Here two 3 way switches control a wall receptacle that may be used to control a lamp from two entrances to a room. This circuit is wired the same way as the 3 way lights at this link.
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.
Three-way switches have 3 terminals to carry circuit electricity and one terminal for a ground wire. Of the three circuit terminals, one is called the common and the other two are known as travelers. The common terminal may be labeled and is usually a different color than the traveler terminals. Depending on the manufacturer, the travelers may be on opposite sides of the device or the two terminals may be on the same side. In any case, the common terminal will be distinguished from the travelers in some way.
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