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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 : THN2/0CST
SKU : THN2/0CST-250-BK
The definitive standard for 200-amp residential services and high-capacity industrial feeders—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.
The 2/0 copper building wire is a high-performance conductor engineered for maximum power delivery. It is the primary choice for 175-amp to 200-amp residential services, large commercial rooftop HVAC units, and industrial switchgear. Our stranded construction is essential at this gauge, providing the necessary flexibility to navigate 2-inch or 2.5-inch conduit bends and land securely in high-torque mechanical 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.
200-Amp Residential Services: The standard conductor for 200A main service entrances in single-family homes (per NEC 310.12).
175-Amp Commercial Feeders: Used for high-output commercial distribution to heavy machinery or sub-panels.
Large Standby Generators: Connecting industrial-grade standby generators (30kW+) to automatic transfer switches.
Industrial Battery Storage: Primary feeders for utility-scale battery backups and UPS systems.
Large Commercial EV Hubs: Providing the backbone power for multiple high-speed DC fast chargers.
ENGINEERING OVERVIEW: 2/0 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: 175 amps at 75°C | 195 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) | 2/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.540 in. / 13.716 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 | 195 |
| 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-59556 |
| 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 | 0.46 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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2/0 THHN copper wire is rated for 195 Amps at 90°C. However, per the NEC 75°C column (standard for most breakers and terminals), the allowable ampacity is 175 Amps. For residential "Main Power" applications, many jurisdictions allow 2/0 copper for 200-amp services under specific code exceptions—always verify with local inspectors and electricians before purchasing.
A 2-inch conduit is the standard for a 4-wire run of 2/0 AWG. This provides enough fill-room to pull the heavy gauge wire without excessive friction.
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.
It depends on the type of panel. 2/0 AWG Copper is the industry standard for a 200-amp main residential service (the line coming from your meter). However, if you are running power to a 200-amp sub-panel (like in a detached garage or workshop), electrical code typically requires the larger 3/0 AWG Copper. To avoid inspection issues, we strongly recommend confirming with your local inspector or electrician which code applies to your specific project.
No. Like all THHN/THWN-2 products, 2/0 must be installed in conduit for all underground applications. For direct burial without conduit, you must use Type USE-2 or Aluminum URD.
2/0 Copper is much thinner and easier to pull through tight spots than 4/0 Aluminum, but it is a higher investment. 4/0 Aluminum is the industry standard for cost-savings on 200A services, provided you have the conduit space to accommodate the larger diameter.
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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