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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 : THN600CST
SKU : THN600CST-250-BK
"The precision choice for high-amperage industrial power—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in heavy-duty 600V applications."
The 600 MCM copper building wire is a specialized high-capacity conductor designed for the most demanding electrical infrastructures. It is frequently utilized in large-scale industrial motor control centers, major commercial service entrances, and critical power distribution networks. Our advanced stranded construction ensures reliable conductivity and long-term performance in high-amperage environments where system uptime is essential.
Dual-Rated Versatility: Fully compliant for dry locations up to 90°C and wet environments (THWN-2), providing a robust solution for both internal switchgear and external underground conduit systems.
Superior Conductivity: Manufactured with high-grade, soft-annealed copper to ensure maximum energy efficiency and reduced heat generation during peak electrical draw.
Slick-Pull Nylon Jacket: The abrasion-resistant outer sheath is engineered to minimize pulling tension, a critical feature when installing cables of this weight through complex industrial bends.
Industrial Resilience: Designed to resist degradation from heat, moisture, oils, and chemicals, making it the standard for petrochemical plants, manufacturing hubs, and heavy industrial facilities.
Heavy-Duty 400A to 500A Feeders: Often used as an "oversized" conductor for 400-amp circuits over long distances to eliminate voltage drop.
Industrial Switchgear Mains: Connecting utility-scale transformers to building-wide distribution panels and manufacturing equipment.
Data Center Power Infrastructure: Used in parallel sets to provide high-conductivity power to massive uninterruptible power supply (UPS) banks.
Large HVAC Chiller Plants: The primary power feed for high-tonnage refrigeration units and commercial climate control systems.
Renewable Energy Hubs: Connecting large-scale solar inverters to commercial-scale distribution networks.
ENGINEERING OVERVIEW: 600 MCM STR 600V
APPLICATION: Industrial service entrance conductors, heavy feeders, and large-scale 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: 420 amps at 75°C | 475 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) | 600 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 61 |
| Outer Diameter (OD) (in/mm) | 1.051 in. / 26.695 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 | 475 |
| 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-59564 |
| 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 | 1.934 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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600 MCM Copper is rated for 475 Amps at 90°C. However, standard equipment and breaker terminations are typically limited to 75°C, which sets the allowable ampacity at 420 Amps. This makes it a high-performance choice for 400-amp circuits requiring a safer operating margin. We always recommend confirming wire size with a licensed electrician before purchasing.
For a standard 4-wire run, a 3.5-inch conduit is the recommended minimum. Because of the extreme weight and rigidity of 600 MCM, many industrial engineers prefer 4-inch conduit to ensure a smoother pull and better heat dissipation within the pipe.
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. In fact, 600 MCM is often used for 400-amp services when the distance between the transformer and the panel is significant. Using 600 MCM instead of the standard 500 MCM ensures your equipment receives full voltage and runs cooler under heavy continuous loads.
No. Like all THHN/THWN-2 Wire, 600 MCM must be installed in conduit (PVC or Rigid Metal) for all underground applications. It is not rated for direct soil contact. For burial without conduit, you must use Type USE-2 or Aluminum URD.
This wire is extremely heavy, weighing approximately 1.93 lbs per foot. A standard 500-foot spool weighs over 900 lbs. Professional-grade mechanical tuggers, high-capacity reel stands, and specialized wire lubricants are mandatory for a safe and successful installation.
Power-to-Size Ratio. 600 MCM Copper carries significantly more amperage (420A) than a comparable 750 MCM Aluminum (385A) while being much smaller in diameter. This allows you to fit more power into existing conduit systems and saves space inside crowded electrical rooms.
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