Southwire/coleman Cable 55303-05-07 Thermostat Wire 18/3 500ft

Product Description

The SOUTHWIRE/COLEMAN CABLE 55303-05-07 is an 18 AWG, 3-conductor thermostat wire supplied on a 500-foot spool. It features a brown vinyl jacket over solid copper conductors and is rated for a maximum of 30 volts. This wire is designed for low-voltage control wiring applications including HVAC thermostat circuits, bell systems, and intercom installations. HVAC technicians, electricians, and low-voltage installers use this wire for connecting thermostats to furnaces, air handlers, heat pumps, and similar residential or light commercial control systems.

This wire is suited for residential and light commercial low-voltage applications where a jacketed, multi-conductor cable is required. Common uses include thermostat wiring between the control board and the thermostat, bell wiring, and intercom circuits. The brown vinyl jacket helps with visual identification in conduit or through walls. The solid conductor construction is standard for low-voltage thermostat and bell intercom runs where flexibility demands are minimal and reliable point-to-point connections are the priority.

Key Features

• 18 AWG solid copper conductors rated for low-voltage thermostat and bell intercom circuits
• 3-conductor configuration covers common, heating, and cooling control signals in standard thermostat wiring
• Brown vinyl jacket provides durable insulation and easy in-field identification
• 30-volt maximum rating appropriate for Class 2 low-voltage control wiring
• 500-foot spool format reduces waste and suits full-system runs or multiple shorter pulls
• Jacketed construction protects conductors during installation through walls, conduit, or plenum spaces

Compatibility

Designed as an OEM-style low-voltage control wire suitable for residential and light commercial HVAC thermostat circuits, bell systems, and intercom wiring up to 30 volts maximum.

Installation Notes

Low-voltage thermostat wire of this type is typically installed by licensed HVAC technicians or low-voltage electricians in accordance with NEC Article 725 Class 2 wiring requirements. Always power down the HVAC system or bell/intercom circuit at the breaker or transformer before making or breaking connections. Avoid running low-voltage wire in the same conduit as line-voltage wiring without appropriate separation per applicable code. Solid conductors should be terminated with screw terminals rather than push-in connectors to ensure a secure, long-term connection.