contacting emergency personnel;
and
(xi) Communicating appropriate information related to the emergency.
(3) The operator shall certify by signature and date after each responsible
person has completed the training and
keep the certification at the mine for 1
year.
(b) The responsible person shall initiate and conduct an immediate mine
evacuation when there is a mine emergency which presents an imminent
danger to miners due to fire or explosion or gas or water inundation. Only
properly trained and equipped persons
essential to respond to the mine emergency may remain underground.
(c) The mine operator shall instruct
all miners of the identity of the responsible person designated by the operator
for their workshift. The mine operator
shall instruct miners of any change in
the identity of the responsible person
before the start of their workshift.
(d) Nothing in this section shall be
construed to restrict the ability of
other persons in the mine to warn of an
imminent danger which warrants evacuation.
[68 FR 53049, Sept. 9, 2003, as amended at 73
FR 7655, Feb. 8, 2008; 73 FR 80697, Dec. 31,
2008]
640
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00650
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1503
§ 75.1502 Mine emergency evacuation
and firefighting program of instruction.
Each operator of an underground coal
mine shall adopt and follow a mine
emergency evacuation and firefighting
program that instructs all miners in
the proper procedures they must follow
if a mine emergency occurs.
(a) Program approval. The operator
shall submit this program of instruction, and any revisions, for approval to
the District Manager of the Coal Mine
Safety and Health district in which the
mine is located. Within 30 days of approval, the operator shall conduct
training in accordance with the revised
program.
(b) New or revised provisions. Before
implementing any new or revised approved provision in the program of instruction, the operator shall instruct
miners in the change.
(c) Instruction plan. The approved program shall include a specific plan designed to instruct miners on all shifts
on the following:
(1) Procedures for—
(i) Evacuating the mine for mine
emergencies that present an imminent
danger to miners due to fire, explosion,
or gas or water inundation;
(ii) Evacuating all miners not required for a mine emergency response;
and
(iii) The rapid assembly and transportation of necessary miners, fire suppression equipment, and rescue apparatus to the scene of the mine emergency.
(2) The use, care, and maintenance of
self-rescue devices, including hands-on
training in the complete donning and
transferring of all types of self-rescue
devices used at the mine.
(3) The deployment, use, and maintenance of refuge alternatives.
(4) Scenarios requiring a discussion
of options and a decision as to the best
option for evacuation under each of the
various mine emergencies (fires, explosions, or gas or water inundations).
These options shall include:
(i) Encountering conditions in the
mine or circumstances that require immediate donning of self-rescue devices.
(ii) Using continuous directional lifelines or equivalent devices, tethers,
and doors;
(iii)
Traversing
undercasts
or
overcasts;
(iv) Switching escapeways, as applicable;
(v) Negotiating any other unique
escapeway conditions; and
(vi) Using refuge alternatives.
(5) Location and use of the fire suppression and firefighting equipment
and materials available in the mine.
(6) Location of the escapeways, exits,
routes of travel to the surface, including the location of continuous directional lifelines or equivalent devices.
(7) Location, quantity, types, and use
of stored SCSRs, as applicable.
(8) A review of the mine map; the
escapeway system; the escape, firefighting, and emergency evacuation
plan in effect at the mine; and the locations of refuge alternatives and abandoned areas.
(9) A description of how miners will
receive annual expectations training
that includes practical experience in
donning and transferring SCSRs in
smoke, simulated smoke, or an equivalent
environment
and
breathing
through a realistic SCSR training unit
or device that provides the sensation of
SCSR airflow resistance and heat.
(10) A summary of the procedures related to deploying refuge alternatives.
(11) A summary of the construction
methods for 15 psi stoppings constructed prior to an event.
(12) A summary of the procedures related to refuge alternative use.
(d) Instructors. (1) The mine operator
shall designate a person who has the
ability, training, knowledge, or experience to conduct the mine emergency
evacuation instruction and drills in his
or her area of expertise.
(2) Persons conducting SCSR donning
and transferring training shall be able
to effectively train and evaluate
whether miners can successfully don
the SCSR and transfer to additional
SCSR devices.
[71 FR 71452, Dec. 8, 2006, as amended at 73
FR 80697, Dec. 31, 2008]
§ 75.1503 Use
of
equipment.
fire
In addition to the approved program
of instruction required by 30 CFR
641
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00651
Fmt 8010
suppression
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1504
30 CFR Ch. I (7–1–19 Edition)
75.1502, each operator of an underground coal mine shall ensure the following.
(a) Working section. At least two miners in each working section on each
production shift shall be proficient in
the use of all fire suppression equipment available on such working section, and know the location of such fire
suppression equipment.
(b) Attended equipment. Each operator
of attended equipment specified in 30
CFR 75.1107–1(c)(1), and each miner assigned to perform job duties at the job
site in the direct line of sight of attended equipment as described in 30
CFR 75.1107–1(c)(2), shall be proficient
in the use of fire suppression devices
installed on such attended equipment.
(c) Maintenance shift. The shift foreman and at least one miner for every
five miners working underground on a
maintenance shift shall be proficient in
the use of fire suppression equipment
available in the mine, and know the location of such fire suppression equipment.
[71 FR 71452, Dec. 8, 2006]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1504 Mine emergency evacuation
training and drills.
Each operator of an underground coal
mine shall conduct mine emergency
evacuation training and drills and require all miners to participate.
(a) Schedule of training and drills.
Each miner shall participate in a mine
emergency evacuation training and
drill once each quarter. Quarters shall
be based on a calendar year (Jan–Mar,
Apr–Jun, Jul–Sep, Oct–Dec). In addition—
(1) A newly hired miner, who has not
participated in a mine emergency evacuation training and drill at the mine
within the previous 3 months, shall
participate in the next applicable mine
emergency evacuation training and
drill.
(2) Prior to assuming duties on a section or outby work location, a foreman
shall travel both escapeways in their
entirety.
(b) Content of quarterly training and
drill. Each quarterly evacuation training and drill shall include the following:
(1) Hands-on training on all types of
self-rescue devices used at the mine,
which includes—
(i) Instruction and demonstration in
the use, care, and maintenance of selfrescue devices;
(ii) The complete donning of the
SCSR by assuming a donning position,
opening the device, activating the device, inserting the mouthpiece, and
putting on the nose clip; and
(iii) Transferring between all applicable self-rescue devices.
(2) Training that emphasizes the importance of—
(i) Recognizing when the SCSR is not
functioning
properly
and
demonstrating how to initiate and reinitiate the starting sequence;
(ii) Not removing the mouthpiece,
even to communicate, until the miner
reaches fresh air; and
(iii) Proper use of the SCSR by controlling breathing and physical exertion.
(3) A realistic escapeway drill that is
initiated and conducted with a different approved scenario each quarter
and during which each miner—
(i) Travels the primary or alternate
escapeway in its entirety, alternating
escapeways each quarter;
(ii) Physically locates and practices
using the continuous directional lifelines or equivalent devices and tethers,
and physically locates the stored
SCSRs and refuge alternatives;
(iii)
Traverses
undercasts
or
overcasts and doors;
(iv) Switches escapeways, as applicable; and
(v) Negotiates any other unique
escapeway conditions.
(4) A review of the mine and
escapeway maps, the firefighting plan,
and the mine emergency evacuation
plan in effect at the mine, which shall
include:
(i) Informing miners of the locations
of fire doors, check curtains, changes
in the routes of travel, and plans for diverting smoke from escapeways.
(ii) Locating escapeways, exits,
routes of travel to the surface, abandoned areas, and refuge alternatives.
(5) Operation of the fire suppression
equipment available in the mine and
the location and use of firefighting
equipment and materials.
642
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00652
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1506
(6) Reviewing the procedures for deploying refuge alternatives and components.
(7) For miners who will be constructing the 15 psi stoppings prior to
an event, reviewing the procedures for
constructing them.
(8) Reviewing the procedures for use
of the refuge alternatives and components.
(9) Task training in proper transportation of the refuge alternatives and
components.
(c) Annual expectations training. Over
the course of each year, each miner
shall participate in expectations training that includes the following:
(1) Donning and transferring SCSRs
in smoke, simulated smoke, or an
equivalent environment.
(2) Breathing through a realistic
SCSR training unit that provides the
sensation of SCSR airflow resistance
and heat.
(3) Deployment and use of refuge alternatives similar to those in use at
the mine, including—
(i) Deployment and operation of component systems; and
(ii) Instruction on when to use refuge
alternatives during a mine emergency,
emphasizing that it is the last resort
when escape is impossible.
(4) A miner shall participate in expectations training within one quarter
of being employed at the mine.
(d) Certification of training and drills.
At the completion of each training or
drill required in this section, the operator shall certify by signature and date
that the training or drill was held in
accordance with the requirements of
this section.
(1) This certification shall include
the names of the miners participating
in the training or drill. For each miner,
this certification shall list the content
of the training or drill component completed, including the escapeway traveled and scenario used, as required in
paragraphs (b) and (c) of this section.
(2) Certifications shall be kept at the
mine for one year.
(3) Upon request, the certifications
shall be made available to an authorized representative of the Secretary
and the representative of the miners.
(4) Upon request, a copy of the certification that shows his or her own
training shall be provided to the participating miner.
[71 FR 71452, Dec. 8, 2006, as amended at 73
FR 80698, Dec. 31, 2008]
§ 75.1505
Escapeway maps.
(a) Content and accessibility. An
escapeway map shall show the designated escapeways from the working
sections or the miners’ work stations
to the surface or the exits at the bottom of the shaft or slope, refuge alternatives, and SCSR storage locations.
The escapeway map shall be posted or
readily accessible for all miners—
(1) In each working section;
(2) In each area where mechanized
mining equipment is being installed or
removed;
(3) At the refuge alternative; and
(4) At a surface location of the mine
where miners congregate, such as at
the mine bulletin board, bathhouse, or
waiting room.
(b) Keeping maps current. All maps
shall be kept up-to-date and any
change in route of travel, location of
doors, location of refuge alternatives,
or direction of airflow shall be shown
on the maps by the end of the shift on
which the change is made.
(c) Informing affected miners. Miners
underground on a shift when any such
change is made shall be notified immediately of the change and other affected miners shall be informed of the
change before entering the underground areas of the mine.
[71 FR 71452, Dec. 8, 2006, as amended at 73
FR 80698, Dec. 31, 2008]
§ 75.1506
Refuge alternatives.
(a) Each operator shall provide refuge
alternatives and components as follows:
(1)
Prefabricated
self-contained
units, including the structural, breathable air, air monitoring, and harmful
gas removal components of the unit,
shall be approved under 30 CFR part 7;
and
(2) The structural components of
units consisting of 15 psi stoppings constructed prior to an event shall be approved by the District Manager, and
the breathable air, air monitoring, and
harmful gas removal components of
643
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00653
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1506
30 CFR Ch. I (7–1–19 Edition)
these units shall be approved under 30
CFR part 7.
(3) Prefabricated refuge alternative
structures that states have approved
and those that MSHA has accepted in
approved Emergency Response Plans
(ERPs) that are in service prior to
March 2, 2009 are permitted until December 31, 2018, or until replaced,
whichever comes first. Breathable air,
air-monitoring, and harmful gas removal components of either a prefabricated self-contained unit or a unit
consisting of 15 psi stoppings constructed prior to an event in a secure
space and an isolated atmosphere that
states have approved and those that
MSHA has accepted in approved ERPs
that are in use prior to March 2, 2009
are permitted until December 31, 2013,
or until replaced, whichever comes
first. Refuge alternatives consisting of
materials pre-positioned for miners to
deploy in a secure space with an isolated atmosphere that MSHA has accepted in approved ERPs that are in
use prior to March 2, 2009 are permitted
until December 31, 2010, or until replaced, whichever comes first.
(b) Except as permitted under paragraph (a)(3) of this section, each operator shall provide refuge alternatives
with sufficient capacity to accommodate all persons working underground.
(1) Refuge alternatives shall provide
at least 15 square feet of floor space per
person and 30 to 60 cubic feet of volume
per person according to the following
chart. The airlock can be included in
the space and volume if waste is disposed outside the refuge alternative.
Unrestricted volume
(cubic feet) per person*
Mining height (inches)
36 or less ...............................
>36–≤42 .................................
>42–≤48 .................................
>48–≤54 .................................
>54 .........................................
30
37.5
45
52.5
60
kpayne on VMOFRWIN702 with $$_JOB
* Includes an adjustment of 12 inches for clearances.
(2) Refuge alternatives for working
sections shall accommodate the maximum number of persons that can be
expected on or near the section at any
time.
(3) Each refuge alternative for outby
areas shall accommodate persons reasonably expected to use it.
(c) Refuge alternatives shall be provided at the following locations:
(1) Within 1,000 feet from the nearest
working face and from locations where
mechanized mining equipment is being
installed or removed except that for
underground anthracite coal mines
that have no electrical face equipment,
refuge alternatives shall be provided if
the nearest working face is greater
than 2,000 feet from the surface.
(2) Spaced within one-hour travel distances in outby areas where persons
work such that persons in outby areas
are never more than a 30-minute travel
distance from a refuge alternative or
safe exit. However, the operator may
request and the District Manager may
approve a different location in the
ERP. The operator’s request shall be
based on an assessment of the risk to
persons in outby areas, considering the
following factors: proximity to seals;
proximity to potential fire or ignition
sources; conditions in the outby areas;
location of stored SCSRs; and proximity to the most direct, safe, and
practical route to an intake escapeway.
(d) Roof and rib support for refuge alternative locations shall be specified in
the mine’s roof control plan.
(e) The operator shall protect the refuge alternative and contents from
damage during transportation, installation, and storage.
(f) A refuge alternative shall be removed from service if examination reveals damage that interferes with the
functioning of the refuge alternative or
any component.
(1) If a refuge alternative is removed
from service, the operator shall withdraw all persons from the area serviced
by the refuge alternative, except those
persons referred to in § 104(c) of the
Mine Act.
(2) Refuge alternative components removed from service shall be replaced or
be repaired for return to service in accordance with the manufacturer’s specifications.
(g) At all times, the site and area
around the refuge alternative shall be
kept clear of machinery, materials,
and obstructions that could interfere
with the deployment or use of the refuge alternative.
(h) Each refuge alternative shall be
conspicuously identified with a sign or
marker as follows:
644
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00654
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1507
(1) A sign or marker made of a reflective material with the word ‘‘REFUGE’’ shall be posted conspicuously at
each refuge alternative.
(2) Directional signs made of a reflective material shall be posted leading to
each refuge alternative location.
(i) During use of the refuge alternative, the atmosphere within the refuge alternative shall be monitored.
Changes or adjustments shall be made
to reduce the concentration of methane
to less than 1 percent; to reduce the
concentration of carbon dioxide to 1
percent or less and excursions not exceeding 2.5 percent; and to reduce the
concentration of carbon monoxide to 25
ppm or less. Oxygen shall be maintained at 18.5 to 23 percent.
(j) Refuge alternatives shall contain
a fire extinguisher that—
(1) Meets the requirements for portable fire extinguishers used in underground coal mines under this part;
(2) Is appropriate for extinguishing
fires involving the chemicals used for
harmful gas removal; and
(3) Uses a low-toxicity extinguishing
agent that does not produce a hazardous by-product when activated.
(5) The methods for providing ready
backup oxygen controls and regulators.
(6) The methods for providing an airlock and for providing breathable air in
the airlock, except where adequate
positive pressure is maintained.
(7) The methods for providing sanitation facilities.
(8) The methods for harmful gas removal, if necessary.
(9) The methods for monitoring gas
concentrations, including charging and
calibration of equipment.
(10) The method for providing lighting sufficient for persons to perform
tasks.
(11) Suitable locations for the refuge
alternatives and an affirmative statement that the locations are—
(i) Not within direct line of sight of
the working face; and
(ii) Where feasible, not placed in
areas directly across from, nor closer
than 500 feet radially from, belt drives,
take-ups, transfer points, air compressors, explosive magazines, seals, entrances to abandoned areas, and fuel,
oil, or other flammable or combustible
material storage. However, the operator may request and the District Manager may approve an alternative location in the ERP if mining involves twoentry systems or yield pillars in a
longwall that would prohibit locating
the refuge alternative out of direct line
of sight of the working face.
(12) The maximum mine air temperature at each of the locations where refuge alternatives are to be placed.
