This is very useful in a number places particularly hallways and stairs. Each of the gangs or switches above in fig 2 of which there are three work like this fig 3.
Wiring a two way switch.
You can find out more Diagram below
2 gang 2 way light switch wiring diagram. A two way switch has 3 terminals. 3 way light switch wiring 2 wire system this switch arrangement is basically two two way switches on a single face plate. This type of light switch is used where two switches control the same light such as at the top and bottom of a stairway.
You dont see these as much now days as many manufactures only make 2 gang 2 way light switches that serve the same purpose you just dont use the third l2 terminal on each gang however i thought we would include it just in case you come across one. In position 1 when the switch is down or on com and l1 are connected together just like the one way switchin position 2 when the switch is up or off com and l2 are connected together. Two way switching allows you to control a light from two locations.
Three wire cable is supplying the source for the switches and the black and red wires are each connected to one switch. Some brands of light switch may have slightly different labeling on the terminals such as c l1 l2 or even l1 l2 and l3. You can use it as a one way switch by using the com and l1 terminals only.
A commonc l1 and l2. To switch from two locations youll need 2 two way switches and wire them together in a particular way. Wiring two switches in one box with 2 sources.
This diagram shows two switches in the same box with a separate 120 volt source feeding each.
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