Code Q&A: Grounding Electrode Guidelines

Grounding electrode conductor rules

Q. When does the Code allow the building metal structure to serve as a grounding electrode?

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A. Only metal in-ground support structure(s) in direct contact with the earth vertically for 10 ft or more can serve as a grounding electrode [250.52(A)(2)]. Note: Metal in‑ground support structures include, but aren’t limited to, pilings, casings, and other structural metal.

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