I am running buried 4/0,4/0,2/0 from meter loop to a metal building. Unfortunate, I wasn't able to run conduit through the slab, so have to bring the cable up on the outside of the building and then go through the wall to the sub-panel on the interior. What's the best way to transition from outside to inside. Can't really bend cable that large at 90 degrees. I want the cable to come up right next to the exterior wall. Thinking there might be some sort of box that has lugs where I can connect outside and then just do a sort run through wall into sub-panel bus bar. Thanks.