An electrical grounding busbar (1-EGB-3) located in the electrical room connects to building steel, room piping, and multiple distribution panels including 1PDPA3 and STSDP-PA3. Conductors sized at G4/0 tie the equipment and structural elements to the main grounding busbar. Feeders from MSB-PA3 and 1-EMGB-1 provide upstream grounding connections.
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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