What is this 1/0 minumum wire size for parallel conductors based on? (NEC 310.4) Why can't I go smaller, as long as the conductors are identical?
Case in point is a 460V 125HP Variable Frequency Drive (VFD) rated for 164 Amps. I am using a 225A circuit breaker that also feeds other panels. The lugs on the drive don't allow a 3/0 wire, but it must be at least 3/0 for the 225A breaker.