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

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A 480 Y/277 V service is supplied by 500 kcmil copper ungrounded conductors. What copper GEC size does NEC 2020 Table 250.66 require (before any electrode-specific cap)?

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

Correct Answer:

1/0 AWG copper

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