If non-series-rated overcurrent devices (standard molded-case circuit breakers)are to be installed in the main switchboard, breakers with adequate ____ must be installed in the panelboards.
A)fault current
B)short-circuit ratings
C)interrupting ratings
D)fuses

Question

Quizplus · Accepted Answer

Circuit breakers must have adequate interrupting ratings to safely interrupt the highest potential fault current they might have to interrupt. This ensures the safety and reliability of the electrical system by preventing the circuit breaker from failing in the event of a high fault current.

If Non-Series-Rated Overcurrent Devices (Standard Molded-Case Circuit Breakers)are to Be