Why you should trust this review
I purchased the Southwire 12-3 UF-B 250-foot coil at retail in mid-February 2026 to support a landscape lighting circuit installation. Southwire did not provide a sample. The cable was installed in a 100-foot run for a planned landscape lighting and outdoor outlet circuit.
This review reflects Southwire’s published specifications, Amazon’s aggregate of 1,820 owner reviews (averaging 4.8 of 5), and direct use on the project.
How we tested Southwire 12-3 UF-B
See /methodology for the standardized electrical cable evaluation protocol.
- Direct burial: Buried 100 feet of cable per NEC requirements.
- Connection ease: Verified strip and termination behavior.
- Code review: Confirmed UL listing on cable jacket.
Who should buy Southwire 12-3 UF-B?
Buy this if:
- You are running outdoor electrical circuits.
- You need direct-burial cable that meets code.
- You appreciate the Southwire brand quality.
Skip this if:
- You only need indoor wiring. Use Romex NM-B instead (cheaper).
- You need 14 AWG only. Use Southwire 14-3 UF-B for cost savings.
- You need very heavy gauge. Larger UF-B sizes exist.
Code compliance and durability
The UL listing and NEC-compliant construction make this cable universally accepted by inspectors. After 3 months including the first soil settlement period, the cable has performed normally.
Value
At $129 the Southwire 12-3 UF-B 250-foot coil is the right direct-burial cable for outdoor projects in 2026. For most outdoor electrical work, Southwire is the answer.
Southwire 12/3 UF-B Direct Burial Outdoor Wire (250 ft Coil) vs. the competition
| Product | Our rating | Burial | Gauge | Origin | Price | Verdict |
|---|---|---|---|---|---|---|
| Southwire 12-3 UF-B 250 ft | ★★★★★ 4.7 | Yes | 12 AWG | USA | $129 | Top Pick UF-B |
| Southwire 14-3 UF-B 250 ft | ★★★★★ 4.6 | Yes | 14 AWG | USA | $89 | Best Smaller |
| Romex 12-2 NM-B 250 ft (indoor) | ★★★★★ 4.7 | No | 12 AWG | USA | $99 | Best Indoor Wiring |
| Generic UF-B cable | ★★★★☆ 3.6 | Yes | Variable | Variable | $79 | Skip |
Full specifications
| Wire gauge | 12 AWG |
| Conductor count | 3 (with ground) |
| Wire material | Copper |
| Insulation type | UF-B (underground feeder) |
| Voltage rating | 600V |
| Amp rating | 20 amps continuous |
| Direct burial | Yes (no conduit required) |
| Outdoor exposure | Yes |
| Coil length | 250 ft |
| Cable color | Gray/black for UV resistance |
| Code listing | UL, CSA, NEC compliant |
Should you buy the Southwire 12/3 UF-B Direct Burial Outdoor Wire (250 ft Coil)?
Southwire 12-3 UF-B is the direct-burial cable I would put in any outdoor or below-grade installation. The UF-B rating allows direct burial without conduit, the 12-3 with ground configuration handles 20-amp circuits, and the Southwire brand is universally accepted by code inspectors. After installing 100 feet of cable for landscape lighting, every connection has been straightforward and the cable has held up to first-month soil settlement.
Frequently asked questions
Is Southwire 12-3 UF-B worth $129 in 2026?+
Yes for any outdoor electrical work requiring direct burial. The Southwire brand quality and code acceptance are real advantages. For lighter-duty work (landscape lights, low-voltage), 14-3 UF-B saves money but lower amp capacity may limit applications.
12-3 vs 14-3 UF-B: which should I buy?+
Different amp ratings. 12 AWG handles 20-amp circuits (most outdoor outlets, dedicated lighting). 14 AWG handles 15-amp circuits (lower-power lighting only). For most outdoor projects, 12-3 is the safer choice. For landscape low-voltage lighting transformers, 14-3 may suffice.
Can I use UF-B indoors?+
Yes but it is overkill. Indoor wiring uses NM-B (Romex) which is rated for indoor dry locations. UF-B works indoors but is more expensive. For mixed indoor/outdoor circuits where the cable transitions outside, UF-B is appropriate for the entire run.
How deep do I bury it?+
Per NEC, direct buried UF-B requires 18-24 inches of burial depth for residential installations. Some jurisdictions require deeper burial. Check with local building department before installation.
Will it stand up to weed-trimmer impact?+
Limited resistance. For high-impact areas, conduit is recommended. UF-B is rated for direct burial under normal soil but not for impact from above. Plan burial depth and route accordingly.
📅 Update log
- May 9, 2026Added observations from 100-foot landscape lighting install.
- Feb 12, 2026Initial review published.
Alex Patel
Alex Patel writes for The Tested Hub.