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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 : NMB6-2
SKU : NMB6-2-250
A versatile staple for residential power, this 6 AWG NM-B Copper Building Wire is specifically engineered for high-demand interior branch circuits. Featuring two high-conductivity copper conductors and a dedicated bare grounding wire, this assembly provides a reliable, high-performance solution for powering the essential heavy-duty appliances in modern homes.
This 2-conductor (with ground) cable is designed for ease of use in dry-location residential wiring. The Type NM-B construction allows for direct routing through wooden framing members without the added complexity of conduit, while the solid annealed copper ensures minimal voltage drop and superior electrical efficiency for sustained loads.
High-Purity Copper Conductors: Soft-drawn copper provides maximum electrical throughput and remains flexible for easier termination and routing.
Streamlined Pulling Geometry: The flat, low-friction PVC jacket is optimized to glide through bored studs and joists, significantly reducing physical strain during the rough-in phase.
Simplified Grounding Path: Includes a full-sized bare copper grounding conductor to ensure immediate fault protection and total code compliance.
Advanced Insulation Shielding: Individual conductors are protected with heat-resistant PVC and a smooth nylon outer layer (THHN/THWN-2) to resist nicks and abrasions.
Conductor Size: 6 AWG
Number of Conductors: 2 (plus Ground)
Color Code: Black, White, Bare Ground
Ampacity: 55 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 Water Heaters: The standard gauge for dedicated circuits supplying high-capacity residential water heating units.
Mini-Split HVAC Systems: Ideal for powering external condenser units and indoor air handlers requiring 50A circuits.
240V Garage Circuits: Frequently used for heavy-duty power tools, compressors, and welders in home workshops.
Large Appliance Feeders: A reliable choice for dedicated circuits for high-wattage equipment where a separate neutral is not required.
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.
*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) | 6 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | .350 x .710 in. |
| Jacket Type | PVC |
| Conductor Count | 2 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83 |
| Voltage Rating | 600V |
| Ampacity Rating | 55 |
| 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 | 0.271 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:
Packaging & Dimensions:
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This 6 AWG, 2-conductor Non-Metallic Sheathed Cable is a heavy-duty residential power cable designed for high-amperage 240V circuits that do not require a neutral wire. It is the industry standard for dedicated 240V loads such as electric water heaters, baseboard heaters, and certain central air conditioning units. It is also frequently utilized for Level 2 EV chargers that utilize a 2-wire plus ground configuration (such as a NEMA 6-50 plug or hardwired setup).
At the 6 AWG size, copper provides the thermal stability and low resistance required for continuous high-draw equipment.
In accordance with NEC Article 334.80, all NM-B cables must be rated based on the 60°C temperature column of Table 310.16. While the internal copper conductors are insulated with 90°C rated material, the overall assembly is limited to the 60°C rating to account for the heat-retention properties of residential wall cavities.
⚠️ PRO TIP: Since 55 Amps is not a standard breaker size, NEC 240.4(B) often allows you to move to the "next standard size up," which is a 60 Amp breaker, provided the actual calculated load of the appliance does not exceed 55 Amps.
This cable is designed for 240V branch circuits and follows standard identification:
While 14, 12, and 10 AWG NM-B use color-coded jackets, heavy-duty 6 AWG NM-B typically uses a Black outer jacket. The jacket is a flame-retardant, moisture-resistant PVC designed for easy pulling through wood framing.
To ensure long-term safety and code compliance, follow these installation rules:
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