Question 3009 of 844 · Washington 01 Journey Level Electrician Exam
A feeder is protected at 400 A. What is the minimum copper THWN tap conductor at 75 degrees C for a 25 ft tap?
Exactly one answer is correct.
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Correct answer to question 3009
- D: 1/0 AWG
Explanation
One-third of 400 A is about 133 A. From Table 310.16, 75 degree C column, 1 AWG copper is 130 A, too small, and 1/0 copper is 150 A. See 240.21(B)(2).
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