When a metal underground water pipe is used as a grounding electrode, it must be in contact with the earth for at least __________ feet.

Name: When a metal underground water pipe is used as a grounding electrode, it must be in contact with the earth for at least __________ feet.
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Question

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According to the National Electrical Code (NEC), a metal underground water pipe used as a grounding electrode must be in contact with the earth for at least 10 feet in order to provide an adequate grounding path.

When a Metal Underground Water Pipe Is Used as a Grounding