All the visible cables in my attic are old armored cables, thus protected from possible critters trying to chew them (I've had squirrels there before) and other forms of direct impact.
As I'm doing some rewiring and have a large amount of leftover NM (romex) cable, I was wondering if I can run that just sitting on top of and secured to the joists in the attic, like the current armored cable is. I can certainly go buy MC cable (metal-clad, which is like a modern version of my archaic armored BX that has aluminum wire and no ground) but would rather use what I have left over.
Best Answer
Yes. NM cable may be exposed in attic.
This is very common in modern dwellings. Armored cable / MC is not necessary in your case.