If the cable is too tight to permit at least six inches from each end to extend into the box, cut the feed from the breaker first. Before cutting the cable, place the electric box in a suitable location and fasten it in place. The 220V line going to the equipment will have to be severed in a spot near the equipment, but where there’s enough slack to wire up an electrical box. Confirm that the power is OFF by trying to turn on the equipment. The first thing to do before starting the installation is to shut off the circuit breaker dedicated to the piece of equipment being worked on, in the main electric panel. This installation illustrated here uses a three-wire cable but it is exactly the same wiring at the switch in two-wire cable installation for the colored wires, except that the neutral (white) wires are to be ignored. Part 1 - Install the Switch Box and Wires The following steps will illustrate how to do the installation. Either way, the double pole switch is the one to be used, since, in each instance, it cuts both of the colored (hot) line OFF and stops the current flow. If a multimeter was put across the two colored (hot) wires however, the reading would be 220 volts, giving this type of wiring an extra option. If the white wire was to be measured across to the red or the black, 110 volts would be measured in each instance. Such a hookup is needed if some of the controls in the appliance or equipment run on 110 volts while the main part generating the action such as the motor or heater, needs 220 volts. The second way is through a three-wire cable where one white neutral wire and two hot wires, one black and the other red, will be used. 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.Each one of them is hot and carrying 220 volts (if tested across both wires). 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.
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