When a metal water pipe will be used as a grounding electrode, the length of contact with soil must be A. at least 2 feet. B. 8 feet or more. C. 10 feet or more. D. at least 5 feet
b.1. When a metal water pipe will be used as a grounding electrode, the length of contact with soil must be
A. at least 2 feet.
B. 8 feet or more.
C. 10 feet or more.
D. at least 5 feet
b.2. Which of the following statements about auxiliary grounding electrodes is true?
A. Their connection to the Earth is in distant proximity to the equipment they supplement.
B. They're installed to meet a requirement in the National Electrical Code.
C. The National Electrical Code specifies the distance from the equipment they supplement.
D. They're sometimes specified by electrical equipment manufacturers and facility owners.
b.c. Which of the following formulas would you use to find current?
A. R = E ÷ I
B. I = R × E
C. I = E ÷ R
D. E = I × R
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