Originally posted by johndeereman:
As long as the equipment is marked 75 C you can use the 75 C column with THHN or THWN. If not marked you are stuck with 60 C under 100 amps.
Help me out here, I need a little education.
Unmarked - used 60 deg C column
Marked 75C - use 75C column with 75/90C wire
I understand that.
The question: What conductor temp rating do you use if the device is marked 60/75C?
My buddy, the second best EE in Alaska, says it means to use 60C column with 60C wire and 75C column with 75C wire. I say that is the same thing that being marked 75C means. The best EE in the state agrees with me - He doesn't know what or if there is a difference between the two markings.
Anybody got any clues?
carl