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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 : BCSTR3/0-7
SKU : BCSTR3/0-7-250
"Designed for high-capacity grounding, bonding, and overhead power distribution, this 3/0 Stranded Bare Copper wire is engineered for heavy-duty electrical performance. Featuring soft-drawn (annealed) construction and a robust 7-strand layout, it provides the ideal combination of structural integrity and electrical mass, making it a reliable solution for utility, industrial, and commercial electrical systems."
This conductor is a primary choice for utility substation grounding grids, high-amp commercial service entrances, industrial facilities, and heavy-duty lightning protection networks. Moving up to the 3/0 gauge provides a massive cross-sectional area over smaller conductors, ensuring a safer, ultra-low-impedance path to ground to dissipate severe fault currents or lightning strikes. Its heavy 7-strand concentric-lay construction maximizes physical toughness for rugged environments, while the high-purity copper guarantees a permanent, maintenance-free structural lifespan.
High-Capacity Conductivity: 99.9% pure copper provides a massive, low-impedance path to safely ground high-magnitude fault currents and lightning surges.
Soft-Drawn (Annealed): Despite its thickness, the thermal annealing process relaxes the copper's crystalline structure, ensuring the wire remains flexible enough for bending around grounding lugs and routing through trenches.
7-Strand Design: Built with seven thick concentric strands, this layout provides exceptional tensile strength (over 5,100 lbs of rated strength) and robust mechanical durability for direct burial or concrete encasement.
Natural Environmental Shielding: Uninsulated bare copper offers inherent, long-term resistance to galvanic corrosion when placed directly in soil, rock beds, or concrete (Ufer grounds).
ENGINEERING OVERVIEW
Conductor Size: 3/0 AWG
Construction: 7-Strand (Concentric-Lay)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.464 inches (11.79 mm)
Approx. Weight: 518.1 lbs per 1,000 ft (0.5181 lb/ft)
DC Resistance at 20ºC: 0.06304 Ohms/1,000 ft
Rated Strength: 5,118 lbs
Ampacity Rating: 410 Amps (Based on 75°C conductor temp; 25°C ambient; 2ft./sec. wind in sun)
Compliance Standards:Â ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay), Federal Spec QQ-W-343Â
Commercial Service Grounding: Seamlessly connecting heavy-duty main electrical service panels to the grounding electrode system.
Substation Grid Networks: Essential for creating subterranean grounding mesh grids and bonding high-voltage transformers in utility substations.
Industrial Ground Loops: The structural standard for buried ground rings surrounding data centers, processing plants, and critical infrastructure.
Lightning Down-Conductors: Providing an extra-high-capacity, uninsulated path for commercial lightning protection networks on tall buildings and utility towers.
Utility & Solar Bonding: Used for long-run, heavy-duty bonding of metallic structural steel, equipment chassis, and commercial solar rack arrays back to the main ground bus.
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) | 3/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.464 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 410 |
| 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-368 |
| 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 | 0.5181 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 : BCSTR3/0-7
SKU : BCSTR3/0-7-250
Parent SKU : BCSTR3/0-7
SKU : BCSTR3/0-7-250
"Designed for high-capacity grounding, bonding, and overhead power distribution, this 3/0 Stranded Bare Copper wire is engineered for heavy-duty electrical performance. Featuring soft-drawn (annealed) construction and a robust 7-strand layout, it provides the ideal combination of structural integrity and electrical mass, making it a reliable solution for utility, industrial, and commercial electrical systems."
This conductor is a primary choice for utility substation grounding grids, high-amp commercial service entrances, industrial facilities, and heavy-duty lightning protection networks. Moving up to the 3/0 gauge provides a massive cross-sectional area over smaller conductors, ensuring a safer, ultra-low-impedance path to ground to dissipate severe fault currents or lightning strikes. Its heavy 7-strand concentric-lay construction maximizes physical toughness for rugged environments, while the high-purity copper guarantees a permanent, maintenance-free structural lifespan.
High-Capacity Conductivity: 99.9% pure copper provides a massive, low-impedance path to safely ground high-magnitude fault currents and lightning surges.
Soft-Drawn (Annealed): Despite its thickness, the thermal annealing process relaxes the copper's crystalline structure, ensuring the wire remains flexible enough for bending around grounding lugs and routing through trenches.
7-Strand Design: Built with seven thick concentric strands, this layout provides exceptional tensile strength (over 5,100 lbs of rated strength) and robust mechanical durability for direct burial or concrete encasement.
Natural Environmental Shielding: Uninsulated bare copper offers inherent, long-term resistance to galvanic corrosion when placed directly in soil, rock beds, or concrete (Ufer grounds).
ENGINEERING OVERVIEW
Conductor Size: 3/0 AWG
Construction: 7-Strand (Concentric-Lay)
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.464 inches (11.79 mm)
Approx. Weight: 518.1 lbs per 1,000 ft (0.5181 lb/ft)
DC Resistance at 20ºC: 0.06304 Ohms/1,000 ft
Rated Strength: 5,118 lbs
Ampacity Rating: 410 Amps (Based on 75°C conductor temp; 25°C ambient; 2ft./sec. wind in sun)
Compliance Standards:Â ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay), Federal Spec QQ-W-343Â
Commercial Service Grounding: Seamlessly connecting heavy-duty main electrical service panels to the grounding electrode system.
Substation Grid Networks: Essential for creating subterranean grounding mesh grids and bonding high-voltage transformers in utility substations.
Industrial Ground Loops: The structural standard for buried ground rings surrounding data centers, processing plants, and critical infrastructure.
Lightning Down-Conductors: Providing an extra-high-capacity, uninsulated path for commercial lightning protection networks on tall buildings and utility towers.
Utility & Solar Bonding: Used for long-run, heavy-duty bonding of metallic structural steel, equipment chassis, and commercial solar rack arrays back to the main ground bus.
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) | 3/0 |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.464 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 410 |
| 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-368 |
| 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 | 0.5181 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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3/0 is a heavy-duty conductor typically used for high-amperage grounding. It is most commonly found as the main grounding wire for large industrial buildings, buried ground rings for sensitive facilities (like data centers), and as a primary grounding source for utility-scale transformers and substations.
The nominal outside diameter (OD) of a 3/0 stranded bare copper wire is approximately 0.464 inches (11.79 mm). Because it is a stranded assembly, it has a slightly larger physical footprint than a solid 3/0 wire, which provides the flexibility necessary for heavy commercial installations.
Minimum Requirement: For a single 3/0 bare copper grounding wire installed purely for physical protection, a 1-inch PVC or EMT conduit is the absolute code minimum.
Recommended: A 1-1/4 inch or 1-1/2 inch conduit is strongly recommended for runs with multiple bends or long pull distances. At nearly half an inch thick, 3/0 copper is heavy and rigid; a larger pipe ensures a much smoother pull and prevents the wire from binding.
Yes. This wire can be buried directly in the soil and for encasement in concrete (often referred to as a Ufer ground or concrete-encased electrode). High-purity electrical copper naturally resists moisture and soil-based chemical degradation, making it the industry standard for permanent underground grounding grids.
Note: While copper resists most soil conditions, always check local codes if you are dealing with highly acidic or chemically treated soils.
In the American Wire Gauge (AWG) system, 3/0 (three-ought) is larger than 2/0 (two-ought). The 3/0 wire contains more copper cross-sectional area, meaning it has lower electrical resistance and can safely dissipate significantly higher fault currents—such as those from major industrial equipment short circuits or direct lightning strikes.
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