Circuit Diagram For 3 Way Switch. Black for live or hot wire. More common in domestic properties.
The circuit consists of a two way switch at each end top and bottom switches in fig 2 and an intermediate switch in the middle. More common in domestic properties. Three wires between the two end switches probably using 3 core and earth cable.
3 way switch wiring diagram line to light fixture in another configuration the power supply enters the fixture first goes into one switch and finally terminates at the other switch closing the circuit.
This 3 way light switch diagram shows connections when the power comes into the first switch on to the second switch and then on to two or more lights switched by the 3 way circuit. Here the source and the fixtures come before the switches. This is also known as the conversion method since it is the easiest way to add a second light switch to an existing circuit. Usually the third wire passes the middle intermediate switch but is joined in a separate terminal block.