I note that with 8 AWG wire... in NM-B (Romex) cable I can only get 40A: I am required to pull from the 60 degree C column of Table 310.15(B)(16). However, in conduit, with 75C wire (THHN) and terminations, I am allowed to use the 75C column, giving 50A on a #8 wire.
Can I do the same thing with #14 wire, using the 75C column to put 20A on the #14 wire?
If not, why not -- i.e. why #8 and not #14?
If so, am I then allowed to use 15A receptacles (with the backstabs and everything), and pass through the 20A?