Type UF-B (Underground Feeder, Branch Circuit) cable rated 600 V for direct burial without conduit. The 10 AWG solid copper conductors share a single sunlight-resistant gray PVC jacket that is moisture-resistant, corrosion-resistant, and stays flexible in cold weather - well suited for outbuildings, post lamps, well pumps, garages, sheds, and other outdoor branch circuits.

• 10/3 configuration: one black, one red, and one white solid copper conductors plus a bare copper equipment grounding conductor
• Rated 30 A maximum ampacity at 60 degree C per NEC 310.16 (UF cable in wet locations)
• Sunlight, moisture, and corrosion resistant - approved for direct earth burial and wet locations
• Rated 90 degree C dry and 60 degree C wet per UL 493
• 600 V rating
• 250 Ft length per coil
• 30 A multi-wire branch or 240 V feed to detached structures - dryer feeds in outbuildings, 240 V well pumps with a 120 V control leg, or sub-panel feeders where a separate neutral is required

NM-B vs UF-B: Use UF-B for any outdoor, exterior, or buried run. NM-B (common indoor Romex) is NOT rated for wet locations or direct burial. UF-B has a solid extruded PVC jacket that fully encapsulates the conductors and seals out moisture, whereas NM-B's paper-wrapped construction wicks water. If the cable will touch soil, sit in a damp crawlspace, or run outdoors without conduit, UF-B is the right call.

Burial Depth Tip: Bury UF cable to the depth required by NEC 300.5 - commonly 24 in. for general direct-burial branch circuits, or 12 in. for GFCI-protected 120 V / 20 A residential branch circuits. Confirm depth and any additional requirements with your local AHJ. Use a UF-listed cable connector at every box, and protect the cable with conduit or a metal plate where it emerges from the ground or passes through a wall.

Voltage Drop Tip: Long underground runs to detached structures often exceed conduit-typical lengths. On runs over ~100 Ft at full ampacity, voltage drop can exceed the recommended 3 percent. For long well-pump or outbuilding feeds, step up one gauge (14 to 12, 12 to 10) rather than running the cable at its tabular ampacity limit.