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.
In this updated diagram 3-wire cable runs between the receptacle and SW2 to allow for splicing the neutral source through to the second switch box. Here the white is not used for hot but instead the extra, red wire serves that purpose for the second switch.
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.
In a kitchen where only one outlet box is available and both a switch for a garbage disposal and a gfci receptacle are needed, a a switch/gfci combo can be used as in the diagram at this link.
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