(b) For a refuge alternative consisting of 15 psi stoppings constructed
prior to an event in a secure space and
an isolated atmosphere, the ERP shall
specify that—
(1) The breathable air components
shall be approved by MSHA; and
(2) The refuge alternative can withstand exposure to a flash fire of 300 degrees Fahrenheit (°F) for 3 seconds and
a pressure wave of 15 pounds per square
inch (psi) overpressure for 0.2 seconds.
(c) If the refuge alternative sustains
persons for only 48 hours, the ERP
shall detail advanced arrangements
that have been made to assure that
persons who cannot be rescued within
kpayne on VMOFRWIN702 with $$_JOB
[73 FR 80698, Dec. 31, 2008]
§ 75.1507 Emergency Response Plan;
refuge alternatives.
(a) The Emergency Response Plan
(ERP) shall include the following for
each refuge alternative and component:
(1) The types of refuge alternatives
used in the mine, i.e., a prefabricated
self-contained unit or a unit consisting
of 15 psi stoppings constructed prior to
an event in a secure space and an isolated atmosphere.
(2) Procedures or methods for maintaining approved refuge alternatives
and components.
(3) The rated capacity of each refuge
alternative, the number of persons expected to use each refuge alternative,
and the duration of breathable air provided per person by the approved
breathable air component of each refuge alternative.
(4) The methods for providing breathable air with sufficient detail of the
component’s capability to provide
breathable air over the duration stated
in the approval.
645
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00655
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1508
30 CFR Ch. I (7–1–19 Edition)
48 hours will receive additional supplies to sustain them until rescue. Advance arrangements shall include the
following:
(1) Pre-surveyed areas for refuge alternatives with closure errors of less
than 20,000:1.
(2) An analysis to demonstrate that
the surface terrain, the strata, the capabilities of the drill rig, and all other
factors that could affect drilling are
such that a hole sufficient to provide
required supplies and materials reliably can be promptly drilled within 48
hours of an accident at a mine.
(3) Permissions to cross properties,
build roads, and construct drill sites.
(4) Arrangement with a drilling contractor or other supplier of drilling
services to provide a suitable drilling
rig, personnel and support so that a
hole can be completed to the refuge alternative within 48 hours.
(5) Capability to promptly transport
a drill rig to a pre-surveyed location
such that a drilled hole would be completed and located near a refuge alternative structure within 48 hours of an
accident at a mine.
(6) The specifications of pipes, air
lines, and approved fans or approved
compressors that will be used.
(7) A method for assuring that within
48 hours, breathable air shall be provided.
(8) A method for assuring the immediate availability of a backup source
for supplying breathable air and a
backup power source for surface installations.
(d) The ERP shall specify that the
refuge alternative is stocked with the
following:
(1) A minimum of 2,000 calories of
food and 2.25 quarts of potable water
per person per day in approved containers sufficient to sustain the maximum number of persons reasonably
expected to use the refuge alternative
for at least 96 hours, or for 48 hours if
advance arrangements are made under
paragraph (c) of this section;
(2) A manual that contains sufficient
detail for each refuge alternative or
component addressing in-mine transportation, operation, and maintenance
of the unit;
(3) Sufficient quantities of materials
and tools to repair components; and
(4) First aid supplies.
[73 FR 80699, Dec. 31, 2008]
§ 75.1508 Training and records for examination, maintenance and repair
of refuge alternatives and components.
(a) Persons examining, maintaining,
or repairing refuge alternatives and
components shall be instructed in how
to perform this work.
(1) The operator shall assure that all
persons assigned to examine, maintain,
and repair refuge alternatives and components are trained.
(2) The mine operator shall certify,
by signature and date, the training of
persons who examine, maintain, and
repair refuge alternatives and components.
(b) At the completion of each repair,
the person conducting the maintenance
or repair shall make a record of all corrective action taken.
(c) Training certifications and repair
records shall be kept at the mine for
one year.
[73 FR 80699, Dec. 31, 2008]
Subpart Q—Communications
§ 75.1600
Communications.
[STATUTORY PROVISIONS]
Telephone service or equivalent twoway communication facilities, approved by the Secretary or his authorized representative, shall be provided
between the surface and each landing
of main shafts and slopes and between
the surface and each working section of
any coal mine that is more than 100
feet from a portal.
§ 75.1600–1 Communication facilities;
main portals; installation requirements.
A telephone or equivalent two-way
communication facility shall be located on the surface within 500 feet of
all main portals, and shall be installed
either in a building or in a box-like
structure designed to protect the facilities from damage by inclement weather. At least one of these communication facilities shall be at a location
646
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00656
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1702–1
where a responsible person who is always on duty when men are underground can hear the facility and respond immediately in the event of an
emergency.
(2) An additional communication system and other requirements as defined
in the communications portion of the
operator’s approved Emergency Response Plan.
[38 FR 29999, Oct. 31, 1973]
[73 FR 80700, Dec. 31, 2008]
§ 75.1600–2 Communication facilities;
working sections; installation and
maintenance requirements; audible
or visual alarms.
(a) Telephones or equivalent two-way
communication facilities provided at
each working section shall be located
not more than 500 feet outby the last
open crosscut and not more than 800
feet from the farthest point of penetration of the working places on such section.
(b) The incoming communication signal shall activate an audible alarm,
distinguishable from the surrounding
noise level, or a visual alarm that can
be seen by a miner regularly employed
on the working section.
(c) If a communication system other
than telephones is used and its operation depends entirely upon power
from the mine electric system, means
shall be provided to permit continued
communication in the event the mine
electric power fails or is cut off; provided, however, that where trolley
phones and telephones are both used,
an alternate source of power for the
trolley phone system is not required.
(d) Trolley phones connected to the
trolley wire shall be grounded in accordance with Subpart H of this part.
(e) Telephones or equivalent two-way
communication facilities shall be
maintained in good operating condition at all times. In the event of any
failure in the system that results in
loss of communication, repairs shall be
started immediately, and the system
restored to operating condition as soon
as possible.
kpayne on VMOFRWIN702 with $$_JOB
[38 FR 29999, Oct. 31, 1973]
§ 75.1600–3 Communications facilities;
refuge alternatives.
(a) Refuge alternatives shall be provided with a communications system
that consists of—
(1) A two-way communication facility that is a part of the mine communication system, which can be used
from inside the refuge alternative; and
Subpart R—Miscellaneous
§ 75.1700
Oil and gas wells.
[STATUTORY PROVISIONS]
Each operator of a coal mine shall
take reasonable measures to locate oil
and gas wells penetrating coalbeds or
any underground area of a coal mine.
When located, such operator shall establish and maintain barriers around
such oil and gas wells in accordance
with State laws and regulations, except
that such barriers shall not be less
than 300 feet in diameter, unless the
Secretary or his authorized representative permits a lesser barrier consistent
with the applicable State laws and regulations where such lesser barrier will
be adequate to protect against hazards
from such wells to the miners in such
mine, or unless the Secretary or his authorized representative requires a
greater barrier where the depth of the
mine, other geologic conditions, or
other factors warrant such a greater
barrier.
§ 75.1702
Smoking; prohibition.
[STATUTORY PROVISIONS]
No person shall smoke, carry smoking materials, matches, or lighters underground, or smoke in or around oil
houses, explosives magazines, or other
surface areas where such practice may
cause a fire or explosion. The operator
shall institute a program, approved by
the Secretary, to insure that any person entering the underground area of
the mine does not carry smoking materials, matches, or lighters.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1702–1
Smoking programs.
Programs required under § 75.1702
shall be submitted to the Coal Mine
Safety District Manager for approval
on or before May 30, 1970.
647
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00657
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1703
§ 75.1703
30 CFR Ch. I (7–1–19 Edition)
Portable electric lamps.
[STATUTORY PROVISIONS]
Persons underground shall use only
permissible electric lamps approved by
the Secretary for portable illumination. No open flame shall be permitted
in the underground area of any coal
mine, except as permitted under
§ 75.1106.
§ 75.1703–1
Permissible lamps.
Lamps approved by the Bureau of
Mines or the Mine Safety and Health
Administration under Part 19 or Part
20 of this chapter (Bureau of Mines
Schedule 6D and Schedule 10C) are approved lamps for the purposes of
§ 75.1703.
§ 75.1707–1
New working section.
The term ‘‘new working section’’ as
used in § 75.1707 means any extension of
the belt or trolley haulage system in
main, cross, and room entries necessary for the development of the mine
on and after March 30, 1970. Room entries being developed as of March 30,
1970, with certified stop line limitations as shown on the mine map and retreating panels shall not be considered
as new working sections.
§ 75.1708 Surface
proofing.
structures,
fire-
§ 75.1709 Accumulations of methane
and coal dust on surface coal-handling facilities.
[STATUTORY PROVISIONS]
Adequate measures shall be taken to
prevent methane and coal dust from
accumulating in excessive concentrations in or on surface coal-handling facilities, but in no event shall methane
be permitted to accumulate in concentrations in or on surface coal-handling facilities in excess of limits established for methane by the Secretary
on and after March 30, 1971. Where coal
is dumped at or near air-intake openings, provisions shall be made to avoid
dust from entering the mine.
§ 75.1710 Canopies or cabs; diesel-powered and electric face equipment.
In any coal mine where the height of
the coalbed permits, an authorized representative of the Secretary may require that diesel-powered and electric
face equipment, including shuttle cars,
be provided with substantially constructed canopies or cabs to protect
the miners operating such equipment
from roof falls and from rib and face
rolls.
[61 FR 55527, Oct. 25, 1996]
[STATUTORY PROVISIONS]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1708–1 Surface structures; fireproof construction.
Structures of fireproof construction
is interpreted to mean structures with
fireproof exterior surfaces.
After March 30, 1970, all structures
erected on the surface within 100 feet of
any mine opening shall be of fireproof
construction. Unless structures existing on or prior to such date which are
located within 100 feet of any mine
opening are of such construction, fire
doors shall be erected at effective
points in mine openings to prevent
smoke or fire from outside sources endangering miners underground. These
doors shall be tested at least monthly
to insure effective operation. A record
of such tests shall be kept in an area
on the surface of the mine chosen by
the operator to minimize the danger of
destruction by fire or other hazard and
shall be available for inspection by interested persons.
§ 75.1710–1 Canopies or cabs; self-propelled diesel-powered and electric
face equipment; installation requirements.
(a) Except as provided in paragraph
(f) of this section, all self-propelled diesel-powered and electric face equipment, including shuttle cars, which is
employed in the active workings of
each underground coal mine on and
after January 1, 1973, shall, in accordance with the schedule of time specified in paragraphs (a) (1), (2), (3), (4),
(5), and (6) of this section, be equipped
with substantially constructed canopies or cabs, located and installed in
such a manner that when the operator
is at the operating controls of such
equipment he shall be protected from
falls of roof, face, or rib, or from rib
648
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00658
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1710–1
and face rolls. The requirements of this
paragraph (a) shall be met as follows:
(1) On and after January 1, 1974, in
coal mines having mining heights of 72
inches or more;
(2) On and after July 1, 1974, in coal
mines having mining heights of 60
inches or more, but less than 72 inches;
(3) On and after January 1, 1975, in
coal mines having mining heights of 48
inches or more, but less than 60 inches;
(4) On and after July 1, 1975, in coal
mines having mining heights of 36
inches or more, but less than 48 inches;
(5)(i) On and after January 1, 1976, in
coal mines having mining heights of 30
inches or more, but less than 36 inches,
(ii) On and after July 1, 1977, in coal
mines having mining heights of 24
inches or more, but less than 30 inches,
and
(6) On and after July 1, 1978, in coal
mines having mining heights of less
than 24 inches.
(b)(1) For purposes of this section, a
canopy means a structure which provides overhead protection against falls
of roof.
(2) For purposes of this section, a cab
means a structure which provides overhead and lateral protection against
falls of roof, rib, and face, or rib and
face rolls.
(c) In determining whether to install
substantially constructed canopies as
opposed to substantially constructed
cabs, the operator shall consider and
take into account the following factors:
(1) The mining method used;
(2) Physical limitations, including
but not limited to the dip of the coalbed, and roof, rib, and face conditions;
(3) Previous accident experience, if
any, caused by falls of roof, rib, and
face, or rib and face rolls;
(4) Overhead protection, such as that
afforded by a substantially constructed
canopy, against falls of roof will always be required; and
(5) Lateral protection, such as that
afforded by a substantially constructed
cab, may also be necessary where the
occurrence of falls of rib and face, or
rib and face rolls is likely.
(d) For purposes of this section, a
canopy or cab will be considered to be
substantially constructed if a registered engineer certifies that such
canopy or cab has the minimum structural capacity to support elastically:
(1) A dead weight load of 18,000 pounds,
or (2) 15 p.s.i. distributed uniformly
over the plan view area of the structure, whichever is lesser.
(e) Evidence of the certification required by paragraph (d) of this section
shall be furnished by attaching a plate,
label, or other appropriate marking to
the canopy or cab for which certification has been made, stating that
such canopy or cab meets the minimum requirements for structural capacity set forth in paragraph (d) of this
section. Written evidence of such certification shall also be retained by the
operator, and shall be made available
to an authorized representative of the
Secretary upon request. Written evidence of certification may consist of
the report of the registered engineer
who certified the canopy or cab, or of
information from the manufacturer of
the canopy or cab stating that a registered engineer has certified that the
canopy or cab meets the minimum requirements for structural capacity set
forth in paragraph (d) of this section.
(f) An operator may apply to the Director of Technical Support, Mine
Safety and Health Administration, Department of Labor, 201 12th Street
South, Arlington, VA 22202–5452, for approval of the installation of devices to
be used in lieu of substantially constructed canopies or cabs on self-propelled diesel-powered and electric face
equipment. The Director of Technical
Support may approve such devices if he
determines that the use thereof will afford the equipment operator no less
than the same measure of protection
from falls of roof, face, or rib, or from
rib and face rolls as would a substantially constructed canopy or cab meeting the requirements of this section.
[37 FR 20690, Oct. 3, 1972, as amended at 41 FR
23200, June 9, 1976; 43 FR 12320, Mar. 24, 1978;
47 FR 28096, June 29, 1982; 61 FR 55527, Oct. 25,
1996; 67 FR 38386, June 4, 2002; 80 FR 52992,
Sept. 2, 2015]
EFFECTIVE DATE NOTE: At 42 FR 34877, July
7, 1977, the dates appearing in paragraphs
(a)(5)(ii) and (a)(6) of § 75.1710–1 were suspended indefinitely, effective July 1, 1977.
649
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00659
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1711
§ 75.1711
30 CFR Ch. I (7–1–19 Edition)
Sealing of mines.
[STATUTORY PROVISIONS]
On or after March 30, 1970, the opening of any coal mine that is declared
inactive by the operator, or is permanently closed, or abandoned for more
than 90 days, shall be sealed by the operator in a manner prescribed by the
Secretary. Openings of all other mines
shall be adequately protected in a manner prescribed by the Secretary to prevent entrance by unauthorized persons.
§ 75.1711–1 Sealing of shaft openings.
Shaft openings required to be sealed
under § 75.1711 shall be effectively
capped or filled. Filling shall be for the
entire depth of the shaft and, for the
first 50 feet from the bottom of the
coalbed, the fill shall consist of incombustible material. Caps consisting of a
6-inch thick concrete cap or other
equivalent means may be used for sealing. Caps shall be equipped with a vent
pipe at least 2 inches in diameter extending for a distance of at least 15 feet
above the surface of the shaft.
§ 75.1711–2 Sealing of slope or drift
openings.
Slope or drift openings required to be
sealed under § 75.1711 shall be sealed
with solid, substantial, incombustible
material, such as concrete blocks,
bricks or tile, or shall be completely
filled with incombustible material for
a distance of at least 25 feet into such
openings.
§ 75.1711–3 Openings of active mines.
The openings of all mines not declared by the operator, to be inactive,
permanently closed, or abandoned for
less than 90 days shall be adequately
fenced or posted with conspicuous signs
prohibiting the entrance of unauthorized persons.
§ 75.1712
ties.
