On Jun 3, 10:20*am, bud-- wrote:
N8N wrote:
12/2. You'll run three hots and two neutrals, plus grounds.

I'm curious if he really has 10/2; wouldn't that be unusual for a
bathroom which I would assume would be a 20A dedicated branch circuit
(hopefully GFCI protected?)

10/2 does sound odd.



Also, I *thought* but may be mistaken - someone correct me if I am -
that current code prohibited using two different size wires on a given
branch circuit, even if the smaller size used was appropriate for the
overcurrent protection device.

You can use any size wire as long as the overcurrent protection is for
the smallest branch circuit wire.

Mixing may or may not be a good idea. It can cause confusion. But on a
20A circuit you might run #10 to a garage for voltage drop and #12
within the garage.

--
bud--

OK, I'm probably full of it there. It's probably 12/2 and 14/2, but
one is definitely bigger than the other. The big one has black outer
coating and the smaller one is white, but I doubt that means
anything. I'll crawl up in the attic tonight and see if I can read
the writing on the cable. In any case, I think i'm going to skip the
heater and just go with fan and light. Gotta figure out which of the
80-odd circuits it's using.

Supplemental question: Any problem with using expandable foam
insulation to seal the box around the hole in the drywall (top down,
from the attic)?