Bare Copper Conductor
Bare Copper Conductor for Overhead Transmission Lines
Bare Copper Conductors are used widely in:
Overhead transmission and distribution lines (solid or stranded AA & A hard-drawn tempers)
Uninsulated hook-up and jumper wires
Grounding and bonding systems
Electrical building construction
Busbar jumpers and earth systems
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Product Description
Bare Copper Conductor : Product Description and Specifications
JOCA’s Bare Copper Conductors are engineered for high-efficiency electrical grounding and power transmission. Available in both solid and stranded configurations, these conductors are manufactured from high-purity copper to ensure maximum conductivity and long-term corrosion resistance. We provide various tempers—including hard-drawn, medium-hard, and annealed (soft)—to meet the specific flexibility and tensile requirements of your project. Whether deployed in overhead grids, grounding systems, or uninsulated hook-ups, our copper conductors strictly adhere to ASTM benchmarks for consistent field performance.
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Advantages
Bare Copper Conductor : Benefits and Features
Maximum Ampacity: High-purity copper ensures the lowest resistance for grounding and transmission.
Application-Specific Tempers: Hard-drawn, medium-hard, or annealed states to match site flexibility and tension.
Overhead Strength: Hard-drawn options provide the structural integrity required for distribution lines.
Installation Ease: Class B/C stranding offers the bend radius needed for complex grounding grids.
Natural Durability: Inherently resists atmospheric corrosion without additional coatings or treatments.
Standard Compliance: Fully verified against ASTM specs for dimensional accuracy and field reliability.
Specification Of Bare Copper Conductor
| Category | Standard ID | Description |
|---|---|---|
| Specifications | B-1 | Hard-Drawn Copper Wire. |
| Specifications | B-2 | Medium-Hard Copper Wire. |
| Specifications | B-3 | Soft or Annealed Copper Wire. |
| Specifications | B-787 | 19 Wire Combination Unilay-Stranded Soft copper wire. |
| Specifications | B-8 | Concentric-Lay-Stranded Hard, Medium-Hard or Soft Copper Conductor |
| Specifications | ASTM B-33 | Tinned Soft or Annealed Copper for Electrical Purposes |
| Construction | N/A | Bare copper, solid or stranded. Available in tempers hard, medium-hard, or soft. Stranded conductors are concentrically stranded in hard and medium-hard tempers and are Combination Unilay stranded in the soft-drawn temper |
Dimensions/Parameters
| Size (AWG) | Stranding | Stranding Class | Weight (lbs/1000 ft) | Individual Wires Diameter (mils) | Complete Conductor Diameter (mils) | Hard Drawn Rated Strength (lbs) | Hard Drawn DC Resistance (ohms/1000 ft) @20°C | Medium-Hard Drawn Rated Strength (lbs) | Medium-Hard Drawn DC Resistance (ohms/1000f) @20°C | Soft-Drawn Rated Strength (lbs) | Soft-Drawn DC Resistance (ohms/1000 ft) @20°C | Allowable Ampacity+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8 | 7 | B | 51 | 49 | 146 | 777 | 0.6663 | 610 | 0.6629 | 499 | 0.6408 | 95 |
| 6 | 7 | B | 81 | 61 | 184 | 1228 | 0.4191 | 959 | 0.4169 | 794 | 0.4030 | 130 |
| 4 | 7 | A, B | 128.9 | 77 | 232 | 1938 | 0.2636 | 1505 | 0.2622 | 1320 | 0.2534 | 170 |
| 3 | 7 | A, B | 162.5 | 87 | 260 | 2433 | 0.2090 | 1885 | 0.2079 | 1670 | 0.2010 | 200 |
| 2 | 7 | A, B | 204.9 | 97 | 292 | 3050 | 0.1660 | 2360 | 0.1650 | 2110 | 0.1578 | 230 |
| 1 | 7 | A | 258.4 | 109 | 328 | 3801 | 0.1316 | 2955 | 0.1309 | 2552 | 0.1252 | 265 |
| 1/0 | 7 | A, AA | 326.1 | 123 | 368 | 4752 | 0.1042 | 3705 | 0.1037 | 3221 | 0.1002 | 310 |
