Electrical equipment containing main disconnects connects to multiple grounding electrodes including two ground rods driven external to the building, building steel, a cold water pipe, and a concrete-encased electrode. Conductors run through a 1/2-inch conduit with one number 6 copper conductor and a 1-1/4-inch conduit with number 3/0 copper for each grounding electrode conductor.
N GND BUILDING STEEL EXTERNAL TO BUILDING RODS DRIVEN 2 GROUND PIPE ENCASED ELECTRODE COLD WATER CONCRETE ELECTRICAL EQUIPMENT CONTAINING MAIN DISCONNECT(S) 1/2" CONDUIT WITH 1#6 CU. 1-1/4" CONDUIT WITH #3/0 CU. EACH GROUNDING ELECTRODE CONDCUTOR
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