![]() 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.Neutral wires connect to three different points: the light fixture, junction box, and existing switch. This wire is used with advanced electronic dimmers, so be sure to check the manufacturer's directions to determine if the dimmer switch requires a neutral connection. White Wire: Not every home has a neutral wire, but if you home does, then make sure to purchase a dimmer switch that is compatible with neutral wiring.This wire extends from the junction box to the designated terminal on the light switch. In some situation, the ground wire may be bare copper. Green or Copper Wire: The ground wire will generally have a green sheath.The black wire without voltage is the load wire. With the electricity restored to the light switch, use the non-contact voltage tester to check both black wires. If you aren't certain which wire is the line wire, keep the light switch off, but turn the breaker switch back on. ![]() This wire connects to the main electrical box, extending to a terminal on the existing switch. Black Wire: The line wire is always black.This wire extends from one terminal on the existing switch to the light fixture. Black/Red Wire: The load wire is typically black, but in some cases it may be red.Use wire labels to mark the wires currently attached to the switch. ![]() Gently pull the switch out of the junction box without removing the wires. Once you are certain the electricity is off to the switch, use a screwdriver to loosen the mounting screws at the top and bottom of the existing light switch.
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