R 408.41721 Ground fault circuit interrupters.

Rule 1721. All 120-volt, single-phase 15 and 20 ampere receptacle outlets used for construction operations, which are not a part of the permanent wiring of the building or structure and which are in use by an employee, shall have approved ground fault circuit interrupters for personnel protection. A receptacle on a 2-wire, single-phase portable or vehicle mounted generator rated at not more than 5 kilowatt, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces, need not be protected with ground fault interrupters.