Below is the way i like to do it. The way i show allows you to fairly easily add a second two way switch to an existing light switch by simply wiring them together in a certain way.
Two 3 Way Switches One Acting As A Master Switch
2 way light switch wiring diagram old colours. Light wiring diagram. You will see that there is a hot wire that is then spliced through a switch and that then goes to the hot terminal of the light. 3 way light switch old cable colours 3 way light switch using a two wire control. 3 way light switching new cable colours 3 way light switch old cable colours 3 way light switch using a two wire control. The power source comes from the fixture and then connects to the power terminal. A 2 way switch wiring diagram with power feed from the switch light.
A two way switchuk schematic diagram of old wire colours. For simplicity the earth wire is not shown in the above. Schematic diagram of new wire colours. Student training aid for the connections when the feed is taken directly to the switch 2 plate method and also 2 way switching. They are wired so that operation of either. Video explains the connection required within switches.
There is a chance that if your house has these old wiring colours the switch drops may be from a loop in loop out radial lighting circuit done with junction boxes rather than ceiling roses as shown in fig 2. The switch wiring is all the same but the switch. 2 way switch 3 wire system new harmonised cable colours 2 way switching means having two or more switches in different locations to control one lamp. 2 way light switch 3 wire system new harmonised cable colours 2 way switch 3 wire system old cable colours 2 way switch two wire control three way switching.