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In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location. For example, this allows lighting in a hallway, stairwell, or other large rooms to be controlled from multiple locations. 

The three-way switch is a variation of the standard single-pole switch, which controls a light only from one location. A third type is the four-way switch, which is used in conjunction with two three-way switches to control lighting from more than two locations. This configuration may be used in open-plan homes or in large kitchens or great rooms, where a central bank of lighting fixtures might be controlled from more than two entry points.

Three-Way Switch Screw Terminals

If you examine a three-way switch, you will notice several differences when compared to standard single-pole switches. First, the body of the switch will be thicker and bulkier than that of a single-pole switch. Also, the switch toggle lever on a three-way does not have the ON-OFF markings found on a single-pole switch. This is because the switch may turn the light on or off in either position, depending on the position of the other three-way switch in the pair.

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