So what you should see if you have correct 3 wire electrical cable romex is a black power white neutral and now a 3rd red wire. Connecting a two wire light fixture to a three wire power supply cable is not an ordinary occurrence.
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Light switch with 3 wires. A 3 way wall switch controls a common light or set of lights from two separate switch locations. Its likely youll also need to replace the. Theres no three way set up and this isnt a switch loop either. This guide highlights the procedures for replacing a broken 3 way electrical switch. Before proceeding make sure you are comfortable working with electrical wires and switches. The switch in question is a single pole.
Its likely youll also need to replace the. From it there is 3 wire cable that leads to a light which then connects to other lights controlled by their own switches. Three wire supply cables generally carry red and black hot wires of 110 to 120 volts each with a single white neutral wire. If you have a 2 gang or 3 gang switch you may have black and grey wires however these will have a brown sleeve on them as they are also switched live wires. 3 wire lighting systems the 3 wire system is less common than the 2 wire system it includes a neutral at the switch as well as the live and switched live wires. Either way complete these five steps for 3 way light switch wiring.
A three way wall switch is a common type of light switch that makes it possible to control a ceiling light or other electrical fixture from two different locations in a room. Regardless of what 3 way switch wiring diagram youre following youll need to use a 3 wire cable to connect the two 3 way light switches. The lighting could be added to the three wire cable provided that the circuit breaker is no more than 15 amps and the wire size is no greater than 14 gauge. The red and black are used for hot and the white neutral wire at the switch box allows for powering a timer remote control or other programmable switch. This third wire is necessary for 3 way switch installations. Leave 810 inches 203254 cm of wire inside each of the boxes before cutting the cable to facilitate easy splicing and connection to the switch and fixture.
A 3 wire cable has an extra wire when compared to 2 wire cables and this wire is nearly always covered in red insulation. Plus the two black wires are using the same terminal. Turn off the correct circuit at your electrical panel. In a hallway or large room for example installing three way switches at both ends lets you turn the light fixture on or off from both locations. Add an electrical box for the second 3 way switch in the basement. Two 3 way switches are required in any 3 way application.
Because the electrical code as of the 2011 nec update requires a neutral wire in most new switch boxes a 3 wire cable runs between the light and switch.
Gallery of Light Switch With 3 Wires
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