An electrical one-line diagram shows power distribution originating from a 100-ampere main lug only high-voltage panel at 277/480 volts, 3-phase, 4-wire with 42 circuits and 42kAIC. A 50-ampere 3-pole breaker feeds a 30kVA transformer stepping down voltage from 480 to 120/208 volts. The transformer secondary connects to a 100-ampere main circuit breaker low-voltage panel with 42 circuits and 10kAIC. Grounding is provided per National Electrical Code Article 250.
PANEL 'HP' 100A MLO 277/480V 3PH, 4W 42CKT 42KAIC PANEL 'LP' 100A MCB 120/208V 3PH, 4W 42CKT 10KAIC 30KVA XFMR 480-120/208V 36 50A 3P 41 6G GROUND PER NEC ART. 250 C H
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