UL Standards & Engagement Thermoplastic-Insulated Underground Feeder and Branch-Circuit Cables UL 493

1.1 These requirements cover 14 - 4/0 AWG single-conductor PVC-insulated and -jacketed underground feeder and branch-circuit cable and flat multiple-conductor PVC-jacketed underground feeder and branch-circuit cables containing two or three 14 - 6 AWG PVC-insulated circuit conductors with or without an equipment grounding conductor. These Type UF cables are intended for use in accordance with Article 340 and other applicable parts of the National Electrical Code, ANSI/NFPA 70 in wiring systems operating at a potential of 600 V or less. Submersible water-pump cables and multiple-conductor assemblies to which a type-letter designation is not assigned are also covered in these requirements. 1.2 Multiple-conductor cable that is marked "UF-B" has a 75°C jacket and conductors with insulation of 90°C dry and at least 60°C wet locations. Multiple-conductor cable that is marked "UF" has a 60°C jacket and conductors with insulation for 60°C dry and wet locations. Single-conductor cable is marked "UF" and has an integral insulation and jacket for 60°C dry and wet locations. The ampacity of all cables covered in these requirements is that of 60°C conductors. 1.3 These requirements do not cover insulation other than PVC, round cables containing two or more circuit conductors, flat cables containing more than three circuit conductors, or multiple-conductor cables containing circuit conductors larger than 6 AWG.