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 again, the connecting tab between the receptacle terminals is broken off and the neutral tab remains intact. The source is at SW1 and 3-conductor cable runs from there to the receptacle, 2-conductor cable runs from the receptacle to SW2. The source hot wire is spliced to the bottom terminal on SW1 and to the red cable running to the receptacle.
A 4 way switch must be wired between two 3 ways as shown in the diagrams on this page. A 4 way has five connections: one ground, and 4 circuit terminals divided into two matching pairs. Each pair of terminals should be wired to the traveler wires from one of the 3 way switches. The travelers can be wired to either terminal in a pair, but don’t mix up the pairs or the circuit won’t work properly.
Source 1 comes in at the light fixture and a 3-wire cable is run from there to the switch half on the device. The hot from the source is spliced to the black wire and to the input side of the switch at the other end. The white neutral from the source is connected directly to the light fixture. The red wire from the switch output goes to the hot terminal on the light.
If the switch is good and things still don’t work, check the wiring to be sure the hot source is connected to a common terminal and the light fixture hot is connected to a common terminal. Likewise, be sure the traveler terminals are connected between switches only and not to any hot wires or the load.
A 20 amp, 120v duplex receptacle like this should be installed in a circuit using 12 awg or larger cable and a 20 amp circuit breaker. These receptacles are usually found in kitchen wall outlets where two branch circuits are needed to serve small appliances and a refrigerator.
A rheostat, or dimmer, makes it possible to vary the current flowing to a light fixture thereby varying the intensity of the light. The dimmer switch will have stranded wires that must be sliced to the solid cable wiring with a pigtail. A device like this should only be used with an incandescent light fixture and not with a ceiling fan or other motor. See wiring a speed controller for wiring a rheostat to control fan speed.
In this updated diagram 3-conductor cable runs between the receptacle and switch, and the red cable wire is used to carry the hot source to the bottom terminal on the switch. The neutral from the source is passed through to the switch box using the white wire and in this diagram the white wire is capped with a wire nut.
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