Mach1
noob
- Joined
- Nov 11, 2005
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About a year ago, I wired my attached garage with a subpanel. My sub in the garage is only 15 feet or so from the main. I used 4 AWG THHN 90C for both hots and netrual, 6 AWG bare stranded for the ground. The conductors are installed in 1.25" PVC 90C rated conduit.
The table I looked at when I bought the wire said #4 was good for 95A (w/90C insulation) My breakers are the Cutler-Hammer BR type. Since there was no 95A breaker avaliable, I used a 100A.
In hindsight, I'm wondering if using the 100 Amp BR this was the right thing to do? Should I switch it to a 90A breaker? The only reason I can think of to change it to 90A would be because of de-rating due to conduit fill. Can someone help me out?
TIA,
Mach1
The table I looked at when I bought the wire said #4 was good for 95A (w/90C insulation) My breakers are the Cutler-Hammer BR type. Since there was no 95A breaker avaliable, I used a 100A.
In hindsight, I'm wondering if using the 100 Amp BR this was the right thing to do? Should I switch it to a 90A breaker? The only reason I can think of to change it to 90A would be because of de-rating due to conduit fill. Can someone help me out?
TIA,
Mach1
