Hypothetical. I am hooking up a range/oven that requires 50A. Its terminations are rated 60C, and there's no way around it.
The 100' wiring run is all in EMT conduit and I am running THHN wires, so I am entitled to use the 75C column. #8 copper wire is allowed 50A@75C.
My circuit breaker has 75C terminations.
I have these lovely MAC Block splice connectors, rated to 90C. They take #8 and #6 wire just fine.
So I get the idea to take the #8 wire to the Mac Block splices (90C), splice to a short #6 copper pigtail, and take the #6 to the range terminations.
Have I successfully dodged the 60C rule, or is my plan thwarted for some reason?
Best Answer
If you use a j box with terminals rated at 75 you can use the higher 75deg table or even 90 for the main run then the last few feet with the larger wire at the 60 deg table we do this using the 90 deg table running large +500mcm for hundreds of feet then the 75 degree temp for the last 10 feet or so at both ends same thing works for 60 degree table.