Which table is cited for the sizing values comparing circuit breakers to time-delay fuses in motor circuits?

Which table is cited for the sizing values comparing circuit breakers to time-delay fuses in motor circuits?

• A. 430.52 (C) (1)
• B. 430.52 (B) (2)
• C. 430.52 (A) (3)
• D. 430.52 (D) (4)

Answer: (A)

In motor circuit protection, the sizing values for choosing between a circuit breaker and a time-delay fuse are found in the table referenced by 430.52(C)(1). This table is specifically designed to provide the sizing guidance when you’re comparing or substituting circuit breakers with time-delay fuses, based on the motor’s full-load current. It accounts for the start-up inrush of motors by allowing the time-delay characteristic to prevent nuisance tripping, while still ensuring adequate protection. Other parts of 430.52 cover different protection scenarios or device types, so they don’t address this particular comparison.

In motor circuit protection, the sizing values for choosing between a circuit breaker and a time-delay fuse are found in the table referenced by 430.52(C)(1). This table is specifically designed to provide the sizing guidance when you’re comparing or substituting circuit breakers with time-delay fuses, based on the motor’s full-load current. It accounts for the start-up inrush of motors by allowing the time-delay characteristic to prevent nuisance tripping, while still ensuring adequate protection. Other parts of 430.52 cover different protection scenarios or device types, so they don’t address this particular comparison.