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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22508
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I would like to know if I'm using the right thermostat cable

Customer Question

I would like to know if I'm using the right thermostat cable for my installation of a Wi-Fi thermostat?
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


are you referring to the thermostat wire from furnace to the thermostat?

Customer: replied 1 year ago.
I need a common wire so I have (not yet worked on) Honeywell 18 AWG 5c CL2, Should I be using a CL2R?
My current wiring situation is 4C CLR2. I'm going from the basement to the 1st. floor.
Customer: replied 1 year ago.
Customer: replied 1 year ago.
1). I also noticed that the current wiring appears to be a little thicker even though they are both the same gauge? Any thoughts?
2). Also, I checked the voltage and it reads 27.5/28. is this o.k.?
3). Lastly, there already is a wire connected to the C terminal and it runs out to the A/C condenser. Can I still run another wire on that terminal?
Expert:  BillyHvac replied 1 year ago.

as long as wire is 18 gage you are fine.

27.5 is standard and acceptable.

Yes you can use the C terminal where the ac terminates.

If any other concerns please let me know.