Now, about bonding the GEC to the conduit . . . Some have expressed fears that should the GEC not be connected to the conduit at BOTH ends, a "choke" can occur that will reduce the current carrying ability of the wire. Personally, I think this is a non-issue. I defy you to run a bare #4 wire through bent pipe without the wire contacting the pipe at several points.
None the less, a connector is made for this task. I've used them several times, and I've attached a catalog drawing of one. Alas, electrical supply houses here have exactly zero interest in obtaining them. Indeed, they look at me as though I'm out of my mind for wanting such a thing. ("I've been in this business forty years and never had anyone ask ...")
Time waits for no one, so I had to improvise. I've attached a picture; combine a rigid coupling with an NM 2-screw connector and you get something that just might work. Picture attached.
