WesBell Electronics
Thermostat Wire

Unjacketed Thermostat Wire


  • 20 awg fully annealed solid bare copper


  • Premium Grade PVC (Polyvinyl Chloride) Insulation
  • Temperature Range -20°C to +60°C
  • Sunlight Resistant


  • Thermostat Control
  • Heating and AC Installations
  • Touch Plate Systems
  • Burglar Alarm Systems
  • Intercom Systems
  • Door Bells
  • Remote Control Units
  • Signal Systems

Part Number Number of Conductors AWG Stranding O.D.
Thermostat 20/2 2 20 Solid .098"
Thermostat 20/3 3 20 Solid .106"
Thermostat 20/4 4 20 Solid .119"
Thermostat 20/5 5 20 Solid .133"
Thermostat 20/6 6 20 Solid .147"
Thermostat 20/8 8 20 Solid .162"



Unjacketed Thermostat Wire Information

Thermostat Wire

An unjacketed thermostat wire, which is low-voltage and used as an intercom cable, can withstand temperatures of up to 60 degrees Celsius. The basic construction of such a thermostat wire is of 20 AWG annealed solid bare copper as specified by the ASTM B-3. The insulation on the thermostat wire is color-coded, premium-grade polyvinyl chloride (PVC) insulation and such wire can support a temperature range of minus 20 degrees Celsius to 60 degrees Celsius.

Like any other wire, such thermostat wire has various colors depending on the number of conductors on each wire. If a wire has two conductors, the designated colors are white and red. A three-conductor wire comes in white, red, and green. A four-conductor wire comes in white, red, green, and blue. A five-conductor wire comes in white, red, blue, yellow, and green. A six-conductor wire is available in yellow, blue, brown, green, white, and red. Lastly, an eight-conductor wire comes in additional orange and black colors.

Ever wondered where these thermostat wires are used? Such wires are used in touch-plate systems, thermostat control, burglar alarms, heating and air conditioning installations, doorbells, intercoms, remote controls, annunciator systems, low-voltage installations, and signal systems, among other uses.

Wires, including unjacketed thermostat wires, play integral roles in the function of a thermostat. The knowledge of the proper placement of wires is important when a person installs his or her own thermostat. It is important to always heed the manufacturer's instructions. A homeowner must make sure that a replacement thermostat should be compatible with the house's current cooling and heating system. One could deal with a standard forced-air cooling and heating system. The HVAC system in older homes could have been added separately.

In a DIY installation of a thermostat, the homeowner or installer must look at the current installation. Note the terminals and the number of wires connected to the terminals. Finding a suitable replacement is much easier if the installer knows the number of terminals and wires being used.

A four-wire setup is a very basic configuration. Thus, it is likely that thermostats compatible with this setup are widely available. When looking for programmable or digital thermostats, there are more complex configurations than the four-wire setup. At least such models need batteries for power, unless a fifth wire is provided to supply power.

The electrical wiring configuration in a multi-stage system will be highly different. One must seek the help of an electrician or a professional when dealing with the installation of a multi-stage system. A lot of options are available in replacing or installing a thermostat. The first step is to determine the desired functions and features and then searching for a compatible model for the thermostat system. These materials are simply easy to find.

The unjacketed thermostat wire is perhaps the most important type of wire in the thermostat installation system as - because of its thinness - it can be placed within the thermostat assembly without disturbing other components of the device. In part, unjacketed thermostat wires are supplied by Carol Brands, a subsidiary of General Cable.

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