Extrusion Constructed of 0.06″ extruded aluminum with 0.045″ PVC bus bar support holding 12 gauge round bus bars.Polarity groove is located on face of track to indicate location of grounding conductor.Electrical Single circuit power distribution system designed to supply lighting unit flexibly.Single hot and neutral conductors are rated for maximum capacity of 20 Amps (2400 watts per circuit) at 120V.Copper electrical conductors are concealed in thermo-plastic, low-profile track section.Compatibility Track system is compatible with all A-Line® and Juno® style 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.