We are installing a new oil filled transformer and will be penetrating the oil pit liner. The drawings indicate the conduit immediately turning up to a field termination cabinet. The conduit is 4" sch 40 PVC, the cable will be 3-1/C 350kcmil. The engineer says the conduit needs to penetrate the liner at a right angle and to use a 90 degree LB fitting to turn up as we don't have room for a sweep. As this will later be filled with stone, is it acceptable to use an LB fitting that will be below grade? I've never done this before, but am drawing a blank if it's permissible. Thanks for any input. Greg
