Electrical 3 Way Switch Diagram. The three-way switch is a variation of the standard single-pole switch, which controls a light only from one location. Three-way wall switches control a light fixture from two locations in a room.
Four-way switches are very similar in design to three-ways and are used to control lights or receptacles from three or more switch locations. Here is an excerpt from the videos that Dan have produced concerning the electrical rough-in. I will add my "Rules of Thumb for wiring switches" I use in my class.
Understanding how the circuit works And, my father did electrical work.
They are always installed in pairs and use special wiring connections.
Three-way switch wiring requires the use of a three-conductor cable to connect the two switches. There are several possibilities depending on where the power source enters the circuit. I am currently teaching lessons on Basic electrical circuits.