I'm digging a trench to run XHHW-2 1/0 wire to a pole barn. The location where my LB enters the house is about 18 inches from the knock out on the main panel where I need to pull the wire into the main panel. I'd prefer to not run conduit inside the wall because it adds two more 90 in the conduit run. Once the LB enters the wall can I just run the wire in the wall without conduit to the main panel? For my case it would be about 18 inches or so. Is this ok according to code?