This 3-way switch wiring variation was used as a way to wire 3-way switches and be able to supply line voltage and lighting load to either switch switch box. This configuration is no longer allowed if a neutral is not present in each switch box. This wiring variation is sometimes seen in certain commercial environments.

Conventional 3-way wiring is not very complex. With conventional wiring, the line (line voltage) connects to the common of one switch, while the load (light) connects to the common of the other switch. However this wiring variation could cause confusion.

This 3-way switch wiring variation is described below.

1. The common terminals from each switch is connected together.

2. One traveler from each switch are connected together and to line voltage.

3. The other travelers from each switch are connected together and to the load(s).

It may be difficult to determine which configuration is present in any 3-way wiring configuration. When replacing a switch, the new switch needs to be connected the exact same way as the old one. If you have any problems with your 3-way switches, it may be best to call an electrician.

3-Way Switch Variation Diagrams

3-Way Switch Variation

Line and load connect to the left switch box side

Left switch is toggled, circuit is open.

Right switch is toggled, circuit is closed.

Toggling 3-Way Switch Variation

Left switch is toggled, circuit is open.

Line and load connect to the right switch box side

3-Way Switch Variation Wiring