Be sure to match the switch box height to those in the rest of your home. Cut openings into the ceiling or wall surfaces for the boxes for the switch es and for the fixture support by first tracing around the box on the wall or ceiling surface.

Wiring A Switched Wall Light 1 Wiring Diagram Source
How to install light switch box. Figure 3 old work electrical box. Connect the black wire to the brass screw and the neutral wire to the silver screw. Remove mounting screws and gently extract the switch from the wall box. Run a 142 ground cable from the switch box to the electrical box where the light fixture is located. Turn off the power. Installing an old work electrical box.
To make this happen connect the black circuit wire to the brass screw on the device the white wire to the chrome screw and the ground wire to the green ground screw. Prepare the wires for connecting to the. Route them along the back of the box to a central location cut them to length and use wire strippers to expose about 34 in. Twist the conductors with pliers trim the bundle and cap it with a wire nut. In the first case the switch controls the outlet and nothing else. Connect the neutral white wires with a wire connector.
Loop the black wires clockwise around the screws and tighten the screws. Wrap a little more than 12 inch of the stripped wire clockwise around the terminal screws and tighten with a screwdriver. Installing a combination switch outlet you can wire a switchoutlet combo in one of three ways. If a fixture is to be installed in the ceiling the box should be a 4 octagon box. Remove and inspect the switch and wires. Use the voltage tester to verify the power is safely shut off.
Strip the ends of the wires at the switch box. Put a note on. Of copper conductor on each wire. Connect the ground wire to the green screw on the opposite side of the switch. Connect the ground wires with a 6 in long pigtail wire leading to the switch. Remove the wall plate.
Included in the tutorial are tips for making the box installation go much smoother and faster so you will be up and running quicker. All of the connections in the switch box can be made prior to turning any power off. In the tutorial how to install an electrical box in an existing wall we provide detailed photo rich how to instructions on easily installing the old work electrical box. White neutral wires often are connected together in a switch box.