How to Install a Poke-Through Electrical Floor Outlet

Poke-through electrical outlet installed in carpet floor with plugged cable

The Spruce / Kevin Norris

Project Overview
  • Working Time: 1 - 2 hrs
  • Total Time: 1 - 2 hrs
  • Yield: 1 poke-through floor outlet
  • Skill Level: Intermediate
  • Estimated Cost: $50 to $100

Large living rooms and family rooms face some unique challenges when it comes to wiring. The great rooms that are so popular in "open concept" designs create large expanses of space that are quite some distance from the walls where the electrical outlets are normally installed. What do you do if your room includes a sitting area in the middle? You would like a lamp or two, but you are 10 to 12 feet or more from any wall outlet. Long extension cords running along the floor can be an obvious tripping hazard.

The answer is a floor outlet. Often known in the electrical trades as a poke-through or drop-ina floor outlet has a specially designed mounting plate that fits virtually flush with the floor surface. The outlet receptacle itself is sometimes flush with the floor level, as well; or it can be recessed down below the surface of the floor, with a ​secondary cover plate that covers the receptacle opening when it is not in use.

A variety of commercial products are available to simplify poke-through floor outlet installation. These products can be especially convenient because they usually come with everything you need for a complete in-floor installation, including a special tube-shaped floor box, the outlet receptacle, the wire nut connectors, and even the hole saw required to drill the hole in the floor. Not only can you use them for an electrical outlet, but they also often have adapters that let you use the box to run communications lines, such as a phone line or computer network cable.

Any number of floor box products are also available, some with single receptacles and others accommodating duplex receptacles. Most have flip covers or screw-in covers for protecting the receptacles when they are not in use. Some kits include just the surface cover plate, requiring you to buy a standard electrical box and receptacle separately, while other kits include virtually all the parts necessary.

Safety Considerations

When working with cables and electrical wires, it is vitally important to ensure no power is flowing. Shut off the power at the home's electrical service panel, either by flipping the proper breaker or removing the appropriate fuse.

As with any electrical installation, a good understanding of electrical work is required if you are doing this work yourself. As an alternative, you can install the floor box, then leave the electrical connections to the circuit to a licensed electrician.

Tip

Many of the parts required for this project will be included in a kit. Check to see if the part is included before purchasing separately.

What You'll Need

Equipment / Tools

  • Hole saw (or a jigsaw or reciprocating saw, depending on the shape of the floor box)
  • Drill
  • Wire stripper
  • Screwdriver

Materials

  • Drop-in or poke-through floor outlet
  • NM two-wire cable
  • Single-receptacle or duplex receptacle
  • Wire nut connectors

Instructions

Materials and tools to install a poke-through electrical floor outlet

The Spruce / Kevin Norris

  1. Cut Through Carpeting and Padding, If Necessary

    If you have carpeting, cut an opening in the carpeting and padding to access the wood subfloor.

    Carpet cut with utility knife to access wood subfloor

    The Spruce / Kevin Norris

  2. Cut the Hole in the Floor

    Use a power drill to drill a hole in the flooring and subfloor. Use a hole saw sized according to the instructions that come with the kit. Some kits include the necessary hole saw. Some floor boxes may require a rectangular floor opening; if so, use a reciprocating saw or jigsaw to cut this opening.

    Power drill with hole saw cutting in wood subfloor

    The Spruce / Kevin Norris

  3. Run Wiring to the Floor Box

    Run wiring for a new circuit or circuit extension from the source (circuit breaker panel or an existing outlet on the circuit) to the floor box location.

    Tip

    Make sure that the cable size is appropriate for the amperage of the circuit: 14-gauge for a 15-amp circuit and 12-gauge for a 20-amp circuit.

    Yellow wiring run through circuit breaker panel

    The Spruce / Kevin Norris

  4. Pull the NM Cable

    Pull the two-wire (plus ground) NM cable up through the floor opening.

    NM cable pulled through flooring

    The Spruce / Kevin Norris

  5. Prepare the Connections

    Feed the end of the cable into the bottom of the floor box or tube. Strip about 3/4 inch of insulation from each of the wire conductors (white and black wires).

    NM cable fed through floor tube

    The Spruce / Kevin Norris

  6. Connect the Cable

    Connect the NM cable to the wires on the receptacle. Using wire nuts, connect the wires: white wire to neutral (silver-colored screw terminal), black wire to hot (brass- or copper-colored screw terminal), and the bare copper ground wire to the green grounding screw on the receptacle.

    NM cable and receptacle box wires connected with caps

    The Spruce / Kevin Norris

  7. Set the Box in Place

    Tighten the wire clamp holding the cable in the box. Insert the box down through the hole in the floor.

    Floor box inserted into subfloor hole

    The Spruce / Kevin Norris

  8. Secure the Cover Plate

    Fasten the cover plate to the floor, using the provided mounting screws.

    Cover plate fastened with mounting screws to floor

    The Spruce / Kevin Norris

  9. Connect the Cable

    Connect the new NM cable to the circuit breaker panel or to the source outlet being used to feed the new extension.

    Warning

    This is work that requires the circuit breaker panel to be shut off, and it should be done by a professional. Do not attempt this yourself unless you are very familiar with electrical work and confident in your skills.

    NM cable connected to circuit breaker

    The Spruce / Kevin Norris

  10. Power and Test

    Turn the power to the circuit back on and test the new floor outlet for proper operation.

    Floor outlet being tested with extension cord

    The Spruce / Kevin Norris