Question 13058 of 749 · Maryland Journeyperson Electrician Exam
12 AWG copper UF cable (60 °C rated) is installed where the ambient temperature is 40 °C. What is its corrected ampacity?
Exactly one answer is correct.
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Correct answer to question 13058
- B: 16.4 A
Explanation
UF cable uses the 60 °C column, where 12 AWG copper is 20 A, and the 60 °C correction for 36 to 40 °C is 0.82: 20 x 0.82 = 16.4 A. Using the 90 °C factor 0.91 gives 18.2 A.
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