Southwire Thermostat Wire is manufactured using solid copper conductors with 6 mils of polyvinyl chloride PVC insulation. The two conductor cable is flat-multiconductor cables are round. Southwire's Thermostat Wire is a class 2 power-limited circuit cable for use in heating and air conditioning controls bell and alarm systems. Southwire's thermostat cable adheres to the following specifications: Class 2- Power Limited per NEC Article 725; MP- Multi Purpose Cable per Articles 725; 760; and 800; CM-Communication Cable per Article 800; FPL-Power Limited Fire Protective Signaling Cable per Article 760; Sunlight Resistant; PVC Insulation; and Solid Bare Copper per UL Standard 13; RoHS Compliant; OSHA Acceptable. Southwire provides a full line of products; in both copper and aluminum; for a wide range of applications. The company leads the industry in new and innovative products that help simplify installation; saving time and money. In addition to its standard product line; Southwire can also make custom products offering its customers the most complete line of products for almost any requirement or situation. No matter what the residential; commercial; or industrial application requires; you need look no farther. Southwire has just the right wire and cable product you're looking for.