Bath houses and toilet facili-
kpayne on VMOFRWIN702 with $$_JOB
[STATUTORY PROVISIONS]
The Secretary may require any operator to provide adequate facilities for
the miners to change from the clothes
worn underground, to provide for the
storing of such clothes from shift to
shift, and to provide sanitary and bath-
ing facilities. Sanitary toilet facilities
shall be provided in the active workings of the mine when such surface facilities are not readily accessible to
the active workings.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1712–1 Availability
of
surface
bathing facilities; change rooms;
and sanitary facilities.
Except where a waiver has been
granted pursuant to the provisions of
§ 75.1712–4, each operator of an underground coal mine shall on and after December 30, 1970, provide bathing facilities, clothing change rooms, and sanitary facilities, as hereinafter prescribed, for the use of the miners at the
mine.
§ 75.1712–2 Location of surface facilities.
Bathhouses, change rooms, and sanitary toilet facilities shall be in a location convenient for the use of the miners. Where such facilities are designed
to serve more than one mine, they
shall be centrally located so as to be as
convenient for the use of the miners in
all the mines served by such facilities.
§ 75.1712–3 Minimum requirements of
surface bathing facilities, change
rooms, and sanitary toilet facilities.
(a) All bathing facilities, change
rooms, and sanitary toilet facilities
shall be provided with adequate light,
heat, and ventilation so as to maintain
a comfortable air temperature and to
minimize the accumulation of moisture and odors, and such facilities shall
be maintained in a clean and sanitary
condition.
(b) Bathing facilities, change rooms,
and sanitary toilet facilities shall be
constructed and equipped so as to comply with applicable State and local
building codes: Provided, however, That
where no State or local building codes
apply to such facilities, or where no
State or local building codes exist,
such facilities shall be constructed and
equipped so as to meet the minimum
construction requirements of the National Building Code; and the minimum plumbing requirements of the
U.S.A. Standard Plumbing Code, ASA
A40.8–1955.
650
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00660
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1712–7
(c) In addition to the minimum requirements specified in paragraphs (a)
and (b) of this § 75.1712–3, facilities
maintained
in
accordance
with
§ 75.1712–1 shall include the following:
(1) Bathing facilities. (i) Showers shall
be provided with both hot and cold
water.
(ii) At least one shower head shall be
provided where five or less miners use
such showers.
(iii) Where five or more miners use
such showers, sufficient showers shall
be furnished to provide approximately
one shower head for each five miners.
(iv) A suitable cleansing agent shall
be provided for use at each shower.
(2) Sanitary toilet facilities. (i) At least
one sanitary flush toilet shall be provided where 10 or less miners use such
facilities.
(ii) Where 10 or more miners use such
sanitary toilet facilities, sufficient toilets shall be furnished to provide approximately one sanitary flush toilet
for each 10 miners.
(iii) Where 30 or more miners use sanitary toilet facilities, one urinal may
be substituted for one sanitary flush
toilet, however, where such substitutions are made they shall not reduce
the number of toilets below a ratio of
two toilets to one urinal.
(iv) An adequate supply of toilet
paper shall be provided with each toilet.
(v) Adequate handwashing facilities
or hand lavatories shall be provided in
or adjacent to each toilet facility.
(3) Change rooms. (i) Individual
clothes storage containers or lockers
shall be provided for storage of miners
clothing and other incidental personal
belongings during and between shifts.
(ii) Change rooms shall be provided
with ample space to permit the use of
such facilities by all miners changing
clothes prior to and after each shift.
requirements, and, upon issuance of
such waiver, he shall set forth the facilities which will not be required and
the specific reason or reasons for such
waiver.
§ 75.1712–4 Waiver of surface facilities
requirements.
The Coal Mine Safety District Manager for the district in which the mine
is located may, upon written application by the operator, waive any or all
of the requirements of §§ 75.1712–1
through 75.1712–3 if he determines that
the operator of the mine cannot or
need not meet any part or all of such
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1712–5 Application for waiver of
surface facilities.
Applications for waivers of the requirements of §§ 75.1712–1 through
75.1712–3 shall be filed with the Coal
Mine Safety District Manager and shall
contain the following information:
(a) The name and address of the mine
operator;
(b) The name and location of the
mine;
(c) A statement explaining why, in
the opinion of the operator, the installation or maintenance of the facilities
is impractical or unnecessary.
§ 75.1712–6 Underground sanitary facilities; installation and maintenance.
(a) Except as provided in § 75.1712–7,
each operator of an underground coal
mine shall provide and maintain one
sanitary toilet in a dry location under
protected roof, within 500 feet of each
working place in the mine where miners are regularly employed during the
mining cycle. A single sanitary toilet
may serve two or more working places
in the same mine, if it is located within
500 feet of each such working place.
(b) Sanitary toilets shall have an attached toilet seat with a hinged lid and
a toilet paper holder together with an
adequate supply of toilet tissue, except
that a toilet paper holder is not required for an unenclosed toilet facility.
(c) Only flush or nonflush chemical
or biological toilets, sealed bag toilets,
and vault toilets meet the requirements of this section. Privies and combustion or incinerating toilets are prohibited underground.
[68 FR 37087, June 23, 2003]
§ 75.1712–7 Underground sanitary facilities; waiver of requirements.
If it has been determined by the Coal
Mine Safety District Manager for the
district in which the mine is located
that sanitary toilets cannot be provided and maintained within 500 feet of
651
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00661
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1712–8
30 CFR Ch. I (7–1–19 Edition)
a working place because of the thickness of the coal seam or because of any
other physical restriction in the underground workings, he may, upon written
application by the operator, waive the
location requirements for underground
sanitary facilities with respect to such
working place.
§ 75.1712–8 Application for waiver of
location requirements for underground sanitary facilities.
Applications for waivers of the location requirements of § 75.1712–6 shall be
filed with the Coal Mine Safety District Manager and shall contain the
following information:
(a) The name and address of the mine
operator;
(b) The name and location of the
mine;
(c) The thickness of the coal seam in
each working place in the mine for
which a waiver is requested; and
(d) Other physical restrictions in the
mine (for example, poor roof conditions, excessive water, timbering, etc.).
If a sanitary toilet cannot be installed
within 500 feet of a working place because of physical conditions other than
the thickness of the coal seam, the operator shall also include a short statement specifying areas in the mine
which could be considered possible alternative sites for installation of such
facilities.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1712–9
Issuance of waivers.
Following the receipt of an application submitted in accordance with the
provisions of § 75.1712–8, the Coal Mine
Safety District Manager shall, if he determines that the operator cannot
meet the location requirements of
§ 75.1712–6 with respect to any or all of
the working places in the mine because
of the coal seam thickness or because
of other physical restriction, issue a
waiver of the requirements of this section and designate an alternative site
for installation of such facilities. The
waiver issued shall specify each working place to which it shall apply, set
forth the reasons for such waiver, and
the reasons for designation of the alternative site.
§ 75.1712–10 Underground sanitary facilities; maintenance.
Sanitary toilets shall be regularly
maintained in a clean and sanitary
condition. Holding tanks shall be serviced and cleaned when full and in no
case less than once each week by draining or pumping or by removing them to
the surface for cleaning or recharging.
Transfer tanks and transfer equipment
used underground shall be equipped
with suitable fittings to permit complete drainage of holding tanks without spillage and allow for the sanitary
transportation of wastes to the surface.
Waste shall be disposed of on the surface in accordance with State and local
laws and regulations.
§ 75.1713 Emergency
ance; first-aid.
medical
[STATUTORY PROVISIONS]
Each operator shall make arrangements in advance for obtaining emergency medical assistance and transportation for injured persons. Emergency
communications shall be provided to
the nearest point of assistance. Selected agents of the operator shall be
trained in first-aid and first-aid training shall be made available to all miners. Each coal mine shall have an adequate supply of first-aid equipment located on the surface, at the bottom of
shafts and slopes, and at other strategic locations near the working faces.
In fulfilling each of the requirements
of this section, the operator shall meet
at least minimum requirements prescribed by the Secretary of Health and
Human Services.
[35 FR 17890, Nov. 20, 1970, as amended at 47
FR 14696, Apr. 6, 1982; 60 FR 33723, June 29,
1995]
§ 75.1713–1 Arrangements for emergency medical assistance and transportation for injured persons;
agreements;
reporting
requirements; posting requirements.
(a) Each operator of an underground
coal mine shall make arrangements
with a licensed physician, medical
service, medical clinic, or hospital to
provide 24-hour emergency medical assistance for any person injured at the
mine.
652
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00662
Fmt 8010
assist-
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1713–6
(b) Each operator of an underground
coal mine shall make arrangements
with an ambulance service, or otherwise provide, for 24-hour emergency
transportation for any person injured
at the mine.
(c) Each operator shall, on or before
December 30, 1970, report to the District Manager for the district in which
the mine is located the name, title and
address of the physician, medical service, medical clinic, hospital or ambulance service with whom arrangements
have been made, or otherwise provided,
in accordance with the provisions of
paragraphs (a) and (b) of this § 75.1713–
1.
(d) Each operator shall, within 10
days after any change of the arrangements required to be reported under
the provisions of this § 75.1713–1, report
such changes to the District Manager.
If such changes involve a substitution
of persons, the operator shall provide
the name, title, and address of the person substituted together with the name
and address of the medical service,
medical clinic, hospital, or ambulance
service with which such person or persons are associated.
(e) Each operator shall, immediately
after making an arrangement required
under the provisions of paragraphs (a)
and (b) of this § 75.1713–1, or immediately after any change of such arrangement, post at appropriate places
at the mine the names, titles, addresses, and telephone numbers of all persons or services currently available
under such arrangements to provide
medical assistance and transportation
at the mine.
means of communication with the person or persons providing emergency
medical assistance or transportation in
accordance with the provisions of
§ 75.1713–1.
§ 75.1713–2 Emergency
communications; requirements.
(a) Each operator of an underground
coal mine shall establish and maintain
a communication system from the
mine to the nearest point of medical
assistance for use in an emergency.
(b) The emergency communication
system required to be maintained
under paragraph (a) of this § 75.1713–2
may be established by telephone or
radio transmission or by any other
means of prompt communication to
any facility (for example, the local
sheriff, the State highway patrol, or
local hospital) which has available the
§ 75.1713–3 First-Aid training; supervisory employees.
The mine operator shall conduct
first-aid training courses for selected
supervisory employees at the mine.
Within 60 days after the selection of a
new supervisory employee to be so
trained, the mine operator shall certify
by signature and date the name of the
employee and date on which the employee satisfactorily completed the
first-aid training course. The certification shall be kept at the mine and
made available on request to an authorized representative of the Secretary.
[56 FR 1478, Jan. 14, 1991]
§ 75.1713–4 First-aid training program;
availability of instruction to all
miners.
On or before June 30, 1971, each operator of an underground coal mine shall
make available to all miners employed
in the mine a course of instruction in
first-aid conducted by the operator or
under the auspices of the operator, and
such a course of instruction shall be
made available to newly employed
miners within 6 months after the date
of employment.
§ 75.1713–5 First-aid training program;
retraining of supervisory employees; availability to all miners.
Beginning January 1, 1971, each operator of an underground coal mine shall
conduct refresher first-aid training
courses each calendar year for all selected supervisory employees, and
make available refresher first-aid
training courses to all miners employed in the mine.
§ 75.1713–6 First-aid training program;
minimum requirements.
(a) All first-aid training programs required
under
the
provisions
of
§§ 75.1713–3 and 75.1713–4 shall include 10
class hours of training in a course of
instruction similar to that outlined in
‘‘First Aid, A Bureau of Mines Instruction Manual.’’
653
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00663
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1713–7
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
(b) Refresher first-aid training programs required under the provisions of
§ 75.1713–5 shall include five class hours
of refresher training in a course of instruction similar to that outlined in
‘‘First Aid, A Bureau of Mines Instruction Manual.’’
§ 75.1713–7 First-aid equipment; location; minimum requirements.
(a) Each operator of an underground
coal mine shall maintain a supply of
the first-aid equipment set forth in
paragraph (b) of this § 75.1713–7 at each
of the following locations:
(1) At the mine dispatcher’s office or
other appropriate work area on the
surface in close proximity to the mine
entry;
(2) At the bottom of each regularly
traveled slope or shaft; however, where
the bottom of such slope or shaft is not
more than 1,000 feet from the surface,
such first-aid supplies may be maintained on the surface at the entrance
to the mine; and
(3) At a point in each working section
not more than 500 feet outby the active
working face or faces.
(b) The first-aid equipment required
to be maintained under the provisions
of paragraph (a) of this § 75.1713–7 shall
include at least the following:
(1) One stretcher;
(2) One broken-back board. (If a
splint stretcher combination is used it
will satisfy the requirements of both
(1) and (2)).
(3) 24 triangular bandages (15 if a
splint-stretcher combination is used).
(4) Eight 4-inch bandage compresses;
(5) Eight 2-inch bandage compresses.
(6) Twelve 1-inch adhesive compresses;
(7) One foille;
(8) Two cloth blankets:
(9) One rubber blanket or equivalent
substitute.
(10) Two tourniquets;
(11) One 1-ounce bottle of aromatic
spirits of ammonia or 1 dozen ammonia
ampules.
(12) The necessary complements of
arm and leg splints or two each inflatable plastic arm and leg splints.
(c) All first-aid supplies required to
be maintained under the provisions of
paragraphs (a) and (b) of this § 75.1713–
7 shall be stored in suitable, sanitary,
dust tight, moisture proof containers
and such supplies shall be accessible to
the miners.
§ 75.1714 Availability of approved selfrescue devices; instruction in use
and location.
(a) Each operator shall make available to each miner who goes underground, and to visitors authorized to
enter the mine by the operator, an approved self-rescue device or devices
which is adequate to protect such person for 1 hour or longer.
(b) Before any person authorized by
the operator goes underground, the operator shall instruct and train such
person in accordance with provisions
set forth in 30 CFR part 48.
[43 FR 54246, Nov. 21, 1978, as amended at 53
FR 10336, Mar. 30, 1988; 60 FR 30401, June 8,
1995; 71 FR 71454, Dec. 8, 2006]
§ 75.1714–1
vices.
Approved
self-rescue
The requirements of § 75.1714 shall be
met by making available to each person referred to in that section a selfrescue device or devices, which have
been approved by MSHA and NIOSH
under 42 CFR part 84, as follows:
(a) A 1-hour SCSR;
(b) A SCSR of not less than 10 minutes and a 1-hour canister; or
(c) Any other self-contained breathing apparatus which provides protection for a period of 1 hour or longer and
which is approved for use by MSHA as
a self-rescue device when used and
maintained as prescribed by MSHA.
[60 FR 30401, June 8, 1995]
§ 75.1714–2 Self-rescue devices;
and location requirements.
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00664
Fmt 8010
use
(a) Self-rescue devices shall be used
and located as prescribed in paragraphs
(b) through (f) of this section.
(b) Except as provided in paragraph
(c), (d), (e), or (f) of this section, selfrescue devices shall be worn or carried
at all times by each person when underground.
(c) Where the wearing or carrying of
the self-rescue device is hazardous to
the person, it shall be placed in a readily accessible location no greater than
25 feet from such person.
654
VerDate Sep<11>2014
de-
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1714–3
(d) Where a person works on or
around equipment, the self-rescue device may be placed in a readily accessible location on such equipment.
(e) A mine operator may apply to the
District Manager under § 75.1502 for permission to place the SCSR more than
25 feet away.
(1) The District Manager shall consider the following factors in deciding
whether to permit an operator to place
a SCSR more than 25 feet from a
miner:
(i) Distance from affected sections to
surface,
(ii) Pitch of seam in affected sections,
(iii) Height of coal seam in affected
sections,
(iv) Location of escapeways,
(v) Proposed location of SCSRs,
(vi) Type of work performed by affected miners,
(vii) Degree of risk to which affected
miners are exposed,
(viii) Potential for breaking into oxygen deficient atmospheres,
(ix) Type of risk to which affected
miners are exposed,
(x) Accident history of mine, and
(xi) Other matters bearing upon the
safety of miners.
(2) Such application shall not be approved by the District Manager unless
it provides that, while underground, all
miners whose SCSR is more than 25
feet away shall have a FSR approved
by MSHA and NIOSH under 42 CFR
part 84 sufficient to enable each miner
to get to a SCSR.
(3) An operator may not obtain permission under paragraph (e) of this section to place SCSRs more than 25 feet
away from miners on trips into and out
of the mine.
