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 : BCSTR250-19
SKU : BCSTR250-19-250
"Engineered for maximum electrical mass, heavy-duty grounding rings, and critical structural bonding, this 250 MCM Stranded Bare Copper wire is built to handle high-amperage infrastructure demands. Featuring high-purity, soft-drawn (annealed) construction, it provides an ultra-low-impedance path to ground, making it the definitive standard for industrial substations, commercial grid systems, and data center earth shields."
When project specifications move past standard AWG sizes, 250 MCM (kcmil) is a common choice for heavy commercial service entrances, lightning down-conductors, and subsurface grounding loops. This conductor is engineered to safely absorb and dissipate severe fault currents and lightning surges without breaking down. The uninsulated, stranded construction ensures the cable remains workable for field crews making bends around structural steel or routing through tight trenches. Because it is 99.9% pure copper, it natively resists moisture and harsh soil chemistry, guaranteeing a permanent, maintenance-free grounding grid.
Maximum Fault-Current Capacity: 99.9% pure, uninsulated copper provides a massive cross-sectional area to safely redirect high-magnitude short circuits into the earth.
Soft-Drawn (Annealed): Thermally treated to relax the copper's crystalline matrix, removing stiff wire memory so installers can easily manipulate the cable around grounding bars and lugs.
Direct Burial Resilience: Naturally immune to subsurface moisture and oxidation, removing the need for a protective jacket when cast in concrete or buried directly in soil.
Concentric-Lay Stranding: Multi-wire engineering delivers exceptional tensile strength and mechanical ruggedness, defending the wire against crushing or scraping during rough field backfilling.
ENGINEERING OVERVIEW
Conductor Size: 250 MCM (250 kcmil)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.574 inches (14.58 mm)
Approx. Weight: 772.0 lbs per 1,000 ft (0.772 lb/ft)
DC Resistance at 20ºC: 0.0423 Ohms/1,000 ft
Rated Breaking Strength: 7,627 lbs
Ampacity Rating: 530 Amps (Based on 75°C conductor temp; 25°C ambient; 2ft./sec. wind in sun)
Compliance Standards: ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay), Federal Spec QQ-W-343
Industrial Grounding Loops: The heavy-duty standard for burying primary ground rings around commercial high-rises, hospitals, and heavy industrial plants.
Substation Grid Meshes: Crucial for weaving underground safety mats and bonding high-voltage utility transformers and switchgear.
Large Service Entrances: Safely bonding main 800A, 1200A, and higher commercial distribution panels to the primary building ground.
Data Center Earth Shields: Extensively specified in mission-critical facilities to shield sensitive server arrays from static and external surges.
Lightning Protection Backbones: Used as the primary uninsulated down-conductor for communication towers, industrial smokestacks, and skyscrapers.
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) | 250 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.574 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 530 |
| Direct Burial Rating | Yes |
| Submersible | No |
| Sunlight Resistance Rating | Yes |
| Standards | ASTM B-1 Hard-drawn copper wire ASTM B-2 Medium-hard drawn copper wire ASTM B-3 Soft or annealed copper wire ASTM B-8 Concentric-lay stranded copper conductors: hard, medium-hard, or soft ASTM B-33 Tinned soft or annealed copper wire ASTM B-258 Federal Sepc QQ-W-372 |
| Miscellaneous Information | All values are nominal and subject to correction. *Ampacity based on 75ºC conductor temperature; 25ºC ambient temperature; 2ft./sec. wind in sun. |
| Primary Applications | Grounding Systems, Overhead Power Distribution, Ground Wire for Lightning Protection, Bonding Applications, Messenger and Support Wires |
| Common Uses |
|
| Weight per Foot | 0.7719 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.
Parent SKU : BCSTR250-19
SKU : BCSTR250-19-250
Parent SKU : BCSTR250-19
SKU : BCSTR250-19-250
"Engineered for maximum electrical mass, heavy-duty grounding rings, and critical structural bonding, this 250 MCM Stranded Bare Copper wire is built to handle high-amperage infrastructure demands. Featuring high-purity, soft-drawn (annealed) construction, it provides an ultra-low-impedance path to ground, making it the definitive standard for industrial substations, commercial grid systems, and data center earth shields."
When project specifications move past standard AWG sizes, 250 MCM (kcmil) is a common choice for heavy commercial service entrances, lightning down-conductors, and subsurface grounding loops. This conductor is engineered to safely absorb and dissipate severe fault currents and lightning surges without breaking down. The uninsulated, stranded construction ensures the cable remains workable for field crews making bends around structural steel or routing through tight trenches. Because it is 99.9% pure copper, it natively resists moisture and harsh soil chemistry, guaranteeing a permanent, maintenance-free grounding grid.
