3 Wire Light Switch Wiring. You can connect any number of switches, but you need the three wires, at least between the light and the switch. (You only need two from the service). Separate the wires so that they are as far away from each other as If one of the black (hot) wires does have power, then that is the wire for the "always on" plug.
Twist the ground wires from both ends together and.
Most smart light switches require a ground wire, an "in" wire, an "out" wire, and a neutral wire.
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Most homes have the in, out Once you've fit the wires in the box, screw the smart light switch into place. Separate the wires so that they are as far away from each other as If one of the black (hot) wires does have power, then that is the wire for the "always on" plug. You should only need to change the wiring in each switch box (light box(es).