A circuit breaker having an interrupting current rating of other than _____ shall have its interrupting rating marked on the circuit breaker.

• A. 5,000A
• B. 2,000A
• C. 10,000A
• D. 1,000A

Answer: (A)

The interrupting rating tells you the maximum fault current a circuit breaker can safely interrupt, and the NEC requires that this rating be visible on the breaker when it isn’t the standard baseline value. In this context, 5,000 A is treated as the baseline; if a breaker’s interrupting current rating is different from 5,000 A, its exact rating must be marked on the device. This marking helps ensure you don’t apply a breaker that cannot safely interrupt the available fault current at the location. Therefore, the sentence completes with 5,000 A.