Yeah, gfretwell and cpal, I get the point that its ok to use the higher rated wire at the motor connections. Its just a bit confusing when they talk about both source and load end connections in the same section. The wording of 110.14(C)(1):
"(a) Termination provisions of equipment for circuits rated 100 amperes or less, or marked for 14 AWG through 1AWG, shall be used only for one of the following:
(1) Conductors rated 60*C (140*F).
(4) For motors marked..conductors having an insulation rating of 75*C (167*F)or higher shall be permitted to be used, provided the ampacity of such conductors does not exceed the 75*C (167*F) ampacity."
The 4th part leaves one to conclude that 75*C wire is ok to hook up to the 60*C breaker (or whatever overcurrent device is feeding the motor circuit). What would it hurt to change that last sentence to '..does not exceed the 60*C (157*F) ampacity.'?
PS, I'll be out of town for a couple of days, so I'll be glad to talk with you all some more about this at that time.