I would like to have a better understanding of the "degree" columns and ampacities of various wire types.
My basic understanding is that I can use the 90deg column to start derating calculations. Other than that I am pretty much just blindly using the 75deg(unless of course the wire is listed in the 60deg column) column, assuming that all the equipment I am using has at least this rating.
We use a lot of THHWN, which is a 90deg wire, is there ever a time I can actually use the full 90deg ampacity? Is a lot of equipment rated to 90deg?
Do you'll use rules of thumb here or are you checking ratings of every piece of equipment you have and going from there?
What is a reasonable way to make this table useful, without assuming too much and doing too much guesswork?
My basic understanding is that I can use the 90deg column to start derating calculations. Other than that I am pretty much just blindly using the 75deg(unless of course the wire is listed in the 60deg column) column, assuming that all the equipment I am using has at least this rating.
We use a lot of THHWN, which is a 90deg wire, is there ever a time I can actually use the full 90deg ampacity? Is a lot of equipment rated to 90deg?
Do you'll use rules of thumb here or are you checking ratings of every piece of equipment you have and going from there?
What is a reasonable way to make this table useful, without assuming too much and doing too much guesswork?
