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Thermostat Wire 18AWG Solid Bare Copper CMR Brown – 2 3 4 5 8 Conductors
SKU:
1331-Big
Regular price
$94.99
Unit price
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Solid Bare Copper, 18AWG, 2 to 8 Conductors
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Color-Coded PVC Insulation Per Conductor
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CMR / FT4 Rated Brown PVC Jacket
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C(ETL)US Listed · CL2R · Sunlight Resistant
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500ft Reel (18/2–18/6) · 250ft Reel (18/8)
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Thermostat Wire 18AWG Solid Bare Copper CMR Brown – 2 3 4 5 8 Conductors
$94.99
SKU:
1331-Big
Regular price
$94.99
Unit price
-
SOLID BARE COPPER 18AWG solid copper delivers reliable HVAC control signals from thermostat to furnace and AC units.
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2 TO 8 CONDUCTORS Available in 2, 3, 4, 5, and 8-conductor versions for basic to multi-stage HVAC systems.
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CMR RISER RATED Meets CMR fire requirements for in-wall thermostat wiring in residential and commercial buildings.
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BROWN JACKET Standard brown jacket for easy identification alongside other low-voltage wiring.
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MULTIPLE LENGTHS Multiple pack sizes for single-room to whole-home HVAC thermostat cable installations.
Description
Description
Wire any thermostat or HVAC control system cleanly and reliably with this 18AWG solid bare copper thermostat wire, rated CMR / FT4 and C(ETL)US Listed for permanent in-wall and riser installations. Available in six conductor counts to match every system from a basic single-stage heater to a multi-stage smart thermostat or zoned heat pump installation.
The sunlight-resistant brown PVC jacket is the industry-standard jacket color for thermostat wire — easy to identify on the job and resistant to UV, moisture, and temperature extremes. Solid bare copper conductors ensure reliable signal and control over long runs between thermostats and HVAC equipment, doorbells, and security panel connections. Choose the conductor count that matches your system terminal count.
C(ETL)US Listed · CMR / FT4 · CL2 / CL2R · Sunlight Resistant
Common Specifications (all variants):
• Cable Type: Thermostat Wire, Riser (CMR)
• Conductor: Solid Bare Copper, 18AWG
• Insulation: Color-coded PVC
• Jacket: CMR-rated PVC, Brown, Sunlight Resistant
• Standards: CL2 / CL2R, CMR / FT4
• Certifications: C(ETL)US Listed, UL STD 444, CAN/CSA STD C22.2 NO.214
Conductor variants and recommended applications:
• 18/2 (0.132 in. OD, 500ft) — Basic heating, doorbells, simple controls
• 18/3 (0.140 in. OD, 500ft) — Single-stage heat/cool + fan
• 18/4 (0.154 in. OD, 500ft) — Most thermostats: R/G/Y/C terminals
• 18/5 (0.170 in. OD, 500ft) — Heat pumps, auxiliary heat systems
• 18/6 (0.186 in. OD, 500ft) — Multi-stage systems, emergency heat
• 18/8 (0.202 in. OD, 250ft) — Smart thermostats, zoned HVAC systems
When in doubt, always choose one conductor count higher than your current system needs — spare conductors make future upgrades easy.
Specifications
Specifications
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Colors
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