How To Install A Light Switch In An Existing Wall

Remove the cover plate from the existing light switch.

How to install a light switch in an existing wall.

Twist the wire nut onto the three wires to secure them. This project guide will walk you through the process of installing the switch including wiring both the switch and the fan. From the switch new 2 wire cable is run to the new light location. Strip the last one inch of your new black wire and place all three black wires together.

When you need to add an outlet or switch in an existing wall you need to use a special electrical box called an old work box an old work electrical box may be metal or plastic and is specially designed to be installed in an existing wall where it has no support other than the wall itself. Turn the power back on and use a noncontact voltage tester to locate the hot wire. Unscrew the switch cover with a screwdriver remove it and unscrew the switch from the electrical box in the wall. Start the light fixture installation project by turning the power off at the main electrical panel unscrewing the switch and pull it out the switch.

Unscrew the wire nut holding the two white wires together. See the video above for more specific instructions. Wiring a new switch and light from an outlet in this diagram power is taken from an existing wall outlet for a new switch and light fixture. Pull the switch from the box and loosen the terminal screws slipping the circuit.

Adding an electrical box to your existing wall for a switch or outlet is easy when you have the right materials and know a few tricks. Unscrew the wire nut holding the two black wires together on your existing light. Remove the two 6 32 screws securing the switch in the box. Pull the switch out turn it on and test the terminals with a voltage tester.

If the wall is heavily insulated push conduit through the insulation and then feed wires or cable through the conduit.