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 : THN1000CST
SKU : THN1000CST-250-BK
"The ultimate industrial conductor for maximum power delivery—engineered with dual-rated THHN/THWN-2 insulation and a high-performance nylon jacket for mission-critical 600V applications."
The 1000 MCM copper building wire represents the pinnacle of high-amperage power distribution. It is utilized in large-scale utility grids, massive industrial complexes, and primary commercial power vaults. At this extreme scale, our precision-stranded construction is vital, ensuring that the cable maintains its structural integrity and peak electrical efficiency under massive thermal and physical stress.
Extreme Amperage Capacity: The highest standard single-conductor capacity available, capable of handling nearly 600 Amps at peak ratings.
Dual-Rated for Global Utility Use: Fully compliant for dry locations up to 90°C and wet environments (THWN-2), making it the definitive choice for underground primary feeders and large-scale industrial infrastructure.
Industrial-Grade PVC/Nylon Insulation: Engineered to withstand extreme heat, moisture, and chemical exposure, ensuring a service life measured in decades.
Maximum Power Density: Delivers the highest possible conductivity per square inch of conduit space, allowing for massive power throughput in specialized commercial builds.
Utility-Scale Transformers: The primary connection between high-voltage utility transformers and building-wide main distribution switchgear.
Heavy Industrial Grids: Supplying power to the largest industrial motors, electric furnaces, and automated manufacturing lines in existence.
Mission-Critical Data Centers: Used as the primary backbone for massive power distribution units (PDUs) and backup generator arrays.
Multi-Building Campus Mains: Distributing high-amperage power from a central vault to satellite distribution centers in hospitals or universities.
Mega-Parallel Power Sets: Run in massive parallel groups to achieve systems rated for 3,000A to 5,000A.
ENGINEERING OVERVIEW: 1000 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: 545 amps at 75°C | 615 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) | 1000 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 61 |
| Outer Diameter (OD) (in/mm) | 1.320 in. / 33.528 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 | 615 |
| 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-59566 |
| 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 | 3.3 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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1000 MCM Copper is rated for 615 Amps at 90°C. However, since standard industrial equipment and large-frame circuit breakers are typically limited to 75°C, the allowable ampacity is 545 Amps. This makes it the go-to choice for 500-amp to 600-amp primary circuits. We always recommend verifying all engineering specs with a project lead before purchasing.
For a standard 4-wire run, a 5-inch conduit is the standard requirement. Because 1000 MCM is over an inch thick and extremely rigid, using a 5-inch pipe is necessary to provide the "fill room" needed to physically pull the cable through long runs without damaging the insulation.
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, 1000 MCM (rated for 545 Amps at the 75°C column) is often permitted for use with a 600-amp circuit breaker, provided the actual calculated load does not exceed 545 Amps.
No. Like all THHN/THWN-2 Wire, 1000 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.
This wire is a behemoth, weighing approximately 3.3 lbs per foot. A standard 500-foot spool weighs over 1,600 lbs. High-tonnage mechanical pulling equipment, heavy-duty industrial reel stands, and massive amounts of wire lubricant are mandatory for a safe installation.
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