Sigma Wire & Cable | Bulk, Thermostat 18/3 CMR; 18AWG, 3C, Unshielded, 500ft Reel (Brown)
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SKU: 660-226
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The Sigma Wire Thermostat wire is a high-quality 18 gauge 3 conductor solid copper CMR (communications, multimedia, and riser) wire that is specifically designed for your heating and HVAC needs. The wire's solid copper construction ensures excellent conductivity and durability, while the CMR rating ensures that it is suitable for use in residential and commercial installations.
This thermostat wire is perfect for connecting thermostats to your heating and cooling systems, as well as for use in other HVAC applications. It is UL listed and meets all relevant safety standards, so you can trust that it will provide reliable performance for years to come.
The Sigma Wire Thermostat wire comes in a convenient spool, making it easy to cut and install as needed. It is also coated in a durable and flexible insulation, which helps to protect it from damage and makes it easy to route through walls and ceilings.
Rated 150-Volt
CMR Rated
Sunlight resistant (-20-Degree C to 60-Degree C)
18 gauge bare copper 2 conductors
Length - 500FT
Green compliant RoHS
low voltage
HVAC
alarm systems
4 Reasons Pros Buy Direct from Conversions Tech
Headquartered in business-friendly Wyoming, we design, test, and ship every product from inside the United States—delivering genuine “Made-for-America” quality without the big-box markup.
Our in-house team owns every CAD file, mold, and QA station behind our weatherproof boxes, conduit bodies, and power inverters. Vertical control means tighter tolerances, UL-listed safety, and up to 30 % lower cost than private-label imports.
Thousands of SKUs sit ready to go. Orders placed by 2 p.m. ship the same day, keeping contractors, OEMs, and distributors on schedule.
Need a torque spec or an OEM quote at dawn? You’ll speak directly with the Conversions Tech engineering desk—not a script reader—for instant answers, custom kitting, and private-label options.
Bottom line: For rugged, code-compliant electrical solutions shipped fast from a trusted U.S. source, choose Conversions Tech and build it right the first time.
