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

Which of the following is a grounding electrode permitted by NEC 2020 250.52(A)?

The metal underground gas piping system Aluminum plate electrodes buried in earth A concrete-encased electrode of at least 20 ft of 1/2 in rebar or 4 AWG copper The interior water piping on the house side of a nonmetallic water service

Correct Answer:

A concrete-encased electrode of at least 20 ft of 1/2 in rebar or 4 AWG copper

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