Power transforms and distributes from a 277/480V 3-phase 4-wire high-voltage panel HP1 protected by a 125A 3-pole breaker through a 75 kVA transformer. The transformer TX1 features a 480V delta primary and a 120/208V wye secondary, grounded in accordance with NEC 250. Power continues downstream to a 120/208V 3-phase 4-wire low-voltage panel LP1 protected by a 225A 3-pole breaker.
PANEL "LP1" 120/208V 3ɸ,4W 225A/3P PANEL "HP1" 277/480V 3ɸ,4W 125A/3P TX1 75kVA 480V DELTA PRIMARY 120/208V WYE SECONDARY GROUND AS PER NEC 250 32X 430
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