Southwire 553040407 18 Awg 4 Conductor Thermostat Cable

Product Description

The SOUTHWIRE 553040407 is an 18 AWG, 4-conductor thermostat cable designed for low-voltage control wiring in residential and light commercial HVAC systems. The cable features a PVC jacket rated for sunlight resistance, making it suitable for both interior runs and exposed outdoor routing where UV degradation is a concern. The overall diameter measures 0.154 inches, and the conductors are color-coded in brown and white for straightforward identification during installation. HVAC technicians and electricians use this cable to connect thermostats, zone controllers, and control boards to air handlers, furnaces, heat pumps, and similar low-voltage equipment.

This thermostat cable is commonly installed in residential split systems, packaged units, and zoned HVAC applications requiring a 4-conductor low-voltage run. Typical uses include thermostat-to-air-handler wiring, zone valve control, and damper actuator circuits. The cable is sold from a 1000-foot coil with a 250-foot minimum cut length, making it practical for larger installations or multi-zone jobs where running a single coil through multiple zones saves time on the rough-in.

Key Features

• 18 AWG conductors sized for standard low-voltage HVAC control wiring
• 4-conductor configuration supports multi-function thermostat wiring including heating, cooling, fan, and common
• Sunlight-resistant PVC jacket rated for exposed and semi-exposed routing
• 0.154-inch overall diameter fits standard low-voltage staples and cable guides
• Brown and white color coding aids conductor identification during termination
• Available in 1000-foot coil with 250-foot minimum cut increment

Compatibility

Designed as a standard 18 AWG 4-conductor low-voltage thermostat cable suitable for use with residential and light commercial HVAC control systems that accept Class 2 low-voltage wiring.

Installation Notes

Installation should be performed by a licensed HVAC technician or electrician in accordance with NEC Article 725 Class 2 wiring requirements. Always de-energize the HVAC system at the disconnect or breaker before terminating or splicing control wiring. Avoid bundling this cable with line-voltage conductors in the same conduit or raceway. Secure the cable at appropriate intervals using low-voltage staples or cable ties rated for the install environment.