A rheostat, or dimmer, makes it possible to vary the current flowing to a light fixture thereby varying the intensity of the light. The dimmer switch will have stranded wires that must be sliced to the solid cable wiring with a pigtail. A device like this should only be used with an incandescent light fixture and not with a ceiling fan or other motor. See wiring a speed controller for wiring a rheostat to control fan speed.
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.
The source in this circuit is at the first switch and the light fixture is located between SW1 and SW2. Three-wire cable runs between each switch and the light fixture. The hot source wire is connected to the common terminal on SW1. The common terminal on SW2 is connected to the hot terminal on the light. The traveler wires are spliced at the fixture box to run between the traveler terminals on the switches.
The two 4-ways are located between the two 3-ways and the traveler wires run from SW1 to T1 on the first 4-way. T2 from that switch is wired to T1 on the second 4way and the output from there to the traveler terminals on SW2.
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