(f) If an SCSR is not carried out of
the mine at the end of a miner’s shift,
the place of storage shall be approved
by the District Manager. A sign made
of reflective material with the word
‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall
be conspicuously posted at each SCSR
storage location. Direction signs made
of a reflective material shall be posted
leading to each storage location.
(g) Where devices of not less than 10
minutes and 1 hour are made available
in accordance with § 75.1714–1(b), such
devices shall be used and located as follows:
(1) Except as provided in paragraphs
(c) and (d) of this section, the device of
not less than 10 minutes shall be worn
or carried at all times by each person
when underground, and
(2) The one-hour canister shall be
available at all times to all persons
when underground in accordance with
a plan submitted by the mine operator
and approved by the District Manager.
When the one-hour canister is placed in
a storage location, a sign made of a reflective material with the word
‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall
be conspicuously posted at each storage location. Direction signs made of a
reflective material shall be posted
leading to each storage location.
[43 FR 54246, Nov. 21, 1978, as amended at 60
FR 30401, June 8, 1995; 69 FR 8108, Feb. 23,
2004; 71 FR 12270, Mar. 9, 2006; 71 FR 71454,
Dec. 8, 2006]
§ 75.1714–3 Self-rescue devices; inspection, testing, maintenance, repair,
and recordkeeping.
(a) Each operator shall provide for
proper inspection, testing, maintenance, and repair of self-rescue devices
by a person trained to perform such
functions.
(b) After each time a self-rescue device is worn or carried by a person, the
device shall be inspected for damage
and for the integrity of its seal by a
person trained to perform this function. Self-rescue devices with broken
seals or which are damaged so that the
device will not function properly shall
be removed from service.
(c) All FSRs approved by MSHA and
NIOSH under 42 CFR part 84, except devices using vacuum containers as the
only method of sealing, shall be tested
at intervals not exceeding 90 days by
weighing each device on a scale or balance accurate to within + 1 gram. A device that weighs more than 10 grams
over its original weight shall be removed from service.
(d) All SCSRs approved by MSHA and
NIOSH under 42 CFR part 84 shall be
tested in accordance with instructions
approved by MSHA and NIOSH. Any
device which does not meet the specified test requirements shall be removed
from service.
655
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00665
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1714–4
30 CFR Ch. I (7–1–19 Edition)
(e) At the completion of each test required by paragraphs (c) and (d) of this
section the person making the tests
shall certify by signature and date that
the tests were done. This person shall
make a record of all corrective action
taken. Certifications and records shall
be kept at the mine and made available
on request to an authorized representative of the Secretary.
(f) Self-rescue devices removed from
service shall be repaired for return to
service only by a person trained to perform such work and only in accordance
with the manufacturer’s instructions.
(2) Storage locations shall be spaced
along each escapeway at 30-minute
travel distances no greater than the
distances determined by—
(i) Calculating the distance an average miner walks in 30 minutes by using
the time necessary for each miner in a
sample of typical miners to walk a typical length of each escapeway; or
(ii) Using the SCSR storage location
spacing specified in the following table,
except for escapeways with grades over
5 percent.
kpayne on VMOFRWIN702 with $$_JOB
[43 FR 54246, Nov. 21, 1978, as amended at 47
FR 14706, Apr. 6, 1982; 56 FR 1478, Jan. 14,
1991; 60 FR 30402, June 8, 1995; 60 FR 33723,
June 29, 1995]
§ 75.1714–4 Additional
self-contained
self-rescuers (SCSRs).
(a) Additional SCSRs in work places. In
addition to the requirements in
§§ 75.1714,
75.1714–1,
75.1714–2,
and
75.1714–3 of this part, the mine operator
shall provide the following:
(1) At least one additional SCSR,
which provides protection for a period
of one hour or longer, for each person
at a fixed underground work location.
(2) Additional SCSRs along the normal travel routes for pumpers, examiners, and other persons who do not
have a fixed work location to be stored
at a distance an average miner could
walk in 30 minutes. The SCSR storage
locations shall be determined by using
one of the methods found under paragraph (c)(2) of this section.
(b) Additional SCSRs on mantrips. If a
mantrip or mobile equipment is used to
enter or exit the mine, at least one additional SCSR, which provides protection for a period of one hour or longer,
shall be available for each person who
uses such transportation from portal to
portal.
(c) Additional SCSRs in escapeways.
When each person underground cannot
safely evacuate the mine within 30
minutes, the mine operator shall provide additional SCSRs stored in each
required escapeway.
(1) Each storage location shall contain at least one SCSR, which provides
protection for a period of one hour or
longer, for every person who will be
inby that location.
Average entry height
<40 in. (Crawl) ...................................................
>40–<50 in. (Duck Walk) ...................................
>50–<65 in. (Walk Head Bent) ..........................
>65 in. (Walk Erect) ..........................................
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00666
Fmt 8010
2,200
3,300
4,400
5,700
(d) Additional SCSRs in hardened
rooms. As an alternative to providing
SCSR storage locations in each
escapeway, the mine operator may
store SCSRs in a hardened room located between adjacent escapeways.
(1) The hardened room shall be designed and constructed to the same explosion force criteria as seals.
(2) The hardened room shall include a
means to provide independent, positive
pressure ventilation from the surface
during an emergency.
(3) The District Manager shall approve the design and construction of
hardened rooms in the ventilation
plan.
(4) These SCSR storage locations
shall be spaced in accordance with
paragraph (c) of this section.
(e) Storage location accessibility. All
SCSRs required under this section
shall be stored according to the manufacturers’ instructions, in conspicuous
locations readily accessible by each
person in the mine.
(f) Storage location signs. A sign made
of reflective material with the words
‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall
be conspicuously posted at each storage location. Direction signs made of a
reflective material shall be posted
leading to each storage location.
[71 FR 71454, Dec. 8, 2006]
656
VerDate Sep<11>2014
Maximum
distance
between
SCSR storage locations (in ft.)
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1716
§ 75.1714–5 Map locations of self-contained self-rescuers (SCSR).
The mine operator shall indicate the
locations of all stored SCSRs on the
mine maps required by §§ 75.1200 and
75.1505 of this part.
report the change to MSHA within the
quarter that the change occurs (Jan–
Mar, Apr–Jun, Jul–Sep, Oct–Dec).
(b) Reporting SCSR problems. A mine
operator shall report to MSHA any defect, performance problem, or malfunction with the use of an SCSR. The report shall include a detailed description of the problem and, for each SCSR
involved, the information required by
paragraph (a)(1) of this section.
(c) Retention of problem SCSRs. The
mine operator shall preserve and retain
each SCSR reported under paragraph
(b) of this section for 60 days after reporting the problem to MSHA.
[71 FR 71454, Dec. 8, 2006]
§ 75.1714–6 Emergency tethers.
At least one tether, which is a durable rope or equivalent material designed to permit members of a mine
crew to link together while evacuating
the mine during an emergency, shall be
provided and stored with the additional
SCSRs on the fixed work location and
on the mobile equipment required in
§§ 75.1714–4(a)(1) and (b) of this part.
[71 FR 71454, Dec. 8, 2006]
§ 75.1715
[71 FR 71454, Dec. 8, 2006]
[STATUTORY PROVISIONS]
§ 75.1714–7 Multi-gas detectors.
(a) Availability. A mine operator shall
provide an MSHA-approved, handheld,
multi-gas detector that can measure
methane, oxygen, and carbon monoxide
to each group of underground miners
and to each person who works alone,
such as pumpers, examiners, and outby
miners.
(b) Qualified person. At least one person in each group of underground miners shall be a qualified person under
§ 75.150 of this part and each person who
works alone shall be trained to use the
multi-gas detector.
(c)
Maintenance
and
calibration.
Multi-gas detectors shall be maintained and calibrated as specified in
§ 75.320 of this part.
[71 FR 71454, Dec. 8, 2006]
kpayne on VMOFRWIN702 with $$_JOB
Identification check system.
§ 75.1714–8 Reporting SCSR inventory
and malfunctions; retention of
SCSRs.
(a) SCSR inventory. A mine operator
shall submit to MSHA a complete inventory of all SCSRs at each mine.
New mines shall submit the inventory
within 3 months of beginning operation.
(1) The inventory shall include—
(i) Mine name, MSHA mine ID number, and mine location; and
(ii) For each SCSR unit, the manufacturer, the model type, the date of
manufacture, and the serial number.
(2) In the event that a change in the
inventory occurs, a mine operator shall
Each operator of a coal mine shall establish a check-in and check-out system which will provide positive identification of every person underground,
and will provide an accurate record of
the persons in the mine kept on the
surface in a place chosen to minimize
the danger of destruction by fire or
other hazard. Such record shall bear a
number identical to an identification
check that is securely fastened to the
lamp belt worn by the person underground. The identification check shall
be made of a rust resistant metal of
not less than 16 gauge.
§ 75.1716
Operations under water.
[STATUTORY PROVISIONS]
Whenever an operator mines coal
from a coal mine opened after March
30, 1970, or from any new working section of a mine opened prior to such
date, in a manner that requires the
construction, operation, and maintenance of tunnels under any river,
stream, lake, or other body of water,
that is, in the judgment of the Secretary, sufficiently large to constitute
a hazard to miners, such operator shall
obtain a permit from the Secretary
which shall include such terms and
conditions as he deems appropriate to
protect the safety of miners working or
passing through such tunnels from
caveins and other hazards. Such permits shall require, in accordance with
a plan to be approved by the Secretary,
657
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00667
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1716–1
30 CFR Ch. I (7–1–19 Edition)
that a safety zone be established beneath and adjacent to such body of
water. No plan shall be approved unless
there is a minimum of cover to be determined by the Secretary, based on
test holes drilled by the operator in a
manner to be prescribed by the Secretary. No such permit shall be required in the case of any new working
section of a mine which is located
under any water resource reservoir
being constructed by a Federal agency
on December 30, 1969, the operator of
which is required by such agency to operate in a manner that protects the
safety of miners working in such section from cave-ins and other hazards.
[35 FR 17890, Nov. 20, 1970, as amended at 60
FR 33723, June 29, 1995]
§ 75.1716–1 Operations under
notification by operator.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1716–4
Issuance of permits.
If the Coal Mine Safety District Manager determines that the proposed mining operations under water can be safely conducted, he shall issue a permit
for the conduct of such operations
under such conditions as he deems necessary to protect the safety of miners
engaged in those operations.
§ 75.1717
water;
An operator planning to mine coal
from coal mines opened after March 30,
1970, or from working sections in mines
opened prior to such date, and in such
manner that mining operations will be
conducted, or tunnels constructed,
under any river, stream, lake, or other
body of water, shall give notice to the
Coal Mine Safety District Manager in
the district in which the mine is located prior to the commencement of
such mining operations.
§ 75.1716–2
(e) A profile map showing the type of
strata and the distance in elevation between the coal bed and the river,
stream, lake or other body of water involved. The type of strata shall be determined by core test drill holes as prescribed by the Coal Mine Safety District Manager.
Exemptions.
[STATUTORY PROVISIONS]
No notice under § 75.1716–1 and no permit under § 75.1716–2 shall be required
in the case of any new working section
of a mine which is located under any
water resource reservoir being constructed by a Federal agency as of December 30, 1969, and where the operator
is required by such agency to operate
in a manner that adequately protects
the safety of miners.
§ 75.1718
Drinking water.
[STATUTORY PROVISIONS]
Permit required.
If in the judgment of the Coal Mine
Safety District Manager the proposed
mining operations referred to in
§ 75.1716–1 constitute a hazard to miners, he shall promptly so notify the operator that a permit is required.
An adequate supply of potable water
shall be provided for drinking purposes
in the active workings of the mine, and
such water shall be carried, stored, and
otherwise protected in sanitary containers.
§ 75.1716–3
§ 75.1718–1
Applications for permits.
An application for a permit required
under this section shall be filed with
the Coal Mine Safety District Manager
and shall contain the following general
information:
(a) Name and address of the company.
(b) Name and address of the mine.
(c) Projected mining and ground support plans.
(d) A mine map showing the locations
of the river, stream, lake, or other
body of water and its relation to the location of all working places.
Drinking water; quality.
(a) Potable water provided in accordance with the provisions of § 75.1718
shall meet the applicable minimum
health requirements for drinking water
established by the State or community
in which the mine is located.
(b) Where no state or local health requirements apply to drinking water or
where no state or local minimum
health requirements exist, drinking
water provided in accordance with the
provisions of § 75.1718 shall contain a
minimum of 0.2 milligrams of free chlorine per liter of water.
658
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00668
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1719–1
§ 75.1719 Illumination; purpose and
scope of §§ 75.1719 through 75.1719–
4; time for compliance.
graphs (e)(1) through (e)(6) of this section.
(1) Continuous miners and coal-loading
equipment. In working places in which
continuous miners and coal-loading
equipment are operated, the areas
which shall be illuminated shall be as
follows:
(i) The face, and
(ii) The ribs, roof, floor, and exposed
surface of mining equipment, which are
between the face and the inby end of
the shuttle car or other conveying
equipment while in position to receive
material.
(2) Self-loading haulage equipment used
as a loading machine. In working places
in which self-loading haulage equipment is operated to load material, the
areas which shall be illuminated shall
be as follows:
(i) The face, and
(ii) The ribs, roof, floor, and exposed
surfaces of mining equipment, which
are between the face and a point 5 feet
outby the machine.
(3) Cutting and drilling equipment. In
working places in which cutting or
drilling equipment is operated, the
areas which shall be illuminated shall
be as follows:
(i) The ribs, roof, floor, and exposed
surfaces of mining equipment, which
are between the face and a point 5 feet
outby the machine.
(4) Shortwall and longwall mining
equipment. In working places in which
shortwall or longwall mining equipment is operated, the areas which shall
be illuminated shall be as follows:
(i) The area for the length of the selfadvancing roof suport system and
which is between the gob-side of the
travelway and the side of the block of
coal from which coal is being extracted, and
(ii) The control station, and the head
piece and tail piece of the face conveyor, and
(iii) The roof and floor for a distance
of 5 feet horizontally from the control
station, head piece and tail piece.
(5) Roof bolting equipment. In working
places in which roof bolting equipment
is operated, the areas which shall be illuminated shall be as follows:
(i) Where the distance from the floor, to
the roof is 5 feet, or less: the face, ribs,
roof, floor, and exposed surfaces of
(a) Section 317(e) of the Act (30 U.S.C.
877(e)) directs and authorizes the Secretary to propose and promulgate
standards under which all working
places in a mine shall be illuminated
by permissible lighting while persons
are working in such places §§ 75.1719
through 75.1719–4 prescribe the requirements for illumination of working
places in underground coal mines while
persons are working in such places and
while self-propelled mining equipment
is operated in the working place.
(b) Mine operators shall comply with
§§ 75.1719 through 75.1719–4 not later
than July 1, 1978.
[41 FR 43534, Oct. 1, 1976, as amended at 43 FR
13564, Mar. 31, 1978]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1719–1 Illumination
places.
in
working
(a) Each operator of an underground
coal mine shall provide each working
place in the mine with lighting as prescribed in §§ 75.1719–1 and 75.1719–2 while
self-propelled mining equipment is operated in the working place.
(b) Self-propelled mining equipment;
definition. For the purposes of §§ 75.1719
through 75.1719–4, ‘‘self-propelled mining equipment’’ means equipment
which possesses the capability of moving itself or its associated components
from one location to another by electric, hydraulic, pneumatic, or mechanical power supplied by a source located
on the machine or transmitted to the
machine by cables, ropes, or chains.
(c) The lighting prescribed in this
section shall be in addition to that provided by personal cap lamps.
(d) The luminous intensity (surface
brightness) of surfaces that are in a
miner’s normal field of vision of areas
in working places that are required to
be lighted shall be not less than 0.06
footlamberts when measured in accordance with § 75.1719–3.
(e) When self-propelled mining equipment specified in paragraphs (e)(1)
through (e)(6) of this section is operated in a working place, the areas
within a miner’s normal field of vision
which shall be illuminated in the working place shall be as prescribed in para-
659
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00669
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1719–2
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
mining equipment, which are within an
area the perimeter of which is a distance of 5 feet from the machine, when
measured parallel to the floor.
(ii) Where the distance from the floor to
the roof is more than 5 feet: the face,
ribs, roof, floor, and exposed surfaces of
mining equipment, which are within an
area the perimeter of which from the
front and sides of the machine is a distance equal to the distance from the
floor to the roof and from the rear of
the machine a distance of 5 feet, when
measured parallel to the floor.
