How to Backwire an Electric Outlet

When replacing or installing an electrical outlet, it is essential that you need to know how to connect the wires to the outlet.

There are two methods of connecting the wires: 1.) side wiring; 2.) backwiring. Side wiring is where you connect the wires directly to the side screws by forming a loop in the wire and turning the screw so that it holds the wire firmly in place. Backwiring is where you insert the end of the wire into a slot in back of the outlet.

Books on electrical wiring have varying opinions on side wiring vs. backwiring. Side wiring is considered to be a more solid "fix" and is often the choice of electricians. Backwiring allows you to connect wires faster, but usually does not hold the wires as firmly in place as does side wiring. The reason for this is many outlets have a "spring-loaded" slot that does not provide as solid a hold as do screws.

However, I recommend you look for an outlet that combines the best of both worlds. Some outlets have a backwiring slot that holds the wire in by means of the side screw rather than a spring.

Unscrew Side Screw

First, of course, use a voltage tester to make sure there is no current coming to the receptacle. Using a Phillips screwdriver, unscrew the screw until it is loose--but do not remove it all the way.

Insert Wire in Backwire Slot

Now, go to the back of the outlet and insert the stripped end of the wire into the slot.

Make Sure No Bare Wire is Showing

Make certain that you have nipped off the end of the wire to an exact length. The exact length means that it is not short enough that plastic sheathing goes into the backwire slot and that it is not so long that bare wire is showing. It is very important that no bare wire is showing, as this can contact with other wires and cause an arc that can lead to a fire.