mshields
Senior Member
- Location
- Boston, MA
Typically, I wouldn't run more than 3 single phase, 20A circuits in a conduit. I always run dedicated neutrals and a single ground conductor. So if I were feeding three lighting circuits via one pipe, I'd use 6#10&1#10G; the 10's are to account for the derating required for 6 current carrying conductors.
But what is I were to run say another 2 circuits in that same pipe. If left to my own devices. I'd probably avoid this to avoid the next level of derating but lets say I didn't want to avoid it (or I was taking advantage of a MA exception that allows a lot more than 4-6 for 80% derating. so for the 8 single phase circuits, I'd run 8#8's and here I'd run 2#8 ground. My habit being to run a ground for every three circuits.
My question is, is my habit exceeding what is necessary for ground conductors. Could I get away with a single ground conductor in this instance?
Thanks,
Mike
But what is I were to run say another 2 circuits in that same pipe. If left to my own devices. I'd probably avoid this to avoid the next level of derating but lets say I didn't want to avoid it (or I was taking advantage of a MA exception that allows a lot more than 4-6 for 80% derating. so for the 8 single phase circuits, I'd run 8#8's and here I'd run 2#8 ground. My habit being to run a ground for every three circuits.
My question is, is my habit exceeding what is necessary for ground conductors. Could I get away with a single ground conductor in this instance?
Thanks,
Mike
