Southwire 400 ft. 12/2 Solid Romex Type NM-B WG Non-Metallic Wire is a purpose-built indoor wiring solution that combines durable construction with practical long-run efficiency. Featuring solid 12-gauge copper conductors, this NM-B cable delivers reliable current flow for standard residential circuits while simplifying installation in walls, attics, and other dry indoor spaces.
What makes this NM-B stand out
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Solid 12-gauge copper conductors provide sturdy performance for 20-amp circuits, minimizing voltage drop over longer runs and easing pull-through in tight spaces.
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Two insulated conductors plus copper ground give you a complete, code-ready circuit for outlets and lighting throughout the home.
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PVC insulation with a Nylon jacket delivers a tough, abrasion-resistant layer designed for indoor use while maintaining flexibility during installation.
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Flame-retardant jacket adds an extra safety margin in the event of heat exposure, helping you meet safety standards on residential jobs.
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600V rating aligns with typical household electrical requirements, ensuring suitability for standard power distribution tasks.
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UL Listed for dependable, recognized safety and compliance in residential projects.
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Direct Burial: Yes paired with indoor applicability provides added versatility, though always follow local codes and installation guidelines.
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400 ft spool minimizes the need for frequent splices, making it ideal for longer runs across rooms or open spaces.
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Bright yellow jacket enhances visibility on site, helping you identify circuit runs quickly during installation and maintenance.
Ideal uses and practical scenarios
Designed for residential wiring where a single, uninterrupted 12/2 NM-B run supports a 20-amp circuit for outlets and lighting. The solid copper construction aids in reliable termination and consistent performance in wall, ceiling, and attic installations. This cable is especially advantageous for projects that require fewer connections and quicker pull-through in dry indoor environments.
- New construction or major remodels that require code-compliant branch circuits for living spaces, kitchens, and bathrooms.
- Indoor residential installations where long runs reduce the number of joints and connectors.
- Projects that benefit from a long 400 ft spool to cover extensive interior layouts without frequent splicing.
Installation considerations and tips
Plan routes to minimize sharp bends and protect the cable from potential damage behind walls and along framing. Use appropriate staples and protective plates where the cable runs through studs or near surfaces. While the product notes Direct Burial: Yes, NM-B is typically installed indoors in dry locations; verify local codes and installation practices for any underground or mixed-use scenarios. Adhere to the 90°C temperature rating for normal residential loads to maintain insulation integrity, and ensure proper grounding with the copper ground conductor for a safe, reliable electrical system.
Specifications at a glance
- Conductor: 12 AWG solid copper
- Conductors: 2 (12/2) with ground
- Jacket: Nylon; Insulation: PVC
- Amp rating: 20A; Voltage rating: 600V
- Temperature rating: 90°C
- UL Listed: Yes
- Direct burial: Yes
- Length: 400 ft
- Color: Yellow
- Application: Indoor use; wet location: No
