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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 : THN6CST
SKU : THN6CST-250-BK
"The industry standard for residential and commercial branch circuits, engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #6 AWG copper building wire is the primary choice for high-ampacity branch circuits, such as range outlets, heat pumps, and small sub-panel feeders. Its dual rating ensures it performs in both bone-dry and fully saturated conduits.
Dual Rated (THHN/THWN-2): Engineered for dry locations up to 90°C (THHN) and wet locations (THWN-2), providing maximum versatility for indoor and outdoor conduits.
Tough PVC/Nylon Jacket: The high-heat and moisture-resistant PVC insulation is protected by a tough, friction-reducing Nylon outer sheath, making for easier pulls through tight bends.
High-Conductivity Copper: Manufactured with soft-annealed stranded copper to provide maximum flexibility and superior electrical conductivity for branch circuits and feeders.
Oil & Gasoline Resistant: The specialized jacket is designed to resist chemical degradation, making it ideal for industrial environments and service station wiring.
60-Amp Sub-Panels: The most popular conductor for powering 60-amp sub-panels in finished basements, home offices, and detached workshops.
High-Power EV Charging: The preferred gauge for high-output Level 2 EV chargers (48A continuous draw) that require a 60-amp circuit breaker.
Electric Commercial Cooking: Used for heavy-duty commercial deep fryers, ranges, and industrial ovens.
Central Heat Pumps: Ideal for the primary power feed to large residential heat pump systems and electric furnace heat strips.
Machinery Feeders: Frequently used in industrial settings to power 3-phase motors and hydraulic pumps.
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ENGINEERING OVERVIEW: 6 AWG STR THHN 600V
APPLICATION: Used for branch circuits and feeders in residential, commercial, and industrial power distribution.
VOLTAGE: Rated for 600 Volts.
CONDUCTORS: Stranded soft-annealed copper.
INSULATION: Heat and moisture-resistant PVC (Polyvinyl Chloride).
JACKET: Clear nylon (polyamide)
TEMPERATURE: 90°C Dry (THHN), 90°C Wet (THWN-2).
Ampacity: 55 amps @ 60°C | 65 amps at 75°C (wet) | 75 amps at 90°C (dry)
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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.
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| Wire Size (AWG/MCM) | 6 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.250 in. / 6.35 mm |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | (THHN) Thermoplastic High Heat-Resistant Nylon-coated |
| UL Listing Numbers | UL 83, UL 1063, UL 758 |
| Voltage Rating | 600V |
| Ampacity Rating | 75 |
| Submersible | No |
| Standards | UL 83 UL VW-1 Size 1/0 & larger suitable for cable tray use MTW per UL 1063 ASTM B1, B3, B8 Federal Spec A-A-59550 |
| Miscellaneous Information | All values are nominal and subject to correction. *90°C Wet/Dry Per NEC Table 310.15 (B)(16) for not more than three conductors in raceway based on 30°C ambient temperature. |
| Primary Applications | General-purpose electrical wiring in commercial, industrial, and residential structures. It's widely used to supply power to outlets, switches, lighting fixtures, and other electrical loads throughout a building |
| Weight per Foot | 0.098 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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6 AWG THHN copper wire is rated for 75 Amps at 90°C. However, in most residential and commercial applications, the circuit breaker and equipment terminals are limited to 75°C, which sets the allowable ampacity at 65 Amps. For continuous loads (like an EV charger), the load should not exceed 80% of the breaker rating. We always recommend confirming wire size and local code requirements with a licensed electrician before purchasing.
For a standard 3-wire run (Two hots and a ground), a 3/4-inch conduit is the minimum. If you are pulling a 4-wire system (Two hots, a neutral, and a ground) for a sub-panel, we recommend a 1-inch conduit to provide enough "fill room" for an easier pull and better heat dissipation.
Note on Conduit Sizing: These recommendations are based on standard NEC 40% fill guidelines for general informational purposes. Always consult with a licensed electrician or project engineer to verify final conduit specifications and gauge size.
Yes, #6 copper is commonly used for 60-amp EV charging circuits. Because it can handle a 48-amp continuous load safely under the 80% rule, it is the required size for the fastest Level 2 home chargers that provide maximum power to the vehicle.
No, 6 AWG THHN is not rated for direct burial. The THWN-2 rating allows it to be used in underground conduits where water may be present, but the jacket cannot withstand direct soil contact. For direct burial without conduit, you must use Type UF-B (Underground Feeder) or Type USE-2.
Per NEC Table 250.122, if you are using a 60-amp circuit breaker, a #10 AWG copper ground is typically required. Using a smaller ground wire than the "hot" conductors is standard practice, but always verify your specific local code and breaker size before installation. Many electricians also choose #8 THHN for the ground.
It is a technical acronym describing the wire’s construction: T (Thermoplastic insulation), HH (High-Heat resistant), N (Nylon-coated), and W (Wet-rated). The "-2" is a critical modern rating, signifying that the wire maintains its full 90°C heat resistance even in wet environments, making it more durable than older versions of the wire.
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