(6) Other self-propelled equipment. Unless the entire working place is illuminated by stationary lighting equipment, in working places in which selfpropelled equipment is operated, other
than equipment specified in paragraphs
(e)(1) through (e)(5) of this section, illumination shall be provided as follows:
(i) Luminaires shall be installed on
each machine operated in the working
place which shall illuminate a face or
rib coal surface which is within 10 feet
of the front and the rear of the machine to a luminous intensity of not
less than 0.06 footlamberts, and
(ii) The height and width of the area
of the coal surface which shall be illuminated shall equal the height and
width, respectively, of the machine on
which the luminaires are installed, and
(iii) The luminaires in the direction
of travel shall be operated at all times
the equipment is being trammed in the
working place.
(f) The Administrator, Coal Mine
Health and Safety, MSHA, may specify
other areas in a working place to be illuminated for the protection of miners
while self-propelled mining equipment
is being operated in the working place.
(g) Surface brightness of floor, roof,
coal and machine surfaces in the normal visual field of a miner shall not
vary more than 50 percent between adjacent fields of similar surface reflectance, and the maximum surface
brightness of such surface shall not exceed 120 footlamberts when measured
in accordance with § 75.1719–3.
[41 FR 43534, Oct. 1, 1976, as amended at 42 FR
18859, Apr. 11, 1977; 43 FR 43458, Sept. 26, 1978;
47 FR 28096, June 29, 1982]
§ 75.1719–2
ments.
Lighting fixtures; require-
(a) Lighting fixtures shall be permissible.
(b) Lighting fixtures may be installed
on self-propelled machines or may be
stationary lighting fixtures.
(c)(1) Electrically operated lighting
fixtures shall be energized by direct
current, or by sinusoidal full wave alternating current not less than 50 cycles per second (100 pulses per second),
or by an equivalent power source that
causes no greater flicker.
(2) Alternating current circuits supplying power to stationary lighting fixtures shall contain conductors energized at voltages not greater than 70
volts to ground. Alternating current
circuits, energized at 100 volts or more
and used to supply power to staionary
lighting fixtures, shall originate at a
transformer having a center or neutral
tap grounded to earth through a proper
resistor, which shall be designed to
limit fault current to not more than 5
amperes. A grounding circuit in accordance with § 75.701–4 shall orignate
at the grounded terminal of the
grounding resistor and extend along
with the power conductors and serve as
a grounding conductor for the frames
of all equipment receiving power from
the circuit. The ground fault current
rating of grounding resistors shall
meet the ‘‘extended time rating’’ set
forth in the Institute of Electrical and
Electronics Engineers, Inc. Standard
No. 32 (IEEE Std. 32–1972) which is
hereby incorporated by reference and
made a part hereof. The incorporated
publication is available for examination at each MSHA Coal Mine Safety
and Health district office, and may be
obtained from the Institute of Electrical and Electronics Engineers, Inc.,
Publications Office, 10662 Los Vaqueros
Circle, P.O. Box 3014 Los Alamitos, CA
90720–1264 Telephone: 800–272–6657 (toll
free); http://www.ieee.org.
(3) Machine-mounted lighting fixtures shall be electrically grounded to
the machine by a separate grounding
conductor in compliance with § 75.701–4.
(d) Direct current circuits in excess
of a nominal voltage of 300 volts shall
not be used to supply power to stationary light fixtures.
660
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00670
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1719–3
(e) Cables conducting power to stationary lighting fixtures from both alternating and direct current power
sources, other than intrinsically safe
devices, shall be considered trailing cables, and shall meet rhe requirements
of Subpart G of this part. In addition,
such cables shall be protected against
overloads and short circuits by a suitable circuit breaker or other device approved by the Secretary. Circuit breakers or other device approved by the
Secretary protecting trailing cables receiving power from resistance grounded
circuits shall be equipped with a
ground trip arrangement which shall
be designed to deenergize the circuit at
not more than 50% of the available
fault current.
(f) Before shunts are removed from
blasting caps, lighting fixtures and associated cables located in the same
working place shall be deenergized.
Furthermore, lighting fixtures shall be
removed out of the line of blast and not
less than 50 feet from the blasting operation
unless
otherwise
protected
against flying debris.
(g) Lighting fixtures shall be designed and installed to minimize discomfort glare.
(2) In areas of working places specified in § 75.1719–1(e)(4) luminous intensity measurements may be made at
any time longwall or shortwall mining
equipment is operated except that
when measurements are made in the
vicinity of shearers, plows, or continuous miners, the equipment shall be
idle while measurements are being
made.
(3) In areas of working places specified in § 75.1719–1(e)(5) luminous intensity measurements of the face, ribs,
roof, floor, and exposed surfaces of
mining equipment, shall be made with
the machine idle and located in the approximate center of the working place
with the drilling head toward the face
and a distance from the face of 5 feet,
or the distance from the floor to the
roof, whichever is applicable. When the
machine is located in the center of the
working place and the surfaces of the
ribs to be illuminated are not within
the perimeter of the area determined
in accordance with § 75.1719–1(e)(5), the
machine shall be positioned the applicable distance from the face and each
rib and luminous intensity measurements made for each rib, provided,
however, that luminous intensity
measurements may be made of the
face, roof, floor, and exposed surfaces
of mining equipment with the machine
so located without locating the machine in the center of the working
place.
(4) In areas of working places specified in § 75.1719–1(e)(6), luminous intensity measurements of a coal surface
shall be made with the machine idle
and located in the approximate center
of the working place with the appropriate end toward the face and not less
than 9 feet nor more than 10 feet from
the face.
(5) The area of surfaces to be measured shall be divided into round or
square fields having an area of not less
than 3 nor more than 5 square feet as
illustrated by the following figure:
[41 FR 43534, Oct. 1, 1976, as amended at 71 FR
16669, Apr. 3, 2006]
§ 75.1719–3 Methods of measurement;
light measuring instruments.
kpayne on VMOFRWIN702 with $$_JOB
(a) Compliance with § 75.1719–1(d)
shall be determined by MSHA by measuring luminous intensity (surface
brightness).
(b) In measuring luminous intensity
the following procedures shall be used:
(1) In areas of working places specified in §§ 75.1719.1(e)(1) through 75.1719–
1(e)(3) luminous intensity measurements of the face, ribs, roof, floor, and
exposed surfaces of mining equipment,
shall be made with the machine idle
and located in the approximate center
of the working place with the cutting,
loading, or drilling head toward the
face and not more than 3 feet from the
face.
661
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00671
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1719–3
30 CFR Ch. I (7–1–19 Edition)
EC22OC91.022
(8) Measurements shall not be made
where shadows are cast by roof control
posts, ventilation equipment, or other
obstructions necessary to insure safe
mining conditions.
(9) Where machine-mounted light fixtures are used on equipment, except
self advancing roof support systems,
measurements shall not be made of
surfaces on or within 1 foot of a selfpropelled machine.
(c) For the purpose of making illumination measurements, an authorized
representative of the Secretary may require the installation of temporary
roof supports or the removal of the
equipment to a similar working place
in which permanent roof supports have
been installed.
(d) Light measuring instruments
shall be properly calibrated and maintained. Instruments shall be calibrated
against standards traceable to the National Institute of Standards and Technology (Formerly the National Bureau
of Standards) and color corrected to
the Commission Internationale de
l’Eclairage (CIE) Spectral Luminous
Curve. The CIE Spectral Luminous
Curve is as follows:
662
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00672
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
EC22OC91.021
kpayne on VMOFRWIN702 with $$_JOB
(6) Measurements shall be taken with
the photometer held approximately
perpendicular to the surface being
measured and a sufficient distance
from the surface to allow the light
sensing element in the instrument to
receive reflected light from a field of
not less than 3 nor more than 5 square
feet. The luminous intensity of each
such field shall be not less than 0.06
footlambert.
(7) In areas of working places where
clearances are restricted to the extent
that the photometer cannot be held a
sufficient distance from the surface to
allow the light sensing element in the
instrument to receive reflected light
from a field having an area of at least
3 square feet, luminous intensity shall
be considered as the average of four
uniformly spaced readings taken at the
corners and within a square field having an area of approximately 4 square
feet. In such instances, the area of each
of the individual readings shall not exceed 100 square inches. The average of
the four readings shall be not less than
0.06 footlambert. The method of measurement is illustrated by the following
figure:
Mine Safety and Health Admin., Labor
[41 FR 43534, Oct. 1, 1976, as amended at 71 FR
16669, Apr. 3, 2006]
§ 75.1719–4 Mining
machines,
lamps; requirements.
cap
(a) Paint used on exterior surfaces of
mining machines shall have a minimum reflectance of 30 percent, except
cab interiors and other surfaces which
might adversely affect visibility.
(b) When stationary light fixtures are
used, red reflectors mounted in protective frames or reflecting tape shall be
installed on each end of mining machines, except that continuous mining
machines, loaders, and cutters need
only have such reflectors or tape on
the outby end. Reflectors or reflecting
tape shall have an area of not less than
10 square inches.
(c) Each person who goes underground shall be required to wear an approved personal cap lamp or an equivalent portable light.
(d) Each person who goes underground shall be required to wear a hard
hat or hard cap which shall have a minimum of 6 square inches of reflecting
tape or equivalent paint or material on
each side and back.
[41 FR 43534, Oct. 1, 1976]
On and after the effective date of this
§ 75.1720 each miner regularly employed
in the active workings of an under-
ground coal mine shall be required to
wear the following protective clothing
and devices:
(a) Protective clothing or equipment
and face-shields or goggles when welding, cutting, or working with molten
metal or when other hazards to the
eyes exist from flying particles.
(b) Suitable protective clothing to
cover those parts of the body exposed
to injury when handling corrosive or
toxic substances or other materials
which might cause injury to the skin.
(c) Protective gloves when handling
materials or performing work which
might cause injury to the hands; however, gloves shall not be worn where
they would create a greater hazard by
becoming entangled in the moving
parts of equipment.
(d) A suitable hard hat or hard cap. If
a hard hat or hard cap is painted, nonmetallic based paint shall be used.
(e) Suitable protective footwear.
[36 FR 19497, Oct. 7, 1971, as amended at 39 FR
7175, Feb. 25, 1974]
§ 75.1720–1 Distinctively colored hard
hats, or hard caps; identification for
newly
employed,
inexperienced
miners.
Hard hats or hard caps distinctively
different in color from those worn by
experienced miners shall be worn by
each newly employed, inexperienced
miner for at least one year from the
date of his initial employment as a
miner or until he has been qualified or
certified as a miner by the State in
which he is employed.
[39 FR 7175, Feb. 25, 1974]
§ 75.1721 Opening of new underground
coal mines, or reopening and reactivating of abandoned or deactivated
coal mines, notification by the operator; requirements.
(a) Each operator of a new underground coal mine, and a mine which
has been abandoned or deactivated and
is to be reopened or reactivated, shall
prior to opening, reopening or reactivating the mine notify the Coal Mine
Health and Safety District Manager for
the district in which the mine is located of the approximate date of the
proposed or actual opening of such
mine. Thereafter, and as soon as practicable, the operator of such mine shall
663
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00673
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
EC22OC91.023
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1720 Protective clothing; requirements.
§ 75.1721
§ 75.1722
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
submit all preliminary plans in accordance with paragraphs (b) and (c) of this
section to the District Manager and
the operator shall not develop any part
of the coalbed in such mine unless and
until all preliminary plans have been
approved.
(b) The preliminary plans required to
be submitted by the operator to the
District Manager shall be in writing
and shall contain the following:
(1) The name and location of the proposed mine and the Mine Safety and
Health Administration mine identification number, if known;
(2) The name and address of the mine
operator(s);
(3) The name and address of the principal official designated by the operator as the person who is in charge of
health and safety at the mine;
(4) The identification and approximate height of the coalbed to be developed;
(5) The system of mining to be employed;
(6) A proposed roof control plan containing the information specified in
§ 75.220.
(7) A proposed mine ventilation plan
containing the information specified in
§§ 75.371 and 75.372;
(8) A proposed plan for sealing
worked-out areas containing the information specified in §§ 75.371 and 75.372.
(9) A proposed program for searching
miners for smoking materials in accordance with the provisions of
§ 75.1702; and,
(10) A proposed plan for emergency
medical assistance and emergency
communication in accordance with the
provisions of §§ 75.1713–1 and 75.1713–2.
(c) The preliminary plans required to
be submitted by the operator to the
District Manager shall be in writing
and shall contain the following:
(1) The proposed training plan containing the information specified in
§§ 48.3 and 48.23 of this chapter, and
(2) A proposed plan for training and
retraining certified and qualified persons containing the information specified in § 75.160–1.
[44 FR 9380, Feb. 13, 1979, as amended at 47
FR 23641, May 28, 1982; 57 FR 20929, May 15,
1992]
§ 75.1722 Mechanical
guards.
(a) Gears; sprockets; chains; drive,
head,
tail,
and
takeup
pulleys;
flywheels; couplings, shafts; sawblades;
fan inlets; and similar exposed moving
machine parts which may be contacted
by persons, and which may cause injury to persons shall be guarded.
(b) Guards at conveyor-drive, conveyor-head, and conveyor-tail pulleys
shall extend a distance sufficient to
prevent a person from reaching behind
the guard and becoming caught between the belt and the pulley.
(c) Except when testing the machinery, guards shall be securely in place
while machinery is being operated.
[38 FR 4976, Feb. 23, 1973]
§ 75.1723 Stationary
grinding
chines; protective devices.
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00674
Fmt 8010
ma-
(a) Stationary grinding machines
other than special bit grinders shall be
equipped with:
(1) Peripheral hoods (less than 90°
throat openings) capable of withstanding the force of a bursting wheel.
(2) Adjustable tool rests set as close
as practical to the wheel.
(3) Safety washers.
(b) Grinding wheels shall be operated
within the specifications of the manufacturer of the wheel.
(c) Face shields or goggles, in good
condition, shall be worn when operating a grinding wheel.
[38 FR 4976, Feb. 23, 1973]
§ 75.1724 Hand-held power tools; safety
devices.
Hand-held power tools shall be
equipped with controls requiring constant hand or finger pressure to operate the tools or shall be equipped with
friction or other equivalent safety devices.
[38 FR 4976, Feb. 23, 1973]
§ 75.1725 Machinery and equipment;
operation and maintenance.
(a) Mobile and stationary machinery
and equipment shall be maintained in
safe operating condition and machinery or equipment in unsafe condition
shall be removed from service immediately.
664
VerDate Sep<11>2014
equipment
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1731
(b) Machinery and equipment shall be
operated only by persons authorized to
operate such machinery or equipment.
(c) Repairs or maintenance shall not
be performed on machinery until the
power is off and the machinery is
blocked against motion, except where
machinery motion is necessary to
make adjustments.
(d) Machinery shall not be lubricated
manually while in motion, unless
equipped with extended fittings or
cups.
§ 75.1729 Welding operations.
Welding operations shall be shielded
and the area shall be well ventilated.
[38 FR 4976, Feb. 23, 1973]
§ 75.1726 Performing work from a
raised position; safeguards.
(a) Men shall not work on or from a
piece of mobile equipment in a raised
position until it has been blocked in
place securely. This does not preclude
the use of equipment specifically designed as elevated mobile work platforms.
(b) No work shall be performed under
machinery or equipment that has been
raised until such machinery or equipment has been securely blocked in position.
[38 FR 4976, Feb. 23, 1973]
§ 75.1727 Drive belts.
(a) Drive belts shall not be shifted
while in motion unless the machines
are provided with mechanical shifters.
(b) Belt dressing shall not be applied
while belts are in motion except where
it can be applied without endangering a
person.
kpayne on VMOFRWIN702 with $$_JOB
[38 FR 4976, Feb. 23, 1973]
§ 75.1728 Power-driven pulleys.
(a) Belts, chains, and ropes shall not
be guided onto power-driven moving
pulleys, sprockets, or drums with the
hands except on slow-moving equipment especially designed for hand feeding.
(b) Pulleys of conveyors shall not be
cleaned manually while the conveyor is
in motion.
(c) Coal spilled beneath belt conveyor
drives or tail pieces shall not be removed while the conveyor is in motion,
except where such coal can be removed
without endangering persons.
