Basic Electrical Wiring 3 Way Switch Diagrams. By looking at the moving 3 way switch above the hot black wire coming from the power source will always attach to the common screw on the 1st switch in the circuit. Connect live or a hot wire to the common or black terminal of the first switch.
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. The black line wire connects to the common terminal of the first 3 way switch. This is the most common and the easiest wiring diagram to follow of any of the wiring diagrams for a 3 way switch circuit.
The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut.
The black line wire connects to the common terminal of the first 3 way switch. 3 way switch wiring. With these diagrams below it will take the guess work out of wiring. 3 way switch wiring diagram light fixture between switches another way to wire a three way switch is when supply comes at the switch goes to the fixture and terminates at the other switch.