Employers must provide either ground-fault circuit interrupters (GFCIs) or an assured equipment grounding conductor program to protect employees from ground-fault hazards at construction sites. The two options are detailed below.

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All 120-volt, single-phase, 15- and 20-ampere receptacles that are not part of the permanent wiring must be protected by GFCIs. Receptacles on smaller generators are exempt under certain conditions.

An assured equipment grounding conductor program covering extension cords, receptacles, and cord- and plug-connected equipment must be implemented. The program must include the following, a written description of the program. At least one competent person to implement the program.

Daily visual inspections of extension cords and cord and plug-connected equipment for defects. Equipment found damaged or defective shall not be used until repaired.

Continuity tests of the equipment grounding conductors or receptacles, extension cords, and cord- and plug-connected equipment. These tests must generally be made every 3 months.

Required tests shall be recorded. 1926.404(b)(1)(i) through (iii)(e)

Light bulbs for general illumination must be protected from breakage, and metal shell sockets must be grounded. 1926.405(a)(2)(ii)(E)

Temporary lights must not be suspended by their cords, unless they are so designed. 1926.405(a)(2)(ii)(F)

Portable lighting used in wet or conductive locations, such as drums, tanks, and vessels, must be operated at no more than 12 volts or must be protected by a ground-fault circuit interrupter (GFCI). 1926.405(a)(2)(ii)(G)

Extension cords must be of the three-wire type. Extension cords and flexible cords used with temporary and portable lights must be designed for hard or extra hard usage (for example, types S, ST, and SO). 1926.405(a)(2)(ii)(J)

Flexible cords must be connected to devices and fittings so that strain relief is provided which will prevent pull from being directly transmitted to joints or terminal screws. 1926.405(g)(2)(iv)

Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. 1926.403(b)(2)