3 3 Way Switch Diagram. Don't forget the Wire, Solder, Shielding & Supplies. Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway.
One of the most common problems is improper wiring due to. The white wire of the cable wiring is marked with black electrical tape, and is going to the switch. Three way switches each have three connections and are used in tandem.
Line voltage enters the light fixture outlet box.
This allows a light to be turned on and off from two locations.
Before you begin anything with a three-way, you must understand that in order for you to have a three-way circuit you must have three-way switches. They are always installed in pairs and use special wiring connections. The white wire of the cable wiring is marked with black electrical tape, and is going to the switch.