This method is commonly used now days as it is efficient than the two wire control system.
2 way switch.
You have an incoming hot wire black going to one screw it does not matter if you use the brass or silver screw on the side of the 2 way switch and a black wire from the other screw on the 2 way switch going to the load light ceiling fan etc.
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How to wire 2 way light switch in this video we explain how two way switching works to connect a light fitting which is controlled with two light switches.
The three terminals are usually named com l1 and l2 but sometimes com 1 way and 2 way are also used.
How to connect 2 way switch wiring using three wire control.
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In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal.
Before proceeding an important component called a two way light switch is the main element of the 2 way switching irrespective of the type of wiring used.
2 way switch 3 wire.
Notice the black wire is the only wire that we are controlling through the 2 way switch.
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This is the new method to make a 2 way switching connection as it is slightly different from the two wire control method.
The hot from the power source connects to the 2 way switch sw1 where it can be switched to the hot terminal of the light lt1 and spliced through to lt2 via the cable c3.
It is a standard single pole switch with three terminals.