With the basics cleared, I hope you yourself can figure out how a 3 way switching system works. You can replace the 2 way switches in the above diagram with relays, and then control the relay using an output from a microcontroller. This is what a relay's diagram looks like, and if you did notice, this is exactly what a 2 way switch looks like but with an addition of a coil which is used to control the output of the relay. As the purpose of this 3-way switching wiring is that to control the light bulb from two different places. As it is three way switching wiring connection, we have used two switches one is ordinary 3-way switch and the second one is 3-way pilot light switch. This is the basic working model of a 2 way switch, for electronically controlling this we can use a SPDT relay. This wiring diagram shows that how to wire a 3-Way pilot light switch as given below. These control a light from two or three switch locations, such as at the top and bottom of a stairwell, at either end of a hallway, or in a large room with multiple entrances. A three-way switch has three terminals a four-way has four. Imagine if you toggle switch1, it now connects to output 2 which is connected to neutral, this closes the circuit, effectively turning the bulb on, now flipping the switch 2 connects the output 2 which opens the circuit and this now switches the bulb off. The most common household switch, a single-pole, has two terminals and simply turns power on or off. In the above diagram the switch1 is connected to output 1 and switch2 is connected to output 1 then its an open circuit and the bulb will be in off state. How a SPDT switch works is - it has a main pole that can be connected to two different outputs. The 14 stands for the gauge of wire (rated for 15-amp circuits). The two way light switch wiring can be implemented by using 2. A three-way switch, on the other hand, has three terminals and is used for. Two different types of wire cables are used in wiring a standard 3-way switch, most often 14/2 cable and 14/3 cable. Each has a common terminal (COM) with a pole that can be switched between position L1 or L2. A single-pole switch only has two terminals and is used for controlling a single light from one location. If you look closely these two switches are SPDT switches (Single Pole Double Throw), When installing a two-way light switch, its important to note that there are two different types of wiring diagrams: a single-pole switch and a three-way switch. We see a normal 1-way switch wiring in our houses or our offices. In simple light switch wiring, we don’t need any special technique and all lights are connected through a separate one way switch with a parallel of supply. Normally in general light switch wiring, we use normal 1 way switch wiring. Let's name the first switch as switch1 and second as switch. The purpose of a 2 way switch is so that you can have a switch by your entry-way and another by, say, your bed so you can operate the same set of lights from. Light switch wiring Two way switch wiring. Image source: Circuit Digest - 2-Way Light Switch The diagram below shows how a 2 way switch wiring works.
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