2015 11 16 174721 2015 11 16 174721. They usually need a common wire or c wire to provide this continuous power.
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What does a common wire do. If you are referring to the neutral wire in a three wire split phase secondary it is. The common wire is a trick that saves wiring and simplifies electrical panel design. 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. Your house wiring works on the same principle just on a larger scale and at higher voltages. When everything is complete the thermostat will have a continuous supply of 24 volt energy. What does the common wire do.
The common wire is usually blue or black but that is not guaranteed. Standard wiring design in us. Knowing the color code is essential for setting up the correct configuration of an electrical system and for safety. A neutral wire is any wire with 0 volts potential to ground hence a neutral potential. Homes involves a neutral wire at the ground potential and two hot wires of 120 volts each. A common wire is either a connecting wire or a type of neutral wiring depending on the electrical circuit.
If one end of each winding is tied together to form one connection point this point is typically referred to as the common connection. The white wire is the common or neutral wire in a 100 volt service but the wire can also be gray in color. If you recall your science classes in school you probably built simple circuits using a battery and a light bulb. Thermostats can get this constant power through a common wire or c wire it is easy to see if you already have a c wire connected to your system. Regarding thermostats one thing you do have direct control over relates to a single wire called the c or common wire. In three phase electricity transformers have three separate windings.
Power flows from the red wire but not continuously so the common wire is necessary to complete the process. Contrary to its name the c wire isnt actually all that. When it works as a connecting wire the wire connects at least two wires of a circuit together. A white or gray wire can only be connected to another white or gray wire.
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