1 1/2" drill bit for the conduit to go thru and then caulk abound the conduit at the penetration.
I use it outside with no problem at all. Just use the PVC cement called for, and it will work very well.
Depends on the wall, just don't use a bit too large like the "Hillary" bit since that has ample space for more than 3 screws in it.
This works very well outside
solvent weld, "PVC cement".