I hired an electrician to replace an illuminated bathroom medicine
cabinet with a wall light fixture over a mirror (and do a bunch of other
stuff). The medicine cabinet was supplied by house original (40+ yr
old) NM wire running through a hole in the plaster (no box) into the top
of the medicine cabinet. The new light fixture (with box) is higher and
to the left of the original hole. There is a stud between the original
hole and the new box.
The electrician ran the wire in front of the stud in an exposed hole,
then back inside the wall to the new box. He removed some wood from the
stud, but wire isn't any deeper than the back of the plaster.
I want to seal the hole even though there will be a mirror in front of
it. Unfortunately he was gone before I saw his method--although
drilling in the middle of the stud would have required opening up the
wall. How do I fill this hole properly? If I use a spackling compound
it will be pressed into the NM wire where it crosses in front of the
stud. Even if that is ok, it would be bad if someone put a nail or hole
there since the wire is so close to the plaster/spackling and it doesn't
look like there would even be a wire there, since it is well below and
to the right of the new existing light fixture.