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Discussion Starter · #1 ·
Any body can tell me
what is derating factor when my feeder passing across the roof

I have 50 feet of I-1/ 2" emt, (3)#3/0 thhn, cu feeding a load of 170A

My Derating: 200A x .82=164A than,
I would use 4/0 ???

tanx
 
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