Capping off an electrical outlet is just another way of saying removing the outlet and wire nutting the wires. It is generally done when you want to eliminate an unwanted outlet and make the box safe, or if doing work in the area and the outlet is in the way. Wire nutting the wires off permanently is fine in a box, but you are not allowed to splice or terminate a wire without it being accessible, per National Electrical Code, or NEC 314.29. (See Reference 1) The wires must be wire nutted in a box and then a blank cover installed , if removing the outlet permanently, to meet the requirements of the International Residential Code, IRC E3806.4 that deals with unused boxes. (See Reference 2)
Things You'll Need
- Straight tipped screwdriver
- Voltage tester
- Wire nuts (Suitable for one, two or three No. 12 wires)
- Blank box cover (Suitable for wet locations if outside or near water)
Turn off the breaker controlling the outlet to be capped off. Remove the cover plate from the outlet. Set your voltage tester to AC volts scale on the highest setting.
Verify that the outlet's power is off by touching one tester lead to a brass screw and the other to the silver screw of the outlet. The outlet should show 0 volts if the power is off to the outlet.
Remove the screws holding the outlet into the box with your straight tipped screwdriver. Pull the outlet out of the box so that the connections are accessible. Loosen the screws holding the wires into the outlet and pull the outlet off of the wires.
Wire nut all of the same color wires together if there are more than one of each, black to black, white to white and bare to bare or green to green. Put a wire nut on each wire if only one of each color are present. If temporarily capping off the outlet for work in the area, twisting the wires together isn't necessary and just tightening the wire nut onto the wire, or wires, is fine. If permanently removing the outlet, twist the same color wires clockwise with pliers and wire nut tightly making sure no copper is exposed below the wire nut.
Turn the breaker for the outlet back on once the wire nuts have been installed so that other outlets on the circuit will work. Push the wires into the box and install a blank cover if removing the outlet for good. Finish any work in the area and replace the outlet when finished.
Turn the breaker back off and remove the wire nuts if the capping of the outlet was for work in the area. Connect the black wires back to the brass screws on the outlet and connect the white wires to the silver screws on the outlet and tighten the screws with your screwdriver. Connect the bare or green wire to the green ground screw and tighten.
Push the wires and outlet into the box, making sure that the bare wire isn't touching any of the other screws, and tighten the screws that hold the device in. Replace the outlet cover. Turn the breaker back on.
Tips & Warnings
- Electrical work should only be done, or at least supervised, by a qualified electrician. Always verify that power is off to the circuit before doing any work on it to avoid electrical shock hazards.
- Photo Credit Jupiterimages/Comstock/Getty Images
How to Wire a Thermostat
Your common electronic programmable thermostat operates off four wires to control both the heater and the air conditioning unit. When you wire...
How to Connect End Caps on Electrical Wire
Connecting end caps, or wire nuts as they are called in the industry, is one of the safest ways to terminate an...
How to Cap Off Electrical Hot Wire
Capping off electrical wires is necessary to safely remove a device from a circuit. A wire capable of being made hot by...
How to Remove Wires From an Electrical Outlet
Electrical outlets do not feature any moving parts, which makes them particularly durable. However, the electrical contacts within the outlet will wear...
How to Terminate a Stranded Wire at an Outlet
When you are working with electrical wires and circuits, you want to make sure that every wire is connected to something or...
How to Cap Off a Light Fixture
If you've got an old light fixture in an area where you don't need a light, and you don't want anything there,...
How to Cap Electircal Wires in a Junction Box
Terminating electrical connections in a junction box requires a connector capable of insulating the end of each wire without coming loose. Bare...
How to Cover Electrical Outlets
New parents should always childproof their home by covering electrical outlets when they are not in use. You may also wish to...
How to Tie Off an Electrical Plug
If you have an inactive electrical outlet on your wall, you can close it off and place a blank plate over the...
How to Replace an Outlet With a Switch
You can replace an outlet with a switch by deactivating the circuit and then capping off the white wire and interrupting the...