Southwire 553100407 18/10 Thermostat Wire 250 Ft Brown CL2

Product Description

The SOUTHWIRE 553100407 is an 18 AWG, 10-conductor solid copper thermostat wire rated CL2 for residential and commercial low-voltage control applications. Supplied in a 250-foot length, this wire connects thermostats, zone controllers, and HVAC control boards to heating and cooling equipment. The solid copper conductors provide reliable signal continuity across typical thermostat wire runs. The brown jacket is UV-resistant and rated for both indoor and outdoor installation, making it suitable for exposed runs, conduit, or direct burial where code permits. Maximum voltage rating is 150 volts, keeping it within standard low-voltage control circuit requirements.

This wire is used in residential and light commercial HVAC systems wherever multi-conductor low-voltage control wiring is required. Common applications include thermostat hookup, zone valve control, humidifier wiring, and damper actuator connections. With 10 conductors, it supports complex zoning systems, communicating thermostats, and multi-stage equipment with auxiliary and emergency heat terminals. It is suitable for new construction and retrofit installations in heating, air conditioning, and ventilation control circuits.

Key Features

• 18 AWG solid copper conductors for consistent low-voltage signal transmission
• 10 conductors support multi-stage and zoning control wiring layouts
• CL2 rated for in-wall and concealed wiring per NEC Class 2 requirements
• Sunlight-resistant brown jacket approved for indoor and outdoor use
• Rated from -20 degrees C up to 60 degrees C for a wide temperature range
• 150-volt maximum rating suitable for standard thermostat control circuits
• 250-foot spool length reduces the need for mid-run splices on longer pulls

Compatibility

Designed as a standard 18 AWG 10-conductor CL2 thermostat wire for use with residential and commercial heating, air conditioning, and ventilation control systems requiring multi-conductor low-voltage wiring.

Installation Notes

Installation should be performed by a licensed HVAC technician or electrician in accordance with NEC Class 2 low-voltage wiring requirements and local codes. Power down all control circuits at the air handler, furnace, or control panel before making any wire connections. Avoid routing thermostat wire in the same conduit as line-voltage wiring, as this can introduce interference into control circuits. Secure and protect outdoor runs from physical damage per applicable code.

Technical Specifications

• Wire Gauge: 18 AWG
• Number of Conductors: 10
• Conductor Type: Solid Copper
• Wire Class: CL2
• Maximum Voltage: 150 volts
• Temperature Range: -20 degrees C to 60 degrees C
• Length: 250 feet
• Jacket Color: Brown
• Sunlight Resistant: Yes
• Indoor/Outdoor Rated: Yes

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 553100407