Running Electric Conduit Before Pouring Concrete Floor Garage

Installing conduit under or in concrete slabs protects the wires from the weight and corrosion of the cement.

Running electric conduit before pouring concrete floor garage. It also allows future expansion of the electrical system by pulling additional wires through the conduit. Hold it against the ceiling and mark the top edge of the electrical box on the conduit. You ll have to cut a trench in the concrete for a pvc conduit which will carry the electrical cable under the floor. In my opinion you would be wise to place 2 conduits under the level of the concrete.

You can stub out pipes in a concrete slab easily because the stub out is put in place before the final grade for the concrete slab is prepared but you must be very skilled in making the necessary connections for the pipes. It s tempting to start by attaching all of the electrical boxes to the walls and ceiling and then run the conduit but don t do it. This allows you to install the conduit under the slab in a location where it is well protected. The 2 conduit need to be separated at least by 6 more if possible.

The best time to run conduit is before your pour the concrete slab. You must stub out toilets water lines and electrical conduit as well as main utility lines that enter the building from below the foundation and rise up into the building. This with keep the concrete from cracking over the pipe it acts as a control joint but on the underside if into the concrete. You ll run conduit from here to the next box.

It s easier to secure one box and then run the conduit from that box to the next one. The best spot for that trench will be underneath a flooring strip that runs perpendicular from the nearest wall to the spot where your island will be. Connect a 90 degree bend to the conduit. Ridged nonmetallic pvc conduit is the right material for this job because it is watertight inexpensive and easy to work with.

We used a single gang to 4 in. To get started screw a metal box extender to the outlet box.