I have 3 loose Romex 12-2 w/ground cables (2 white, 1 black both NM) running from holes in the floor of a second story bedroom closet through the ceiling and into a hole in the attic floor. They are not stapled to the walls - merely hanging there.
Both nearby walls are loadbearing - one is the exterior wall with chimney and the other has double 2X4s at the top. The closet entry is almost flush with the corner and I don't like the idea of drilling holes through the tops of either of these walls.
My first thought was to bundle the wires together, put them in some type of sheath and attach it to the corner of the closet where the two walls meet. This appears to be against the code as the wires might overheat inside conduit. Another thought was to nail a 1X4 (would drywall be more fireproof?) on top of them from floor to ceiling (crosssection would be a triangle) as this would protect them but this brings up the overheating question.
Any suggestions? Can they be safely run in large conduit? Thanks!