This diagram illustrates another multiple light circuit controlled by 3 way switches. Here the source and the fixtures come before the switches. As with the other diagrams on this page, more lights can be added by duplicating the arrangement between the fixtures.
When the electrical source originates at a light fixture and it’s controlled from a remote location, a switch loop is used. The circuit pictured here is wired with 2-conductor cable running from the light to the switch location. The white cable wire in this switch loop is wrapped with black tape and connected to the bottom terminal on SW1 and the hot source at the light. The black wire is connected to the top terminal on SW1 and the hot terminal on the light fixture. The neutral from the source is connected directly to the neutral terminal on the light.
In this arrangement two 3-way dimmers are used to allow for lowering the lights from both locations. Here the common on the first dimmer connects to the hot source and the common on the second connects to the hot on the light. As with all these types of circuits the traveler wires run between the switches and connect the traveler terminals.
This wiring diagram is used for 50 and 60 amp circuits. The receptacle should be wired to a dedicated 50 or 60 amp circuit breaker using 6 awg cable. The 50 amp circuit is required for new installations of some large appliances requiring 240 volts. Two wires carrying 120 volts each can be combined to provide high voltage to heating circuits and one of the 120 volt wires can serve lights or other low voltage circuits in the appliance.
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