Southwire 250-ft 14 / 3 / Romex SIMpull Solid Indoor CU NM-B W/G Individual pack ( By-the-roll )

The Southwire 14/3 NM-B 250 ft Romex SIMpull is the residential branch circuit cable contractors pull when a 15-amp lighting circuit needs three-way switching or any configuration that requires three insulated conductors. As 14/3 wire with ground, the Southwire 14/3 NM-B 250 ft includes three insulated 14 AWG copper conductors plus a bare copper equipment ground, all enclosed in a white PVC jacket. The 14/3 Romex SIMpull jacket is the SIMpull friction-reducing version of standard NM-B, which cuts pull effort by roughly 50 percent compared to legacy Romex and meaningfully speeds up installation through bored studs and joists. As an NM-B 14/3 cable 250 ft spool, the unit length matches what most three-way switch lighting runs, ceiling fan installations, and dimmer integration projects actually consume on a typical residential rough-in. As a 14/3 indoor electrical wire rated for 600V at 90 degrees Celsius in dry locations, every Southwire 14/3 NM-B 250 ft spool is UL Listed, made in the USA, and ships nationwide from IB Lighting with free freight and contractor volume pricing. Manufacturer specifications are available at the official Southwire website.

Southwire 14/3 NM-B 250 ft Key Highlights

14/3 Romex SIMpull: Why the SIMpull Jacket Matters

The defining feature of the Southwire 14/3 NM-B 250 ft Romex SIMpull is the SIMpull jacket itself. Standard NM-B jackets have always been a friction surface, especially when pulled through bored holes in framing studs or stacked through multiple knockouts in a panel. SIMpull is Southwire’s friction-reducing surface treatment that turns a sticky pull into something closer to a pipe slide. Independent contractor testing puts the friction reduction at roughly 50 percent compared to legacy non-SIMpull NM-B, which translates directly into faster rough-in and less crew exhaustion at the end of a long day.

For a 250 foot spool of 14/3 Romex SIMpull, the practical impact is most noticeable on long horizontal runs through ceiling joists for three-way switching circuits, where standard cable would bind and require a second person to feed. With SIMpull, one electrician can typically handle a 30 to 40 foot run solo without binding. That is meaningful labor savings on a lighting rough-in or a remodel where multiple three-way switches are being added.

14/3 Wire with Ground: Three Insulated Conductors Plus Bare Copper

The “14/3 with ground” specification on the Southwire 14/3 NM-B 250 ft tells you everything about the conductor configuration. The “14” is the AWG gauge, which determines the current-carrying capacity of the wire. 14 AWG copper is rated for 15 amps in the National Electrical Code residential branch circuit table, which is the right size for typical residential lighting circuits and lighter-load receptacle branches. The “3” means three insulated current-carrying conductors. In NM-B 14/3, these are typically a black hot, a red hot (or “traveler” depending on the application), and a white neutral. The “with ground” portion is the bare copper equipment grounding conductor that runs alongside the insulated conductors inside the jacket.

The third insulated conductor is the key feature that distinguishes 14/3 from 14/2. The extra conductor lets you wire installations that 14/2 simply cannot handle: three-way switches that need a traveler between switch locations, ceiling fans with separate light and fan switching, smart switches that need a constant hot reference, and similar configurations that require three current-carrying conductors. Without the third conductor, none of these wiring schemes are possible with a single 14 AWG cable run.

Common Applications for the Southwire 14/3 NM-B 250 ft

The Southwire 14/3 NM-B 250 ft Romex SIMpull is the cable contractors specifically reach for when a 15-amp lighting installation goes beyond what 14/2 can handle. The most common applications include:

• Three-way and four-way switch lighting runs. Hallway, staircase, large room, and open-plan lighting controlled from two or more switch locations.
• Ceiling fan with separate light switching. Where the fan and the light kit are switched independently from a single wall switch box.
• Dimmer-integrated three-way switching. Where one or both ends of a three-way switch loop need dimmer functionality on the same cable run.
• Smart switch installations needing constant hot. Modern Wi-Fi smart switches often require both a switched and constant hot, plus a neutral, which 14/3 supplies cleanly.
• Half-switched receptacles on lighting circuits. Bedroom or living room outlets where a wall switch controls one half of a duplex receptacle for a lamp.
• Whole-house fan and exhaust fan installations. Where separate switching for fan speed and light functions requires the extra traveler conductor.

For simpler 15-amp single-pole switched lighting, basic receptacle branches, or any 14 AWG circuit with only two current-carrying conductors, 14/2 NM-B is the correct cable and is less expensive per foot. The Southwire 14/3 NM-B 250 ft is specifically the right pick when the lighting installation demands the third conductor.

