Question 5038 of 844 · Washington 01 Journey Level Electrician Exam
A 20 A branch circuit is upsized from 12 AWG to 10 AWG copper to limit voltage drop. What is the minimum copper EGC?
Exactly one answer is correct.
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Correct answer to question 5038
- B: 10 AWG
Explanation
When ungrounded conductors are increased in size, the EGC must be increased proportionally by circular mil area. 10,380 / 6,530 = 1.59, and 6,530 x 1.59 = 10,380 cmil, which is 10 AWG. See 250.122(B).
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