The common terminals will always be connected to a hot wire, either from the source or on the light fixture. These connections can be reversed if it’s more convenient, as long as one of the 3 way common terminals connects to the hot source and the other one connects to the hot on the load, these circuits will work properly.
This diagram illustrates another multiple light circuit controlled by 3 way switches. Here the source and the fixtures come before the switches. As with the other diagrams on this page, more lights can be added by duplicating the arrangement between the fixtures.
Included is a diagram for a 3 way dimmer and an arrangement to control a receptacle from two locations. For more information about these circuits and troubleshooting tips check below.
At the beginning of the circuit the hot source is connected to the common terminal on SW1. The neutral is spliced to the white cable wire and then spliced to the neutral terminal at L1, along with the white 2-cable wire running to L2 where it connects to the neutral terminal.
Source 1 comes in at the light fixture and a 3-wire cable is run from there to the switch half on the device. The hot from the source is spliced to the black wire and to the input side of the switch at the other end. The white neutral from the source is connected directly to the light fixture. The red wire from the switch output goes to the hot terminal on the light.
The traveler terminals will always be connected from switch to switch. Travelers never connect to a device load or to a source wire. It doesn’t matter which traveler terminal is used for which traveler wire, reversing them should make no difference.
This drawing shows the wiring for multiple lights in a 4 way circuit with the source and fixtures coming before the switches. More lights can be added to this circuit by duplicating the wiring shown here for each additional fixture. Here 3-wire cable runs between L1 and L2, 2-wire cable runs from the last fixture to SW1, and 3-wires runs between SW1 and SW2.
Here the source is at SW1 and the light fixture comes immediately after. The source neutral is spliced through to the light fixture. At the light the travelers are splice together and run to the 4-way switch. At the 4-way, the hot wire from the common terminal on SW2 is splice through to the hot on the light fixture.
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