In order to extend my shop slab I need to dig up a power line to my garage -- it's in my way. And as long as I have to dig it up, I'll be running 220V to the garage with a sub-panel out there. But this gives me a choice of running the conduit up the outside wall of the shop...or of having the conduit come into the shop thru the slab near the outside wall. What are the pros and cons of penetrating the slab like that?

Pete