A 75kVA three-phase, four-wire transformer steps down 480V to 208Y/120V and connects to a designated section designated as 1LA1D. A number four-slash-zero copper grounding conductor runs to the transformer ground per the National Electrical Code. A thirty-ampere switch or protective device feeds downstream sections designated as section two and section three.
30 SE, A 225/3 "1LA1D" GROUND PER NEC #4/0 CU T1D-LA 75kVA 480-208Y/120V 3Ø, 4W XFMR SECT 2 SECT 3 "1LA1D" "1LA1D"
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