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Metal Water Pipe / Electrode
Article 250 - Grounding / Bonding · Article / reference: 250.50; 250.52(A)(1); 250.53(D); 250.104(A)
Key Requirements
If a metal underground water pipe qualifies as a grounding electrode, it shall be included in the grounding electrode system.
A metal underground water pipe electrode shall be supplemented by an additional electrode as required by 250.53(D)(2).
Interior metal water piping shall be bonded as required by 250.104(A).
Exceptions / Watch Items
Electrode qualification depends on direct contact with earth for the required length and continuity conditions.
Common Field Gotchas
Grounding-electrode use and interior water-pipe bonding are related but separate checks.
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