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

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A Class I main copper conductor must have at least 57,400 circular mils. What is the smallest standard AWG size that meets that NFPA 780 (2020) area?

4 AWG (41,740 CM) 3 AWG (52,620 CM) 2 AWG (66,360 CM) 1 AWG (83,690 CM)

Correct Answer:

2 AWG (66,360 CM)

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