[38 FR 4976, Feb. 23, 1973]
[38 FR 4976, Feb. 23, 1973]
§ 75.1730 Compressed
air;
general;
compressed air systems.
(a) All pressure vessels shall be constructed, installed, and maintained in
accordance with the standards and
specifications of Section VIII ‘‘Unfired
Pressure Vessels,’’ of the American Society of Mechanical Engineers Boiler
and Pressure Vessel Code (1971), which
is hereby incorporated by reference and
made a part hereof. This document
may be purchased from the American
Society of Mechanical Engineers, 22
Law Drive, P.O. Box 2900, Fairfield,
New Jersey 07007, Phone: 800–843–2763
(toll free); http://www.asme.org; and it is
available for examination in every
MSHA Coal Mine Safety and Health
district office.
(b) Compressors and compressed-air
receivers shall be equipped with automatic pressure-relief valves, pressure
gages, and drain valves.
(c) Repairs involving the pressure
system of compressors, receivers, or
compressed-air-powered
equipment
shall not be attempted until the pressure has been relieved from that part of
the system to be repaired.
(d) At no time shall compressed air
be directed toward a person. When
compressed air is used, all necessary
precautions shall be taken to protect
persons from injury.
(e) Safety chains, suitable locking
devices, or automatic cut-off valves
shall be used at connections to machines of high-pressure hose lines of
three-fourths of an inch inside diameter or larger, and between high-pressure hose lines of three-fourths of an
inch inside diameter or larger, where a
connection failure would create a hazard. For purposes of this paragraph,
high-pressure means pressure of 100
p.s.i. or more.
[38 FR 4976, Feb. 23, 1973, as amended at 71
FR 16669, Apr. 3, 2006]
§ 75.1731 Maintenance of belt conveyors and belt conveyor entries.
(a) Damaged rollers, or other damaged belt conveyor components, which
665
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00675
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1732
30 CFR Ch. I (7–1–19 Edition)
pose a fire hazard must be immediately
repaired or replaced. All other damaged rollers, or other damaged belt
conveyor components, must be repaired
or replaced.
(b) Conveyor belts must be properly
aligned to prevent the moving belt
from rubbing against the structure or
components.
(c) Materials shall not be allowed in
the belt conveyor entry where the material may contribute to a frictional
heating hazard.
(d) Splicing of any approved conveyor
belt must maintain flame-resistant
properties of the belt.
[73 FR 80616, Dec. 31, 2008]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1732
Proximity detection systems.
Operators must install proximity detection systems on certain mobile machines.
(a) Machines covered. Operators must
equip continuous mining machines, except full-face continuous mining machines, with proximity detection systems by the following dates. For proximity detection systems with minerwearable components, the mine operator must provide a miner-wearable
component to be worn by each miner
on the working section by the following dates.
(1) Continuous mining machines
manufactured after March 16, 2015 must
meet the requirements in this section
no later than November 16, 2015. These
machines must meet the requirements
in this section when placed in service
with a proximity detection system.
(2) Continuous mining machines
manufactured and equipped with a
proximity detection system on or before March 16, 2015 must meet the requirements in this section no later
than September 16, 2016.
(3) Continuous mining machines
manufactured and not equipped with a
proximity detection system on or before March 16, 2015 must meet the requirements in this section no later
than March 16, 2018. These machines
must meet the requirements in this
section when placed in service with a
proximity detection system.
(b) Requirements for a proximity detection system. A proximity detection system includes machine-mounted compo-
nents and miner-wearable components.
The system must:
(1) Cause a machine, which is
tramming from place-to-place or repositioning, to stop before contacting a
miner except for a miner who is in the
on-board operator’s compartment;
(2) Provide an audible and visual
warning signal on the miner-wearable
component and a visual warning signal
on the machine that alert miners before the system causes a machine to
stop. These warning signals must be
distinguishable from other signals;
(3) Provide a visual signal on the machine that indicates the machinemounted components are functioning
properly;
(4) Prevent movement of the machine
if any machine-mounted component of
the system is not functioning properly.
However, a system with any machinemounted component that is not functioning properly may allow machine
movement if it provides an audible or
visual warning signal, distinguishable
from other signals, during movement.
Such movement is permitted only for
purposes of relocating the machine
from an unsafe location for repair;
(5) Be installed to prevent interference that adversely affects performance of any electrical system; and
(6) Be installed and maintained in
proper operating condition by a person
trained in the installation and maintenance of the system.
(c) Proximity detection system checks.
Operators must:
(1) Designate a person who must perform a check of machine-mounted components of the proximity detection system to verify that components are intact, that the system is functioning
properly, and take action to correct defects—
(i) At the beginning of each shift
when the machine is to be used; or
(ii) Immediately prior to the time
the machine is to be operated if not in
use at the beginning of a shift; or
(iii) Within 1 hour of a shift change if
the shift change occurs without an
interruption in production.
(2) Check for proper operation of
miner-wearable components at the beginning of each shift that the components are to be used and correct defects
before the components are used.
666
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00676
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1901
(d) Certifications and records. The operator must make and retain certifications and records as follows:
(1) At the completion of the check of
machine-mounted components required
under paragraph (c)(1) of this section, a
certified person under § 75.100 must certify by initials, date, and time that the
check was conducted. Defects found as
a result of the check, including corrective actions and dates of corrective actions, must be recorded before the end
of the shift;
(2) Make a record of the defects found
as a result of the check of miner-wearable components required under paragraph (c)(2) of this section, including
corrective actions and dates of corrective actions;
(3) Make a record of the persons
trained in the installation and maintenance of proximity detection systems
required under paragraph (b)(6) of this
section;
(4) Maintain records in a secure book
or electronically in a secure computer
system not susceptible to alteration;
and
(5) Retain records for at least one
year and make them available for inspection by authorized representatives
of the Secretary and representatives of
miners.
E119–88 ‘‘Standard Test Methods for
Fire Tests of Building Construction
and Materials’’ is incorporated by reference and may be inspected at any
MSHA Coal Mine Safety and Health
District Office; at MSHA’s Office of
Standards, Regulations, and Variances,
201 12th Street South, Arlington, VA
22202–5452; 202–693–9440; or at the National Archives and Records Administration (NARA). For information on
the availability of this material at
NARA, call 202–741–6030, or go to: http://
www.archives.gov/federallregister/
codeloflfederallregulations/
ibrllocations.html. This incorporation
by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. In addition, copies of the document may be purchased from the
American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive,
P.O. Box C700, West Conshohocken, PA,
19428–2959;
610–832–9500;
http://
www.astm.org.
Permanent underground diesel fuel storage facility. A facility designed and constructed to remain at one location for
the storage or dispensing of diesel fuel,
which does not move as mining progresses.
Safety can. A metal container intended for storage, transport or dispensing of diesel fuel, with a nominal
capacity of 5 gallons, listed or approved
by a nationally recognized independent
testing laboratory.
Temporary underground diesel fuel storage area. An area of the mine provided
for the short-term storage of diesel fuel
in a fuel transportation unit, which
moves as mining progresses.
[80 FR 2202, Jan. 15, 2015]
Subpart S [Reserved]
Subpart T—Diesel-Powered
Equipment
kpayne on VMOFRWIN702 with $$_JOB
SOURCE: 61 FR 55527, Oct. 25, 1996, unless
otherwise noted.
§ 75.1900 Definitions.
The following definitions apply in
this subpart.
Diesel fuel tank. A closed metal vessel
specifically designed for the storage or
transport of diesel fuel.
Diesel fuel transportation unit. A selfpropelled or portable wheeled vehicle
used to transport a diesel fuel tank.
Noncombustible material. A material
that will continue to serve its intended
function for 1 hour when subjected to a
fire test incorporating an ASTM E119–
88 time/temperature heat input, or
equivalent. The publication ASTM
[35 FR 17890, Nov. 20, 1970, as amended at 67
FR 38386, June 4, 2002; 71 FR 16669, Apr. 3,
2006; 80 FR 52992, Sept. 2, 2015]
§ 75.1901 Diesel fuel requirements.
(a) Diesel-powered equipment shall
be used underground only with a diesel
fuel having a sulfur content no greater
than 0.05 percent and a flash point of
100 °F (38 °C) or greater. Upon request,
the mine operator shall provide to an
authorized representative of the Secretary evidence that the diesel fuel
purchased for use in diesel-powered
equipment underground meets these requirements.
667
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00677
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1902
30 CFR Ch. I (7–1–19 Edition)
(b) Flammable liquids shall not be
added to diesel fuel used in diesel-powered equipment underground.
(c) Only diesel fuel additives that
have been registered by the Environmental Protection Agency may be used
in diesel-powered equipment underground.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1902 Underground diesel fuel storage—general requirements.
(a) All diesel fuel must be stored in:
(1) Diesel fuel tanks in permanent
underground diesel fuel storage facilities;
(2) Diesel fuel tanks on diesel fuel
transportation units in permanent underground diesel fuel storage facilities
or in temporary underground fuel storage areas; or
(3) Safety cans.
(b) The total capacity of stationary
diesel fuel tanks in permanent underground diesel fuel storage facilities
must not exceed 1000 gallons.
(c)(1) Only one temporary underground diesel fuel storage area is permitted for each working section or in
each area of the mine where equipment
is being installed or removed.
(2) The temporary underground diesel
fuel storage area must be located—
(i) Within 500 feet of the loading
point;
(ii) Within 500 feet of the projected
loading point where equipment is being
installed; or
(iii) Within 500 feet of the last loading point where equipment is being removed.
(3) No more than one diesel fuel
transportation unit at a time shall be
parked in the temporary underground
diesel fuel storage area.
(d) Permanent underground diesel
fuel storage facilities and temporary
underground diesel fuel storage areas
must be—
(1) At least 100 feet from shafts,
slopes, shops, or explosives magazines;
(2) At least 25 feet from trolley wires
or power cables, or electric equipment
not necessary for the operation of the
storage facilities or areas; and
(3) In a location that is protected
from damage by other mobile equipment.
(e) Permanent underground diesel
fuel storage facilities must not be located within the primary escapeway.
§ 75.1903 Underground diesel fuel storage facilities and areas; construction and safety precautions.
(a) Permanent underground diesel
fuel storage facilities must be—
(1) Constructed of noncombustible
materials, including floors, roofs, roof
supports, doors, and door frames. Exposed coal within fuel storage areas
must be covered with noncombustible
materials. If bulkheads are used they
must be tightly sealed and must be
built of or covered with noncombustible materials;
(2) Provided with either self-closing
doors or a means for automatic enclosure;
(3) Provided with a means for personnel to enter and exit the facility
after closure;
(4) Ventilated with intake air that is
coursed into a return air course or to
the surface and that is not used to ventilate working places, using ventilation controls meeting the requirements
of § 75.333(e);
(5) Equipped with an automatic fire
suppression system that meets the requirements of § 75.1912. Actuation of
the automatic fire suppression system
shall initiate the means for automatic
enclosure;
(6) Provided with a means of containment capable of holding 150 percent of
the maximum capacity of the fuel storage system; and
(7) Provided with a competent concrete floor or equivalent to prevent
fuel spills from saturating the mine
floor.
(b) Permanent underground diesel
fuel storage facilities and temporary
underground diesel fuel storage areas
must be—
(1) Equipped with at least 240 pounds
of rock dust and provided with two
portable multipurpose dry chemical
type (ABC) fire extinguishers that are
listed or approved by a nationally recognized independent testing laboratory
and have a 10A:60B:C or higher rating.
Both fire extinguishers must be easily
accessible to personnel, and at least
one fire extinguisher must be located
668
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00678
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1904
outside of the storage facility or area
upwind of the facility, in intake air; or
(2) Provided with three portable multipurpose dry chemical type (ABC) fire
extinguishers that are listed or approved by a nationally recognized independent testing laboratory and have a
10A:60B:C or higher rating. All fire extinguishers must be easily accessible to
personnel, and at least one fire extinguisher must be located outside of the
storage facility or area upwind of the
facility, in intake air.
(3) Identified with conspicuous markings designating diesel fuel storage;
and
(4) Maintained to prevent the accumulation of water.
(c) Welding or cutting other than
that performed in accordance with
paragraph (d) of this section shall not
be performed within 50 feet of a permanent underground diesel fuel storage
facility or a temporary underground
diesel fuel storage area.
(d) When it is necessary to weld, cut,
or solder pipelines, tanks, or other containers that may have contained diesel
fuel, these practices shall be followed:
(1) Cutting or welding shall not be
performed on or within pipelines,
tanks, or other containers that have
contained diesel fuel until they have
been thoroughly purged and cleaned or
inerted and a vent or opening is provided to allow for sufficient release of
any buildup pressure before heat is applied.
(2) Diesel fuel shall not be allowed to
enter pipelines, tanks, or containers
that have been welded, soldered,
brazed, or cut until the metal has
cooled to ambient temperature.
structed of noncombustible material so
that the tanks are at least 12 inches
above the floor.
(b) Underground diesel fuel tanks
must be provided with—
(1) Devices for emergency venting designed to open at a pressure not to exceed 2.5 psi according to the following—
(i) Tanks with a capacity greater
than 500 gallons must have an emergency venting device whose area is
equivalent to a pipe with a nominal inside diameter of 5 inches or greater;
and
(ii) Tanks with a capacity of 500 gallons or less must have an emergency
venting device whose area is equivalent
to a pipe with a nominal inside diameter of 4 inches or greater.
(2) Tethered or self-closing caps for
stationary tanks in permanent underground diesel fuel storage facilities and
self-closing caps for diesel fuel tanks
on diesel fuel transportation units;
(3) Vents to permit the free discharge
of liquid, at least as large as the fill or
withdrawal connection, whichever is
larger, but not less than 11⁄4 inch nominal inside diameter;
(4) Liquid tight connections for all
tank openings that are—
(i) Identified by conspicuous markings that specify the function; and
(ii) Closed when not in use.
(5) Vent pipes that drain toward the
tank without sagging and are higher
than the fill pipe opening;
(6) Shutoff valves located as close as
practicable to the tank shell on each
connection through which liquid can
normally flow; and
(7) An automatic closing, heat-actuated valve on each withdrawal connection below the liquid level.
(c) When tanks are provided with
openings for manual gauging, liquid
tight, tethered or self-closing caps or
covers must be provided and must be
kept closed when not open for gauging.
(d) Surfaces of the tank and its associated components must be protected
against damage by collision.
(e) Before being placed in service,
tanks and their associated components
must be tested for leakage at a pressure equal to the working pressure, except tanks and components connected
directly to piping systems, which must
§ 75.1904 Underground
diesel
fuel
tanks and safety cans.
(a) Diesel fuel tanks used underground shall—
(1) Have steel walls of a minimum 3⁄16inch thickness, or walls made of other
metal of a thickness that provides
equivalent strength;
(2) Be protected from corrosion;
(3) Be of seamless construction or
have liquid tight welded seams;
(4) Not leak; and
(5) For stationary tanks in permanent underground diesel fuel storage
facilities, be placed on supports con-
669
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00679
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1905
30 CFR Ch. I (7–1–19 Edition)
be properly designed for the application.
(f) Safety cans must be:
(1) Limited to a nominal capacity of
5 gallons or less;
(2) Equipped with a flexible or rigid
tubular nozzle attached to a valved
spout;
(3) Provided with a vent valve designed to open and close simultaneously and automatically with the
opening and closing of the pouring
valve; and
(4) Designed so that they will safely
relieve internal pressure when exposed
to fire.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1905 Dispensing of diesel fuel.
(a) Diesel-powered equipment in underground coal mines may be refueled
only from safety cans, from tanks on
diesel fuel transportation units, or
from stationary tanks.
(b) Fuel that is dispensed from other
than safety cans must be dispensed by
means of—
(1) Gravity feed with a hose equipped
with a nozzle with a self-closing valve
and no latch-open device;
(2) A manual pump with a hose
equipped with a nozzle containing a
self-closing valve; or
(3) A powered pump with:
(i) An accessible emergency shutoff
switch for each nozzle;
(ii) A hose equipped with a self-closing valve and no latch-open device; and
(iii) An anti-siphoning device.
(c) Diesel fuel must not be dispensed
using compressed gas.
(d) Diesel fuel must not be dispensed
to the fuel tank of diesel-powered
equipment while the equipment engine
is running.
