Light Switch With 3 Black Wires

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Why 3 wires in light switch? - Electrician Talk - Professional

I'm trying to replace a light switch (single pole) with a ge zwave Replacing switch: three black wires??? Why 3 wires in light switch?

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Replacing switch: three black wires??? - DoItYourself.com Community Forums

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Why 3 wires in light switch? - Electrician Talk - Professional

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Light Switch Wiring : 3 Way Light Switch On Stairs Home Improvement