Southwire 12-2 UF-B Wire with Ground 100 ft Gray

Direct burial rated without conduit requirement — that’s what makes this wire worth your money. Instead of running THWN through PVC pipe at double the material cost, you trench once and you’re done. Standard burial depth of 24 inches for residential per NEC Table 300.5, though check your local amendments. Montana contractors know the value of avoiding extra trips for forgotten conduit fittings.

Direct Burial Saves Time and Materials

The gray PVC jacket resists sunlight, moisture, and fungus — critical for Montana’s freeze-thaw cycles that destroy lesser wire insulation. At 96.1 pounds per 1000 feet, it’s heavier than standard NM-B, but you’re buying durability. The weight comes from proper jacket thickness that actually protects the conductors.

Skip the conduit math entirely. UF-B saves material costs compared to THWN-2 in PVC conduit, though you sacrifice some physical protection. For most residential outdoor circuits — post lights, shed power, irrigation controllers — the trade-off makes sense. Rocky Montana soil makes trenching expensive enough without adding conduit installation.

Specification	Value
Wire Gauge	12 AWG solid copper
Voltage Rating	600 Volts
Temperature Rating	90°C dry (ampacity limited to 60°C per NEC 334.80)
Weight	96.1 lbs per 1000 ft
Overall Diameter	0.183 inches
Jacket Material	Gray PVC - sunlight, moisture, and fungus resistant

The temperature rating deserves attention. Rated for 90°C but ampacity limited to 60°C calculations means you size breakers based on the lower number. Don’t let the 90°C rating fool you into undersizing protection.

20-Amp Outdoor Circuits Done Right

Standard applications include outdoor lamp posts, water pumps, irrigation systems, and outbuilding feeds. These are the bread-and-butter outdoor circuits every Montana contractor wires. The 12 AWG conductors handle 20-amp circuits — the workhorse size for real outdoor loads.

Customer reviews average 4.8 stars across 3,634 reviews. Contractors praise the solid copper construction and value for underground projects. The main complaint centers on the stiff jacket being difficult to strip — a legitimate gripe that costs time on the job.

Unlike NM-B with its paper-wrapped interior and loose jacket, UF-B features a solid moisture-resistant jacket that encapsulates the conductors. That’s the whole point. Moisture can’t migrate between conductors like it does in standard Romex buried where it shouldn’t be.

Installation Reality Check

The thick PVC jacket requires a dedicated cable stripper or careful utility knife work. Budget for proper stripping tools or watch your labor hours climb. Reviews consistently mention the jacket stiffness — it’s not your imagination. This wire fights back.

Can be pulled through conduit where extra mechanical protection is required. Some jurisdictions mandate conduit under driveways or where subject to physical damage. Check local codes for specific burial requirements and splice kit needs — Montana amendments vary by jurisdiction.

The 1-year limited manufacturer warranty covers defects in materials and workmanship. Standard coverage, nothing special. The real warranty is proper installation depth and avoiding physical damage during backfill.

Frequently Asked Questions

What’s the recommended burial depth for 12-2 UF-B wire in Montana?

Typical burial depth is 24 inches for residential applications per NEC Table 300.5. However, local amendments may require deeper burial, especially under driveways or in areas subject to deep frost. Always verify with your local inspector.

Do regular wire strippers work on UF-B cable?

The thick PVC jacket is designed for moisture protection and requires a dedicated cable stripper or utility knife used with care. Standard strippers won’t cut it. Invest in proper UF cable strippers to save time and avoid nicking conductors.

What’s the real difference between UF-B and standard Romex?

UF-B features a solid, moisture-resistant jacket that encapsulates the conductors, whereas NM-B has a paper-wrapped interior and a looser jacket. UF-B is designed for wet locations and direct burial. Romex is indoor-only wire that will fail underground.

Is 12-2 UF-B suitable for a 100-foot run to an outbuilding?

Yes, the 100 ft roll of 12-2 UF-B cable works well for typical outbuilding feeds. Applications include feeding garages, barns, and sheds. For 20-amp circuits, voltage drop on a 100-foot run stays within acceptable limits for most loads.