I am working on a customer designed installation. The proposed installation is as follows: A 700A breaker is feeding a 500 kVA transformer - 480 primary - 208/120 secondary. The secondary will feed (2) 1200A main lug only panels which are installed right beside the transformer (less than 10' conductor length) Are the secondary conductors required to terminate in an OCPD and what code section(s) apply?
Is the primary/secondary ratio the proper way to size the secondary feeders? (480/208=2.31) (700A primary X 2.31 = 1617A secondary feeder)
Is the primary/secondary ratio the proper way to size the secondary feeders? (480/208=2.31) (700A primary X 2.31 = 1617A secondary feeder)