I'm trying to connect a 4/3 nm feeder cable into to my exterior mounted service entry / main panel.
There is already what looks like a 1 1/2" rigid conduit from the crawlspace through the rim joist up into the bottom of the panel that all of the houses wiring currently uses:
There are only 9 single pole circuits (so 18 conductors?) going through the conduit already so I believe im way under the fill capacity for a 1 1/2" conduit. However, it still is pretty tight to physically run my 4/3 cable through it:
I'm worried if I run the 4/3 through the existing conduit I will be over capacity or the inspector will complain im jamming too many wires through it. Should I be worried or just put the cable through it anyways?
My next thought was to just run another conduit turn next to the existing one to put the feeder through. The first problem I ran into was that my box only has 1" knockouts left on the bottom. I tried to bend the 4/3 cable through a 1" LB fitting and, although the fitting itself said it could handle 4 #4 conductors, it felt like cramming it in there was not going to work. If I upsize to 1 1/4" it seems like it will fit, but then how do I connect the 1 1/4" conduit to the 1" hole in the box? Do they make "reducing" hubs? What kind of fitting(s) would let me do this?