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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
SKU : BCSTR4-250
"Designed for high-conductivity grounding and bonding, this 4 AWG Stranded Bare Copper wire is engineered for peak performance. Featuring soft-drawn (annealed) construction, it provides the perfect balance of flexibility and strength, making it a reliable solution for residential, commercial, and industrial grounding systems."
This conductor is a top-tier choice for main service grounding, heavy-duty equipment bonding, and lightning protection circuits. Its stranded construction ensures it is easier to handle and install than stiff solid wire, while the high-purity copper ensures maximum safety for fault current paths.
High Conductivity: 99.9% pure copper ensures a low-resistance path for fault currents.
Soft-Drawn (Annealed): Heat-treated for maximum flexibility, making it easy to bend and shape in tight enclosures.
7-Strand Construction: Optimized for a secure fit under mechanical lugs, split bolts, and grounding clamps.
Versatile Use: Ideal for both indoor conduit runs and outdoor/direct burial grounding loops.
ENGINEERING OVERVIEW
Conductor Size: 4 AWG
Construction: 7-Strand
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.232 inches
Approx. Weight: 128.9 lbs per 1,000 ft
DC Resistance at 20ºC: 0.25340 Ohms/1000 ft.
Rated Strength: 1,320 lbs.
Amp Rating: 170 Amps @75C
Standards: ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay-Stranded), Federal Spec QQ-W-343.
Main Service Grounding: Connecting residential and commercial service panels to ground rods
Sub-Panel Bonding: Providing a robust safety ground for high-amperage detached structures or workshops.
Lightning Protection: A primary conductor for lightning rods and heavy-duty grounding discharge paths.
Solar Array Grounding: Bonding high-capacity solar panel frames and mounting racks to ensure system safety.
Industrial Equipment: Bonding heavy machinery and motor frames to prevent electrical shock in high-vibration environments.
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.
Ampacity: Based on 75°C conductor temperature; 25°C ambient temperature; 2ft./sec. wind in sun.
| Wire Size (AWG/MCM) | 4 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.232 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 170 |
| 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-360 |
| 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 | 0.1289 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
SKU : BCSTR4-250
Parent SKU : BCSTR4
SKU : BCSTR4-250
"Designed for high-conductivity grounding and bonding, this 4 AWG Stranded Bare Copper wire is engineered for peak performance. Featuring soft-drawn (annealed) construction, it provides the perfect balance of flexibility and strength, making it a reliable solution for residential, commercial, and industrial grounding systems."
This conductor is a top-tier choice for main service grounding, heavy-duty equipment bonding, and lightning protection circuits. Its stranded construction ensures it is easier to handle and install than stiff solid wire, while the high-purity copper ensures maximum safety for fault current paths.
High Conductivity: 99.9% pure copper ensures a low-resistance path for fault currents.
Soft-Drawn (Annealed): Heat-treated for maximum flexibility, making it easy to bend and shape in tight enclosures.
7-Strand Construction: Optimized for a secure fit under mechanical lugs, split bolts, and grounding clamps.
Versatile Use: Ideal for both indoor conduit runs and outdoor/direct burial grounding loops.
ENGINEERING OVERVIEW
Conductor Size: 4 AWG
Construction: 7-Strand
Temper: Soft-Drawn (Annealed)
Material: Bare Copper (Uninsulated)
Overall Diameter: 0.232 inches
Approx. Weight: 128.9 lbs per 1,000 ft
DC Resistance at 20ºC: 0.25340 Ohms/1000 ft.
Rated Strength: 1,320 lbs.
Amp Rating: 170 Amps @75C
Standards: ASTM B-3 (Soft/Annealed), ASTM B-8 (Concentric-Lay-Stranded), Federal Spec QQ-W-343.
Main Service Grounding: Connecting residential and commercial service panels to ground rods
Sub-Panel Bonding: Providing a robust safety ground for high-amperage detached structures or workshops.
Lightning Protection: A primary conductor for lightning rods and heavy-duty grounding discharge paths.
Solar Array Grounding: Bonding high-capacity solar panel frames and mounting racks to ensure system safety.
Industrial Equipment: Bonding heavy machinery and motor frames to prevent electrical shock in high-vibration environments.
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.
Ampacity: Based on 75°C conductor temperature; 25°C ambient temperature; 2ft./sec. wind in sun.
| Wire Size (AWG/MCM) | 4 AWG |
| Conductor Material | Copper |
| Conductor Type | Stranded |
| Strand Count | 7 |
| Outer Diameter (OD) (in/mm) | 0.232 in. |
| Conductor Count | 1 |
| Shield | Unshielded |
| Ampacity Rating | 170 |
| 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-360 |
| 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 | 0.1289 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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Because it is uninsulated and highly conductive, 4 gauge bare copper is primarily used for grounding and bonding systems. It is a staple for residential and commercial electrical panels, grounding utility equipment, and connecting lightning protection systems to the earth. Its stranded construction also makes it suitable for use as a messenger or support wire for overhead distribution.
Yes. Our 4 AWG bare copper is Soft Drawn (Annealed). Soft-drawn copper is much more flexible and easier to work with than "Hard Drawn" copper. This makes it significantly easier for electricians to bend around corners, route through tight spaces, and secure to grounding rods or bus bars without the wire "springing" back.
Yes. This wire is Direct Burial Rated. Bare copper is naturally resistant to corrosion from soil and moisture. It is the industry standard for creating a "Grounding Electrode Loop" or connecting a service panel to a copper-clad ground rod driven into the soil.
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.
Our 4 AWG Bare Copper is manufactured to meet rigorous industry standards, including:
The nominal outside diameter (OD) of a 4 AWG stranded bare copper wire is approximately 0.232 inches.
Wire America ships from our 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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