A 400-ampere, 480-volt branch circuit is supplying a motor. What is the minimum size of the overcurrent protection required for this circuit?
- A300-ampere
- B400-ampere
- 500-ampere
- D600-ampere
Exam tip
Be familiar with the requirements for overcurrent protection for motors.
Why C is correct
According to 430.22(C), the overcurrent protection for a motor must be not less than the motor's full-load current rating. The 300-ampere and 400-ampere options are insufficient, and the 600-ampere option is not required.