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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 : THN2CST
SKU : THN2CST-250-BK
"The definitive standard for 100-amp residential sub-panels and heavy commercial feeders—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The #2 AWG copper building wire is a high-performance feeder specified for 100-amp to 115-amp circuits. It is the go-to choice for powering detached workshops, large home additions, and industrial machinery. Our stranded construction is vital at this gauge, providing the necessary flexibility to "train" the wire inside a panel and land it securely in large 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 Sub-Panels: The standard conductor for high-capacity sub-panels in modern luxury homes and commercial retail spaces.
100-Amp Long-Distance Feeders: The go-to choice for 100A runs to detached buildings where voltage drop is a concern.
Standby Generator Sets: Frequently used to connect 20kW to 26kW home standby generators to the automatic transfer switch (ATS).
Commercial EV Charging: Ideal for powering dual-port Level 2 charging stations in parking garages and workplaces.
Industrial HVAC: Primary power feed for large commercial rooftop air handlers and refrigeration compressors.
ENGINEERING OVERVIEW: 2 AWG STR THHN 600V
APPLICATION: High-capacity feeder wire for 100A sub-panels, service entrances, 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:  95 amps @ 60°C | 115 amps at 75°C | 130 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) | 2 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.390 in. / 9.906 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 | 130 |
| 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-59553 |
| 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 | 0.235 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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2 AWG THHN copper is rated for 130 Amps at 90°C. At the standard 75°C terminal rating, it is rated for 115 Amps. This makes it the perfect "safe bet" for 100A circuits and the standard for 115A/125A applications. We always recommend confirming wire size with a licensed electrician before purchasing.
For a 4-wire sub-panel run (Two hots, a neutral, and a ground), a 1.25-inch conduit is the standard minimum. For longer pulls or runs with multiple bends, moving to a 1.5-inch conduit will significantly reduce the physical effort required.
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. 2 AWG THHN is arguably the best choice for a 100-amp panel to ensure zero voltage issues, and it is the code-standard for a 125-amp sub-panel feeder (at the 75°C rating).
No. Like all THHN, it must be in conduit if underground. For direct burial, look for Type USE-2 or Aluminum URD.
For 2 AWG THHN copper wire used in a typical 100A–125A residential subpanel, you generally need a #6 AWG copper grounding conductor, while a 200A service typically requires a #4 AWG copper or larger based on NEC Table 250.122
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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