Uf является маркой кабеля по системе NEC / UL (USA): UF = Underground feeder, direct burial; -B = Conductors rated 90 C; UF-B = Underground feeder cable, type B, sunlight-resistant gray jacket, direct burial. 600 V, 90 C conductors (ampacity at the 60 C column). UL 493; NEC Article 340.
Underground feeder cable, type B, sunlight-resistant gray jacket, direct burial. 600 V, 90 C conductors (ampacity at the 60 C column). UL 493; NEC Article 340