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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 : NMB6-3
SKU : NMB6-3-250
A staple for modern residential electrical infrastructure, this 6 AWG NM-B Copper Building Wire is the professional’s choice for intermediate high-load circuits. Featuring two insulated current-carrying copper conductors and a dedicated bare ground, this cable provides a reliable, high-integrity power path for heavy household equipment while remaining flexible enough for easy routing through interior wood-frame construction.
This 2-conductor (plus ground) configuration is engineered specifically for indoor dry-location wiring. The Type NM-B classification allows for installation without conduit, saving significant labor time and material costs in residential settings. The use of premium annealed copper ensures low electrical resistance and minimal heat buildup, even during peak demand.
Optimized Copper Performance: Soft-drawn copper conductors deliver maximum conductivity and are easy to terminate in panel lugs and heavy-duty receptacles.
Simplified Installation Profile: The slick, black PVC outer jacket is designed to minimize drag when pulling through studs, joists, and tight attic spaces.
Integrated Safety Ground: Includes a full-sized bare copper grounding wire, ensuring a continuous low-impedance path for fault currents.
THHN-Grade Insulation: Each conductor is wrapped in heat-resistant PVC and finished with a clear nylon jacket, offering superior protection against nicks and abrasions during the pull.
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 Clothes Dryers: The preferred gauge for high-efficiency residential drying units requiring dedicated 30A to 50A circuits.
Small HVAC Systems: Ideal for powering mini-split systems, medium-sized air conditioning units, and specialized air handling equipment.
Kitchen Range Branch Circuits: Frequently used for standard electric ovens and cooktops in modern kitchen remodels.
Hot Tub and Spa Feeders: Often utilized for the interior portion of the run feeding hot tub disconnects or small indoor sauna heaters.
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) | 0.575 in. |
| Jacket Type | PVC |
| Conductor Count | 3 |
| 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 | 0.342 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 6 AWG, 3-conductor Non-Metallic Sheathed Cable is the industry standard for high-power residential branch circuits. It is most commonly used for heavy-duty appliances that require a 120/240V connection with a neutral and a ground. Typical applications include electric ranges, ovens, large hot tubs, and 50A to 60A sub-panels. It is also a popular choice for Level 2 EV Chargers that require a 50-amp circuit.
At the 6 AWG size, copper provides excellent conductivity and thermal stability, making it ideal for continuous high-load applications.
Per NEC Article 334.80, NM-B cable must be sized using the 60°C temperature column of Table 310.16. While the internal conductors are rated for 90°C, the overall cable assembly is limited to the 60°C rating to account for heat dissipation within thermal insulation and wood framing.
⚠️ PRO TIP: Because 55 Amps is not a standard circuit breaker size, NEC 240.4(B) (the "Next Standard Size Up" rule) often allows this cable to be protected by a 60 Amp breaker, provided the actual load does not exceed 55 Amps.
This cable follows the standard color-coding used for 120/240V circuits in North America:
While 14, 12, and 10 AWG NM-B cables use color-coded jackets (White, Yellow, and Orange respectively), heavy-gauge 6 AWG NM-B typically features a Black outer jacket. The jacket is a flame-retardant, heat-resistant PVC.
To maintain code compliance and safety, 6/3 NM-B has strict environmental requirements:
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