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

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A 120/208 V service has 3/0 AWG copper ungrounded conductors. Using NEC 2020 Table 250.66, what is the minimum copper grounding electrode conductor size?

8 AWG copper 6 AWG copper 4 AWG copper 2 AWG copper

Correct Answer:

4 AWG copper

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