The ground wire should not be smaller than No _________ copper
Correct answer: D. 10
- A. 2
- B. 4
- C. 6
- D. 10
Explanation
A grounding conductor must have sufficient cross-sectional area to carry fault current safely without overheating; the stated minimum in this wiring convention is No. 10 copper. Smaller numbers such as No. 6, 4, or 2 represent thicker conductors, but they are not the specified minimum.
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