Primary and secondary grounding connections for a 480V to 208/120V three-phase transformer housed within a single enclosure. The primary side features a delta-connected 480-volt winding, while the secondary side utilizes a wye-connected 208/120-volt winding with a grounded neutral. A wire schedule table correlates transformer kilovolt-ampere ratings from 15 kVA up to 500 kVA with corresponding primary and secondary ground conductor sizes. All grounding installations comply with the National Electrical Code requirements, utilizing designated ground lugs inside the transformer housing.
480V, 3PH TRANSFORMER HOUSING TRANSFORMER KVA 15 #8 WIRE SCHEDULE 1 #8 2 30 #8 #8 45 #6 #6 75 #2 #2 112.5 #1/0 #1/0 150 #1/0 #1/0 225 #2/0 #2/0 300 #3/0 #3/0 500 #4/0 #4/0 208/120V, 3PH SECONDARY GROUND CONDUCTOR PRIMARY GROUND CONDUCTOR GROUND LUGS INSIDE TRANSFORMER GROUNDING PER NEC CODE PRIMARY SECONDARY 1 2
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