Based on the 2017 edition of the NEC:
A 250kVA, 480-volt, 3-phase, outdoor generator set is equipped with a 300A inverse-time circuit breaker that feeds a 200A, MCB, branch-circuit panelboard on the outside of a building. What is the minimum sized XHHW type copper conductors that are permitted to be installed in schedule 80, PVC underground between the generator and the panelboard?
Vote below! Answer will be posted on Tuesday, November 7th.