29 CFR part 1926, subpart K

Occupational Safety and Health Admin., Labor
not be permitted to engage in, or be exposed to the process until the following
special precautions have been taken:
(i) The use of chlorinated solvents
shall be kept at least 200 feet, unless
shielded, from the exposed arc, and surfaces prepared with chlorinated solvents shall be thoroughly dry before
welding is permitted on such surfaces.
(ii) Employees in the area not protected from the arc by screening shall
be protected by filter lenses meeting
the requirements of subpart E of this
part. When two or more welders are exposed to each other’s arc, filter lens
goggles of a suitable type, meeting the
requirements of subpart E of this part,
shall be worn under welding helmets.
Hand shields to protect the welder
against flashes and radiant energy
shall be used when either the helmet is
lifted or the shield is removed.
(iii) Welders and other employees
who are exposed to radiation shall be
suitably protected so that the skin is
covered completely to prevent burns
and other damage by ultraviolet rays.
Welding helmets and hand shields shall
be free of leaks and openings, and free
of highly reflective surfaces.
(iv) When inert-gas metal-arc welding is being performed on stainless
steel, the requirements of paragraph
(c)(2) of this section shall be met to
protect against dangerous concentrations of nitrogen dioxide.
(e) General welding, cutting, and heating. (1) Welding, cutting, and heating,
not involving conditions or materials
described in paragraph (b), (c), or (d) of
this section, may normally be done
without mechanical ventilation or respiratory protective equipment, but
where, because of unusual physical or
atmospheric conditions, an unsafe accumulation of contaminants exists,
suitable mechanical ventilation or respiratory protective equipment shall be
provided.
(2) Employees performing any type of
welding, cutting, or heating shall be
protected by suitable eye protective
equipment in accordance with the requirements of subpart E of this part.
[44 FR 8577, Feb. 9, 1979; 44 FR 20940, Apr. 6,
1979, as amended at 55 FR 42328, Oct. 18, 1990;
58 FR 35179, June 30, 1993]

§ 1926.400

§ 1926.354 Welding, cutting, and heating in way of preservative coatings.
(a) Before welding, cutting, or heating is commenced on any surface covered by a preservative coating whose
flammability is not known, a test shall
be made by a competent person to determine its flammability. Preservative
coatings shall be considered to be highly flammable when scrapings burn with
extreme rapidity.
(b) Precautions shall be taken to prevent ignition of highly flammable
hardened preservative coatings. When
coatings are determined to be highly
flammable, they shall be stripped from
the area to be heated to prevent ignition.
(c) Protection against toxic preservative coatings: (1) In enclosed spaces, all
surfaces covered with toxic preservatives shall be stripped of all toxic coatings for a distance of at least 4 inches
from the area of heat application, or
the employees shall be protected by air
line respirators, meeting the requirements of subpart E of this part.
(2) In the open air, employees shall be
protected by a respirator, in accordance with requirements of subpart E of
this part.
(d) The preservative coatings shall be
removed a sufficient distance from the
area to be heated to ensure that the
temperature of the unstripped metal
will not be appreciably raised. Artificial cooling of the metal surrounding
the heating area may be used to limit
the size of the area required to be
cleaned.

Subpart K—Electrical
AUTHORITY: Sections 6 and 8 of the Occupational Safety and Health Act of 1970 (29
U.S.C. 655 and 657); sec. 107, Contract Work
Hours and Safety Standards Act (40 U.S.C.
333); Secretary of Labor’s Order No. 9–83 (48
FR 35736) or 1–90 (55 FR 9033), as applicable;
29 CFR part 1911.
SOURCE: 51 FR 25318, July 11, 1986, unless
otherwise noted.

GENERAL
§ 1926.400

Introduction.

This subpart addresses electrical
safety requirements that are necessary

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§ 1926.401

29 CFR Ch. XVII (7–1–07 Edition)

for the practical safeguarding of employees involved in construction work
and is divided into four major divisions
and applicable definitions as follows:
(a) Installation safety requirements. Installation safety requirements are contained in §§ 1926.402 through 1926.408. Included in this category are electric
equipment and installations used to
provide electric power and light on
jobsites.
(b) Safety-related work practices. Safety-related work practices are contained
in §§ 1926.416 and 1926.417. In addition to
covering the hazards arising from the
use of electricity at jobsites, these regulations also cover the hazards arising
from the accidental contact, direct or
indirect, by employees with all energized lines, above or below ground,
passing through or near the jobsite.
(c) Safety-related maintenance and environmental considerations. Safety-related maintenance and environmental
considerations
are
contained
in
§§ 1926.431 and 1926.432.
(d) Safety requirements for special
equipment. Safety requirements for special equipment are contained in
§ 1926.441.
(e) Definitions. Definitions applicable
to this subpart are contained in
§ 1926.449.
§ 1926.401

[Reserved]

INSTALLATION SAFETY REQUIREMENTS
§ 1926.402

Applicability.

(a) Covered. Sections 1926.402 through
1926.408 contain installation safety requirements for electrical equipment
and installations used to provide electric power and light at the jobsite.
These sections apply to installations,
both temporary and permanent, used
on the jobsite; but these sections do
not apply to existing permanent installations that were in place before the
construction activity commenced.
NOTE: If the electrical installation is made
in accordance with the National Electrical
Code ANSI/NFPA 70–1984, exclusive of Formal Interpretations and Tentative Interim
Amendments, it will be deemed to be in compliance with §§ 1926.403 through 1926.408, except for §§ 1926.404(b)(1) and 1926.405(a)(2)(ii)
(E), (F), (G), and (J).

(b) Not covered. Sections 1926.402
through 1926.408 do not cover installations used for the generation, transmission, and distribution of electric
energy, including related communication, metering, control, and transformation
installations.
(However,
these regulations do cover portable and
vehicle-mounted generators used to
provide power for equipment used at
the jobsite.) See subpart V of this part
for the construction of power distribution and transmission lines.
§ 1926.403 General requirements.
(a) Approval. All electrical conductors and equipment shall be approved.
(b) Examination, installation, and use
of equipment—(1) Examination. The employer shall ensure that electrical
equipment is free from recognized hazards that are likely to cause death or
serious physical harm to employees.
Safety of equipment shall be determined on the basis of the following
considerations:
(i) Suitability for installation and
use in conformity with the provisions
of this subpart. Suitability of equipment for an identified purpose may be
evidenced by listing, labeling, or certification for that identified purpose.
(ii) Mechanical strength and durability, including, for parts designed to
enclose and protect other equipment,
the adequacy of the protection thus
provided.
(iii) Electrical insulation.
(iv) Heating effects under conditions
of use.
(v) Arcing effects.
(vi) Classification by type, size, voltage, current capacity, specific use.
(vii) Other factors which contribute
to the practical safeguarding of employees using or likely to come in contact with the equipment.
(2) Installation and use. Listed, labeled, or certified equipment shall be
installed and used in accordance with
instructions included in the listing, labeling, or certification.
(c) Interrupting rating. Equipment intended to break current shall have an
interrupting rating at system voltage
sufficient for the current that must be
interrupted.
(d) Mounting and cooling of equipment—(1) Mounting. Electric equipment

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