Question 5003 of 790 · California General Electrician Exam
When a metal underground water pipe is used as a grounding electrode, what else does the Code require?
Exactly one answer is correct.
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Correct answer to question 5003
- C: It must be supplemented by an additional electrode
Explanation
A water pipe electrode can lose its earth contact when a plastic section is installed later, so it must always be supplemented by an additional electrode of a recognized type. See 250.53(D)(2).
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