Also Known As: 

6/3 Copper Underground Feeder Cable, 6/3 Copper Direct Burial Feeder Cable, 6/3 Branch Circuit Wiring Cable, 6/3 UF-B Wire, 6/3 Copper Direct Earth Burial Cable, 6/3 Copper Branch Circuit Cable, 6/3 UF-B Direct Burial Wire, 6 3 uf wire, direct burial cable,  6 3 underground wire

Conductor:

UF-B wire has solid or stranded Type THHN/THWN that are laid parallel with an uninsulated grounding conductor. The conductors are made of stranded annealed bare copper.

Insulation:

The cable is insulated with a PVC jacket with a nylon covering. It is resistant to moisture, grease, corrosion, sunlight, and chemicals.