Which of the following is a recognized grounding electrode under the NEC?

Which of the following is a recognized

Multiple choice — select the best answer

AThe neutral conductor of the service
BA plastic water pipe buried in the ground
CA concrete-encased electrode (Ufer ground)
DAn aluminum rod driven 8 feet into the earth

✓ Correct answer: C. A concrete-encased electrode (Ufer ground) A concrete-encased electrode (Ufer ground) — 20 feet or more of rebar in a concrete foundation — is a recognized NEC grounding electrode. Aluminum rods are not permitted, and plastic pipe is not conductive.

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Which of the following is a recognized grounding electrode under the NEC?

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