When it comes to installing a cable specifically engineered to handle the evolving demands and functionality of thermostats, plenum-rated thermostat wire delivers exactly what you need: 

• First cable designed specifically for the power requirements of the circuit

• Ideal for both new (energy-efficient) and existing HVAC equipment

• Available in 2, 3, 4 and 6-conductor constructions

TWP-18/3 is 18 guage solid, three conductor, plenum rated in 500' rolls.

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Documents

Cable Selection Guide

Specs

Capacitance: 20.6 pF/ft. nom.

Conductor Count: 3

Conductors: 20 AWG Solid Bare Copper

DC Resistance : 11.1 Ohms/1000 ft at 20°C

Gauge: 20 AWG

Impedance : 74 Ohms nom.

Materials: N/A

Operating Voltage: 150 Volts max.

Outside Diameter: 0.174 in nom.

Packaging: N/A

Temperature: -20°C to 60°C

Wire Length: N/A