Common Wire

Common Wire. Wiring is subject to safety standards for design and installation. Unlike the other wires connected to your thermostat it doesn't control heating or cooling functions.

The C, or "common" wire can make -- or break -- your thermostat installation. The circuit wirings in this article show the most common wiring variations for typical electrical devices. Many conventional, non-connected thermostats don't need a "c-wire" to function.

Confused as to which type and size of wire you need to use in your home wiring project?

If you get an open loop (O.

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Common Types of Electrical Wire Used in Homes

Many conventional, non-connected thermostats don't need a "c-wire" to function. This article discusses the types and uses of common wire and cable used in most homes what you will need to. The term "common" can have two different meanings when it comes to electrical wiring.