An electrical grounding riser diagram showing connections from the main ground bus to building steel, room piping, and distribution panels using G4/0 conductors. The grounding busbar 1-EGB-4 in the electrical room connects to room piping via a numbered detail callout and links directly to building structural steel. Additional connections tie into panel 1RDPA1 fed from MSB-RA1 with G4/0 conductors, alongside future or alternate connections for 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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