Is there anything in the NEC that prohibits multiple parallel OCPDs on the secondary of a delta-wye, non-service transformer?
In other words, let's say I have a 45kVA, 480V delta-208/120V wye transformer in a building, with a 70A primary OCPD, and want to feed four 42-pole 150A MCB panels, with each parallel, daisy-chained 150A MCB acting as the secondary transformer OCPD. Is this allowed?
Or would I have to install a dedicated secondary 150A enclosed circuit breaker OCPD and then fan off from there to each 150A OCPD?
In other words, let's say I have a 45kVA, 480V delta-208/120V wye transformer in a building, with a 70A primary OCPD, and want to feed four 42-pole 150A MCB panels, with each parallel, daisy-chained 150A MCB acting as the secondary transformer OCPD. Is this allowed?
Or would I have to install a dedicated secondary 150A enclosed circuit breaker OCPD and then fan off from there to each 150A OCPD?