What column to use 75 degree or 60 degree? I know the weekest link is the determining factor of what column to use. My question is if no information is giving when coming up with wire size is 110.14(C)(1) the deciding factor of what column to use. I have always used 60 degree column for residential and 75 degree column for commercial. I would asume that that is because in order to be commercial rated the termination rating of the gear has to be 75 degree rated.
310.15(B)(16) and 110.14(C)(1)
- Thread starter JdoubleU
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Don't assume. If it's marked you can use the column equivalent to that marking. If not, you have to use the "basics". More often than not nowadays, terminals and equipment are marked for 75?C... but again, do not assume.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
It is not 60C for residential and 75 for commercial. If there are no markings then 110.14 (C) tells use to use 60C for 100 amps or less or for wires up to 1 awg and 75C for circuits over 100 amps or wires larger than 1 awg
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