We're selling our home and the buyer's inspector says the white cable in these photos must be protected from damage, by either a conduit or instead using a metallic cable. It's connected to the furnace, which is in our attic (no stairs/ladder access -- a ceiling hatch 6.5 feet away, instead).
The furnace installer, the electrician, and another home inspector all say it doesn't need protection. If these folks are right it could save me an expensive electrician visit that it sounds like I don't really need!
I would love it if somebody could cite the code for me so I can give the inspector more than just a bunch of opinions.