Wiring Diagram 2 Way Switch

By | April 27, 2022



A Comprehensive Guide to the Diagram for a Two-Way Switch



Homeowners, electricians, or do-it-yourselfers alike may need to understand the details about wiring a two-way switch quickly. When properly wired, light fixtures can be switched on and off from different locations. This article is an easy to follow guide about understanding wiring diagrams of two-way switches and the corresponding electrical circuit.

Popular two-way switch wiring systems are used in homes, apartments, and buildings to provide flexibility with lighting. With wiring diagrams, installation time is much reduced because it’s easier to understand not only the electrical wiring, but also the system’s components as well. To begin working on any two-way switch wiring diagram, it’s important to review the basics.

The Basics of Circuitry for Wiring a Two-Way Switch



When looking at a general two-way switch wiring diagram, three components make up the base circuitry – the switch, the power supply, and the load. With this in mind, it’s easy to familiarize yourself with the color coding often used. Generally, black indicates the switch, red or black denotes hot wire, and white indicates the return wire or neutral.

From the power supply, two black, or in older models red, wires will go to the switch. The white wire from the power supply connects to the switch and then goes to the load. On the load end, a white wire will connect to the switch, and a black wire will connect to the load. Note that when utilizing two-way switches, it’s important that the load has two screws connected by separate returns. This ensures that the load will have continuous power regardless of the position of the switch.

Common Terminology Found in Wiring Diagrams



Various symbols and words are employed by manufacturers with a drawing included in the packaging for a two-way switch system. Viewing the diagram allows homeowners, electricians and other personnel to quickly understand the layout of connections. Below is common terminology found within these diagrams:


  • Line - represents the hot wires connecting the switch back to the power.

  • Load – typically a light fixture showing a connection to the load.

  • Gnd – ground indication showing a connector to ground.

  • Sw – switch symbol indicating the device located on the line and load ends.

  • Supply – voltage source of electricity supplying hot, neutral and ground wires.



Connecting a Two-Way Switch



The steps to connect a two-way switch depend on the type being installed. To inspect the circuit, use a non-contact voltage tester and if necessary replace the switch with one that matches the current wiring colors. Before installing a new switch, disconnect power to the circuit.

Next, unscrew the screws securing the switch and plate to the box. This will expose the current wires, allowing them to be moved to the additional screw terminals. Now, the wires of the existing switch should be connected to the two screw terminals of the new switch. The entire process should take no more than 15 minutes to complete. Once the wiring is connected, the switch plate should be secured onto the box and power should be turned back on.

Connecting a two-way switch is easy, but it’s important that the wiring diagram for the switch be understood before a homeowner attempts to install the device. Doing so will allow for quick and easy installation without risking damaging the switch or electrical system in place. Fortunately, this article serves as a comprehensive guide to wiring a two-way switch, allowing everyone the opportunity to feel confident during installation.


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