Sections 1910.302 through 1910.308 contain design safety standards for electric utilization systems.
(a) Scope-(1) Covered. The provisions of Secs. 1910.302 through 1910.308 cover electrical installations and utilization equipment installed or used within or on buildings, structures, and other premises, including:
(1) Covered. The provisions of Secs. 1910.302 through 1910.308 cover electrical installations and utilization equipment installed or used within or on buildings, structures, and other premises, including:
(i) Yards;
(ii) Carnivals;
(iii) Parking and other lots;
(iv) Mobile homes;
(v) Recreational vehicles;
(vi) Industrial substations;
(vii) Conductors that connect the installations to a supply of electricity; and
(viii) Other outside conductors on the premises.
(2) Not covered. The provisions of Secs. 1910.302 through 1910.308 do not cover:
(i) Installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles other than mobile homes and recreational vehicles;
(ii) Installations underground in mines;
(iii) Installations of railways for generation, transformation, transmission, or distribution of power used exclusively for operation of rolling stock or installations used exclusively for signaling and communication purposes;
(iv) Installations of communication equipment under the exclusive control of communication utilities, located outdoors or in building spaces used exclusively for such installations; or
(v) Installations under the exclusive control of electric utilities for the purpose of communication or metering; or for the generation, control, transformation, transmission, and distribution of electric energy located in buildings used exclusively by utilities for such purposes or located outdoors on property owned or leased by the utility or on public highways, streets, roads, etc., or outdoors by established rights on private property.
(b) Extent of application-(1) Requirements applicable to all installations. The following requirements apply to all electrical installations and utilization equipment, regardless of when they were designed or installed: Sec. 1910.303(b)-Examination, installation, and use of equipmentSec. 1910.303(c)(3)-Electrical connections-SplicesSec. 1910.303(d)-Arcing partsSec. 1910.303(e)-MarkingSec. 1910.303(f), except (f)(4) and (f)(5)-Disconnecting means and
circuitsSec. 1910.303(g)(2)-600 volts or less-Guarding of live partsSec. 1910.304(a)(3)-Use of grounding terminals and devicesSec. 1910.304(f)(1)(i), (f)(1)(iv), and (f)(1)(v)-Overcurrent
protection-600 volts, nominal, or lessSec. 1910.304(g)(1)(ii), (g)(1)(iii), (g)(1)(iv), and (g)(1)(v)-
Grounding-Systems to be groundedSec. 1910.304(g)(4)-Grounding-Grounding connectionsSec. 1910.304(g)(5)-Grounding-Grounding pathSec. 1910.304(g)(6)(iv)(A) through (g)(6)(iv)(D), and (g)(6)(vi)-
Grounding-Supports, enclosures, and equipment to be groundedSec. 1910.304(g)(7)-Grounding-Nonelectrical equipmentSec. 1910.304(g)(8)(i)-Grounding-Methods of grounding fixed equipmentSec. 1910.305(g)(1)-Flexible cords and cables-Use of flexible cords and
cablesSec. 1910.305(g)(2)(ii) and (g)(2)(iii)-Flexible cords and cables-
Identification, splices, and terminationsSec. 1910.307, except as specified in Sec. 1910.307(b)-Hazardous
(classified) locations
(2) Requirements applicable to installations made after March 15, 1972. Every electrical installation and all utilization equipment installed or overhauled after March 15, 1972, shall comply with the provisions of Secs. 1910.302 through 1910.308, except as noted in paragraphs (b)(3) and (b)(4) of this section.
