How to you connect the derating factors of 310-16 with the 60? and 75? columns?
For instance,using good ole THHN to carry 55 amps at 100? with 6 conductors, I know enough to try #8 and to multiply 55 X .91 X .80 = 40.04 amps. So I try #6 wire and get 75 X .91 X .80 = 54.6 amps which is good enough for me.
But if I am using 60? Centigrade devices, then the first column says I have to use #6 gauge wire.
So now I am confused. :roll: How does this work?
For instance,using good ole THHN to carry 55 amps at 100? with 6 conductors, I know enough to try #8 and to multiply 55 X .91 X .80 = 40.04 amps. So I try #6 wire and get 75 X .91 X .80 = 54.6 amps which is good enough for me.
But if I am using 60? Centigrade devices, then the first column says I have to use #6 gauge wire.
So now I am confused. :roll: How does this work?