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 : THN750CST
SKU : THN750CST-250-BK
"Industrial-grade conductor for high-amperage power distribution—engineered with dual-rated THHN/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in critical 600V applications."
The 750 MCM copper building wire is a specialized high-output conductor designed for large-scale industrial feeders and primary commercial service entrances. It is the primary choice for circuits requiring up to 500 Amps of capacity in a single conductor. Our advanced stranded construction is essential at this massive scale, ensuring consistent electrical performance and high durability in demanding power environments.
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.
500-Amp Industrial Feeders: The standard conductor for 500-amp circuits in heavy manufacturing and industrial plants.
Main Utility Entrances: Connecting utility-scale transformers to the building’s primary distribution switchgear.
Data Center UPS Backbones: Managing massive amperage peaks in the power infrastructure of large-scale server farms.
Parallel Power Mains: Frequently run in parallel sets (2, 3, or 4 per phase) to handle 1,000A to 2,000A commercial service entrances.
Hospital Power Plants: Essential for the primary power distribution in large healthcare facilities where efficiency and stability are critical.
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: 475 amps at 75°C | 535 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) | 750 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 61 |
| Outer Diameter (OD) (in/mm) | 1.170 in. / 29.718 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 | 520 |
| 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-59565 |
| 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 | 2.48 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:
|
||||||||||||||||||||||||||||||||
750 MCM Copper is rated for 535 Amps at 90°C. However, because most industrial equipment and circuit breaker terminals are rated at 75°C, the allowable ampacity is set at 475 Amps. This makes it the premier choice for full 500-amp capacity circuits under the NEC "Next Standard Size Up" rule. We always recommend confirming wire size with a project engineer before purchasing.
For a standard 4-wire run, a 4-inch conduit is the recommended minimum. At this gauge, providing maximum "fill room" is essential not just for code compliance, but to allow the wire to be physically pulled without exceeding the tension limits of the nylon 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 the NEC "Next Standard Size Up" rule, 750 MCM (rated for 475 Amps at the 75°C column) is the standard conductor used for a 500-amp circuit breaker in commercial and industrial settings, provided the calculated load does not exceed 475 Amps.
No. Like all THHN/THWN-2 Wire, 750 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 2.48 lbs per foot. A standard 500-foot spool weighs over 1200 lbs. Professional-grade mechanical tuggers, high-capacity reel stands, and specialized wire lubricants are mandatory for a safe and successful installation.
Bending Space and Efficiency. 750 MCM Copper carries significantly more amperage (475A) than 1000 MCM Aluminum (445A) while having a much smaller diameter. This saves critical space in crowded electrical rooms and allows for much easier routing within large switchgear cabinets.
(833) 268-8644
Get this thing filled up so you can help Wire America!