If you're only trying to provide power to a 60A panel on secondary sideApprox what size xfrmr for 125a 480v panel on primary side and 120/208 60A panel on secondary side? Thanks.
Sorry 50A 3P breaker feeding the transformer. I get 45kva.
I misunderstood that you were trying to figure out the size of an existing x former by looking at the 50a breaker feeding it.If you need 60 amps at 208 3phase to feed your load. 208 x 1.733 x 60= about 22kva or more,Using panel size or breaker sizes is not the best way to size it.