Light Wiring Diagrams

3 way light switch using a two wire control

I’m including this method for reference in case you find it used in your house wiring but would not recommend this approach in a domestic environment. If you are adding wiring for a three way light switch then use the 3 wire control system.

I have detailed, quite extensively, why a two wire control system can be problematic in the article 2 way switch with 2 wire control. All the issues raised there apply here too, especially if used in stairways and the switches are on different floors.

This method is best suited to conduit/trunking based installations where single core conductors are used.

3 way light switch schematic diagram using a two wire control

3 way light switch schematic diagram using a two wire control


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