09-18-2015, 09:43 AM
I would go with 3 x #6 THHN (+ 1 x #8 ground) in 1.25" schedule-80 PVC conduit.
I believe local code says 24" deep trench with 6" sand on the bottom (conduit 18" below grade) and another 6" sand over the conduit, with a flag (tape or wire) buried along the conduit.
Note1: neutral is NOT bonded to ground in a subpanel.
Note2: you have to go to Alpha for schedule-80 PVC.
Note3: while a 1" conduit is technically large enough for 4x#6, (a) sch80 has a smaller inside diameter (b) larger conduit makes for a much easier pull, and leaves room for expansion.
Note4: digging a trench is the expensive part -- lay a spare conduit so you don't have to do it again.
I believe local code says 24" deep trench with 6" sand on the bottom (conduit 18" below grade) and another 6" sand over the conduit, with a flag (tape or wire) buried along the conduit.
Note1: neutral is NOT bonded to ground in a subpanel.
Note2: you have to go to Alpha for schedule-80 PVC.
Note3: while a 1" conduit is technically large enough for 4x#6, (a) sch80 has a smaller inside diameter (b) larger conduit makes for a much easier pull, and leaves room for expansion.
Note4: digging a trench is the expensive part -- lay a spare conduit so you don't have to do it again.