How should I size my feeder breaker? I have a 50hp motor. Using table 430-150 the amps are 65A. The wire size is #3AWG. Using NEC 430-52 the MCP should be sized no greater than the value calculated using table 430-152. This value is 65A X 2.5 = 162.5. Likewise, the using 430-62 the same applies. This rating can not exceed the settings for the branch circuit, short circuit and ground fault protection device which was calculated using table 430-152. If this is correct, can my MCP and Feeber Breaker sized the same, 150AMPS? What is industry standards? Am I on the right track?
