Question 13110 of 749 · Maryland Journeyperson Electrician Exam
A 40 A continuous load is supplied with THWN copper conductors terminating on 75 °C rated equipment. What is the minimum conductor size?
Exactly one answer is correct.
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Correct answer to question 13110
- B: 8 AWG
Explanation
The conductor must be rated for 40 x 1.25 = 50 A, and 8 AWG copper is rated 50 A in the 75 °C column. 10 AWG at 35 A fails, and sizing for 40 A without the 125 % factor might tempt someone to use the 90 °C rating of 10 AWG.
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