Wiring Up A Light Switch Uk. Connect the wires to the new 3 way switches with ground screws using one of the two wiring diagrams fig. Basic knowledge of how to wire a light switch.
This is not always the case. A one way light switch is quite easy to wire up. The red wire from the feed cable is connected to the top terminal the red wire going to the light is connected to the bottom terminal the black wires from both cables are connected together in a plastic terminal block and the earth wires are connected to the earth terminal.
If you look inside an existing wired in two way switch you will see quite a few wires of differing colours.
The cable that comes from the switch to the light has a black and a red wire both of these are live wires. White black and red plus a bare ground wire. Wiring a one way switch a one way light switch has two terminals which is a common marked as com or c. The most common mistake made when changing a ceiling light is connecting black to black and red to red.
