In this circuit the source hot is at the common on the 3 way switch and 3-wire cable runs from there to the dimmer. The traveler wires run between the 2 switches and 2-wire cable runs from the dimmer to the light. The neutral from the source is spliced at each box to run through to the neutral terminal on the light fixture. The common on the dimmer is connected to the hot terminal on the light fixture.
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.
In this arrangement two 3-way dimmers are used to allow for lowering the lights from both locations. Here the common on the first dimmer connects to the hot source and the common on the second connects to the hot on the light. As with all these types of circuits the traveler wires run between the switches and connect the traveler terminals.
This wiring shows the light fixture and the electrical source between the switches. Three-wire cable runs throughout and the hot source is splice to the common on SW1. The common on SW2 is spliced through to the hot on the light fixture. The travelers from SW1 are spliced at the fixture outlet box to run to the 4 way switch.
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