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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 : THN1CST
SKU : THN1CST-250-BK
"The heavy-duty feeder standard for high-amperage residential and commercial services—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #1 AWG copper building wire is a high-performance conductor specified for 110-amp to 130-amp circuits. It is commonly used for commercial motor feeders, large residential sub-panels, and service entrance conductors. Our stranded construction is essential at this thickness, providing the flexibility required to "train" the wire inside a switchgear cabinet and land it securely in heavy-duty lugs.
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.
125-Amp Heavy-Duty Feeders: The ideal "over-sized" choice for a 125-amp sub-panel where you want maximum efficiency and minimal heat.
Commercial Branch Circuits: Frequently used for large commercial HVAC units and industrial air handlers.
150-Amp Residential Main Services: Often permitted as the main service entrance for a single-family dwelling (per NEC 310.12), though not for sub-panels.
Solar Inverter Commercial Runs: Connecting large-scale solar power inverters to the main distribution switchgear.
Industrial Motor Feeds: Providing high-torque power for 3-phase industrial machinery and large pump stations.
Backup Power Systems: Used for large-scale battery storage systems and high-wattage industrial standby generators.
ENGINEERING OVERVIEW: 1 AWG STR THHN 600V
APPLICATION: Feeder wire for sub-panels, large appliances, and industrial power distribution.
VOLTAGE: Rated for 600 Volts.
CONDUCTORS: Stranded soft-annealed copper.
INSULATION: Heat and moisture-resistant PVC (Polyvinyl Chloride).
JACKET: Tough, abrasion-resistant Nylon.
TEMPERATURE: 90°C Dry (THHN), 90°C Wet (THWN-2).
Ampacity: 110 amps @ 60°C | 130 amps at 75°C | 145 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) | 1 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.450 in. / 11.43 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 | 145 |
| 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-59554 |
| 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 | 0.3 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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1 AWG THHN copper is rated for 145 Amps at 90°C. However, standard equipment and breaker terminations are usually limited to 75°C, which sets the allowable ampacity at 130 Amps. For continuous loads, the draw should not exceed 80% of the breaker rating. We always recommend confirming wire size with a licensed electrician before purchasing.
For a standard 4-wire configuration (Two hots, a neutral, and a ground), a 1.5-inch conduit is the recommended minimum. While it may technically fit in smaller pipe under certain fill ratios, the 1.5-inch size is necessary to prevent damaging the nylon jacket during a difficult pull.
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.
Generally, no. While #1 Copper is sometimes permitted for a 150-amp residential main service (from the meter to the first disconnect), it is only rated for 130 Amps at the standard 75°C terminal column. For a 150-amp sub-panel feeder, the NEC typically requires 1/0 or 2/0 AWG copper. We always recommend consulting with a local electrician when selecting a size.
No. Like all THHN/THWN-2 products, 1 AWG is not rated for direct burial. It must be housed in a protective conduit (PVC or Rigid Metal) for all underground installations. For burial without conduit, look for Type USE-2 or Aluminum URD.
This is a common comparison for 125A–150A services. While 2/0 Aluminum is cheaper and lighter, 1 AWG Copper offers a much smaller diameter, allowing it to fit into smaller conduits and tighter enclosure spaces. Copper also provides superior conductivity and lower resistance over time.
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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