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.
Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be connected to the switches in these circuits, although some smart switches may make use of a neutral wire to operate the device.
The neutral wire provides a return path for the circuit and the ground wire provides extra protection from electrocution not found on older 30 amp, 240 volt appliance hookups.
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