Electrical Conduit Through Exterior Wall

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.

Electrical conduit through exterior wall. You will need to choose the right size of the drill bit. You need to make a transition from nm cable s to exterior pvc conduit. It is also used in unfinished areas like basements crawlspaces and attics and for surface mounted installations outdoors. Use screws and faster the box to the looks like wood so use some longer wood screws about 6 and fasten it tightly to the wall.

The first thing that you will need to do is to drill a hole in the wall. How to run conduit through exterior wall step 1. The best way is to clean the area behind the box on the outside wall. Use water resistant silicone and apply around the pipe area and on the edges of the square.

Either rigid or flexible conduit protects the wires and is used in exposed locations such as along the exterior surface of a wall. The 10 foot lengths of rmc are threaded on both ends and include a coupling on one end. Below we have provided a step by step guide to help you to install a conduit through your exterior wall. Running the conduit through the wall to an inside box is the most difficult step.

Drill a hole in the wall. Slide a short piece of schedule 40 pvc conduit through the structure s wall so that you can attach an lb fitting onto it. The material used to make a rigid conduit can be connected with watertight removable fittings or glued together using pvc cement. I advise an interior surface mounted metallic outlet box with a thru the wall pvc conduit nipple between the interior outlet box and an exterior pvc lb fitting the lb is used for making a horizontal to vertical change in the direction of the pvc with the body of the lb in line with the exterior pvc.

Electrical conduit is metal or plastic pipe through which electrical wires are run. The rigidity of this type of pvc conduit makes it suited for use both above and below ground. The size of conduit that is needed will be depend on the number and size of the electrical wires being run through it based on tables c9 and c10 of the national electrical code. There are two ways to run electrical wiring on the exterior walls of a house or other structure.

Use outdoor silicone caulking around the conduit at the structure in order to hold the conduit into place and keep water from going inside your structure. One method is to run individual wires in a conduit system such as intermediate conduit rigid. 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.