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Solid THHN/THWN-2 WireFrom $0.20/ft -
Solid THHN/THWN-2 WireFrom $0.20/ft - Solid THHN/THWN-2 WireFrom $0.20/ft
- Solid THHN/THWN-2 WireFrom $0.20/ft
Parent SKU : NMB12-3
SKU : NMB12-3-250
Engineered for elite efficiency in residential and commercial interiors, this 12 AWG NM-B Copper Building Wire with a distinctive Purple Jacket is designed for high-performance 20-amp branch circuits. This cable provides a premium, labor-saving solution for interior wiring, offering the superior conductivity of annealed copper in a format that stands out on the job site for rapid identification and organized circuit management.
This 2-conductor (plus ground) configuration is a fundamental requirement for modern high-density electrical loads. The Type NM-B designation allows for rapid installation through wood-frame structures without the need for conduit. The unique purple color is often utilized by contractors to distinguish specific circuit types (such as AFCI/GFCI dedicated lines or lighting controls) from standard 20-amp yellow-jacketed runs.
Unique Purple Color Coding: The purple PVC jacket provides immediate visual differentiation on a crowded job site, helping crews and inspectors identify specific circuits or proprietary Priority-Plex® installations instantly.
Maximum Copper Conductivity: Soft-drawn copper conductors ensure the lowest electrical resistance and most reliable power delivery for sensitive electronics and high-use outlets.
Enhanced Pulling Performance: The outer PVC jacket is formulated with a slick finish to glide through bored studs and tight corners, reducing the physical effort required during rough-in.
Industrial-Grade Insulation: Each conductor is shielded with heat-resistant PVC and a tough nylon topcoat (THHN/THWN-2), providing an extra layer of defense against abrasion and nicks.
Conductor Size: 12 AWG
Number of Conductors: 2 (plus Ground)
Color Code: Black, White, Bare Ground
Jacket Color: Purple
Ampacity: 20 Amps at 60°C (NEC Table 310.16)
Voltage: 600V
Insulation: Polyvinyl Chloride (PVC) with Nylon Covering (Type THHN)
Max Temp: 90°C (Dry locations only)
Conductor Material: Annealed (Soft) Copper
Standards: UL Standard 83, UL Standard 719, ASTM B-3, B-8, Federal Spec A-A-59544
Specialized Kitchen Circuits: Ideal for dedicated GFCI-protected circuits serving high-wattage countertop appliances and food prep areas.
Home Automation & Lighting Controls: Often used to differentiate "smart home" or control circuits from standard general-purpose power.
Dedicated Home Office Power: The standard choice for computer workstations and high-end home theater systems that require a dedicated 20-amp feed.
Bathroom & Laundry Receptacles: A reliable solution for wiring high-wattage personal care tools and modern high-efficiency washing machines.
Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes. NM-B is for dry, indoor use only.
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*All values are nominal and subject to correction. Ampacity is based on the National Electrical Code (NEC) 60°C column for NM-B cable, regardless of the conductor temperature rating.
| Wire Size (AWG/MCM) | 12 AWG |
| Conductor Material | Copper |
| Conductor Type | Solid |
| Strand Count | 1 |
| Outer Diameter (OD) (in/mm) | .200 x .520 in. |
| Jacket Type | PVC |
| Conductor Count | 3 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83 |
| Voltage Rating | 600V |
| Ampacity Rating | 20 |
| Submersible | No |
| Temperature Rating | 90ºC |
| Standards | US 719 UL 83 ASTM B3 and B8 |
| Miscellaneous Information | All values are nominal and subject to correction. |
| RoHS Compliance | Yes |
| Primary Applications | Wiring outlets, switches, and lighting circuits in residential buildings. |
| Weight per Foot | 0.105 lb |
In-stock orders placed before 3pm EST typically ship within 1-2 business days. Our business days are Monday through Friday; we do not process orders on Saturday, Sunday, or major US Holidays.
You will receive an e-mail with a tracking number within 1-2 business days from the time its shipped. You will also be able to view your order status and tracking numbers in your account order history.
Expedited shipments are delivered Monday-Friday except on US Holidays. The order must be placed before 12pm CST to ship same day ( Mon-Fri Only).
You have 30 days from the day you receive the item to contact us for a return. Returns are subject to a 30% Restocking Fee.
Please contact us at help@wireamerica.com to request a return authorization. Have your order number or name the order was placed with ready and we will email you an RMA (return) number and instructions for return. Currently, we do not offer exchanges. A new order must be placed if you need a different item. If you provide the new order number at the time of your return request, the restocking fee may be lowered.
Orders on any items with a material value of $50 or less are non-returnable.
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Physical Specifications
Technical Specifications
Usage & Installation:
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This 12 AWG, 3-conductor cable is the heavy-duty upgrade from standard 14-gauge household wire. It is designed to handle 20-amp branch circuits, providing 25% more power capacity. The "3-conductor" configuration (Black, Red, White, and Ground) makes it the specific choice for multi-wire branch circuits (MWBC), 3-way lighting switches, and split-circuit kitchen receptacles. It is most commonly used in areas with high-draw appliances like dishwashers, garbage disposals, and small kitchen appliances.
While standard 12 AWG wire is typically yellow, the Purple Jacket is a specialty color-coding used to distinguish specific circuits or to meet certain regional or project-specific requirements.
The 12/3 configuration includes three insulated conductors (Black, Red, White) and a bare copper ground. This provides maximum versatility for residential wiring:
Per NEC Article 334.80, all NM-B cables are limited to the 60°C temperature column for ampacity. For 12 AWG copper, this fixes the limit at 20 Amps. Even though the internal THHN-style insulation is rated for 90°C, the assembly is capped at 20A to prevent heat buildup when the cable is run through thermal insulation or bundled tightly with other wires. This safety margin is critical for preventing the degradation of the cable's outer jacket over decades of use.
12 AWG solid copper is sturdier than 14 AWG and requires proper technique for a clean install:
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