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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 : THN8CST
SKU : THN8CST-250-BK
"The versatile standard for residential and commercial power circuits, engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #8 AWG copper building wire is the go-to choice for high-draw branch circuits, such as electric water heaters, smaller sub-panels, and EV charging stations. Its dual rating ensures peak performance in both indoor dry locations and outdoor underground conduits.
Dual Rated (THHN/THWN-2): Engineered for dry locations up to 90°C (THHN) and wet or oily locations (THWN-2), providing maximum versatility for commercial and residential projects.
Tough PVC/Nylon Jacket: The moisture and heat-resistant PVC insulation is protected by a slick, friction-reducing Nylon outer sheath, designed for easier pulls through long conduit runs.
Responsive Stranded Copper: Manufactured with soft-annealed stranded copper to provide easier handling and superior electrical conductivity for tight junction box terminations.
Chemical & Oil Resistant: The specialized jacket resists degradation from oils and chemicals, making it ideal for industrial machinery and commercial service applications.
Here are the targeted Common Applications for 8 AWG THHN/THWN-2 Copper.
Since #8 is the "heavy-hitter" of residential circuits and the starting point for small commercial feeders, these applications focus on high-amperage appliances and sub-panel installations.
Electric Ranges & Cooktops: The industry standard for residential kitchen cooking appliances requiring 40-amp or 50-amp circuits.
EV Charging Stations: A top-tier choice for Level 2 home electric vehicle chargers (like Tesla Wall Connectors) that require a 40A or 50A breaker.
Residential Sub-Panels: Ideal for powering 40A–50A sub-panels in detached garages, home workshops, or basement additions.
Hot Tubs & Spas: Frequently used as the feeder for 240V hot tubs requiring a 50-amp GFCI-protected circuit.
Central AC Condensers: Used as the primary power supply for large residential or light commercial air conditioning units and heat pumps.
Heavy Workshop Machinery: Perfect for powering 240V industrial-grade tools like table saws, welders, and air compressors.
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ENGINEERING OVERVIEW: 8 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:  40 amps @ 60°C | 50 amps at 75°C | 55 amps at 90°CÂ
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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) | 8 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.230 in. / 5.842 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 | 55 |
| 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-59549 |
| 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 | 0.066 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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8 AWG THHN copper wire is rated for 55 Amps at 90°C. However, most standard electrical terminations require following the 75°C column of the NEC, which limits the allowable ampacity to 50 Amps. It is commonly used for 40A or 50A circuits depending on the application and temperature ratings of the connected equipment.
A 1/2-inch conduit is typically sufficient for up to three 8 AWG conductors. If you are pulling four or more wires (such as for a 3-phase system with a neutral), moving to a 3/4-inch conduit is recommended to stay within the NEC 40% fill limit and ensure a smooth pull without damaging the nylon jacket.
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, 8 AWG copper is a very common choice for 40-amp EV chargers and electric water heaters. Because it is stranded, it is much easier to work with inside the charger or heater housing than solid wire. Ensure your breaker size and equipment requirements match the 50A limit (at 75°C) of the wire.
Yes, provided it is installed in a conduit. Because this wire is dual-rated as THWN-2, it is fully protected against moisture and can be used in outdoor or underground conduits. However, it cannot be used for direct burial; for that application, you would require a Type UF-B (Underground Feeder) or Type USE-2.
For a standard 240V circuit, you can typically run 8 AWG copper up to 100-125 feet without significant voltage drop. If your run to a sub-panel or heavy appliance exceeds that amount, it is often recommended to "upsize" to 6 AWG to ensure your equipment receives the full voltage required for efficient operation. Maintaining a voltage drop of less than 3% is key for the longevity of sensitive electronics and motors.
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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