Southwire 18-2CS Thermostat Wire 18 Awg 2 Conductor

Product Description

The SOUTHWIRE 18-2CS is an 18 AWG, 2-conductor thermostat wire supplied in a 500-foot spool. This low-voltage control wire is used to connect thermostats and control boards to HVAC equipment such as furnaces, air handlers, and heat pumps. The wire provides reliable signal transmission between system components and is well suited for both new installations and service replacement runs. HVAC technicians typically install this wire during new system commissioning or when replacing damaged thermostat wiring in residential and light commercial applications.

This wire is designed for low-voltage thermostat and control wiring in forced-air heating and cooling systems. It is a practical choice for standard 2-wire applications such as single-stage heating-only systems or simple zone control circuits where only two conductors are required. The 500-foot spool provides enough material to complete multiple jobs or a single long run in larger structures.

Key Features

• 18 AWG conductor size suitable for low-voltage thermostat and control circuits
• 2-conductor configuration for basic heating or cooling control wiring
• 500-foot spool minimizes the need for mid-run splices on longer installations
• Designed for low-voltage HVAC control applications in residential and light commercial settings

Compatibility

Designed as a standard replacement or new-installation thermostat wire for residential and light commercial HVAC control wiring applications requiring an 18 AWG 2-conductor cable.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified electrician following applicable local codes and NEC guidelines for low-voltage wiring. Power down the HVAC system at the breaker and disconnect the thermostat before pulling or terminating new wire. Avoid sharp bends or stapling through the insulation jacket, as this can damage conductors and cause intermittent faults. Verify polarity and terminal labeling at both the thermostat and the control board before restoring power.

Technical Specifications

• Conductor Size: 18 AWG
• Number of Conductors: 2
• Wire Length: 500 feet
• Application: Low-voltage thermostat and HVAC control wiring

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 18-2CS