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

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A rooftop HVAC unit is 4.0 ft from a down conductor. The unit is 30 ft above the lightning-protection ground reference, two qualifying downs are in the zone (n = 1.5), and the gap is through air (Km = 1). Is a bond required?

Yes, because all rooftop HVAC must be bonded regardless of distance Yes, because 4.0 ft is less than D = 5.0 ft using n = 1 No, because D = 30 / 9 = 3.33 ft and 4.0 ft is outside that distance No, because HVAC equipment is isolated by its electrical grounding conductor

Correct Answer:

No, because D = 30 / 9 = 3.33 ft and 4.0 ft is outside that distance

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