| 2/0 | 7 | A, AA | 410.9 | 138 | 414 | 5926 | 0.08267 | 4640 | 0.08224 | 4062 | 0.07949 | 355 |
| 2/0 | 19 | B | 410.9 | 84 | 418 | 6690 | 0.08267 | 4765 | 0.08224 | 4024 | 0.07949 | 355 |
| 3/0 | 7 | A, AA | 518.1 | 155 | 464 | 7366 | 0.06556 | 5812 | 0.06522 | 5118 | 0.06304 | 410 |
| 4/0 | 7 | A, AA | 653.3 | 174 | 522 | 9154 | 0.05199 | 7278 | 0.05172 | 6459 | 0.04999 | 480 |
| 4/0 | 19 | B | 653.3 | 106 | 528 | 9617 | 0.05199 | 7479 | 0.05172 | 6453 | 0.04999 | 480 |
| 250 | 19 | A | 771.9 | 115 | 574 | 11360 | 0.04400 | 8836 | 0.04378 | 7627 | 0.04231 | 530 |
| 250 | 37 | B | 771.9 | 82 | 575 | 11600 | 0.04400 | 8952 | 0.04378 | 7940 | 0.04231 | 530 |
| 300 | 19 | A | 926.2 | 126 | 628 | 13510 | 0.03667 | 10530 | 0.03648 | 9160 | 0.03526 | 590 |
| 350 | 19 | A | 1080.6 | 136 | 679 | 15590 | 0.03143 | 12200 | 0.03127 | 10680 | 0.03022 | 650 |
| 500 | 37 | A, B | 1543.8 | 116 | 814 | 22510 | 0.02200 | 17550 | 0.02189 | 15240 | 0.02116 | 810 |
| 600 | 37 | A, AA | 1852.5 | 127 | 891 | 27020 | 0.01834 | 21060 | 0.01825 | 18300 | 0.01763 | 910 |
| 750 | 61 | A, B | 2315.6 | 111 | 998 | 34090 | 0.01467 | 26510 | 0.01459 | 22890 | 0.01410 | 1040 |
| 1000 | 61 | A, B | 3087.5 | 128 | 1152 | 45030 | 0.01100 | 35100 | 0.01094 | 30500 | 0.01058 | 1240 |
| Size (AWG) | Weight (lbs/1000 ft) | Diameter (mils) | Circular Mil Area (mils) | Hard Drawn Rated Strength (lbs) | Hard Drawn DC Resistance (ohms/1000 ft) @20°C | Medium-Hard Drawn Rated Strength (lbs) | Medium-Hard Drawn DC Resistance (ohms/1000 ft) @20°C | Soft-Drawn Rated Strength (lbs) | Soft-Drawn DC Resistance (ohms/1000 ft) @20C | Allowable Ampacity+ |
|---|---|---|---|---|---|---|---|---|---|---|
| 14 | 12.4 | 64.1 | 4110 | 213.5 | 2.626 | 166.6 | 2.613 | 124.2 | 2.525 | - |
| 13 | 15.7 | 72 | 5180 | 268.0 | 2.083 | 208.8 | 2.072 | 156.6 | 2.003 | - |
| 12 | 19.8 | 80.8 | 6530 | 336.9 | 1.652 | 261.2 | 1.643 | 197.5 | 1.588 | - |
| 11 | 24.9 | 90.7 | 8230 | 422.9 | 1.310 | 327.6 | 1.303 | 249.0 | 1.260 | - |
| 10 | 31.4 | 101.9 | 10380 | 529.2 | 1.039 | 410.4 | 1.033 | 314.0 | 0.999 | - |
| 9 | 39.6 | 114.4 | 13090 | 661.2 | 0.824 | 514.2 | 0.820 | 380.5 | 0.792 | - |
| 8 | 50 | 128.5 | 16510 | 826.0 | 0.653 | 643.9 | 0.650 | 479.8 | 0.628 | 95 |
| 7 | 63 | 144.3 | 20820 | 1030.0 | 0.518 | 806.6 | 0.515 | 605.0 | 0.498 | 105 |
| 6 | 79.4 | 162 | 26240 | 1280.0 | 0.411 | 1010.0 | 0.409 | 762.9 | 0.395 | 125 |
| 5 | 100.2 | 181.9 | 33090 | 1591.0 | 0.326 | 1265.0 | 0.324 | 961.9 | 0.313 | 145 |
| 4 | 126.3 | 204.3 | 41740 | 1970.0 | 0.258 | 1584.0 | 0.257 | 1213.0 | 0.249 | 170 |
| 3 | 159.3 | 229.4 | 52620 | 2439.0 | 0.205 | 1984.0 | 0.204 | 1530.0 | 0.197 | 195 |
| 2 | 200.9 | 257.6 | 66360 | 3003.0 | 0.163 | 2450.0 | .162 | 1929.0 | .156 | 225 |
| 1 | 253.3 | 289.3 | 83690 | 3688.0 | 0.129 | 3024.0 | 0.128 | 2432.0 | 0.124 | 260 |
| Category | USAWCPart # | Size AWG or kcmil | No. of Strands | Nom. Diam. Inches | Copper Weight lbs/ 1000 ft |
|---|---|---|---|---|---|
| Solid Tinned | 8-01SOLSDTC | 8 | Solid | 0.1285 | 50 |
| Solid Tinned | 6-01SOLSDTC | 6 | Solid | 0.1620 | 79 |
| Solid Tinned | 4-01SOLSDTC | 4 | Solid | 0.2043 | 126 |
| Solid Tinned | 2-01SOLSDTC | 2 | Solid | 0.2576 | 201 |
| Stranded Tinned | 8-01STRSDTC | 8 | 7 | 0.146 | 51 |
| Stranded Tinned | 6-01STRSDTC | 6 | 7 | 0.184 | 81 |
| Stranded Tinned | 4-01STRSDTC | 4 | 7 | 0.232 | 129 |
| Stranded Tinned | 2-01STRSDTC | 2 | 7 | 0.292 | 205 |
| Stranded Tinned | 1/0-01STRSDTC | 1/0 | 19 | 0.373 | 326 |
| Stranded Tinned | 2/0-01STRSDTC | 2/0 | 19 | 0.419 | 411 |
| Stranded Tinned | 3/0-01STRSDTC | 3/0 | 19 | 0.470 | 518 |
| Stranded Tinned | 4/0-01STRSDTC | 4/0 | 19 | 0.528 | 653 |
| Stranded Tinned | 250-01STRSDTC | 250 | 37 | 0.575 | 772 |
