Syston 18/3 Thermostat Doorbell HVAC Heating Control Cable Wire, 18 AWG 3 Conduc
SYSTON CABLE TECHNOLOGY THERMOSTAT WIRE. Can this cable be used as a doorbell wire?. Size: 18 AWG Conductor: Solid Bare Copper. This cable can be used in both damp or dry locations. Common thermostat wire colors include Red for power, White for heat, Yellow for cooling, Green for fan, and Blue for the C-wire.