A continuous number three-zero gauge bare copper conductor runs through a rigid non-metallic conduit into a concrete foundation in direct contact with earth, maintaining a minimum twenty-foot length. The conductor is positioned between one inch minimum and two inches maximum from the soil interface. A main building reference ground bus connects to the upper terminus. A dry gravel bed or vapor barrier is explicitly prohibited in the contact zone.
MAIN BUILDING REFERENCE GROUND BUS RIGID NON-METALLIC CONDUIT CONCRETE FOUNDATION IN DIRECT CONTACT IN EARTH. DRY GRAVEL BED OR VAPOR BARRIER PROHIBITED 20 FEET MIN. #3/0 AWG BARE COPPER CONDUCTOR 2"MAX.1"MIN. SLAB CONSTRUCTION (SEE STRUCTURAL DETAIL) #3/0 AWG BARE COPPER, 1" MIN. 2"MAX FROM SOIL. CONDUCTOR SHALL BE CONTINUOUS; COORDINATE WITH STRUCTURAL. UFER GROUNDING ELECTRODE DETAIL
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