One potential problem here is where the two switches are in locations covered by different circuits, you may end up with a live feed on one circuit connected to a neutral on a different circuit. This method is also sometimes seen, although its use is deprecated since live and neutral are connected at two different locations. In the above diagram, the black core of the 3&E has been connected to the COM terminal, and the Brown to L1 and the Grey to L2. Two way switches usually have terminals marked COM, L1 and L2. (in the above example the landing light would be switched off, and the hall light would be on) An implementation that allows both lights to be controlled from both locations could look like this: To achieve two way control the usual single switch is replaced with one of the following circuits:Ī typical application is that of being able to switch the hall and landing lights on and off from both upstairs and downstairs. Some manufacturers (especially Hager) put an additional, insulated terminal in the switch, which can be used for looping through the Neutral. NOTE many single way switches will have a space for the L2 terminal, even though it is not fitted since the same plastic casing is usually used for both types. The double pole switch breaks both wires of the 240VAC at the same time to open the circuit and closes at the same time to make contact and close the circuit.The terminals on a dual gang two way switch A third green wire is connected to the ground screw. 240VAC double pole switches require both 120VAC hot wire, which are usually a black and red wire connected to the switch. In domestic applications these circuits power clothes dryers, electric ranges, electric hot water heaters or air conditioning window units, that are on a dedicated double pole breaker in your load center. This circuit is typically used on a larger load like a motor or an appliance that requires 240VAC.Ī double pole switch is used with a 240VAC electrical supply. Occasionally the circuit may be on a double pole breaker, making the circuit 240VAC. Single pole and 3-way switches are used for low current 120VAC (Volts of Alternating Current) applications. For the third terminal, one switch is connected to the hot supply wire while the other switch is joined to the light. Two of these take traveler wires that go from one switch to the other. They are wired so either switch can work the light, regardless of the setting of the other.Ī 3-way switch is larger than a single pole switch and has three screw terminals for wiring connections, plus a ground. These are used in pairs, with one at each switching location. In some applications however, such as hallways and larger rooms, having a single switch can be inconvenient, so it might be useful to control the light from two locations, and this is the role of the 3-way switch. There's also a ground wire to protect against electrical faults. It's called a single pole switch because there are two wires connected or separated by the switch mechanism. 3-wayĪ single pole switch is used to control the light in a small closet or bathroom. It's important to pick the right type of switch for the application. Switches are used to operate lights, fans, and even large electric motors, but they're not all the same. Server racks, enclosures & airflow management.Safety, security & emergency communications.Process safety, automation, test and measurement.Medium-voltage power distribution & control systems.Low-voltage power distribution & control systems.Industrial controls, drives, automation and sensors.Backup power, UPS, surge & IT power distribution.
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