Thermostat Wire

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WesBell Thermostat wire is designed with solid bare copper strands inside of PVC insulation and a PVC jacket. It's commonly used to wire thermostat control systems and other heating and air conditioning installations. It comes in 20 AWG and 18 AWG anywhere from 2 conductors to 8 conductors. Thermostat wire has a white outer jacket and it's rated for 150 volts and 105°C.

Thermostat Wire Construction

Thermostat wire start with stranded bare copper, covered with a coating of tin for easier soldering in assembly work. The tinned copper strands are covered with PVC insulation (UL approved), and each conductor is color coded with anywhere from 2 to 50+ total conductors per cable. The outer jacket is a grade of PVC and rated for 150 volts and 105°C.

Thermostat Wire Approvals

WesBell’s thermostat cables use UL and RoHS approved conductors. UL provides different tests and approvals based on each UL style, of which UL is 150 volts and 105°C. If you need more voltage or a higher temperature rating you should ask our sales staff to quote it for you. There will be a different UL style to match the different voltage level, such as UL1015 is approved for 600 volts. This unshielded cable is one of the most basic in the industry, which means it’s the cheapest as well. It’s not designed in a cheap way, it just doesn’t have added bells and whistles that some applications require at an added cost.

Thermostat Wire Applications

Generally, thermostat cables are used in applications that do not require the cable to block EMI (Electrical Magnetic Interference), such as Thermostat control, heating and air conditioning installations, touch plate systems, burglar alarms, intercom systems, door bells, annunciator and bell systems, remote control units, signal systems and other low voltage installations. The same installations and applications might also need to block EMI depending on the other cables located in the general area, but the installer or electrician should have that information.

Thermostat cables are basic and can also be considered a group of “hook up wires” in a neat and organized fashion. Instead of installing 8 individual wires that look messy, you can use a PVC cable to create a much neater installation of wires. Some wire harnesses use heat shrink tubing or zip ties to hold the wires together in an organized format. When 2 or 3 wires are being used some customers request them to be twisted together in order to hold their form as a unified wire, or to block EMI when more conductors are running close by.

Thermostat Wire Manufacturers

Several manufacturers make hook up wire and unshielded cables. Both the conductors and jacket and made with PVC (Polyvinyl Chloride) so it’s easy for the manufacturers to make both hook up wire and PVC cables. General Cable, Quabbin Wire, Comtran and Cable Technology are a few manufacturers that WesBell uses as approved vendors. Each manufacturer designs their cables slightly different, so if you have a tight outer diameter tolerance, you should request the cable’s data sheet of the exact manufacturer that you plan to buy.

Thermostat Wire Services

WesBell is an ISO 9001 certified company that will also cut your cable to length, remove the outer jacket to a specified length, strip the insulation from each conductor to a specified length and dip each conductor (copper) into tin. Dipping the conductors into tin will avoid the individual strands from fraying during transit and also increase the connection process when the user solders each wire to their application. Furthermore, WesBell can crimp terminals (Molex, AMP, JST, etc.) to the ends of each conductors and insert them into a plastic house. We provide all of the added services needed, we supply the tooling and applicators, and we hold a release (package size) on the shelf for immediate shipment, when requested.



  • Construction
  • Solid bare copper
  • PVC insulation
  • White PVC jacket
  • Approvals
  • RoHS Compliant
  • UL
  • 105°C
  • 150 volts
  • Applications
  • Thermostat control
  • Heating and air conditioning installations
  • Touch plate systems
  • Burglar alarms
  • Intercom systems
  • Door bells
  • Annunciator and bell systems
  • Remote control units
  • Signal systems
  • Other low voltage installations