Light Switch Wiring Diagram 2 Way. Wiring a two way switch : This is very useful in a number places, particularly hallways and stairs :
When l1 is on l2 would be off. When l1 is off l2 would be on. Power through switch light is controlled by two three way switches with the light between the switches and the power first going through a switch then to the light and onto the second.
If a tunnel has many lights are connected at a fix distance from each other and any person wants to switch on the light only at that exact.
3 way light switching (new cable colours) 3 way light switch (old cable colours) 3 way light switch using a two wire control; The electrical symbol indicates where power enters the circuit. However, as you have not noted where they were connected to the old switch no one can be certain without knowing where the red, yellow & blue go to. 2 way light switch circuit wiring diagrams.