250' Thermostat Wire, UL 18/8

The Southwire 553080407 Thermostat Wire provides reliable signal transmission for low-voltage heating, cooling, and control systems.

Engineered for indoor residential and commercial applications, this 18-gauge, 8-conductor solid copper wire delivers consistent electrical performance and durability. Its CL2-rated PVC jacket ensures fire safety compliance and protection against moisture, abrasion, and sunlight exposure in non-plenum environments.

• Model number 553080407 identifies the Southwire Thermostat Wire featuring 18 AWG, 8-conductor solid copper design, CL2-rated insulation, and a 250-foot length reel.
• Designed for low-voltage control circuits including HVAC thermostats, heating controls, air conditioning systems, and security applications.
• Flexible PVC outer jacket provides durability and easy handling during installation.

Technical Data & Performance

• Wire Type: Thermostat Wire.
• Conductor Size: 18 AWG.
• Conductor Type: Solid Bare Copper.
• Number of Conductors: 8 individually color-coded conductors for easy identification.
• Insulation Type: PVC (Polyvinyl Chloride) insulation for durability and resistance to abrasion and moisture.
• Jacket Type: CL2-rated PVC outer jacket (non-plenum rated) suitable for general-purpose indoor wiring.
• Jacket Color: Brown – commonly used for thermostat and control wiring identification.
• Voltage Rating: 150 Volts maximum.
• Temperature Rating: Up to 60°C (140°F).
• Length: 250 feet per reel for convenient installation in medium to large projects.
• Applications: Designed for thermostat connections, HVAC controls, doorbells, and alarm systems.
• Compliance: Meets or exceeds UL Standard 13 for CL2 low-voltage communication and control cable.
• Installation: Indoor, dry location use; not rated for plenum or direct burial applications.
• Packaging: Supplied on reel for easy dispensing and storage.
• Warranty: Covered by Southwire’s Limited Manufacturer’s Warranty ensuring product quality and reliability.