Type UF-B cable meets or exceeds UL Standard 83, UL Standard 493, Federal Specification A-A-59544 and requirements of the National Electrical Code® (NFPA 70).
Type UF-B cable is manufactured as 2- or 3- conductor (Type THHN/THWN-2) cable, with a ground wire. Copper conductors are soft-annealed, solid or compressed stranded. Phase conductors are insulated with tough, heat- and moisture-resistant, lead-free Polyvinyl Chloride (PVC) over which a nylon (polyamide) or UL-recognized equivalent jacket is applied. They are jacketed with sunlight-, moisture- and fungus-resistant lead-free gray PVC.
Type UF-B cable is generally used as feeder to outside post lamps, pumps and other loads or apparatus fed from a distribution point in an existing building as specified in the National Electrical Code®. UF-B cable may be underground, including direct burial. Multiple conductor UF-B cable may be used for interior branch circuit wiring in residential or agricultural buildings at conductor temperatures not to exceed 90°C (with ampacity limited to that for 60°C conductors) as specified in the National Electrical Code®. Type UF-B can be used in applications permitted in Section 339 of the National Electrical Code®. Voltage rating for all applications is not to exceed 600 volts.