Power inlet box in crawl space
I'm about to install a power inlet box in my 6-foot-high crawl space and I have a few questions:
1. The box will be mounted on the concrete wall and I need to run the 10/3 wire up the concrete before entering a hole in the wood above the concrete. Is conduit necessary on a wall in a crawl space? (If so, I realize I can't put 10/3 in conduit. I'll use individual 10-gauge THHN conductors.)
2. Does code require I mount the power inlet box on plywood attached to the concrete wall?
3. Is there a minimum height the box should be mounted from the floor?