My bathroom has two doors. There is a light switch outside one door. I
would like to put a 3way switch outside the other door.
Putting in the new switch is easy enough, as is running the cable through
the attic and down to the old box, but how do I get the cable into the the
first steel box? Since I do not have access to the outside of the existing
box, I cannot put a cable clamp on it. Do I just live without a cable
clamp? Obviously I can not secure the cable to the wall, as required by
code either. It seems to me that any work like this will be against code
unless you rip the drywall off. Any help would be appreciated.
Do you really have a clear shot? Are there any firebreaks and/or diagonal
but how do I get the cable into the the
Most metal boxes that I have used have clamps that can be added through the
inside of the box. You may have to salvage an old box or buy a new box in
order to get the clamps.There are also plastic snap in cable clamps that may
work here. That is if the box has a standard 1/2" KO where you need it.
Obviously I can not secure the cable to the wall, as required by
Staples are not required for retro work in finished walls (NEC 336-18
exception 1). Most of the reasons for staples are to keep the cables from
being caught sheetrock panels and studs during original construction etc.
Staple it where you can in accessible locations such as the attic.
Any help would be appreciated.
Most of the time when I am in your situation I end up prying out the old
box. If I destroy the box or can't get it out of the wall without damaging
the sheetrock to much, then I just let it fall into the wall cavity. Then I
drill up/down through firebrakes if needed and fish the new wire. Then I
install a new box.
Not completely legal but I've seen one case where a cable clamp
was put in from inside the box (inside out but it clamped the
cable OK!). Or change the box to one with built-in cable clamps.
Or niggle away the plaster sufficiently on one edge of the box to
put a cable clamp from outside and then use a much bigger
'decorative style' switch plate to cover up the broken plaster
edge adjacent to the box? I've seen switch plates twice 'normal
As someone mentions there are plastic cable clamps which, sort
of, 'snap' into place. Also there are plastic boxes that have the
sort of clamp that mainly 'rests' on the incomiing cable and
prevents it from pulling out of the box, thus avoiding any strain
on the actual wiring connections. Browse around an electrical
supplies place for ideas.
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