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

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Using the NFPA 780 (2020) 150 ft rolling-sphere model, what is the horizontal protected distance at grade from a 30 ft-high strike-termination device? Use d = √[h(2R − h)], where R = 150 ft.

60 ft 75 ft 90 ft 120 ft

Correct Answer:

90 ft

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