An electrical grounding system connects a main busbar to multiple grounding electrodes including two ground rods driven external to the building, building structural steel, a cold water pipe, and a concrete-encased electrode. Conductors run through conduits sized at three-quarters of an inch containing a single number six copper wire and one and one-quarter inches containing number three-zero copper wire. Connections extend to generators, the telecommunications main grounding busbar, and the main switchboard.
3/4" CONDUIT WITH 1#6 CU. 1-1/4" CONDUIT WITH #3/0 CU. EACH GROUNDING ELECTRODE CONDCUTOR 2 GROUND RODS DRIVEN EXTRENAL TO BUILDING BUILDING STEEL COLD WATER PIPE CONCRETE ENCASED ELECTRODE 'IBT' TO GENERATOR #1 TO GENERATOR #2 TO 'MSD' 1-1/4" C W/ 3/0 AWG CU TO TMGB
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