.

Then, what is AC wire on thermostat?

The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. It's normally used to provide a return path to power the thermostat. The “c” stands for common. It is often labeled as “c” on thermostat backplates.

One may also ask, which wire is suitable for 1.5 ton AC? In the US, the National Electrical Code would allow a circuit fed by a 15 amp breaker or fuse to use 2.5 mm^2 / 14 AWG wire; that wire can handle that load. If the standards are similar in your location, your 2.5mm wire is fine for a 15A circuit.

Furthermore, which wire is used in AC?

AC Wire Type Choices The most accepted method from the JBOX to the combiner or disconnect switch is 12AWG THHN (Stranded 12 gauge) copper in conduit. You can't really go wrong with that. Some municipalities will allow single strands of hard 12 awg copper to be used but it's harder to pull through conduit.

Is RC same as C wire?

RC and RH. If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. Effectively there isn't a second RH wire, although there is an RH terminal.