SC Burglar Alarm Practice Questions - South Carolina Burglar Alarm Contractor Examination Exam

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A single rod, pipe, or plate grounding electrode is installed. Under NEC 250.53(A)(2), a supplemental electrode is not required if that single electrode has a resistance to earth of not more than which value?

5 ohms 10 ohms 25 ohms 50 ohms

Correct Answer:

25 ohms

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