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Grounding and Bonding

A service with 350 kcmil copper conductors has a GEC that runs only to two driven ground rods. Table 250.66 would give 2 AWG copper for these service conductors. What is the largest GEC the rods require?

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Every question is original and written to Each state's electrical licensing board; exams delivered by PSI, Prov and other vendors's published content outline, and every explanation cites the code section or source it relies on.