2 STRANDED BARE COPPER CONDUCTORS: Stranded cables offer a variety of benefits when compared to solid wiring. The most notable is flexibility, which allows for easy installation and increased safety. The bare copper wire is used for grounding purposes for additional safety. This stranded cable has an outside diameter of.112. UL-LISTED, ART 800 PLENUM: Plenum cable is run in the plenum spaces of buildings, which means it runs in the spaces typically used to wire heating and air conditioning systems. This flexible wiring is Underwriters Laboratories certified and abides by Article 800, which is a rating given by the NEC (National Electrical Code) that refers to building and quality standards relevant to wiring. CL3-RATED, SHIELD AND DRAIN WIRE: This 22 AWG 2 conductor cord has been given a CL3 rating, which refers to its in-wall classification. This wiring is rated for safe in-wall use and can support up to 300 volts. The UL-listed conduit or wiring shield is composed of an alum