here is the setup you have several ac units all 480 volt 3 phase each unit pulls 22 amps, the runs are over 100 ft. we are running inch and a half 1 1/2" EMT inside that we are running 36 wires all #10 thhn now I am being told that I only have to derate my wires to 80 per cent?
Would you guys run this many wires in there and is this correct for derating ,I think it needs to be dropped to 40 per cent according to the derating table ,but these guys are trying to tell me that is for heating purposes only Ihave been looking at tarticle 310 on adjustment factors any feed back or am i ok at using 80 per cent


MAY THE SUN SHINE ON YOUR FACE IN THE MORNING AND YOU AWAKE WITH A SMILE