From $0.20/ft
128 Products
-
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 : THN500CST
SKU : THN500CST-250-BK
"The ultimate solution for high-capacity industrial power—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications."
The 500 MCM copper building wire is the definitive industry standard for 400-amp services and massive power distribution networks. It is the primary choice for main service entrances, large-scale industrial feeders, and critical infrastructure projects. The stranded construction ensures consistent electrical performance and long-term durability, even under the most demanding continuous loads.
Dual-Rated Protection: Fully compliant for dry locations up to 90°C and wet environments (THWN-2), providing total reliability for both indoor switchgear and outdoor underground conduits.
Maximum Conductivity: Manufactured with soft-annealed copper to deliver peak electrical efficiency and cooler operating temperatures at the terminals.
Slick-Pull Nylon Jacket: Features a high-performance outer sheath that significantly reduces pulling tension, which is vital when navigating the heavy weight of 500 MCM through long conduit runs.
Extreme Durability: Engineered to resist heat, moisture, oil, and gasoline, making it the top choice for refineries, industrial plants, and heavy manufacturing.
400-Amp Main Services: The industry-standard conductor for 400-amp service entrances in large commercial buildings.
Data Center Power Mains: Used in single or parallel sets to provide high-conductivity, stable power to server banks and massive UPS systems.
Heavy Industrial Feeders: The backbone for massive 3-phase manufacturing equipment, industrial ovens, and large-scale motor control centers.
Parallel Power Arrays: Frequently run in sets of 2, 3, or 4 per phase to achieve ultra-high amperage ratings (800A to 1600A) for skyscrapers and factories.
Utility Infrastructure: Used to connect large utility transformers to building main distribution panels.
ENGINEERING OVERVIEW: 500 MCM STR THHN 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: 380 amps at 75°C | 430 amps at 90°CÂ
Â
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.
Â
| Wire Size (AWG/MCM) | 500 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 37 |
| Outer Diameter (OD) (in/mm) | 0.960 in. / 24.384 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 | 430 |
| 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-59563 |
| 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 | 1.64 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.
Get notified when this product is back in stock
Physical Specifications
Technical Specifications
Usage & Installation:
Packaging & Dimensions:
|
||||||||||||||||||||||||||||||||
500 MCM Copper is rated for 430 Amps at 90°C. However, most standard industrial equipment and circuit breakers are rated at 75°C, which sets the allowable ampacity at 380 Amps. This makes it the standard conductor for 400-amp circuits under the NEC "Next Standard Size Up" rule. We always recommend confirming wire size with a licensed electrician before purchasing.
For a standard 4-wire run (three phases and a neutral), a 3-inch conduit is the code minimum. However, for long runs or runs with multiple bends, industrial contractors almost always use 3.5-inch or 4-inch conduit to make the pull physically manageable and to prevent damaging the wire jacket.
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. Under NEC 240.4(B), 500 MCM (which is rated for 380 Amps at the 75°C terminal column) is the standard conductor permitted for use with a 400-amp circuit breaker in most commercial and industrial applications, provided the actual calculated load does not exceed 380 Amps.
No. Like all THHN/THWN-2 Wire, 500 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 1.64 lbs per foot. A standard 500-foot spool weighs over 800 lbs. Professional-grade mechanical tuggers, high-capacity reel stands, and specialized wire lubricants are mandatory for a safe and successful installation.
Space and Efficiency. 500 MCM Copper provides roughly the same power delivery as 750 MCM Aluminum but has a much smaller diameter. This allows for the use of smaller conduit and provides significantly more "bending room" inside tight switchgear cabinets and enclosures.
(833) 268-8644
Get this thing filled up so you can help Wire America!