Question 5055 of 844 · Washington 01 Journey Level Electrician Exam
A transformer supplies 250 kcmil copper secondary conductors. What is the minimum copper GEC for this separately derived system?
Exactly one answer is correct.
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Correct answer to question 5055
- C: 2 AWG
Explanation
The GEC for a separately derived system is sized from Table 250.66 based on the derived ungrounded conductors. 250 kcmil copper is over 3/0 through 350 kcmil, so 2 AWG copper is required. See 250.30(A)(5).
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