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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 : NMB8-3
SKU : NMB8-3-250
Providing the high-performance backbone for major household systems, this 8 AWG NM-B Copper Building Wire is engineered for reliability and safety. Comprised of two insulated copper conductors and a dedicated bare ground, this cable is the industry standard for intermediate-load appliances, offering a perfect balance of high ampacity and the superior flexibility of soft-drawn copper.
This 2-conductor (plus ground) assembly is a critical component for residential renovations and new construction. Designed strictly for dry, interior locations, the Type NM-B construction allows for efficient routing through wood-frame structures without the added expense of metal or PVC conduit, significantly accelerating the rough-in process.
Premium Annealed Copper: High-purity copper conductors ensure maximum electrical throughput with minimal heat generation, protecting the longevity of your appliances and home electrical system.
Installer-Friendly Pulling: The smooth, black PVC outer jacket is formulated to minimize surface friction, allowing the cable to glide through bored studs and tight corners with ease.
Redundant Safety Grounding: Includes a full-sized bare copper grounding wire to provide a continuous, low-impedance path to the ground, ensuring maximum protection against electrical faults.
Multi-Layer Insulation Technology: Each conductor is protected by a high-grade PVC insulation and a tough nylon topcoat (THHN/THWN-2), offering superior resistance to nicks, tears, and environmental stress.
Conductor Size: 8 AWG
Number of Conductors: 2 (plus Ground)
Color Code: Black, White, Bare Ground
Jacket Color: Black
Ampacity: 40 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
Electric Ranges & Ovens: The primary choice for dedicated 40A circuits supplying high-wattage kitchen cooking equipment.
Large HVAC Systems: Ideal for powering central air conditioning condenser units and residential heat pump systems.
Hot Tub & Spa Sub-Panels: Frequently used for the interior portion of the run feeding hot tub disconnects or indoor sauna equipment.
Heavy-Duty Power Tools: A reliable solution for dedicated garage or workshop circuits serving welders, large compressors, and industrial-grade table saws.
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) | 8 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.53 in. |
| Jacket Type | PVC |
| Conductor Count | 3 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83 |
| Voltage Rating | 600V |
| Ampacity Rating | 40 |
| 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 | 0.243 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
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This 8 AWG, 3-conductor cable is the specific choice for residential appliances that require a 120/240V "split-phase" connection. Unlike the 2-conductor version, 8/3 NM-B provides two "hot" legs, a dedicated neutral, and a ground. This is required for equipment that uses 240V for high-heat components (like heating elements) but also uses 120V for sensitive onboard electronics (like digital displays, timers, or fans). It is most commonly used for electric ranges, ovens, and large portable generator inlets.
The "3-conductor" designation refers to the three insulated wires (Black, Red, and White), but the cable also includes a bare copper grounding wire.
When working with NM-B (Non-Metallic Sheathed Cable), the NEC Article 334.80 requires that you use the 60°C column for ampacity calculations, even if the internal wires are rated for 90°C. For 8 AWG copper, this limits the cable to a 40-amp maximum. Using this wire for a 50-amp circuit (common for some larger ranges) is a code violation. If your appliance nameplate specifies a 50-amp requirement, you must move up to a 6-gauge NM-B cable to ensure the wire does not overheat within the wall cavity.
8 AWG copper is significantly heavier and stiffer than standard 12 or 14 AWG house wire.
NM-B cable is designed strictly for dry, indoor locations.
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