Product Description Permitted for use in direct burial applications such as exposed or concealed wiring in damp, moist, wet, dry and corrosive locations as specified by the NEC. Southwire underground feeder cable can be used in applications such as general branch wiring, new wiring, and replacement wiring. Southwire's type UF is a thermoplastic non-metallic sheathed cable. Solid copper conductor. Type TW conductor insulation color coded with thermoplastic overall jacket. UF Thermoplastic insulated 60° C wet or dry locations. UFB Thermoplastic insulated with conductors rated at 90° C. From the Manufacturer For applications of direct burial, dwellings not exceeding 3 floors above grade, underground feeder to outdoor lighting or apparatus, exposed or concealed wiring in damp, moist, wet, dry, and corrosive locations, general branch circuit wiring and new wiring or replacement wiring. Flame retardant, moisture and corrosion resistant. Sunlight resistant jacket. JC-30B Federal specification, ASTM B-3, ASTM B-8 and NY state DOS 16120-880923-2002. U.L. Listed. /2 = 2 insulated wires with bare ground. /3 = 3 insulated wires with bare ground.