... I'm trying to size an indoor trough for the 300 amp service we're working on... I'd be coming into the top of the trough with a 3" pipe,and exiting through the bottom of the trough into (2)150 amp panels via (2)-2" nipples... My recollection is that since this will be a straight pull,I must go with 8 times the largest diameter pipe,which will give me a minimum of 24".. the other dimension large enough to accomodate lock-nuts...will a 24"X 8"X 8" trough be adequate?? my supply conductors will be 250kcmil copper..also I must bond this trough,as I'm using PVC nipples..what size bonding wire should I go with??
Russ
