gatorfrost
Member
- Location
- Winter Haven. FL USA
I have one 4" conduit feeding a 400 amp panel. I would like to run 6 - 250 AL with no neutral. I am on the understanding for derating purposes you can use the 90' column. That would be 230 amps times 2 = 460 amps. I have to derate by 80%, bring me to 368 amps. The next biggest breaker size is 400 amp. Am I correct in my thinking. The total load of the panel is 308 amps. Please let me know one way or the other if I am right or wrong. Thanks