From $0.20/ft
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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 : THN3/0CST
SKU : THN3/0CST-250-BK
"The high-performance feeder standard for 200-amp commercial services—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The 3/0 AWG copper building wire is a precision feeder designed for heavy electrical demands. It is the primary choice for 200-amp commercial panels, large-scale HVAC chillers, and industrial machinery. The stranded construction is a critical advantage at this size, offering the flexibility required to pull through 2-inch or 2.5-inch conduit runs and achieve high-torque terminations in 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 Sub-Panels: The professional’s choice for running full 200-amp power to detached workshops, garages, and commercial sub-panels.
Commercial Building Feeders: Used to distribute high-amperage power from the main service to floor-level distribution panels.
Large HVAC Systems: Ideal for powering massive commercial rooftop air handlers and chillers.
Industrial Machinery: Providing stable, high-capacity power for 3-phase manufacturing equipment.
ENGINEERING OVERVIEW: 3/0 STR THHN 600V
APPLICATION: Commercial service entrance conductors, heavy feeders, 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).
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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) | 3/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.600 in. / 15.24 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 | 225 |
| 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-59557 |
| 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 | 0.57 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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3/0 AWG THHN copper wire is rated for 225 Amps at 90°C. When following the NEC 75°C column (standard for most commercial breakers and terminals), the allowable ampacity is 200 Amps. This makes 3/0 copper a "perfect fit" for 200-amp commercial feeders.
A 2-inch conduit is the minimum standard for up to three 3/0 AWG conductors. If you are pulling a 4-wire system (three phases plus a neutral), a 2-inch or 2.5-inch conduit is required to stay within the NEC 40% fill limit. For long pulls with multiple bends, a 2.5-inch pipe is highly recommended to reduce pulling tension.
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, 3/0 AWG copper is the preferred choice for 200-Amp commercial service feeders. Unlike residential applications where 2/0 is often allowed under exceptions, commercial 200A services typically require 3/0 copper to meet the standard 75°C terminal rating for continuous loads. To avoid inspection issues, we strongly recommend confirming with your local inspector or electrician which code applies to your specific project.
Yes, provided it is installed in a protective conduit. The THWN-2 rating ensures the wire is engineered for wet locations, making it suitable for underground PVC or metal conduit systems where moisture is present. It is not, however, rated for direct burial; for that, you would need Type USE-2 or Aluminum URD.
While both wires are rated to carry 200 Amps, they serve different project needs. 3/0 Copper is preferred for tight spaces and commercial upgrades because its smaller diameter fits into smaller conduits and crowded panels. 250 MCM Aluminum is the industry leader for cost-savings; it is significantly cheaper and lighter than copper, but it requires much larger conduit and specialized anti-oxidant joint compound at all connection points.
Yes. Our Responsive Stranded Copper is essential at this size. It allows the wire to be "trained" into position inside the panel, which would be nearly impossible with solid wire of this thickness.
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