(3) Requirements applicable only to installations made after April 16, 1981. The following requirements apply only to electrical installations and utilization equipment installed after April 16, 1981: Sec. 1910.303(h)(4)-Over 600 volts, nominal-Entrance and access to work
spaceSec. 1910.304(f)(1)(vii) and (f)(1)(viii)-Overcurrent protection-600
volts, nominal, or lessSec. 1910.304(g)(9)(i)-Grounding-Grounding of systems and circuits of
1000 volts and over (high voltage)Sec. 1910.305(j)(6)(ii)(D)-Equipment for general use-CapacitorsSec. 1910.306(c)(9)-Elevators, dumbwaiters, escalators, moving walks,
wheelchair lifts, and stairway chair lifts-Interconnection between
multicar controllersSec. 1910.306(i)-Electrically driven or controlled irrigation machinesSec. 1910.306(j)(5)-Swimming pools, fountains, and similar
installations-FountainsSec. 1910.308(a)(1)(ii)-Systems over 600 volts, nominal-Aboveground
wiring methodsSec. 1910.308(c)(2)-Class 1, Class 2, and Class 3 remote control,
signaling, and power-limited circuits-MarkingSec. 1910.308(d)-Fire alarm systems
(4) Requirements applicable only to installations made after August 13, 2007. The following requirements apply only to electrical installations and utilization equipment installed after August 13, 2007: Sec. 1910.303(f)(4)-Disconnecting means and circuits-Capable of
accepting a lockSec. 1910.303(f)(5)-Disconnecting means and circuits-Marking for series
combination ratingsSec. 1910.303(g)(1)(iv) and (g)(1)(vii)-600 Volts, nominal, or less-
Space about electric equipmentSec. 1910.303(h)(5)(vi)-Over 600 volts, nominal-Working space and
guardingSec. 1910.304(b)(1)-Branch circuits-Identification of multiwire branch
circuitsSec. 1910.304(b)(3)(i)-Branch circuits-Ground-fault circuit interrupter
protection for personnelSec. 1910.304(f)(2)(i)(A), (f)(2)(i)(B) (but not the introductory text
to
Sec. 1910.304(f)(2)(i)), and (f)(2)(iv)(A)-Overcurrent protection-
Feeders and branch circuits over 600 volts, nominalSec. 1910.305(c)(3)(ii)-Switches-Connection of switchesSec. 1910.305(c)(5)-Switches-GroundingSec. 1910.306(a)(1)(ii)-Electric signs and outline lighting-
Disconnecting meansSec. 1910.306(c)(4)-Elevators, dumbwaiters, escalators, moving walks,
wheelchair lifts, and stairway chair lifts-OperationSec. 1910.306(c)(5)-Elevators, dumbwaiters, escalators, moving walks,
wheelchair lifts, and stairway chair lifts-LocationSec. 1910.306(c)(6)-Elevators, dumbwaiters, escalators, moving walks,
wheelchair lifts, and stairway chair lifts-Identification and signsSec. 1910.306(c)(7)-Elevators, dumbwaiters, escalators, moving walks,
wheelchair lifts, and stairway chair lifts-Single-car and multicar
installationsSec. 1910.306(j)(1)(iii)-Swimming pools, fountains, and similar
installations-ReceptaclesSec. 1910.306(k)-Carnivals, circuses, fairs, and similar eventsSec. 1910.308(a)(5)(v) and (a)(5)(vi)(B)-Systems over 600 volts,
nominal-Interrupting and isolating devicesSec. 1910.308(a)(7)(vi)-Systems over 600 volts, nominal-Tunnel
installationsSec. 1910.308(b)(3)-Emergency power systems-SignsSec. 1910.308(c)(3)-Class 1, Class 2, and Class 3 remote control,
signaling, and power-limited circuits-Separation from conductors of
other circuitsSec. 1910.308(f)-Solar photovoltaic systems
(c) Applicability of requirements for disconnecting means. The requirement in Sec. 1910.147(c)(2)(iii) that energy isolating devices be capable of accepting a lockout device whenever replacement or major repair, renovation or modification of a machine or equipment is performed, and whenever new machines or equipment are installed after January 2, 1990, applies in addition to any requirements in Sec. 1910.303 through Sec. 1910.308 that disconnecting means be capable of being locked in the open position under certain conditions.