Here the source is in the middle of the circuit. The dimmer switch is in this box where the hot is connect to the common wire. The common on SW1 is run to the light fixture hot terminal using the white cable wire to the dimmer box where it is spliced with the black cable wire going to the light. The white wire is wrapped with black tape to mark it as hot. The traveler wires are connected in the same way as the above diagrams. The neutral runs directly from the dimmer box to the light fixture.
Here two switches are wired in the same box to control two separate lights. The source is at the switch box and a 2-conductor cable is run to each light. One source is spliced to each switch with a pigtail to power the two lights.
Here a receptacle is added to the circuit before the first switch. It is not controlled with the switches but is instead always hot. The source hot, neutral and ground are spliced to a 2-wire cable that runs to the new outlet. The 3 way switches and light are then wired in the usual way with the common on SW2 spliced to the source hot and the light hot wired to the common on SW1.
In this diagram the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between SW1 and SW2 are connected to the traveler terminals. The hot source is connected to the common terminal on SW1, and the common terminal on SW2 connects to the hot terminal on the light.
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