Which of the following statements about grounding electrodes is true?
A. An underground metal water pipe electrode is required to be supplemented by another
grounding electrode.
B. A concrete-encased electrode is required to be supplemented by another grounding
electrode.
C. An 8 ft (2.5 m) ground rod with a resistance of 24 ohms is required to be supplemented
by another grounding electrode.
D. Two ground plate grounding electrodes that are installed 6 ft (1.8 m) apart are
required to be supplemented by another grounding electrode.
A. An underground metal water pipe electrode is required to be supplemented by another
grounding electrode.
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