Old house, need to replace a wire where the insulation has been stripped off from when the original installer pulled it through a joist. Normally I'd just follow the original path of the old wire, but in this case it runs through a return air duct:
I believe it's NEC 300.22 (B) that states that I could do this exact thing with MC cable, EMT, IMC, and rigid conduits, but there are supply ducts are on the other side (so no conduit) and I'd like to not mess with MC unless I need to. I think this leaves me with the option of either:
EDIT: Plenum runs the whole length of the basement, have to go under or through Routing the cable around the duct (would have to take circuit to the center of the basement, and then back to get around the plenum)
Putting up a running board across the bottom of the joists / tack wire to running board (NEC 334.15(C))
Am I missing any other options? I also thought about running a conduit along the joists, but I think the running board would be cheaper.