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

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A service is supplied by 250 kcmil copper ungrounded conductors. What copper GEC size does NEC 2020 Table 250.66 require (before any 250.66(A)–(C) electrode cap)?

4 AWG copper 3 AWG copper 2 AWG copper 1/0 AWG copper

Correct Answer:

2 AWG copper

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