I am working on an old house. The garage ceiling (attic floor) has exposed beams (ie. it doesn't have sheetrock on the underside that provides for a finished ceiling). The power to the garage door opener and to the outlets on the other side of the garage go through a romex that is stapled to one of the beams. It goes into an outlet for the garage opener to connect to and then continues to the other side of the garage and hides inside the wall. Do I need to insert that romex inside a conduit sleeve? Or, is it okay being "exposed" like that? The ceiling is about 8.5 ft height so it is not within reach for a typical person. Also, the outlet box is nailed to the beam and has a typical cover but it is also "exposed". It is a metal box but it is grounded.