Three-Way Switch Lighting Wiring: The Most Common Use of 14/3

The single most common application for the Southwire 14/3 NM-B 250 ft is three-way switch lighting. A three-way switch lets you control a single light fixture from two different locations, like both ends of a hallway, the top and bottom of a staircase, or the two main entrances to an open living area. The wiring requires running cable between the two switch locations that includes three current-carrying conductors plus a ground: typically one conductor as the common (carrying the switched output to the light), and two conductors as travelers (carrying the on/off state between the two switches).

A standard three-way switch installation for a 15-amp lighting branch uses 14/2 to bring power to the first switch box, then 14/3 between the two switch boxes (this is the traveler run), then either 14/2 or 14/3 from the second switch to the light fixture depending on circuit layout. The Southwire 14/3 NM-B 250 ft 250 foot spool is sized to handle multiple three-way switch traveler runs in a typical residential lighting rough-in.

Four-way switches (where you control a light from three or more locations, like a long hallway with three entry points) also use 14/3 between the four-way switch and each of the two three-way switches in the circuit. For these more complex switching scenarios, 14/3 is even more essential, and a 250 foot spool may be quickly consumed in larger homes with extensive three-way and four-way switching configurations.

Ceiling Fan and Dimmer Wiring with 14/3

The Southwire 14/3 NM-B 250 ft is the standard cable for ceiling fan installations where the fan and light are switched independently from the wall. Modern ceiling fans almost always include a light kit, and homeowners typically want separate control over the fan and the light from a single wall switch location. This requires two switch legs from the wall to the ceiling fan: one for the fan motor, one for the light kit. Plus a neutral for the fixture. Plus the ground. That is exactly what 14/3 with ground provides.

The same logic applies to dimmer-integrated three-way switching. When a homeowner wants both three-way switch control AND dimming on the same lighting circuit, the cable run between the switch locations needs to be 14/3 to support the dimmer function alongside the standard three-way switching scheme. This configuration is increasingly common in residential lighting upgrades, particularly in primary living areas where ambiance lighting is a priority.

Smart switch installations represent another growing application for 14/3. Wi-Fi connected smart switches typically need both a switched hot and a constant hot to power their internal radio and processor regardless of switch state, plus a neutral for the smart electronics, plus the ground. 14/3 supplies all four conductors in a single cable run, which makes smart switch upgrades meaningfully easier than they would be with 14/2 cable.

Code Compliance and Ratings

The Southwire 14/3 NM-B 250 ft Romex SIMpull is UL Listed and meets every requirement of the National Electrical Code (NEC) for residential branch circuit wiring. The cable carries a 600-volt insulation rating with a 90-degree Celsius temperature rating, with NEC ampacity calculated at 60 degrees Celsius at terminations to determine the maximum 15-amp circuit rating. NM-B specifically means “Non-Metallic, B-rated,” which is the code designation for the residential branch circuit cable approved for installation in dry, indoor locations protected from physical damage by the building structure.

NM-B is not approved for wet locations, direct burial, conduit fill in damp environments, or exterior installations where the cable would be exposed to weather. For those applications, UF (Underground Feeder) cable, THHN/THWN conductors in conduit, or Type SE service entrance cable are the correct alternatives. The white jacket color of the 14/3 NM-B is part of the industry-standard color coding system: white for 14 AWG, yellow for 12 AWG, orange for 10 AWG, and black for larger feeder cables. This makes visual sizing verification fast for both inspectors and crew during rough-in.

Southwire’s 14/3 NM-B is also manufactured in the USA, which matters for buyers who need supply chain assurance, predictable lead times, and the consistent code compliance that domestic manufacturing delivers. Made-in-USA status also makes the Southwire 14/3 NM-B 250 ft eligible for certain federal and state procurement programs that require domestic manufacture.

Southwire 14/3 NM-B 250 ft Specifications

Southwire 14/3 NM-B 250 ft FAQs

Who the Southwire 14/3 NM-B 250 ft Is Built For

The Southwire 14/3 NM-B 250 ft Romex SIMpull is built for two clear buyer types. The first is licensed electrical contractors running residential rough-ins and remodels where 15-amp lighting circuits include three-way switches, ceiling fans with independent fan and light control, dimmer integration, or smart switch installations. For these buyers, the SIMpull jacket pays for itself in labor savings on every long pull, the 250 foot spool is the right length for typical lighting circuit consumption, and bulk orders ship with contractor volume pricing applied automatically. Most lighting rough-ins use both 14/2 and 14/3, so contractors typically buy spools of each.

The second buyer is the serious DIY homeowner doing their own permitted electrical work, particularly when the project involves three-way switching upgrades or ceiling fan additions. Adding a three-way switch to control a hallway light from both ends, or installing a ceiling fan with separate light switching, are two of the most common residential DIY upgrades that genuinely improve a home. The Southwire 14/3 NM-B 250 ft is the same wire your electrician would pull, with no compromise on quality or code compliance.

If your project mixes simple 15-amp lighting with three-way switching, you will likely need both the Southwire 14/3 NM-B 250 ft and the Southwire 12/2 NM-B 250 ft in your bill of materials. Browse the full IB Lighting electrical wire collection for the complete range of NM-B sizes plus other cable types.

