UL 493

Description / Abstract: 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 a 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.

Multiple-conductor cable that is marked ²UF-B² has a 75°C (167°F) jacket and conductors with insulation of 90°C (194°F) dry and at least 60°C (140°F) wet locations. Multiple-conductor cable that is marked ²UF² has a 60°C (140°F) jacket and conductors with insulation for 60°C (140°F) dry and wet locations. Single-conductor cable is marked ²UF² and has an integral insulation and jacket for 60°C (140°F) dry and wet locations. The ampacity of all cables covered in these requirements is that of 60°C (140°F) conductors.

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.