An electrical ground bus, designated 1-EGB-3 in the electrical room, connects to building steel, room piping, and multiple distribution panels including 1PDPA3 and STSDP-PA3. Connections originate from main switchboard MSB-PA3 and emergency ground bus 1-EMGB-1 using G4/0 grounding conductors. Tagged notes and riser lines coordinate the grounding infrastructure across the electrical system.
G4/0 G4/0 G4/0 G4/0 G4/0 G4/0 G4/0 1-EGB-3 ELEC. RM. FROM 1-EMGB-1 ROOM PIPING BUILDING STEEL 1 2 G 1PDPA3 FROM MSB-PA3 G FROM MSB-PA3 STSDP-PA3
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