Sounds like you are planning to add an outlet high on the wall behind
where your new TV will go.
You may not have to remove the box from the stub of the existing
outlet you are going to tie in to. You could remove the cover plate
and make the drywall hole a little bigger and fish the wire down to
the bigger opening. Of course trying to then get it into the box will
be a PITA.
If the new outlet will be directly above an existing outlet I would
start insode the existing box and send a straightened coat hanger (or
fish stick) up from the inside of the existing box to the new hole.
Then attach and pull the wire down into the box.
If that won't work you'll most likely need to cut the nails holding
the box to the stud. Sawzall or a multi-master would be ideal for
this. A bare hacksaw blade would also work but take quite a bit of
time. Just run the blade of whatever tool along the outside of the
box next to the stud. On *rare* ocassions you can grab the nails from
inside the box and pry them out using diagonal cutters.
I had the same situation. I got lucky because my existing outlet was
in the same "stud bay" where the new TV outlet was going, so no need
to drill though studs.
I managed to remove a 1/2" knockout in the existing box and snake the
new wire up to the new box. Now the question was how do install a
romex clamp in the old box? Well I used this pop-in plastic clamp on
the inside of the box:
What's nice about this clamp is you don't have to remove the old box
to put the clamp in from the outside. It is a low profile clamp, does
not intefere with the inside of the box.
I assume you are trying to conceal the wiring in the wall. You never
mentioned if that is what you're trying to do.
Most electrical boxes have multiple locations where wiring may enter
and exit. Pop open another opening. Use a screw-in clamp to follow
code and seal it. Nails can also be pulled loose if you want a
different box. Perhaps you should have somebody else do the job if
this sort of thing is news to you.
I was lucky- when I had to add an outlet on the tail end of a string
like that, I just removed the knockout from inside the box, pushed the
romex up the stud bay, and grabbed it from the hole I had cut for the
old-work box on the other side. Didn't have to do any puttying or
painting. Secured it in the old box with the internal clamp already there.
Gotta couple other places where I really ought to do the same thing, to
make vacuuming easier. Who makes a hall with NO outlets, even back in
1960? Borrow power from outlet in same stud bay in adjacent bedroom, etc.
and of course, what ever wiring in additition to power that is snaked thorugh
will be obsolete by the time the next TV is purchased. Nowadays it hdmi is
current. From where? Cable boxes are mostly still analog to the box.
RG6 RF ATSC to the tv from an antenna? Otherwise it means an external box
from the cable company or satelite company.
Going to have a shelf under the TV with the cable box or satelite tuner? Ruins
the athethetics right there. Might as well run the power and cables in a short
run of surface mount contuit and be done with it.
Just leave a heavy string or light rope to pull the next type of wire
through. Besides, I didn't see the OP (it wasn't quoted) and read it as
using the clock outlet to plug in the TV. I think we'll be using romex
for a while yet.
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