SC Electrician Practice Questions - South Carolina Electrician Contractor Examination Exam

Which installation qualifies as a concrete-encased electrode under 250.52(A)(3)?

20 feet or more of 1/2-inch electrically conductive reinforcing bar, or 20 feet of 4 AWG bare copper, encased in at least 2 inches of concrete near the bottom of a foundation Any rebar that happens to be in a slab, regardless of length A single 8-foot ground rod set in the footing 10 feet of 6 AWG copper laid on the vapor barrier

Correct Answer:

20 feet or more of 1/2-inch electrically conductive reinforcing bar, or 20 feet of 4 AWG bare copper, encased in at least 2 inches of concrete near the bottom of a foundation

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