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,. Copper conductors are annealed (soft) copper, solid or compressed stranded. It can also be used for outbuildings such as garages and barns.
It can be used as an underground feeder from an existing building to outdoor lighting fixtures, pumps, outbuildings and other. Southwire outdoor wire, 12/2wg uf 100 ft coil, approved for direct burial wiring, sw 13055926 Even though they are hidden within the walls.