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

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A heavy-duty stack more than 75 ft high with a flue larger than 500 in² is protected per NFPA 780. Which air-terminal rule applies at the top of that stack?

Class I 3/8 in copper rods, 10 in tall, spaced 20 ft apart Class II rods not less than 5/8 in diameter and 18 to 30 in high, spaced not more than 8 ft apart (and within 2 ft of square-stack corners) A single 24 in Class II rod at the center of the flue No air terminals if the stack shell is 1/8 in steel

Correct Answer:

Class II rods not less than 5/8 in diameter and 18 to 30 in high, spaced not more than 8 ft apart (and within 2 ft of square-stack corners)

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