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 : BCSTR4/0-7
SKU : BCSTR4/0-7-250
"Designed for maximum electrical performance, heavy-duty grounding, bonding, and primary power distribution, this 4/0 Stranded Bare Copper wire is engineered for the highest-capacity infrastructure demands. Featuring soft-drawn (annealed) construction and a heavy-duty 7-strand layout, it provides the ultimate combination of structural ruggedness and high electrical mass, making it a reliable solution for utility substations, industrial facilities, and massive commercial grid systems."
This conductor is the definitive standard for industrial substation grounding grids, commercial service entrances, large multi-family building panels, and critical facility lightning protection networks. Stepping up to a 4/0 gauge provides an ultra-low-impedance, safe path to ground capable of clearing high-magnitude fault currents and severe lightning strikes without failing. Its heavy 7-strand concentric-lay layout uses thick, robust wires that maximize physical armor against backfill crushing and scraping during direct burial, while the high-purity copper guarantees a permanent, maintenance-free lifespan.
Maximum Conductivity: 99.9% pure, uninsulated copper delivers a massive, low-impedance path to ground to safely absorb high-amperage short circuits and lightning surges.
Soft-Drawn (Annealed): Despite its extreme thickness, the thermal annealing process relaxes the copper's crystalline matrix, ensuring the conductor remains highly workable for bending around lugs and layout routing.
Heavy 7-Strand Ruggedness: Engineered with seven thick individual copper strands, this layout provides exceptional tensile strength (over 6,400 lbs of breaking strength) and unmatched mechanical defense for direct burial or concrete encasement (Ufer grounds).
Inherent Environmental Shielding: Bare copper natively fights off moisture, oxidation, and aggressive soil chemistry, removing the need for a protective jacket when buried or cast in stone.
Conductor Size: 4/0
Construction: 7-Strand (Concentric-Lay)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.522 inches (13.25 mm)
Approx. Weight: 653.0 lbs per 1,000 ft (0.653 lb/ft)
DC Resistance at 20ºC: 0.0499 Ohms/1,000 ft
Rated Breaking Strength: 6,455 lbs
Ampacity Rating: 480 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 & Commercial Grounding Rings: The master gauge standard for burying deep ground loops around data centers, massive hospitals, and heavy industrial facilities.
Substation Grid Meshes: Essential for weaving primary subterranean safety grids and bonding multi-megawatt high-voltage utility transformers.
Main Commercial Service Entrances: Connecting heavy-duty 600A, 800A, and 1200A main service electrical distribution panels safely to ground.
High-Capacity Lightning Protection: Serving as the uninsulated, high-mass down-conductor backbone for commercial skyscrapers, communication masts, and industrial towers.
Renewable Energy Sub-Feeds: Extensively used for long-run, critical bonding of massive structural framing racks, solar inverter skids, and wind turbine grounding terminals.
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) | 4/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.522 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 480 |
| 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-370 |
| 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 | 0.6533 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 : BCSTR4/0-7
SKU : BCSTR4/0-7-250
Parent SKU : BCSTR4/0-7
SKU : BCSTR4/0-7-250
"Designed for maximum electrical performance, heavy-duty grounding, bonding, and primary power distribution, this 4/0 Stranded Bare Copper wire is engineered for the highest-capacity infrastructure demands. Featuring soft-drawn (annealed) construction and a heavy-duty 7-strand layout, it provides the ultimate combination of structural ruggedness and high electrical mass, making it a reliable solution for utility substations, industrial facilities, and massive commercial grid systems."
This conductor is the definitive standard for industrial substation grounding grids, commercial service entrances, large multi-family building panels, and critical facility lightning protection networks. Stepping up to a 4/0 gauge provides an ultra-low-impedance, safe path to ground capable of clearing high-magnitude fault currents and severe lightning strikes without failing. Its heavy 7-strand concentric-lay layout uses thick, robust wires that maximize physical armor against backfill crushing and scraping during direct burial, while the high-purity copper guarantees a permanent, maintenance-free lifespan.
Maximum Conductivity: 99.9% pure, uninsulated copper delivers a massive, low-impedance path to ground to safely absorb high-amperage short circuits and lightning surges.
Soft-Drawn (Annealed): Despite its extreme thickness, the thermal annealing process relaxes the copper's crystalline matrix, ensuring the conductor remains highly workable for bending around lugs and layout routing.
Heavy 7-Strand Ruggedness: Engineered with seven thick individual copper strands, this layout provides exceptional tensile strength (over 6,400 lbs of breaking strength) and unmatched mechanical defense for direct burial or concrete encasement (Ufer grounds).
Inherent Environmental Shielding: Bare copper natively fights off moisture, oxidation, and aggressive soil chemistry, removing the need for a protective jacket when buried or cast in stone.
Conductor Size: 4/0
Construction: 7-Strand (Concentric-Lay)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.522 inches (13.25 mm)
Approx. Weight: 653.0 lbs per 1,000 ft (0.653 lb/ft)
DC Resistance at 20ºC: 0.0499 Ohms/1,000 ft
Rated Breaking Strength: 6,455 lbs
Ampacity Rating: 480 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 & Commercial Grounding Rings: The master gauge standard for burying deep ground loops around data centers, massive hospitals, and heavy industrial facilities.
Substation Grid Meshes: Essential for weaving primary subterranean safety grids and bonding multi-megawatt high-voltage utility transformers.
Main Commercial Service Entrances: Connecting heavy-duty 600A, 800A, and 1200A main service electrical distribution panels safely to ground.
High-Capacity Lightning Protection: Serving as the uninsulated, high-mass down-conductor backbone for commercial skyscrapers, communication masts, and industrial towers.
Renewable Energy Sub-Feeds: Extensively used for long-run, critical bonding of massive structural framing racks, solar inverter skids, and wind turbine grounding terminals.
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) | 4/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.522 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 480 |
| 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-370 |
| 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 | 0.6533 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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4/0 bare copper wire is a high-capacity conductor used for heavy-duty electrical grounding, structural lightning protection, and industrial bonding. Because of its massive cross-sectional area and exceptional conductivity, it is the standard specification for routing high-voltage surges safely to the earth. It is primarily used for burying main perimeter ground rings around data centers, hospitals, and substations, building massive subsurface utility grids, creating structural concrete-encased Ufer grounds, and bonding high-output industrial generators or commercial solar fields.
The nominal outside diameter (OD) of a 4/0 AWG stranded bare copper wire is approximately 0.522 inches (13.25 mm).
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.
Yes. High-purity soft-drawn bare copper is naturally resilient to sub-surface corrosion and moisture. It is rated for Direct Burial and serves as the elite choice for underground grounding networks or concrete-embedded Ufer grounding grids.
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