Non-Metallic Wire

Non-metallic wire is the go-to choice for most residential and light commercial indoor wiring, prized for its ease of installation, clear labeling, and code-friendly performance. Often called NM-B or by the brand name Romex, this cable features copper conductors wrapped in color-coded insulation with a nonmetallic PVC jacket. It’s designed for dry, indoor locations and commonly used for branch circuits powering lights, receptacles, and general-use appliances.

You’ll find popular sizes like 14/2, 12/2, and 12/3 with ground, matching standard 15- and 20-amp circuits. The jacket color helps you identify gauge at a glance—typically white for 14 AWG, yellow for 12 AWG, and orange for 10 AWG—improving jobsite accuracy. NM-B carries a 600V rating with 90°C insulation (installed to the circuit’s 60°C ampacity per code), providing reliable performance behind walls and ceilings.

Planning an outdoor run or direct burial? Choose UF-B cable. It offers a tougher, sunlight-resistant, moisture-blocking jacket for exterior and below-grade installations without conduit. For low-voltage needs, options such as thermostat wire, bell wire, and landscape lighting cable maintain flexibility while delivering clean, dependable signal or power.

Benefits you’ll notice on day one:
- Faster pulls and cleaner cuts using a smooth PVC jacket
- Fewer fittings compared to metallic cable systems
- Clear print legends and footage markers for precise measuring
- Wide availability in bulk spools and cut lengths to reduce waste

For best results, pair non-metallic wire with proper cable staples, clamps, and boxes, keeping runs protected from physical damage. Follow NEC and local codes, protect against sharp edges, and avoid wet locations with NM-B. Stock from trusted names like Southwire, Cerrowire, and Romex brand gives you consistent quality, easy strip jackets, and dependable copper conductors—ideal for remodels, service upgrades, and new construction. Check gauge, amperage, and jacket rating to match your circuit needs and code.