The transformer housing connects to the nearest ground bus or nearest ground electrode per NEC 250-94 via ground lugs. The equipment ground and system grounding electrode conductor provide bonding from the 480V 3-phase primary and 120/208V 3-phase secondary windings. A bonding jumper and system grounding electrode conductor tie the neutral to ground according to NEC requirements.
TO NEAREST GROUND BUS OR NEAREST GROUND ELECTRODE PER NEC 250-94. TRANSFORMER HOUSING GROUND LUGS EQUIPMENT GROUND GROUND NEUTRAL GROUND 480V-3PH 120/208V-3PH SECONDARY PRIMARY BONDING JUMPER AND SYSTEM GROUNDING ELECTRODE CONDUCTOR PER NEC 250-94.
Members view this detail in full resolution, download the CAD files (SVG, PDF), and can adapt it in the built-in CAD editor — export DXF, DWG, or PDF.
Start membership