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What gauge is C wire for thermostat?
18 gauge
The most common is 18/5 (5 strand, 18 gauge). The 5 strands of wire provide enough functions for the modern thermostat. The most common benefit of having 5 conductors is being equipped with a common wire, known as the c wire.
Does the C wire power the thermostat?
The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). To make it continuous requires a common wire to complete the circuit.
What is a common C wire for thermostat?
The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. It’s a wire that (if you have one) runs all the way from your furnace to your thermostat.
How do I know what wire to get for my thermostat?
Look for connectors that have labels that are the same as your thermostat. For instance, you might find labels like R, W, G, Y, C or O/B. You should find wires attached to these connectors that are the same color as the wires that connect to your thermostat.
Can I use the G wire for the C wire?
Option #3: Use a G-Wire as a C-Wire If there is no hidden C-wire, you can use a G-wire instead. However, you will not be able to use your fan independently when the heating or cooling isn’t running. Also, many HVAC systems are incompatible with this solution, including: HVAC systems using electric heat.
How many wires should my thermostat have?
The most basic thermostat has 2 wires; usually a red and a white wire. Two wire thermostat wiring is used for furnaces only and usually doesn’t need a “C” or “Common” wire. That’s why we only need two wires: Red wire for power (24h).
Where does the blue wire go on a thermostat?
C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Blue wires are for heat pumps, like orange wires. This wire connects to terminal B on your thermostat.
What does a C wire on a thermostat do?
A common wire (C-Wire) provides Wi-Fi thermostats continuous power by connecting it to a heating and cooling system (e.g. furnace). C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round).
How many volts does a thermostat wire need?
The thermostat wire is sized for mechanical durability, not for current carrying capacity. Codes may require the circuit to be Class 2, 30 volts and 100 VA maximum, usually 24 volts and no more than 4 amps. It could be much less than 4 amps and most of the capacity may be required for the relays in the HVAC unit.
Where does the power come from on a smart thermostat?
The power from the R wire isn’t continuous and that is where the C wire comes in. The C wire completes the circuit from the R wire back to the HVAC system’s control board. This is what provides the continuous flow of power which keeps the smart thermostat’s display and Wi-Fi capabilities running 24/7. What Color Is a C-wire?
Can a smart thermostat be used without a C wire?
Smart thermostats like the ecobee SmartThermostat (link to Amazon) and the ecobee3 lite (link to Amazon) come with a Power Extender Kit (PEK) in the package. The PEK allows the smart thermostat to be used without a C wire. The PEK will only work with HVAC systems that have: 4 wires – W/W 1, Y/Y 1, G, and R (or R C or R H)