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There are many different kinds of carling switches.
Generally a carling switch has 2 or more screw terminals, consisting of the center-or-middle screw, and the screw-or-screws on end of switch
The middle screw is Common screw > this is where you connect Hot wire from circuit breaker or battery.
The wire going to load (light, fan, motor) connects to screw on end of switch.
In the case where switch has 1 middle screw and 2 screws on end of switch, the Hot connects to middle, and then Load wires connect to each end screw. When the switch is toggled back and forth, one of the end screws receives power, or the other end screw receives power.
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