Extrusion Constructed of 0.06″ extruded aluminum with 0.045″ one-piece PVC thermoplastic insulator support holding solid copper 14 gauge round conductors.Polarity groove is located on face of track to assure proper electrical connection. All track sections supplied with two insulated end caps.Electrical 2-Circuit power distribution system designed to supply lighting unit flexibly.With two (2) hot conductors and one common neutral, each circuit is rated 20A (2 × 20A = 40A max) at 120V. Each circuit allows the control of two individual sets of fixtures, thus enabling the use of two separately switched circuits on one section or run.Compatibility Track system is compatible with all A-Line® track fixtures, accessories and connectors.Mounting This track is surface mounted using the supplied mounting hardware. Suspended mounting is available with accessories (ordered separately).Labels cULus listed.