(e) Powered pumps shall be shut off
when fuel is not being dispensed.
§ 75.1905–1 Diesel fuel piping systems.
(a) Diesel fuel piping systems from
the surface must be designed and operated as dry systems, unless an automatic shutdown is incorporated that
prevents accidental loss or spillage of
fuel and that activates an alarm system.
(b) All piping, valves and fittings
must be—
(1) Capable of withstanding working
pressures and stresses;
(2) Capable of withstanding four
times the static pressures;
(3) Compatible with diesel fuel; and
(4) Maintained in a manner that prevents leakage.
(c) Pipelines must have manual shutoff valves installed at the surface filling point, and at the underground discharge point.
(d) If diesel fuel lines are not buried
in the ground sufficiently to protect
them from damage, shutoff valves must
be located every 300 feet.
(e) Shutoff valves must be installed
at each branch line where the branch
line joins the main line.
(f) An automatic means must be provided to prevent unintentional transfer
of diesel fuel from the surface into the
permanent underground diesel fuel
storage facility.
(g) Diesel fuel piping systems from
the surface shall only be used to transport diesel fuel directly to stationary
tanks or diesel fuel transportation
units in a permanent underground diesel fuel storage facility.
(h) The diesel fuel piping system
must not be located in a borehole with
electric power cables.
(i) Diesel fuel piping systems located
in entries must not be located on the
same side of the entry as electric cables or power lines. Where it is necessary for piping systems to cross electric cables or power lines, guarding
must be provided to prevent severed
electrical cables or power lines near
broken fuel lines.
(j) Diesel fuel piping systems must be
protected and located to prevent physical damage.
§ 75.1906
Transport of diesel fuel.
(a) Diesel fuel shall be transported
only by diesel fuel transportation units
or in safety cans.
(b) No more than one safety can shall
be transported on a vehicle at any
time. The can must be protected from
damage during transport. All other
safety cans must be stored in permanent underground diesel fuel storage
facilities.
(c) Safety cans that leak must be
promptly removed from the mine.
670
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00680
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1908
(d) Diesel fuel transportation unit
tanks and safety cans must be conspicuously marked as containing diesel
fuel.
(e) Diesel fuel transportation units
must transport no more than 500 gallons of diesel fuel at a time.
(f) Tanks on diesel fuel transportation units must be permanently fixed
to the unit and have a total capacity of
no greater than 500 gallons of diesel
fuel.
(g) Non-self-propelled diesel fuel
transportation units with electrical
components for dispensing fuel that are
connected to a source of electrical
power must be protected by a fire suppression device that meets the requirements of §§ 75.1107–3 through 75.1107–6,
and §§ 75.1107–8 through 75.1107–16.
(h) Diesel fuel transportation units
and vehicles transporting safety cans
containing diesel fuel must have at
least two multipurpose, dry chemical
type (ABC) fire extinguishers, listed or
approved by a nationally recognized
independent testing laboratory and
having a 10A:60B:C or higher rating,
with one fire extinguisher provided on
each side of the vehicle.
(i) Diesel fuel transportation units
shall be parked only in permanent underground diesel fuel storage facilities
or temporary underground diesel fuel
storage areas when not in use.
(j) When the distance between a diesel fuel transportation unit and an energized trolley wire at any location is
less than 12 inches, the requirements of
§ 75.1003–2 must be followed.
(k) Diesel fuel shall not be transported on or with mantrips or on conveyor belts.
(l) Diesel fuel shall be stored and
handled in accordance with the requirements of §§ 75.1902 through 75.1906
of this part as of November 25, 1997.
(b) Diesel-powered equipment approved under part 36 of this chapter
must be provided with additional safety features in accordance with the following time schedule:
(1) As of April 25, 1997 the equipment
must have a safety component system
that limits surface temperatures to
those specified in subpart F of part 7 of
this title;
(2) As of November 25, 1999 the equipment must have an automatic or manual fire suppression system that meets
the requirements of § 75.1911 of this
part, and at least one portable multipurpose dry chemical type (ABC) fire
extinguisher, listed or approved by a
nationally
recognized
independent
testing laboratory and having a
10A:60B:C or higher rating. The fire extinguisher must be located within easy
reach of the equipment operator and be
protected from damage by collision.
(3) As of November 25, 1999 the equipment must have a brake system that
meets the requirements of § 75.1909
(b)(6), (b)(7), (b)(8), (c), (d), and (e);
(4) As of November 25, 1997 a particulate index and dilution air quantity
shall be determined for the equipment
in accordance with subpart E of part 7
of this chapter; and
(5) Permissible diesel-powered equipment manufactured on or after November 25, 1999 and that is used in an underground coal mine shall incorporate
a power package approved in accordance with part 7, subpart F of this
chapter.
(c) As of November 25, 1999 nonpermissible diesel-powered equipment,
except the special category of equipment under § 75.1908(d), shall meet the
requirements of §§ 75.1909 and 75.1910 of
this part.
[61 FR 55527, Oct. 25, 1996, as amended at 63
FR 12647, Mar. 16, 1998]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1907 Diesel-powered
equipment
intended for use in underground
coal mines.
(a) As of November 25, 1996 all dieselpowered equipment used where permissible electrical equipment is required
must be approved under part 36 of this
chapter.
§ 75.1908 Nonpermissible
diesel-powered equipment; categories.
(a) Heavy-duty diesel-powered equipment includes—
(1) Equipment that cuts or moves
rock or coal;
(2) Equipment that performs drilling
or bolting functions;
(3) Equipment that moves longwall
components;
(4) Self-propelled diesel fuel transportation units and self-propelled lube
units; or
671
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00681
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1909
30 CFR Ch. I (7–1–19 Edition)
(5) Machines used to transport portable diesel fuel transportation units or
portable lube units.
(b) Light-duty diesel-powered equipment is any diesel-powered equipment
that does not meet the criteria of paragraph (a).
(c) For the purposes of this subpart,
the following equipment is considered
attended:
(1) Any machine or device operated
by a miner; or
(2) Any machine or device that is
mounted in the direct line of sight of a
job site located within 500 feet of such
machine or device, which job site is occupied by a miner.
(d) Diesel-powered ambulances and
fire fighting equipment are a special
category of equipment that may be
used underground only in accordance
with the mine fire fighting and evacuation plan under § 75.1502.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 55527, Oct. 25, 1996; 70 FR 36347, June
23, 2005]
§ 75.1909 Nonpermissible
diesel-powered equipment; design and performance requirements.
(a) Nonpermissible diesel-powered
equipment, except for the special category of equipment under § 75.1908(d),
must be equipped with the following
features:
(1) An engine approved under subpart
E of part 7 of this title equipped with
an air filter sized in accordance with
the
engine
manufacturer’s
recommendations, and an air filter service
indicator set in accordance with the
engine manufacturer’s recommendations;
(2) At least one portable multipurpose dry chemical type (ABC) fire extinguisher listed or approved by a nationally recognized independent testing laboratory with a 10A:60B:C or
higher rating. The fire extinguisher
must be located within easy reach of
the equipment operator and protected
from damage;
(3) A fuel system specifically designed for diesel fuel meeting the following requirements:
(i) A fuel tank and fuel lines that do
not leak;
(ii) A fuel tank that is substantially
constructed and protected against
damage by collision;
(iii) A vent opening that maintains
atmospheric pressure in the fuel tank,
and that is designed to prevent fuel
from splashing out of the vent opening;
(iv) A self-closing filler cap on the
fuel tank;
(v) The fuel tank, filler and vent
must be located so that leaks or spillage during refueling will not contact
hot surfaces;
(vi) Fuel line piping must be either
steel-wire reinforced; synthetic elastomer-covered hose suitable for use
with diesel fuel that has been tested
and has been determined to be fire-resistant by the manufacturer; or metal;
(vii) Fuel line piping must be
clamped;
(viii) Primary fuel lines must be located so that fuel line leaks do not contact hot surfaces;
(ix) The fuel lines must be separated
from electrical wiring and protected
from damage in ordinary use;
(x) A manual shutoff valve must be
installed in the fuel system as close as
practicable to the tank; and
(xi) A water separator and fuel filter(s) must be provided.
(4) A sensor to monitor the temperature and provide a visual warning of an
overheated cylinder head on air-cooled
engines;
(5) Guarding to protect fuel, hydraulic, and electric lines when such lines
pass near rotating parts or in the event
of shaft failure;
(6) Hydraulic tanks, fillers, vents,
and lines located to prevent spillage or
leaks from contacting hot surfaces;
(7) Reflectors or warning lights
mounted on the equipment which can
be readily seen in all directions;
(8) A means to direct exhaust gas
away from the equipment operator,
persons on board the machine, and
combustible machine components;
(9) A means to prevent unintentional
free and uncontrolled descent of personnel-elevating work platforms; and
(10) A means to prevent the spray
from ruptured hydraulic or lubricating
oil lines from being ignited by contact
with engine exhaust system component
surfaces.
(b) Self-propelled nonpermissible diesel-powered equipment must have the
following features in addition to those
in paragraph (a):
672
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00682
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
kpayne on VMOFRWIN702 with $$_JOB
Mine Safety and Health Admin., Labor
§ 75.1909
(1) A means to ensure that no stored
hydraulic energy that will cause machine articulation is available after the
engine is shut down;
(2) A neutral start feature which ensures that engine cranking torque will
not be transmitted through the
powertrain and cause machine movement on vehicles utilizing fluid power
transmissions;
(3) For machines with steering
wheels, brake pedals, and accelerator
pedals, controls which are of automobile orientation;
(4) An audible warning device conveniently located near the equipment operator;
(5) Lights provided and maintained
on both ends of the equipment. Equipment normally operated in both directions must be equipped with headlights
for both directions;
(6) Service brakes that act on each
wheel of the vehicle and that are designed such that failure of any single
component, except the brake actuation
pedal or other similar actuation device, must not result in a complete loss
of service braking capability;
(7) Service brakes that safely bring
the fully loaded vehicle to a complete
stop on the maximum grade on which
it is operated; and
(8) No device that traps a column of
fluid to hold the brake in the applied
position shall be installed in any brake
system, unless the trapped column of
fluid is released when the equipment
operator is no longer in contact with
the brake activation device.
(c)
Self-propelled
nonpermissible
heavy-duty diesel-powered equipment
under § 75.1908(a), except rail-mounted
equipment, shall be provided with a
supplemental braking system that:
(1) Engages automatically within 5
seconds of the shutdown of the engine;
(2) Safely brings the equipment when
fully loaded to a complete stop on the
maximum grade on which it is operated;
(3) Holds the equipment stationary,
despite any contraction of brake parts,
exhaustion of any nonmechanical
source of energy, or leakage;
(4) Releases only by a manual control
that does not operate any other equipment function;
(5) Has a means in the equipment operator’s compartment to apply the
brakes manually without shutting
down the engine, and a means to release and reengage the brakes without
the engine operating; and
(6) Has a means to ensure that the
supplemental braking system is released before the equipment can be
trammed, and is designed to ensure the
brake is fully released at all times
while the equipment is trammed.
(d)
Self-propelled
nonpermissible
light-duty diesel-powered equipment
under § 75.1908(b), except rail-mounted
equipment, must be provided with a
parking brake that holds the fully
loaded equipment stationary on the
maximum grade on which it is operated
despite any contraction of the brake
parts, exhaustion of any nonmechanical source of energy, or leakage.
(e) The supplemental and park brake
systems required by paragraphs (c) and
(d) must be applied when the equipment operator is not at the controls of
the equipment, except during movement of disabled equipment.
(f) Self-propelled personnel-elevating
work platforms must be provided with
a means to ensure that the parking
braking system is released before the
equipment can be trammed, and must
be designed to ensure the brake is fully
released at all times while the equipment is trammed.
(g) Any nonpermissible equipment
that discharges its exhaust directly
into a return air course must be provided with a power package approved
under subpart F of part 7 of this title.
(h)
Self-propelled
nonpermissible
heavy-duty diesel-powered equipment
meeting the requirements of § 75.1908(a)
must be provided with an automatic
fire suppression system meeting the requirements of § 75.1911.
(i)
Self-propelled
nonpermissible
light-duty diesel-powered equipment
meeting the requirements of § 75.1908(b)
must be provided with an automatic or
manual fire suppression system meeting the requirements of § 75.1911.
(j) Nonpermissible equipment that is
not self-propelled must have the following features in addition to those
listed in paragraph (a):
673
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00683
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1910
30 CFR Ch. I (7–1–19 Edition)
(1) A means to prevent inadvertent
movement of the equipment when
parked;
(2) Safety chains or other suitable
secondary connections on equipment
that is being towed; and
(3) An automatic fire suppression system meeting the requirements of
§ 75.1911.
kpayne on VMOFRWIN702 with $$_JOB
[61 FR 55527, Oct. 25, 1996; 62 FR 34641, June
27, 1997]
§ 75.1910 Nonpermissible
diesel-powered equipment; electrical system
design and performance requirements.
Electrical circuits and components
associated with or connected to electrical systems on nonpermissible diesel-powered equipment utilizing storage batteries and integral charging
systems, except for the special category of equipment under § 75.1908(d),
must conform to the following requirements:
(a) Overload and short circuit protection must be provided for electric circuits and components in accordance
with §§ 75.518 and 75.518–1 of this part;
(b) Each electric conductor from the
battery to the starting motor must be
protected against short circuit by fuses
or other circuit-interrupting devices
placed as near as practicable to the
battery terminals;
(c) Each branch circuit conductor
connected to the main circuit between
the battery and charging generator
must be protected against short circuit
by fuses or other automatic circuit-interrupting devices;
(d) The electrical system shall be
equipped with a circuit-interrupting
device by means of which all power
conductors can be deenergized. The device must be located as close as practicable to the battery terminals and be
designed to operate within its electrical rating without damage. The device shall not automatically reset after
being actuated. All magnetic circuitinterrupting devices must be mounted
in a manner to preclude their closing
by force of gravity;
(e) Each motor and charging generator must be protected by an automatic overcurrent device. One protective device will be acceptable when two
motors of the same rating operate si-
multaneously and perform virtually
the same duty;
(f) Each ungrounded conductor must
have insulation compatible with the
impressed voltage. Insulation materials must be resistant to deterioration
from engine heat and oil. Electric conductors must meet the applicable requirements of §§ 75.513 and 75.513–1, except electric conductors for starting
motors, which must only meet the requirements of § 75.513;
(g) All wiring must have adequate
mechanical protection to prevent damage to the cable that might result in
short circuits;
(h) Sharp edges and corners must be
removed at all points where there is a
possibility of damaging wires, cables,
or conduits by cutting or abrasion. The
insulation of the cables within a battery box must be protected against abrasion;
(i) When insulated wires other than
cables pass through metal frames, the
holes must be substantially bushed
with insulated bushings. Cables must
enter metal frames of motors, splice
boxes, and electric components only
through proper fittings. All electrical
connections and splices must be mechanically and electrically efficient,
and suitable connectors shall be used.
All electrical connectors or splices in
insulated wire must be reinsulated at
least to the same degree of protection
as the remainder of the wire;
(j) The battery must be secured to
prevent movement, and must be protected from external damage by position. Batteries that are not protected
from external damage by position must
be enclosed in a battery box. Flame-resistant insulation treated to resist
chemical reaction to electrolyte must
be provided on battery connections to
prevent battery terminals from contacting conducting surfaces;
(k) A battery box, including the
cover, must be constructed of steel
with a minimum thickness of 1⁄8 inch,
or of a material other than steel that
provides equivalent strength;
(l) Battery-box covers must be lined
with a flame-resistant insulating material permanently attached to the underside of the cover, unless equivalent
protection is provided. Battery-box
covers must be provided with a means
674
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00684
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1911
for securing them in closed position. At
least 1⁄2 inch of air space must be provided between the underside of the
cover and the top of the battery, including terminals;
(m) Battery boxes must be provided
with ventilation openings to prevent
the accumulation of flammable or
toxic gases or vapors within the battery box. The size and locations of
openings for ventilation must prevent
direct access to battery terminals;
(n) The battery must be insulated
from the battery-box walls and supported on insulating materials. Insulating materials that may be subject to
chemical reaction with electrolyte
must be treated to resist such action;
and
(o) Drainage holes must be provided
in the bottom of each battery box.
and battery areas on diesel-powered
equipment and electric panels or controls used on fuel transportation units
and other areas as necessary.
