A 3-wire cable runs from L1 to L2, 2-wire cable runs from there to the first switch, and 3-wire cable runs between SW1 and SW2. The source hot is spliced to the black wire running between the lights and at the last light, it is spliced to the black wire running through to the common on SW1. The white wire is marked black and spliced to the black wire running to the common on SW2.
The following 3 diagrams show the wiring for a specially made dimmer that can be used in these circuits in place of either of the the 3 way switches, or both. This arrangement allows for lowering the lights in a 3 way circuit. After the dimmer level has been set the other switch will turn the lights off and on at that level. This device can be used in place of any of the 3 way switches in these circuits, as well as to dim the lights in a 4 way circuit.
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.
This receptacle can typically be found in living room and bedroom wall outlets. One of these may be controlled with a switch and/or wired to other receptacles in the circuit. For a 15 amp receptacle like this, 14/2 cable with ground should be used to feed the circuit.
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