Bob- You raise a very interesting point that I have never been able to get an answer to.
George I believe you but I do not understand
the reason. Under the 60C and 75C col, #12 conductor is rated for 20 amps. If you use
the 60C conductor at 20 amps continuous load the temp will rise to 60C. Should be no problem for the breaker.
How warm does a #12 AWG wire get when it conducts 20a and how warm do terminals get that are rated 60/75 degrees? I know the wire won't be damaged and that wire is rated for continous load and I know that terminals <600v typically are not rated for 90 degree use? What with that? I Think fretwell should be complemented for bring up this sorry subject
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