A 30 amp circuit was once the norm for large, high voltage appliances like kitchen ranges. This type of receptacle provides 240 volts and 30 amps of current. The smallest cable allowed for used with a 30-amp circuit is 10 gauge, but 8 gauge may also be found. A 3-conductor cable is needed to carry a total of 240 volts and a neutral return. The circuit is wired to a dedicated 30 amp circuit breaker.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
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.
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.
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