14/3 vs 14/2 Wire: Which Should You Buy?

The Southwire 14/3 NM-B 250 ft and the Southwire 14/2 NM-B 250 ft are siblings in the same Romex SIMpull family. Same 14 AWG solid copper conductors, same SIMpull jacket, same 600V 90C rating, same UL listing, same white jacket color, same 15-amp circuit rating. The only difference is the conductor count, and that single difference determines which cable is correct for your application.

Choose 14/3 NM-B if your circuit involves a three-way or four-way switch, a ceiling fan with separate light and fan switching, a dimmer-integrated three-way circuit, a smart switch installation that needs a constant hot, or any other 15-amp configuration that genuinely needs three insulated conductors. The Southwire 14/3 NM-B 250 ft is the right pick when 14/2 cannot do the job.

Choose 14/2 NM-B if your circuit is a standard 15-amp single-pole switched lighting branch, a typical bedroom or living room receptacle circuit, or any other configuration with two current-carrying conductors. 14/2 is the most common residential lighting branch wire and is meaningfully less expensive per foot than 14/3.

14/3 vs 12/3 Wire: Which Should You Buy?

The Southwire 14/3 NM-B 250 ft and the Southwire 12/3 NM-B 250 ft share the same three-conductor-plus-ground configuration but differ in gauge and amp rating. 14/3 is rated for 15 amps. 12/3 is rated for 20 amps. The choice between them is determined entirely by the amperage of the circuit you are wiring.

Choose 14/3 NM-B if your circuit is a 15-amp lighting branch that needs three conductors. This includes most residential three-way switch lighting, ceiling fans, dimmer integrations, and smart switch installations. The Southwire 14/3 NM-B 250 ft is lighter, easier to pull, and less expensive per foot than 12/3, which makes it the right pick when 15 amps genuinely matches the circuit design.

Choose 12/3 NM-B if your circuit is a 20-amp branch that needs three conductors. This includes kitchen counter receptacles wired as multi-wire branch circuits, 20-amp 240V appliance branches that need a neutral, or any 20-amp configuration with three current-carrying conductors. You can never use 14/3 on a 20-amp circuit, but you can use 12/3 on a 15-amp circuit if you prefer the extra capacity headroom (at higher cost).

Installation Tips for the Southwire 14/3 NM-B 250 ft

Pulling 14/3 Romex SIMpull through a residential framing rough-in is straightforward, but a few practices make the work faster and the inspection cleaner. First, drill all your stud and joist holes before starting any pulls. Holes should be at least 1.25 inches from the nearest stud edge to satisfy the NEC nail-plate requirement, and centered through the structural member when possible. Drill consistently sized holes in a straight line across multiple studs so the cable runs cleanly without dipping or rising between bays.

Use cable staples to secure the Southwire 14/3 NM-B 250 ft within 12 inches of every box and at intervals not exceeding 4.5 feet along the run, per NEC code. Do not over-tighten staples or you will crush the cable jacket and risk a code violation. Maintain at least 6 inches of free cable inside every electrical box to give yourself room to work during termination, and consider 8 inches for three-way switch boxes which can get crowded with traveler conductors and wire nuts.

For terminations, strip about 8 inches of jacket back at each box, leaving 6 inches of free conductor for splicing and termination. Use linesman pliers to make clean wire nut connections, and torque switch terminals to manufacturer spec. For three-way switches, label your travelers carefully during rough-in because mixing them up at trim-out leads to nonworking switching that takes meaningful troubleshooting time to resolve. Code requires nail plates over any cable run within 1.25 inches of the stud edge to protect against drywall screws and nails.

Bulk and Contractor Pricing

The Southwire 14/3 NM-B 250 ft is one of IB Lighting’s stocked wire SKUs because contractors buy it on most residential lighting rough-ins where three-way switching is part of the design. We offer automatic volume pricing on multi-spool orders, with deeper savings on larger bills of materials. For a typical residential rough-in covering multiple rooms with three-way switching and ceiling fans, a 2 to 4 spool order of 14/3 is common alongside 5 to 10 spools of 14/2, and these combined orders trigger our standard contractor pricing tier.

Free freight applies to every Southwire 14/3 NM-B 250 ft order regardless of quantity. Most orders ship within 1 to 2 business days and arrive within 5 to 6 business days. If you need a bill of materials priced and quoted before you order, the IB Lighting team can turn around a quote inside of a business day for most projects. Browse our complete electrical wire collection for THHN, UF, SE, and feeder cables to round out your project.

Browse the complete IB Lighting electrical wire and cable collection, compare against the Southwire 12/3 NM-B 250 ft (20-amp sibling) or the Southwire 12/2 NM-B 250 ft (2-conductor 20-amp sibling), explore other Southwire products, or visit our customer FAQ hub. Manufacturer technical sheets are available at the official Southwire website.