How to Install an Electrical Floor Outlet into Tile

Floor outlets are such important elements in many large and open rooms. If you are looking to install this type of outlet, you can save some money by doing it yourself. Please note that it is important that you do have basic electrical and wiring knowledge before you begin any job. Be sure you always follow local and national electrical codes while you work. Also be sure to read the manufacturer’s instructions carefully. A floor outlet is convenient when you wish to place lamps or other objects in the center of the floor where it would be too far from a wall outlet.  They are constructed in such a manner that when not in use, they can be walked on and not be damaged. 

Step 1 – Turn Power Off

The first thing you must do when working with anything electrical is to be sure the power is turned off. If you are replacing an existing outlet, you should turn off the power to it. Often times the breakers are marked by the builder but sometimes they are incorrect. You may have to turn the breakers on and off, one by one, until you locate the correct one for your wire source. Always be sure to test with a circuit tester to be sure power is off while working. 

Step 2 – Determine Box Location

Be sure the area you choose has no wires or plumbing that can be damaged while you drill and install the box. Also be sure that there is enough clearance below the floorboard for installation of the floor box. The manufacturer’s instructions will provide the depth necessary.

Following the measurement instructions of the outlet manufacturer, cut a hole in the tile.  You can use an expensive carbon grit hole saw but it is probably easier to use a carbon-tipped masonry bit and drill a small series of holes. Draw a circle using the outlet template and drill a series of closely spaced holes along this line.  It is best to wear safety goggles when you are drilling these.  With the hammer, tap very lightly along the line of holes.  This may take a few minutes but the center of the hole will come out.  Now use the hole saw and drill a hole in the subfloor.  You may need to break off little bits of the tile for the hole saw to fit as your hole in the tile will be jagged.

Step 3 – Connect Wires

Fish the wires into location and connect the existing wires to the color coded on ones the new receptacle using the nuts provided, i.e. green to green, black to black, white to white. 

Step 4 – Install Outlet

Push all the excess wires in the hole but clamp the romex, bent over, to the bottom of the box floor.  Reinstall the bottom plate and clamp.  The romex will exit into the bottom of the cover plate and is held by screws.

Place a bead of caulk on the floor around the outlet hole and place the assembled floor box into the hole, being sure it is well seated. Place the cover plate over the top and screw into the subfloor.  

Step 5 - Test

Test for proper operation.