Run Thhn Through Attic

If the wires are within 7 of the attic access hole or along any attic flooring you ll need to protect the wiring from damage with furring strips along each side of the wire run.

Run thhn through attic.

Which is jacketed cable to be run through the attic without conduit because it is packaged together already with a jacket around it they consider the attic to be inaccessible indoor location. A favorite target of electrical inspectors is the improper use of non metallic cable nm in exposed locations such as basement foundation walls or along the face of studs and joists in unfinished framed spaces. Once inside the attic i think it s the thhn listing that is being used. If the sites that you want to run wire to are on the outside of the house you should not need to drill a new hole.

If you drill holes in the joists and run wire through those holes you ll be disturbing the insulation. I should say thhn thwn 2 wire. When cutting through drywall from the interior of a room use a utility knife and cut carefully you don t want to drill through a hidden wire or the paper backing of the attic insulation. I am thinking about using it for some indoor wiring projects and i don t know if i need to run in through plastic metal conduit or not.

I have a 20 amp feed on 12 amg romex terminating in a metal 4 x 4 junction box in the basement. The national electrical code which is the basis for all local building codes has specific regulations for installing electrical wires so that they are protected from damage. From this i. I have a bunch of 12 awg red black white green thhn.

My run goes 20 across the rafters in my garage through the wall into the attic runs another 40 across the rafters in the attic and exits the attic through a 2 vent hole under the eaves at the rear of the house into an oversized lb fitting.