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In the first video on running electrical wire and cable through the wall, we ran wires up to a spot directly behind where our flat-panel TV is mounted. In this video, we’ll finish the job by installing an electrical box and receptacles where we can plug in our TV wires so they’re hidden from view.


  1. 1.mix

    Purchase a new electrical outlet based on your project's needs.

  2. 2.plastic sheet

    Remove the old outlet and single gang box (if existing) and install the new double gang box by placing it over one side of the existing cutout and tracing the perimeter of the rest of the box on the wall.

  3. 3.spray

    Cut out the hole with a drywall saw.

  4. 4.lead test

    Fish the two new wires through the wall to the opening.

  5. 5.scraper

    punch through the knockout tabs on the back of the box using a hammer and screwdriver. This is where the electrical cables will enter the box.

  6. 6.sanding

    hook up the coaxial cable and HDMI cords to the back of the plate before screwing it into the gang box.

  7. 7.sanding

    strip the ends of our new electrical cable using these wire strippers.

  8. 8.sanding

    Pull the wires through the knockouts of the electrical box and fasten the box to the wall.

  9. 9.sanding

    Connect existing and new cable to the outlet. Black wires to the hot side and white wires to neutral side.

  10. 10.sanding

    For the ground wires, create a pigtail and connect it to the green ground screw on the outlet. Then connect the ground wires to each end of the pigtail.

  11. 11.sanding

    Screw the outlet into the double gang box.

  12. 12.sanding

    Repeat this process for the electric box that will be place behind the TV.

  13. 13.sanding

    Turn the power back on and test the connections.

  14. 14.sanding

    Add metal clips on the studs to prevent future nails from reaching the cables. Hammer into place.

  15. 15.sanding

    Repair the holes in the wall by placing the cut-out pieces back into place and secure with. Watch Repairing Drywall for more information.


Project Faqs « back to project

Do you have a screw for an electrical outlet cover?

In most cases they are a 6 –... More »

Should I use the screw terminal or the holds in the back of the electrical outlet to attach the wires?

Technically, you can use either one. But wires “backstabbed” into these holes (as it is called) are more likely to fall out, which could start a... More »

Will a stick-on hook hold much weight?

They are really only designed for towels and other lightweight... More »

Can I hook a 1-¼ inch drainpipe to a 1 ½ J-bend trap?

Yes, use a reducing slip joint rubber or plastic... More »

I’m adding an interior wall and I want to make sure the studs will be plumb. What’s the best way to do this?

You can layout the top plate of the wall (generally with studs spaced 16” on center) and then use a plumb bob to plumb down to layout the... More »

Can I plug my air conditioner into any standard outlet?

Check the voltage rating of the unit. Units with 115 volts (having less than a 9,000 BTU capacity) will not overload average house wiring. For... More »

What is the easiest way to test an outlet?

Use a receptacle analyzer. Leave the power on, but make sure nothing is plugged into any outlet on the circuit, and turn off all switches on the... More »

What type of wire should I use for a 220-volt outlet?

The best choice is one is a three-wire cable with a ground. Also, make sure it’s rated for the amperage you... More »

What do numbers on electrical cable mean?

They refer to the number and types of wire inside the cable. For example, 14-2 means the cable has two 14-gauge wires inside. 12-3 G means the cable... More »


What do the numbers mean on electrical wire?

A wire marked 14/2 means that it's a 14-gauge wire and it contains two wires inside the insulated... More »

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