(c) If automatic, the fire suppression
system shall include audible and visual
alarms to warn of fires or system
faults.
(d) The fire suppression system shall
provide for automatic engine shutdown. If the fire suppression system is
automatic, engine shutdown and discharge of suppressant agent may be delayed for a maximum of 15 seconds
after the fire is detected by the system.
(e) The fire suppression system shall
be operable by at least two manual actuators. One actuator shall be located
on each side of the equipment. If the
equipment is provided with an operator’s compartment, one of the manual
actuators shall be located in the compartment within reach of the operator.
(f) The fire suppression system shall
remain operative in the event of engine
shutdown, equipment electrical system
failure, or failure of any other equipment system.
(g) The electrical components of each
fire suppression system installed on
equipment used where permissible electric equipment is required shall be permissible or intrinsically safe and such
components shall be maintained in permissible or intrinsically safe condition.
(h) Electrically operated detection
and actuation circuits shall be monitored and provided with status indicators showing power and circuit continuity. If the system is not electrically operated, a means shall be provided to indicate the functional readiness status of the detection system.
(i) Each fire suppression system shall
be tested and maintained in accordance
with the manufacturer’s recommended
inspection and maintenance program
and as required by the nationally recognized independent testing laboratory
listing or approval, and be visually inspected at least once each week by a
person trained to make such inspections.
(j) Recordkeeping. Persons performing
inspections and tests of fire suppression systems under paragraph (i) shall
record when a fire suppression system
does not meet the installation or maintenance requirements of this section.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1911 Fire suppression systems for
diesel-powered equipment and fuel
transportation units.
(a) The fire suppression system required by §§ 75.1907 and 75.1909 shall be a
multipurpose dry chemical type (ABC)
fire suppression system listed or approved by a nationally recognized independent testing laboratory and appropriate for installation on diesel-powered equipment and fuel transportation
units.
(1) The system shall be installed in
accordance with the manufacturer’s
specifications and the limitations of
the listing or approval.
(2) The system shall be installed in a
protected location or guarded to minimize physical damage from routine vehicle operations.
(3) Suppressant agent distribution
tubing or piping shall be secured and
protected against damage, including
pinching, crimping, stretching, abrasion, and corrosion.
(4) Discharge nozzles shall be positioned and aimed for maximum fire
suppression effectiveness. Nozzles shall
also be protected against the entrance
of foreign materials such as mud, coal
dust, or rock dust.
(b) The fire suppression system shall
provide fire suppression and, if automatic, fire detection for the engine including the starter, transmission, hydraulic pumps and tanks, fuel tanks,
exposed brake units, air compressors
675
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00685
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1912
30 CFR Ch. I (7–1–19 Edition)
(1) The record shall include the
equipment on which the fire suppression system did not meet the installation or maintenance requirements of
this section, the defect found, and the
corrective action taken.
(2) Records are to be kept manually
in a secure manner not susceptible to
alteration or recorded electronically in
a secured computer system that is not
susceptible to alteration.
(3) Records shall be maintained at a
surface location at the mine for one
year and made available for inspection
by an authorized representative of the
Secretary and miners’ representatives.
(k) All miners normally assigned to
the active workings of the mine shall
be instructed about the hazards inherent to the operation of the fire suppression systems and, where appropriate,
the safeguards available for each system.
(l) For purposes of § 75.380(f), a fire
suppression system installed on dieselpowered equipment and meeting the requirements of this section is equivalent
to a fire suppression system meeting
the requirements of §§ 75.1107–3 through
75.1107–16.
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1912 Fire suppression systems for
permanent underground diesel fuel
storage facilities.
(a) The fire suppression system required by § 75.1903 shall be an automatic multipurpose dry chemical type
(ABC) fire suppression system listed or
approved as an engineered dry chemical extinguishing system by a nationally recognized independent testing
laboratory and appropriate for installation at a permanent underground diesel
fuel storage facility.
(1) Alternate types of fire suppression
systems shall be approved in accordance with § 75.1107–13 of this part.
(2) The system shall be installed in
accordance with the manufacturer’s
specifications and the limitations of
the listing or approval.
(3) The system shall be installed in a
protected location or guarded to prevent physical damage from routine operations.
(4) Suppressant agent distribution
tubing or piping shall be secured and
protected against damage, including
pinching, crimping, stretching, abrasion, and corrosion.
(5) Discharge nozzles shall be positioned and aimed for maximum fire
suppression effectiveness in the protected areas. Nozzles must also be protected against the entrance of foreign
materials such as mud, coal dust, and
rock dust.
(b) The fire suppression system shall
provide automatic fire detection and
automatic fire suppression for all areas
within the facility.
(c) Audible and visual alarms to warn
of fire or system faults shall be provided at the protected area and at a
surface location which is continually
monitored by a person when personnel
are underground. In the event of a fire,
personnel shall be warned in accordance with the provisions set forth in
§ 75.1502.
(d) The fire suppression system shall
deenergize all power to the diesel fuel
storage facility when actuated except
that required for automatic enclosure
and alarms.
(e) Fire suppression systems shall include two manual actuators located as
follows:
(1) At least one within the fuel storage facility; and
(2) At least one a safe distance away
from the storage facility and located in
intake air, upwind of the storage facility.
(f) The fire suppression system shall
remain operational in the event of
electrical system failure.
(g) Electrically operated detection
and actuation circuits shall be monitored and provided with status indicators showing power and circuit continuity. If the system is not electrically operated, a means shall be provided to indicate the functional readiness status of the detection system.
(h) Each fire suppression system
shall be tested and maintained in accordance with the manufacturer’s recommended inspection and maintenance
program and as required by the nationally recognized independent testing
laboratory listing or approval, and be
visually inspected at least once each
week by a person trained to make such
inspections.
676
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00686
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
§ 75.1914
(i) Recordkeeping. Persons performing
inspections and tests of fire suppression systems under paragraph (h) shall
record when a fire suppression system
does not meet the installation or maintenance requirements of this section.
(1) The record shall include the facility whose fire suppression system did
not meet the installation or maintenance requirements of this section, the
defect found, and the corrective action
taken.
(2) Records are to be kept manually
in a secure manner not susceptible to
alteration or recorded electronically in
a secured computer system that is not
susceptible to alteration.
(3) Records shall be maintained at a
surface location at the mine for one
year and made available for inspection
by an authorized representative of the
Secretary and miners’ representatives.
(j) All miners normally assigned to
the active workings of the mine shall
be instructed about the hazards inherent to the operation of the fire suppression systems and, where appropriate,
the safeguards available for each system.
(d) Compressed oxygen or compressed
flammable gases shall not be connected
to diesel air-start systems.
[61 FR 55527, Oct. 25, 1996; 70 FR 36347, June
23, 2005]
kpayne on VMOFRWIN702 with $$_JOB
§ 75.1913
Starting aids.
(a) Volatile fuel starting aids shall be
used in accordance with recommendations provided by the starting aid manufacturer, the engine manufacturer,
and the machine manufacturer.
(b) Containers of volatile fuel starting aids shall be conspicuously marked
to indicate the contents. When not in
use, containers of volatile fuel starting
aids shall be stored in metal enclosures
that are used only for storage of starting aids. Such metal enclosures must
be conspicuously marked, secured, and
protected from damage.
(c) Volatile fuel starting aids shall
not be:
(1) Taken into or used in areas where
permissible equipment is required;
(2) Used in the presence of open
flames or burning flame safety lamps,
or when welding or cutting is taking
place; or
(3) Used in any area where 1.0 percent
or greater concentration of methane is
present.
§ 75.1914 Maintenance of diesel-powered equipment.
(a) Diesel-powered equipment shall
be maintained in approved and safe
condition or removed from service.
(b) Maintenance and repairs of approved features and those features required by §§ 75.1909 and 75.1910 on dieselpowered equipment shall be made only
by a person qualified under § 75.1915.
(c) The water scrubber system on diesel-powered equipment shall be drained
and flushed, by a person who is trained
to perform this task, at least once on
each shift in which the equipment is
operated.
(d) The intake air filter on dieselpowered equipment shall be replaced or
serviced, by a person who is trained to
perform this task, when the intake air
pressure drop device so indicates or
when the engine manufacturer’s maximum allowable air pressure drop level
is exceeded.
(e) Mobile diesel-powered equipment
that is to be used during a shift shall
be visually examined by the equipment
operator before being placed in operation. Equipment defects affecting
safety shall be reported promptly to
the mine operator.
(f) All diesel-powered equipment
shall be examined and tested weekly by
a person qualified under § 75.1915.
(1) Examinations and tests shall be
conducted in accordance with approved
checklists and manufacturers’ maintenance manuals.
(2) Persons performing weekly examinations and tests of diesel-powered
equipment under this paragraph shall
make a record when the equipment is
not in approved or safe condition. The
record shall include the equipment
that is not in approved or safe condition, the defect found, and the corrective action taken.
(g) Undiluted exhaust emissions of
diesel engines in diesel-powered equipment approved under part 36 and
heavy-duty nonpermissible diesel-powered equipment as defined in § 75.1908(a)
in use in underground coal mines shall
be tested and evaluated weekly by a
person who is trained to perform this
677
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00687
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
§ 75.1915
30 CFR Ch. I (7–1–19 Edition)
kpayne on VMOFRWIN702 with $$_JOB
task. The mine operator shall develop
and implement written standard operating procedures for such testing and
evaluation that specify the following:
(1) The method of achieving a repeatable loaded engine operating condition
for each type of equipment;
(2) Sampling and analytical methods
(including calibration of instrumentation) that are capable of accurately detecting carbon monoxide in the expected concentrations;
(3) The method of evaluation and interpretation of the results;
(4) The concentration or changes in
concentration of carbon monoxide that
will indicate a change in engine performance. Carbon monoxide concentration shall not exceed 2500 parts per million; and
(5) The maintenance of records necessary to track engine performance.
(h) Recordkeeping. Records required
by paragraphs (f)(2) and (g)(5) shall be—
(1) Recorded in a secure book that is
not susceptible to alteration, or recorded electronically in a computer
system that is secure and not susceptible to alteration; and
(2) Retained at a surface location at
the mine for at least 1 year and made
available for inspection by an authorized representative of the Secretary
and by miners’ representatives.
(i) Diesel-powered equipment must be
maintained in accordance with this
part as of November 25, 1997.
§ 75.1915 Training and qualification of
persons working on diesel-powered
equipment.
(a) To be qualified to perform maintenance, repairs, examinations and
tests on diesel-powered equipment, as
required by § 75.1914, a person must successfully complete a training and qualification program that meets the requirements of this section. A person
qualified to perform these tasks shall
be retrained as necessary to maintain
the ability to perform all assigned diesel-powered equipment maintenance,
repairs, examinations and tests.
(b) A training and qualification program under this section must:
(1) Be presented by a competent instructor;
(2) Be sufficient to prepare or update
a person’s ability to perform all as-
signed tasks with respect to dieselpowered equipment maintenance, repairs, examinations and tests;
(3) Address, at a minimum, the following:
(i) The requirements of subpart T of
this part;
(ii) Use of appropriate power package
or machine checklists to conduct tests
to ensure that diesel-powered equipment is in approved and safe condition,
with acceptable emission levels;
(iii) Proper maintenance of approved
features and the correct use of the appropriate maintenance manuals, including machine adjustments, service,
and assembly;
(iv) Diesel-powered equipment fire
suppression system tests and maintenance;
(v) Fire and ignition sources and
their control or elimination, including
cleaning of the equipment;
(vi) Safe fueling procedures and
maintenance of the fuel system of the
equipment; and
(vii) Intake air system maintenance
and tests.
(4) Include an examination that requires demonstration of the ability to
perform all assigned tasks with respect
to diesel-powered equipment maintenance, repairs, examinations and tests;
and
(5) Be in writing. The written program shall include a description of the
course content, materials, and teaching methods for initial training and retraining.
(c) Recordkeeping. The operator shall
maintain a copy of the training and
qualification program required by this
section and a record of the names of all
persons qualified under the program.
(1) The record of the names of qualified persons shall be made in a manner
that is not susceptible to alteration, or
recorded electronically in a computer
system that is secure and not susceptible to alteration.
(2) The training and qualification
program and record of qualified persons
are to be kept at surface location of
the mine and made available for inspection by an authorized representative of the Secretary and by miners’
representatives.
678
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00688
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
Mine Safety and Health Admin., Labor
Pt. 77
§ 75.1916 Operation of diesel-powered
equipment.
77.203 Use of material or equipment overhead; safeguards.
77.204 Openings in surface installations;
safeguards.
77.205 Travelways at surface installations.
77.206 Ladders; construction; installation
and maintenance.
77.207 Illumination.
77.208 Storage of materials.
77.209 Surge and storage piles.
77.210 Hoisting of materials.
77.211 Draw-off tunnels; stockpiling and reclaiming operations; general.
77.211–1 Continuous methane monitoring device; installation and operation; automatic deenergization of electric equipment.
77.212 Draw-off tunnel ventilation fans; installation.
77.213 Draw-off tunnel escapeways.
77.214 Refuse piles; general.
77.215 Refuse piles, construction requirements.
77.215–1 Refuse piles; identification.
77.215–2 Refuse piles; reporting requirements.
77.215–3 Refuse piles; certification.
77.215–4 Refuse piles; abandonment.
77.216 Water, sediment, or slurry impoundments and impounding structures; general.
77.216–1 Water, sediment or slurry impoundments and impounding structures; identification.
77.216–2 Water, sediment, or slurry impoundments and impounding structures;
minimum plan requirements; changes or
modifications; certification.
77.216–3 Water, sediment, or slurry impoundments and impounding structures;
inspection requirements; correction of
hazards; program requirements.
77.216–4 Water, sediment or slurry impoundments and impounding structures; reporting requirements; certification.
77.216–5 Water, sediment or slurry impoundments and impounding structures; abandonment.
77.217 Definitions.
(a) Diesel-powered equipment shall
be operated at a speed that is consistent with the type of equipment
being operated, roadway conditions,
grades, clearances, visibility, and other
traffic.
(b) Operators of mobile diesel-powered equipment shall maintain full
control of the equipment while it is in
motion.
(c) Standardized traffic rules, including speed limits, signals and warning
signs, shall be established at each mine
and followed.
(d) Except as required in normal mining operations, mobile diesel-powered
equipment shall not be idled.
(e) Diesel-powered equipment shall
not be operated unattended.
PART 77—MANDATORY SAFETY
STANDARDS, SURFACE COAL
MINES AND SURFACE WORK
AREAS OF UNDERGROUND COAL
MINES
Subpart A—General
Sec.
77.1 Scope.
77.2 Definitions.
Subpart B—Qualified and Certified Persons
77.100 Certified person.
77.101 Tests for methane and for oxygen deficiency; qualified person.
77.102 Tests for methane; oxygen deficiency;
qualified person, additional requirement.
77.103 Electrical work; qualified person.
77.104 Repair of energized surface high voltage lines; qualified person.
77.105 Qualified hoistman; slope or shaft
sinking operation; qualifications.
77.106 Records of certified and qualified persons.
77.107 Training programs.
77.107–1 Plans for training programs.
kpayne on VMOFRWIN702 with $$_JOB
Subpart C—Surface Installations
77.200 Surface installations; general.
77.201 Methane content in surface installations.
77.201–1 Tests for methane; qualified person;
use of approved device.
77.201–2 Methane accumulations; change in
ventilation.
77.202 Dust accumulations in surface installations.
Subpart D—Thermal Dryers
77.300 Thermal dryers; general.
77.301 Dryer heating units; operation.
77.302 Bypass stacks.
77.303 Hot gas inlet chamber dropout doors.
77.304 Explosion release vents.
77.305 Access to drying chambers, hot gas
inlet chambers and ductwork; installation and maintenance.
77.306 Fire protection.
77.307 Thermal dryers; location and installation; general.
77.308 Structures housing other facilities;
use of partitions.
77.309 Visual check of system equipment.
77.309–1 Control stations; location.
679
VerDate Sep<11>2014
18:09 Aug 16, 2019
Jkt 247125
PO 00000
Frm 00689
Fmt 8010
Sfmt 8010
Q:\30\30V1.TXT
PC31
| File Type | application/pdf |
| File Modified | 2019-09-23 |
| File Created | 2019-09-24 |