Question 13034 of 844 · Washington 01 Journey Level Electrician Exam
A 240 volt single-phase feeder uses 4 AWG aluminum conductors (41,740 circular mils), 175 feet one way, carrying 60 A. Using K = 21.2 for aluminum, what is the voltage drop?
Exactly one answer is correct.
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Correct answer to question 13034
- B: 10.67 V
Explanation
VD = 2 x 21.2 x 60 x 175 / 41,740 = 10.67 V. Using the copper K of 12.9 gives 6.49 V, which understates the drop on aluminum.
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