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Light switch short when switched up and is on when down. 2 black 1 red wire : r/electricians
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When wiring a three way light switch, load or line wite - Connected Things - SmartThings Community
Installing HS200 for a single pole light switch with 3 black wires - TP-Link Community
electrical - Changing old light switch 2 black wires and 1 red - Home Improvement Stack Exchange
3-Way Switch Wiring: A Step-by-Step Guide - Bob Vila
What's the purpose of this looped black wire on my single pole switch? Trying to install a in wall timer switch that requires 3 wires : r/askanelectrician
Identifying Wires on Your Old Switch – Brilliant Support
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