3 Way Wiring Diagrams For Switches. Pictures Descriptions and Handy Tips from Working over 40 Years as an Electrician. Two wires between each switch.
In this diagram power enters the fixture box. Three way switching 2 wires. I have detailed quite extensively why a two wire control system can be problematic in the article 2 way switch with 2 wire control.
The white wire becomes the energized switch leg as indicated by using black or red electrical tape.
In this diagram power enters the fixture box. 3 way switch not in provided diagrams. 3-way switch wiring diagrams for multiple lights. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut.