3 Wire Switch Loop Diagram

Wiring of 3 way light switches is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram. This wiring diagram illustrates adding wiring for a light switch to control an existing wall outlet. This circuit is wired with a 2 wire cable running from the light to the switch location.

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The hot source wire is removed from the receptacle and spliced to the red wire running to the switch.

3 wire switch loop diagram. 3 way switch wiring diagram. The old method of a 2 wire drop is explained along with the current code requirements of using a 3 wire cable. Fixture wiring exits the switch box. The black wire from the switch connects to the hot on the receptacle.

Pick the diagram that is most like the scenario you are in and see if you can wire your switch. To make a switch loop connect the incoming hot black wire to the white neutral wire that runs to the switch. The black wire power out wiring attaches to the other switch screw terminal. With these diagrams below it will take the guess work out of wiring.

Mark the white wire at each end with black tape or black paint to indicate it is hot. A white wire signifies a neutral wire. 3 way switch wire diagram power to light switch in this diagram the incoming hot wire attaches to the first switch s common dark colored terminal. The fixture s hot wire connects.

The idea of a switch loop is that we take our incoming hot in the ceiling and tie it together with the white wire that goes down to the switch. Next the incoming white neutral wire is attached to the light fixture as usual and the black wire from the switch is connected to the light fixture. From a physical wiring standpoint it will be necessary at a minimum to run 14 3 cable which contains a black red and white wire. This shows wiring a light switch when the power comes into the light outlet first.

Take a closer look at a 3 way switch wiring diagram. The source is at the outlet and a switch loop is added to a new switch. 3 wire switch loop diagram. Switch loops wiring a switch loop.

Wiring a switch loop. The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch. With these diagrams below it will take the guess work out of wiring. The 2011 nec code requires that the switch loop use wires of the proper color code to signify hot wires.

This might seem intimidating but it does not have to be. Wire a 3 way switch duration. The white neutral wires splice together. The ground wires splice together and bond to the switch and the box.

Interested in a 4 way switch wiring diagram. When the electrical source originates at a light fixture and is controlled from a remote location a switch loop is used. Figure 2 diagram of a switch loop. Switched white wires are shown in a different wiring diagram.