Here the source is at the receptacle and 2-conductor cable runs from there to SW1. The hot source is spliced to a pigtail that connect to the bottom, always-hot, half on the receptacle and to the white cable wire which continues on to the bottom terminal on SW1. The black cable wire is connected to the top terminal on the split receptacle and runs to the top terminal on SW1. The circuit neutral wire is connected to one of the neutral terminals on the receptacle, it doesn’t run to the switch.
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 diagram shows the first wiring option for this device. In this arrangement the connecting tab between the hot terminals remains intact. The source is at the device and the hot is connected directly to one of the hot terminals, it doesn’t matter which one.
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.
This represents a change in the NEC code that requires a neutral wire in most new switch boxes. If you are running a new circuit check the electrical code to understand this and any other updates to the required procedure.
This diagram is the same as the one above but the dimmer comes first in the circuit. This arrangement is provided for easy reference when dealing with a circuit wired like this.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
The wiring diagrams on this page make use of 4 way switches, between two 3 way switches, to control lights from three or more locations. A 4-way dimmer diagram is included as well as an arrangement to control the lights from four different points. Check here for 4 way switch troubleshooting and help with 3 ways switches here. For circuits that control lights from two locations only, check the wiring diagrams at this link.
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