A full-size grounding electrode conductor runs from the transformer secondary grounding lug through a galvanized rigid conduit to structural building steel. The conductor connects to the building steel where it is effectively grounded to embedded foundation steel. Connections are made using exothermic welds typically.
TO XFMR SECONDARY GROUNDING LUG FULL SIZE GROUNDING ELECTRODE CONODUCTOR IN GALVANIZED RIGID CONDUIT EXOTHERMICALLY WELDED (TYPICAL) BUILDING STEEL WHERE EFFECTIVELY GROUNDED TO EMBEDDED FOUNDATION STEEL
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