Regency's single conductor PE sprinkler systems wire is manufactured for the purpose of direct burial power wire applications in accordance with the National Electric Code. Conductor construction is soft drawn bare copper meeting the requirements of ASTM specification B3. Gauge sizes 14, 12 and 10 AWG are solid conductors. The insulation is a low density, high molecular weight polyethylene for systems applications of up to 600 V meeting the requirements of ASTM specification D1248. The PE sprinkler systems wire is constructed in accordance with Underwriters Laboratories Inc.