Branch Circuits & WiringQuestion 213 of 521
Per Table 310.16, what is the ampacity of a 12 AWG copper conductor in the 75°C column (before any small-conductor overcurrent limit)?
a.25 A
b.20 A
c.30 A
d.35 A
Explanation
Table 310.16 lists 25 A for 12 AWG copper at 75°C. 20 A is the 60°C value (and also the 240.4(D) OCPD limit), while 30 A is the 90°C value; 35 A is for 10 AWG.
Law Reference: 2023 NEC §310.16Practice all 521 questions free — no signup required.
Related questions on this topic
- A 90°C-rated conductor is terminated on equipment whose lugs are listed for 75°C. Which temperature column limits the conductor's final ampacity at that termination?
- Under what circumstance may the 90°C ampacity column of Table 310.16 be used?
- Per Table 310.16, what is the ampacity of an 8 AWG copper THHN conductor in the 90°C column?
- Per Table 310.16, what is the ampacity of a 10 AWG copper conductor in the 60°C column?
- Per Table 310.16, what is the ampacity of a 6 AWG copper conductor in the 75°C column?
- Per 334.80, the ampacity of Type NM (nonmetallic-sheathed) cable is based on which temperature column of Table 310.16?
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