Originally Posted by
Gunnar Alquist
If I remember correctly, there is a line in the NEC that states that #14 cannot exceed 15 amps and #12 cannot exceed 20 amps. Even though the tables indicate otherwise. I never understood what that was all about.
Gunnar,
Wendell asked, and Bob correctly gave, the ampacity rating of the conductor in that condition.
You are referring to the maximum allowable overcurrent protection allowed, and the ampacity of the conductor in all derated conditions must exceed that for that overcurrent protection to be used.
Thus, for the question, Bob is correct, and, for overcurrent protection of that conductor in that condition, you are correct.
It is not separated 'residential' or 'non-residential', that applies to all installations.