This electrical riser diagram details the main service grounding connections including two three-quarter-inch by ten-foot ground rods, building steel, cold water pipe, and Ufer ground tied to the main ground bus. The system includes a 4000-ampere three-phase main with ground fault protection and surge protective device, referencing detail six on sheet E5.13.
G COLD WATER UFFER BLDG STEEL (2) 3/4"x10' GRD. ROD. 4000A 3P MAIN GFP SPD REFER TO SERVICE GROUND DETAIL 6/E5.13
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