You are right about the 8/3, but 334.15(C) specifically refers to NM.
320.15 says that AC cable can run on the bottom of joints, but the section
on MC does not address the issue. I take that mean it is okay. But is it?




"RBM" rbm2(remove wrote in message
...
You can run 6/2 or 8/3 or larger across the beams. You can run smaller
cables if you install running boards next to them for protection



"Toller" wrote in message
...
I need to run 10/2 the length of my house, which means drilling holes in
about 50 joints and avoiding heating ducts. It would be so much nicer
just to fasten the cable to the bottom of the joists. Can that be done
with 10/2MC?
I've never used MC before; anything difficult about it?

I know (or at least I think I know) that it can be done with 8/2 so that
might be worthwhile if 10/2BC isn't okay. Is there such a thing as 8/2
aluminum?

Thanks