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Verify GEC sizing per NEC 250.66

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Grounding electrode conductor undersized for service rating

GEC specified on does not meet minimum per for 200A service.

Code requirement

NEC 250.66 requires minimum #2 AWG copper GEC for 200A service with 3/0 ungrounded conductors. Drawing specifies #6 AWG—insufficient cross-sectional area per .

Recommendation

Revise grounding design per 250.66: specify #2 AWG copper GEC; update one-line and grounding details on .

Formal response

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