the NEC aticle 430.52 states that the over current protection for a instantaneous trip type breaker ueased with three phase type B motor FLA shall be increased by a factor of 1000% this i know but that seams drastic for the size of the breaker to be sized that high.this would make it a 1000a...
I HAVE A WESTING HOUSE CONTROL CENETR WITH 100A ADUSTABLE INSANTANEOUS TRIP BREAKER INSTALLED FEEDING A THIRTY H.P. THREE PHASE 480V INDUCTION TYPE B ENERGY EFFIENT MOTOR NEED TO CHANGE TO A FIFTY H.P. OF THE SAME TYPE WHAT SIZE BREAKER DO I NEED ?
