electrical - Which one is the common wire on this 3-way switch? - Home Improvement Stack Exchange
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Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :
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What's a C-wire, and why should you care? - CNET
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electrical - Which one is the common wire on this 3-way switch? - Home Improvement Stack Exchange
Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098 - Amazon.com
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Thermostat C-Wire Common Wire Function, Missing, Add-on Options
Thermostat C-Wire: How it Works on Your Thermostat | Honeywell Home