An electrical ground bus in the electrical room connects to building steel, room piping, and various subpanels using G4/0 grounding conductors. Feeders originate from emergency motor control bus 1-EMGB-1, main switchboard sections MSB-RA1, and MSB-PA2. Grounding connections tie into panels 1RDPA1 and STSDP-PA2.
G4/0 G4/0 G4/0 G4/0 G4/0 G4/0 G4/0 1-EGB-4 ELEC. RM. FROM 1-EMGB-1 ROOM PIPING BUILDING STEEL 1 2 G 1RDPA1 FROM MSB-RA1 G FROM MSB-PA2 STSDP-PA2
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