SC Lightning Protection Practice Questions - South Carolina Lightning Protection Systems Contractor Examination Exam

Which underground metal system shall not be used as a grounding electrode under NEC 2020 250.52(B)?

A metal underground water pipe in direct contact with the earth for 10 ft or more A metal in-ground support structure in contact with the earth for 10 ft or more A metal underground gas piping system A concrete-encased electrode in a footing

Correct Answer:

A metal underground gas piping system

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