A single point ground serves as the central ground point for the transformer, connecting the neutral and equipment ground conductors. A local ground electrode bonds to the nearest ground bar and cold water pipe. Primary and secondary 4-wire inputs feed the transformer, with neutral and equipment ground conductors routed to the panelboard.
SINGLE POINT GROUND CENTRAL GROUND POINT TRANSFORMER LOCAL GROUND ELECTRODE BOND TO NEAREST GROUND BAR AND COLD WATER PIPE PANELBOARD EQUIPMENT GROUND CONDUCTOR H1 H2 H3 EG N EG A BC NOTES: REFER TO SHEET E4.01 WIRING SCHEDULE FOR GROUNDING ELECTROD CONDUCTOR SIZES. LEGEND N - NEUTRAL IG - ISOLATED GROUND EG - EQUIPMENT GROUND N N N PRIMARY SECONDARY 4-WIRE INPUT N EG
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