4/0 4/0 2/0 Al in a junction box. Procedure, please!
I have a trench I want to fill, and before I fill it I want to install 2" Sch 40 conduit for use by a future house. (The meter and service entrance are currently on the garage.) This conduit may have very large wire due to the distance to the future house, perhaps 4/0 4/0 2/0 Al. Therefore I am terminating it in an 8" junction box on the outside wall of my garage, right behind my breaker panel. The bells of the PVC are heading up toward the junction box, and because of clearance issues it would make more sense to feed the cable through the conduit on this end and pull it from the future house end.
If I was installing the cable while the trench was open, there would be no problem; I could move the conduit out of the J-box, feed it through, then glue it back into the box. But what do I do when the trench is filled, and I can't really move the conduit? And I can't move the box without cutting the conduit going to it, because conduit enters the bottom and leaves out the back, at 90 degrees to each other. What is the procedure for this? Is there a part that is used for situations like this, where I can cut the conduit and glue it back together without moving the cut ends apart? Or is it common practice to cut a big hole in the top of a 3R enclosure to pull cable through, and then seal it up?