A commercial feeder supplies lighting loads. What should guide selection of its overcurrent protection?
- AUse any fused disconnect regardless of its ratings
- Select approved protection coordinated with the conductors, equipment and available fault current
- CUse a GFCI instead of checking overcurrent ratings
- DRequire a circuit breaker solely because the building is commercial
Where to look it up
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.304
Why B is correct
Fuses and circuit breakers are both used for overcurrent protection; the commercial-building label alone does not select one. Check the device ratings and coordination with conductor capacity, connected equipment and available fault current. Other protection requirements must be evaluated separately.