How To Run Conduit Though Floor Joists

Area in the middle of the 2 10.

How to run conduit though floor joists.

Position bathroom vent fans so the ducts can run parallel to the joists right up to where they exit the house. Smaller wires must be run through bored holes or be attached to a running board. Diameter plenty big enough for running cable. In the case of your 2 10 joists the maximum diameter is 35 64 in.

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. Running stiff conduit through joists. Since metal conduit is not flexible like romex though you cannot fish the conduit through the studs. To ensure the joist remains strong the hole needs to be drilled in a specific location to avoid further weakening your floor.

However the flexible conduit is super expensive and i can t get it locally so i was hoping to use some stiff conduit pipe pvc that i can get at my local hardware store. Wires to the bottom of a floor joist unless the wire is 6 2 8 3 or larger. Make sure not to install joists so they run parallel to and directly under walls where you intend to install ductwork. Therefore you have to take your runs vertical to the ceiling.

The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1 4 in is 3 3 4 in. Notches can t be deeper than one sixth of the joist depth. One reason you are not allowed to run wires across the bot tom of floor joists is to eliminate the temp tation to use the 12 2 wire for your kitchen gfi as a place to hang laundry. To minimize problems with ductwork.

If you need to cut through a joist firm up the floor as shown in fig. Of solid wood between the top and bottom edges of the joist and the edges of any hole. You can drill the holes anywhere along the length of the joist first photo. Running the cable in the crawl space.

That gives you a 5 1 4 in. 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. 1 set a stepladder below one floor joist requiring a hole for romex. When running romex you typically would route from one outlet box to the next by drilling holes in your studs and fishing the romex through said holes from box to box.