Honeywell 84203 Thermostat Wire 18 Awg 4 Conductor 250 Ft

Product Description

The HONEYWELL 84203 is an 18 AWG, 4-conductor thermostat wire cable rated CL2 and supplied on a 250-foot spool. It features bare copper conductors with PVC insulation and a PVC outer jacket, making it a standard choice for low-voltage control wiring in residential and light commercial HVAC systems. The cable is UL and ETL listed, meeting the CL2 classification required for in-wall thermostat wiring runs. HVAC technicians and installers use this wire to connect thermostats, zone controllers, and control boards to heating and cooling equipment. The 250-foot spool provides enough length for multiple residential jobs or a single larger commercial run.

This cable is suited for low-voltage thermostat and control circuit installations in forced-air furnaces, air handlers, heat pumps, and zone control systems. The 4-conductor configuration supports common heating and cooling wiring configurations, including systems that require separate heating, cooling, fan, and common wire runs. It is appropriate for both new construction and retrofit applications where in-wall or exposed conduit routing is used. The temperature rating of -20 to 60 degrees F covers standard installation environments in unconditioned spaces such as attics and crawlspaces.

Key Features

• 18 AWG bare copper conductors for reliable low-voltage signal transmission
• 4-conductor configuration supports standard HVAC control wiring layouts
• CL2-rated for in-wall low-voltage wiring installations per NEC requirements
• UL and ETL listed for compliance with common inspection requirements
• PVC insulation and PVC jacket resist moisture and physical abrasion
• 250-foot spool packaging reduces waste and simplifies job-site handling

Compatibility

Designed as a standard CL2-rated low-voltage control cable for use with residential and light commercial thermostats, zone controllers, and HVAC control boards that accept 18 AWG thermostat wire.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified electrician in accordance with NEC Article 725 for Class 2 low-voltage wiring. Power down the HVAC system at the disconnect or breaker before making any wire connections. Avoid routing thermostat wire in the same conduit as line-voltage wiring, as interference can affect control signal integrity. Secure the cable at appropriate intervals and protect it from physical damage in exposed locations.

Technical Specifications

• Conductor Material: Bare Copper
• Conductor Size: 18 AWG
• Number of Conductors: 4
• Cable Length: 250 feet
• Insulation Material: PVC
• Jacket Material: PVC
• Temperature Rating: -20 to 60 degrees F
• Cable Type: CL2
• Package Type: Spool
• Weight: 27 pounds
• Certifications: UL, ETL

Standard Information

• Brand: HONEYWELL
• Manufacturer Part Number: 84203