I have a project where the documents currently call for 3-800A feeders each from an 800A c.b. in some outdoor swtichgear the plan shows them going undergrouond for about 6-8' then up the exterior of the building into a "LB" thru the wall into the ceiling space of the adjacent space running about a additional 75' into the mcc / switchboards they are serving. my question is after pulling from the swbd down over up to the "LB" can you install 500's in a 4" "LB"? will the contractor be able to fit the cover back on after bending the cable almost 90 degrees? I suggested a pull box for each conduit 6"w x 12" high? I am looking for some contractors opinions as I am not a contractor and have never installed anything this size before? Thanks in advance for your input.