Maximum Fault-Current Capacity: 99.9% pure, uninsulated copper provides a massive cross-sectional area to safely redirect high-magnitude short circuits into the earth.
Soft-Drawn (Annealed): Thermally treated to relax the copper's crystalline matrix, removing stiff wire memory so installers can easily manipulate the cable around grounding bars and lugs.
Direct Burial Resilience: Naturally immune to subsurface moisture and oxidation, removing the need for a protective jacket when cast in concrete or buried directly in soil.
Concentric-Lay Stranding: Multi-wire engineering delivers exceptional tensile strength and mechanical ruggedness, defending the wire against crushing or scraping during rough field backfilling.
ENGINEERING OVERVIEW
Conductor Size: 250 MCM (250 kcmil)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.574 inches (14.58 mm)
Approx. Weight: 772.0 lbs per 1,000 ft (0.772 lb/ft)
DC Resistance at 20ºC: 0.0423 Ohms/1,000 ft
Rated Breaking Strength: 7,627 lbs
Ampacity Rating: 530 Amps (Based on 75°C conductor temp; 25°C ambient; 2ft./sec. wind in sun)
Compliance Standards: ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay), Federal Spec QQ-W-343
Industrial Grounding Loops: The heavy-duty standard for burying primary ground rings around commercial high-rises, hospitals, and heavy industrial plants.
Substation Grid Meshes: Crucial for weaving underground safety mats and bonding high-voltage utility transformers and switchgear.
Large Service Entrances: Safely bonding main 800A, 1200A, and higher commercial distribution panels to the primary building ground.
Data Center Earth Shields: Extensively specified in mission-critical facilities to shield sensitive server arrays from static and external surges.
Lightning Protection Backbones: Used as the primary uninsulated down-conductor for communication towers, industrial smokestacks, and skyscrapers.
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) | 250 MCM |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 19 |
| Outer Diameter (OD) (in/mm) | 0.574 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 530 |
| Direct Burial Rating | Yes |
| Submersible | No |
| Sunlight Resistance Rating | Yes |
| Standards | ASTM B-1 Hard-drawn copper wire ASTM B-2 Medium-hard drawn copper wire ASTM B-3 Soft or annealed copper wire ASTM B-8 Concentric-lay stranded copper conductors: hard, medium-hard, or soft ASTM B-33 Tinned soft or annealed copper wire ASTM B-258 Federal Sepc QQ-W-372 |
| Miscellaneous Information | All values are nominal and subject to correction. *Ampacity based on 75ºC conductor temperature; 25ºC ambient temperature; 2ft./sec. wind in sun. |
| Primary Applications | Grounding Systems, Overhead Power Distribution, Ground Wire for Lightning Protection, Bonding Applications, Messenger and Support Wires |
| Common Uses |
|
| Weight per Foot | 0.7719 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:
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250 MCM bare copper wire is an ultra-high-capacity conductor used for large-scale commercial, industrial, and utility grounding systems. Thanks to its massive cross-sectional area, it provides an exceptionally low-resistance path to the earth. It is the industry standard for burying main perimeter ground loops around data centers and hospitals, building subsurface substation grids, providing high-rise lightning protection, and grounding heavy-duty industrial transformers.
The nominal outside diameter (OD) of a 250 MCM stranded bare copper wire is approximately 0.574 inches (14.58 mm).
Minimum Requirement: For a single 250 MCM bare copper wire installed purely for physical protection from damage, a 1-1/4 inch PVC or EMT conduit is the standard code minimum for 40% fill.
Recommended: A 1-1/2 inch or 2-inch conduit is strongly recommended for long runs or runs containing multiple 90-degree elbows. At over half an inch thick, 250 MCM copper is incredibly heavy and stiff; a larger pipe dramatically reduces pulling friction and prevents binding.
Yes. This wire is fully rated for direct burial in soil and for direct encasement in heavy structural concrete footings (Ufer grounds). High-purity electrical copper naturally develops a protective patina when exposed to underground elements, making it highly resistant to soil-based chemical corrosion and moisture degradation for decades of reliable performance.
While both solid and stranded copper have the exact same electrical capacity, stranded wire is highly preferred by installers for its flexibility. Solid copper wire in larger gauges is incredibly rigid and behaves like a stiff metal rod in the field. Stranded wire allows installation crews to easily manipulate the conductor, bend it around foundation walls, and cleanly transition it into service panels without kinking or fighting the metal.
Wire America ships directly from regional hubs across the United States to get it to your job site fast. Most orders arrive on your doorstep within 2 to 4 business days, and for critical project deadlines or emergency line repairs, we offer expedited overnight shipping options at checkout. We stock everything from small 18 AWG to massive 1250 MCM bare copper—and we’re happy to cut it exactly to the foot (on most sizes) or ship it out on full bulk spools.
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