Most terminals, bus, or breakers, I see a 75 C rating. So for an example using the wire table for 50A Thhn, I can use #8 Cu. Today I checked the sub panel bus rating, and it was 75 C, After I pulled in the wire, and opened the control box near the landing lugs, I found the sticker with the data, and it said 90 C wire required !!!
You guys check, or use the 75 C or 90 C on your pulls ?
Most terminals, bus, or breakers, I see a 75 C rating. So for an example using the wire table for 50A Thhn, I can use #8 Cu. Today I checked the sub panel bus rating, and it was 75 C, After I pulled in the wire, and opened the control box near the landing lugs, I found the sticker with the data, and it said 90 C wire required !!!
To me that seems like they wanted you to use 90c for the heat, but the 60c column for amps.
I am old school and always use the 60c column for 100 amps and under 75c for anything over. I don't think the size difference under 100 amps is going to break the bank, and I know I'll never run into a point where I'd have to change it because it's to small.
To me that seems like they wanted you to use 90c for the heat, but the 60c column for amps.
I am old school and always use the 60c column for 100 amps and under 75c for anything over. I don't think the size difference under 100 amps is going to break the bank, and I know I'll never run into a point where I'd have to change it because it's to small.
I can't remember sizing to the 60C unless I'm running Romex or SER???
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