To wire this circuit, 2-conductor cable runs from the dimmer to the light. The source is at the dimmer and the hot wire is spliced to one hot wire on the device. The other wire from the dimmer is spliced to the black cable wire which runs on to the hot terminal on the light. The source neutral wire is spliced to the white cable wire which continues on to the neutral terminal on the light.
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.
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.
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.
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.
In this diagram the source is at SW1 and the hot is connected to the common terminal there. Three-wire cable runs between the switches and 2-wire cable runs from the dimmer to the light fixture. The travelers from SW1 run to T1 on the 4 way switch and from T2 to the traveler wires on the dimmer. The dimmer common wire is spliced to the hot terminal on the light.
To wire more than one GFCI receptacle in the same circuit, connect the source to the line terminals on each device using a pigtail splice. The load terminals are not used for this circuit. See more GFCI wiring diagrams at this link.
Check to be sure the traveler wires only connect between the traveler terminals on the switches. Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be used with these switches, although some smart switches may make use of a neutral wire to operate the device.
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