Electrical Power & Lighting Circuits

Load-rated switches, circuit breakers, or other devices specifically designed as disconnecting means must be used for the opening, reversing, or closing of circuits under load conditions. Cable connectors not of the load break type, fuses, terminal lugs, and cable splice connections cannot be used for such purposes, except in an emergency.

After a circuit is de-energized by a circuit protective device, the circuit cannot be manually reenergized until it has been determined that the equipment and circuit can be safely energized. The repetitive manual reclosing of circuit breakers or reenergizing circuits through replaced fuses is prohibited.

Overcurrent protection of circuits and conductors cannot be modified, even on a temporary basis, beyond that allowed by the installation safety requirements for overcurrent protection.

In addition to the subjects just reviewed, the regulations in 29 CFR 1910.304 set out required work practices for testing instruments and equipment and for the occasional use of flammable or ignitable materials.

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