What is the common wire on a thermostat?

A common wire is simply a wire that’s dedicated to delivering constant power to your thermostat. Unlike the other wires connected to your thermostat it doesn’t control heating or cooling functions.Click to see full answer. Thereof, do all WiFi thermostats require C wire?A C-wire or common wire is a power supply that is required for your smart thermostat to work properly. Unfortunately, most of the older thermostat models didn’t require one and that is the reason why many homes do not have a C-wire installed. Almost all WiFi thermostat models require a common wire.Beside above, what is the blue wire on a thermostat? The blue wire, or C-wire, is known as the common wire. It’s there to provide power to the thermostat. Older thermostats usually don’t have a C-wire because they either don’t need power or, if they do, they get it from a battery. Similarly, you may ask, do I have a common wire? It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.”What color is the common wire?The “common” is the “neutral” or “ground” wire, depending on the type of circuit. In normal US residential wiring, you’ll have a black “hot” wire, a white “neutral” or “common” wire, and a green or bare “ground” wire.

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