Three-way and four-way switches[ edit ] A double pole, double throw switch wired to act as a four-way intermediate or crossover switch This article follows American usage. The controlled load is often a lamp, but multiway switching is used to control other electrical loads, such as an electrical outlet, fans, pumps, heaters or other appliances. The electrical load may be permanently hard-wired, or plugged into a switched receptacle. Three-way and four-way switches make it possible to control a light from multiple locations, such as the top and bottom of a stairway, either end of a long hallway, or multiple doorways into a large room. These switches appear externally similar to single pole, single throw SPST switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other.
How to replace your old, outdated 3-way light switches
How to Install a Double Switch Light | morriscomedy.com
Access the wiring Now it's time to get at your wiring. There is often a pair of screws holding each faceplate in place, at the top and bottom. Unscrew these screws then remove the plates covering each switch. A common practice is to wrap switch terminals with electrical tape once their wires are connected.
Typically, the source is a circuit breaker in the main electrical panel that has a rating large enough to handle the lights. It's possible to mount the switches in the same or in different electrical boxes, but the latter case involves the extra task of running a circuit cable between the boxes. You maintain the continuity of the hot wire in the circuit cable by forming pigtails at the points where it connects to the switches. Install appropriate electrical boxes for the lights and switches.
How to Wire a Light Switch Wiring your light switches sounds like a headache for another person a professional electrician, to be more specific , but it can become a simple task when some groundwork is laid out for you, as what I am going to do for this article. Just a bit of backstory on why I put this article together: The wiring got damaged and I had to replace them to get the light working again.