I'm a little confuse again on conductor derating. Can some one put me back on the right track.
Say a general Test question ask, You have a 1" EMT conduit with 5 #6 THWN wire. Temp is at 107 F. What is the amp of the wires?
I understand how to derate but I get confuse of which coloum to use to get my ampacities now. I was on you tube and saw mike holts nec 2011 conducotr size terminal rating. He said that if they don't specified the ampacity terminal rating, then you have to use 60 degree coloum for derating because of 110.14 (c)1. In T 310.15(b)(16) off the 2011 nec, they have 60 degrees,75 degrees or 90 degrees coloums. I see that THWN is in the 75 degrees and thats what I always did. Do I derate the conductors in 60 degrees or 75 degrees coloum? Do I go by what type of wire it is which is 75 degrees for THWN?
Say a general Test question ask, You have a 1" EMT conduit with 5 #6 THWN wire. Temp is at 107 F. What is the amp of the wires?
I understand how to derate but I get confuse of which coloum to use to get my ampacities now. I was on you tube and saw mike holts nec 2011 conducotr size terminal rating. He said that if they don't specified the ampacity terminal rating, then you have to use 60 degree coloum for derating because of 110.14 (c)1. In T 310.15(b)(16) off the 2011 nec, they have 60 degrees,75 degrees or 90 degrees coloums. I see that THWN is in the 75 degrees and thats what I always did. Do I derate the conductors in 60 degrees or 75 degrees coloum? Do I go by what type of wire it is which is 75 degrees for THWN?