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.
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.
In this basic 4 way light circuit the source is at the first switch and the hot connects to the common on that switch. Three-wire cable runs between all the switches and the traveler wires are connected between the two 3-ways and the 4-way. Two-wire cable runs from the last switch to the light fixture and the common on that switch connects to the hot terminal on the light.
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.
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