![]() ![]() In between the two switches, the two lines are called travelers. Now you need different kinds of switches called three-way switches probably because they have three contacts. Let say you have two different entrances to a room. The basic circuits of on and off the light is shown in the below figure. ![]() Let start with the basic idea of the light switch in an electric circuit. The US terminology used in this explanation. In the US they refer to a three-way switch and four-way switch. In the UK they refer to two-way switch and cross over switch. The terminologies related to switches are different between the US and the UK. When the switch is in off position then the circuit is said to be open circuit. There are three types of circuits they are open circuit, close circuit, and short circuit. The switch is on when the COM terminal and L 1 terminals are connected and the switch is off when the COM and L 2 terminals are connected. Fig (a) is the two way light switch mechanism, fig (b) is the single gang switch face and fig (c) is the single gang two way light switch. ![]()
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