Overcurrent Protective Device for Motor Control Circuits

Part VI of Art. 430 contains modifications of the general requirements and applies to particular conditions of motor control circuits.

June 27, 2014

Motor control circuit conductors (larger than 10 AWG) that extend beyond the motor control equipment enclosure shall have short-circuit and ground-fault protection sized not greater than _____ % of value specified in Table 310.15(B)(16) for 60°C conductors.

a) 100
b) 150
c) 300
d) 400

See answer and applicable Code reference

The correct answer is: c) 300

Part VI of Art. 430 contains modifications of the general requirements and applies to particular conditions of motor control circuits. As noted in the last sentence of 430.72(B)(2), "Where the conductors extend beyond the motor control equipment enclosure, the rating of the protective device(s) shall not exceed the value specified in Column C of Table 430.72(B)."