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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 : NMB4-3
SKU : NMB4-3-250
Specifically optimized for heavy-amperage residential branch circuits, this 4 AWG NM-B Copper Building Wire provides the heavy-duty power delivery required for modern high-performance homes. Featuring two insulated copper conductors and a dedicated bare ground wire, this assembly is engineered for interior dry-location wiring where high conductivity and long-term reliability are paramount.
This 2-conductor (with ground) cable is a staple for professional contractors handling high-load appliances. The Type NM-B construction allows for a direct pull through wooden framing members without the added labor or cost of conduit, while the solid copper core ensures minimal voltage drop over long residential runs.
High-Efficiency Copper Core: Annealed (soft) copper conductors offer the superior electrical performance and flexibility needed for tight residential installs.
Low-Friction Pulling Jacket: The slick, black PVC outer jacket is designed to slide easily through bored holes in studs and joists, reducing physical strain on the installer.
Integrated Safety Ground: Includes a full-sized bare copper grounding conductor to ensure immediate fault current paths and total code compliance.
Dual-Layer Insulation: Individual conductors are protected by heat-resistant PVC and a slick nylon topcoat (THHN/THWN-2), providing enhanced protection against abrasion.
Conductor Size: 4 AWG
Number of Conductors: 2 (plus Ground)
Color Code: Black, White, Bare Ground
Ampacity: 70 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
Residential Electric Ranges: The industry standard for wiring dedicated circuits for high-wattage kitchen ranges and built-in ovens.
HVAC Condenser Units: Ideal for supplying power to large central air conditioning units and residential heat pump systems.
Home Workshop Sub-Panels: Frequently used to feed secondary 60A or 70A panels in garages or detached sheds.
Electric Vehicle (EV) Charging: A preferred solution for Level 2 EVSE installations that require sustained high-amperage delivery in a residential setting.
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) | 4 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.72 in. |
| Jacket Type | PVC |
| Conductor Count | 3 |
| Shield | Unshielded |
| Insulation Type | (PVC) Polyvinyl Chloride |
| UL Listing Numbers | UL 83 |
| Voltage Rating | 600V |
| Ampacity Rating | 70 |
| 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 | 0.548 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 4 AWG, 3-conductor Non-Metallic Sheathed Cable is a heavy-gauge power cable designed for high-capacity residential branch circuits. It is the go-to choice for massive electrical loads that require a dedicated neutral and ground. Common applications include wiring for electric vehicle (EV) fast chargers, large electric ranges, commercial-grade steam showers, and 70A to 80A sub-panels. Because it is rated NM-B, it is strictly for use in dry, indoor locations.
At the 4 AWG size, copper offers excellent conductivity with a smaller diameter than aluminum, making it easier to pull through bored holes in wooden framing.
In accordance with NEC Article 334.80, NM-B cable must be sized based on the 60°C temperature column of the ampacity table, regardless of the higher heat rating of the internal insulation.
⚠️ PRO TIP: Even if your breaker is rated for 75°C, you must abide by the 60°C rule for NM-B. Consequently, a 70 Amp circuit breaker is the maximum standard protection allowed for this cable in most jurisdictions.
This cable follows standard North American color-coding for 120/240V systems:
While smaller gauges of NM-B (like 14, 12, and 10 AWG) use color-coded jackets to indicate gauge, heavy-duty sizes like 4 AWG typically utilize a Black outer jacket. The jacket is made of a tough, flame-retardant PVC that includes a nylon coating on the internal conductors for easier pulling.
While 4/3 NM-B is powerful, it has specific environmental and mechanical limitations:
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