Temporary Wiring

Temporary electrical power and lighting installations of 600 volts nominal or less may be used only during remodeling, maintenance, or repair of buildings, structures, or equipment, and similar activities; or for a limited time period for holiday, decorative, carnival, or similar lighting purposes. Temporary wiring is also acceptable for experimental or development work, and during emergencies.

Temporary electrical installations of more than 600 volts may be used only during periods of tests, experiments, emergencies, or construction-like activities. Any temporary wiring must be removed immediately upon completion of the project or purpose for which the wiring was installed.

The regulations in CFR 29 1910.305 set out specific requirements that apply to feeders and branch circuits in temporary wiring.

No bare conductors nor earth returns may be used for the wiring of any temporary circuit. Receptacles must be of the grounding type. Unless installed in a continuous grounded metallic raceway or metallic covered cable, each branch circuit must contain a separate equipment grounding conductor and all receptacles must be electrically connected to the grounding conductor.

Suitable disconnecting switches or plug connectors must be installed to permit the disconnection of all ungrounded conductors of each temporary circuit.

Several wiring methods for specific circumstances are regulated. These regulations are provided beginning at 29 CFR 1910.305.

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