| Stranded Tinned | 350-01STRSDTC | 350 | 37 | 0.681 | 1081 |
| Stranded Tinned | 500-01STRSDTC | 500 | 37 | 0.813 | 1544 |
| Class A Stranded – Bare | 1/0-01STRSDBCCA | 1/0 | 7 | 0.368 | 326 |
| Class A Stranded – Bare | 2/0-01STRSDBCCA | 2/0 | 7 | 0.414 | 411 |
| Class A Stranded – Bare | 3/0-01STRSDBCCA | 3/0 | 7 | 0.464 | 518 |
| Class A Stranded – Bare | 4/0-01STRSDBCCA | 4/0 | 7 | 0.522 | 653 |
| Class A Stranded – Bare | 250-01STRSDBCCA | 250 | 19 | 0.574 | 772 |
| Class A Stranded – Bare | 350-01STRSDBCCA | 350 | 19 | 0.679 | 1081 |
| Class A Stranded – Bare | 500-01STRSDBCCA | 500 | 37 | 0.813 | 1544 |
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Production Processes Of Overhead Bare Conductors
JOCA operates a digitalized production line specifically for manufacturing overhead bare conductors. The process flow starts with raw aluminum rod inspection, moving through high-speed wire drawing and precision stranding within a single, data-tracked environment. To prevent defects, we’ve integrated intelligent sensors that monitor the diameter and surface smoothness of every conductor layer in real-time. This automated setup utilizes laser measurement technology to enforce strict adherence to ASTM, IEC, and BS standards. By removing manual variability, the system ensures that every reel of AAC, AAAC, or ACSR maintains consistent tensile strength and stable electrical performance, even under extreme environmental exposure.
Packing For Shipment
To meet various transportation needs, there are many methods of packaging that can be used.
Have more questions?
Q: Hard-drawn vs. Annealed (Soft): Which temper fits my project?
A: It depends on mechanical load. Hard-drawn copper is the “stiff” version, built for the physical tension of overhead spans. Annealed copper is processed for maximum flexibility, making it the standard for grounding grids and building wire where bending is required.
Q: How does bare copper handle outdoor exposure?
A: Copper is naturally resilient. It develops a protective patina over time that prevents deep oxidation, making it one of the most reliable materials for buried grounding and outdoor transmission networks.
Q: When is tinned copper worth the extra cost?
A: We recommend tinned copper for marine or industrial sites. The tin layer prevents the copper from reacting with high humidity or chemical fumes, which is critical for long-term conductivity in extreme environments.
Q: Which stranding classes offer the best flexibility?
A: For applications like jumpers or substation bonding, Class B and Class C stranding are the industry go-to. They offer a smaller bend radius and easier handling than solid or standard Class A conductors.
Q: Is uninsulated copper safe for all grounding applications?
A: Yes, for bonding and earthing, the lack of insulation is intentional to allow direct contact with the soil or ground connectors. Insulation is only necessary when the conductor is used as a live circuit wire.
Q: What is the benefit of Combination Unilay stranding?
A: It’s a precision stranding technique. It reduces the overall cable diameter while keeping the same copper volume, which helps with installation in tight conduits or with standard lugs.
Q: Why is bare copper the standard for lightning protection?
A: Its high ampacity and thermal conductivity are unmatched. In a strike or fault event, copper can handle massive current surges without melting or compromising the grounding grid’s integrity.
Q: How can I request technical data or a bulk price list?
A: Please reach out via our “Inquiry” page or contact our sales engineering team directly. We can provide full ASTM compliance certificates and volume-based pricing for your infrastructure projects.