2000kVA delta-wye xfmr, 25kV primary, 480/277V secondary, located outdoors. Primary protection consists of 80A fuses. Secondary conductors consist of 8 sets of 4-500kcmil, total length = 40ft. The conductors terminate on a switchboard bus (located indoors), which has two circuit breakers on its load side: one at 1600A, one at 1200A. This is not an industrial establishment.
Are the secondary conductors adequately protected against overcurrent, per NEC?
Are the secondary conductors adequately protected against overcurrent, per NEC?