Finishing my basement.
I have 2" foam insulation against concrete wall, with 2x3 stud wall immedia
tely in front of that.
When I run electric wiring for outlets, am I obligated to drill through the
studs (with 1.25" min cover from the front edge of the studs), or am I all
owed to gouge out some insulation behind each stud and squeeze the cable be
tween the insulation and the stud wall?
I want to do what's right.
Experienced advice appreciated.
On Thu, 26 Nov 2015 15:20:30 -0800 (PST), email@example.com wrote:
Must be either drilled through or stapled to. Drilled through will
have to be within hald inch of the foam side or covered with a steel
protection plate because you need to be 1 1/2 inches from the front
On 11/26/2015 4:20 PM, firstname.lastname@example.org wrote:
Are they *really* 2x3's? I.e., 1.5 x 2.5"
Drill the studs. If you've already framed the wall and getting a drill's
chuck that close to the foam is problematic, consider using a plunge router
from the front face of the stud to route a channel -- with a protective plate
to cover up your sins.
If you haven't framed the wall, yet, consider drilling the *cut* studs
before installation -- then just threading wire through them after
If you are certain that you are maintaining the 1.25" from the face,
you could lay it in behind the insulation BUT you still might want the
nail plates if you think you would ever hang anything there. That
assumes you know where the studs are and don't just go fishing with
the drill. Since you have the depth, sleeving the wire in EMT
(conduit) might be the best way to go.
Instead of just "gouging out" the insulation, cut out a slot 2" wide
and cut a long plug you can seal it back up with when you are done
I am a licensed electrician in Massachusetts, Rhode Island and New Hampshire.
Typically it is easier to run your wire overhead and come down to each
If you are using solid foam insulation, cut out a piece 1 inch wide from above,
to the box.
Turn that piece sideways and cut away enough foam to allow room for your non
metallic sheathed cable (Romex).
Run your wire down to the box and back up and over to the next box.
National electric code requires a Romex staple over the wire typically within 8
inches from where it leaves the box, on the same stud that the box is mounted
Replace the foam over the wire.
Now you can install gypsum board wall or the plastic interlocking panels used in
Code requires arc fault protection for receptacles.
If you have more than 3 receptacles an arc fault circuit breaker is more cost
Code requires ground fault protection on receptacles in an unfinished basement.
A combination arc fault/ ground fault circuit breaker can be installed to cover
your entire basement.
Electric code is written by the national fire protection agency.
It is a minimum standard for electrical installations to prevent fires or deaths.
the suggested circuit breakers will comply with the code if sized correctly to
the size of the wire you are using.
American wire gauge # 12 for a 20 amp circuit breaker.
I know this may have been too much information, but now you have enough to do a
correct and safe installation.
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