Bare Copper Conductor (ASTM B3/B8)
Applications
Solid and stranded (classes AA and A) bare copper are suitable for overhead transmission and distribution applications.
Stranded conductor of greater flexibility (classes B and C) are suitable for uninsulated hook up, jumpers, and grounds in electrical construction. Soft Drawn copper is unilay construction.
   Â

Specifications
B-1 Hard-Drawn Copper Wire.
B-2 Medium-Hard Copper Wire.
B-3 Soft or Annealed Copper Wire.
B-8 Concentric-Lay-Stranded Hard, Medium-Hard or Soft Copper Conductor.
B-33 Tinned Conductors
B-787 19 Wire Combination Unilay-Stranded Soft copper wire.
Construction
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.
Size | Section | Number of Wires | Wire Diameter | Total Diameter | Resistance DC @ 20°C | Minimun Elongation in 10 In. Wire before Stranding (254 mm) | Total Weight | |
AWG / MCM | Cmil | mm² |  | mm | mm | Ω/ km | % | kg / km |
22 | 640 | 0.324 | 7 | 0.243 | 0.73 | 54.2 | 15 | 2.97 |
20 | 1,020 | 0.517 | 7 | 0.307 | 0.92 | 34.0 | 20 | 4.69 |
18 | 1,620 | 0.821 | 7 | 0.386 | 1.16 | 21.4 | 20 | 7.46 |
16 | 2,580 | 1.307 | 7 | 0.488 | 1.46 | 13.5 | 20 | 11.87 |
14 | 4,110 | 2.083 | 7 | 0.615 | 1.85 | 8.44 | 25 | 18.87 |
12 | 6,530 | 3.309 | 7 | 0.776 | 2.33 | 5.31 | 25 | 30.00 |
10 | 10,380 | 5.26 | 7 | 0.978 | 2.93 | 3.34 | 25 | 47.72 |
8 | 15,510 | 7.859 | 7 | 1.20 | 3.59 | 2.24 | 25 | 75.86 |
6 | 26,240 | 13.3 | 7 | 1.56 | 4.67 | 1.32 | 25 | 121 |
4 | 41,740 | 21.15 | 7 | 1.96 | 5.88 | 0.831 | 25 | 192 |
2 | 66,360 | 33.62 | 7 | 2.47 | 7.42 | 0.523 | 25 | 305 |
1 | 83,690 | 42.41 | 19 | 1.69 | 8.43 | 0.415 | 25 | 385 |
1/0 | 105,600 | 53.49 | 19 | 1.89 | 9.47 | 0.329 | 25 | 485 |
2/0 | 133,100 | 67.43 | 19 | 2.13 | 10.6 | 0.261 | 25 | 611 |
3/0 | 167,800 | 85.0 | 19 | 2.39 | 11.9 | 0.207 | 25 | 771 |
4/0 | 211,600 | 107.2 | 19 | 2.68 | 13.4 | 0.164 | 30 | 972 |
250 | 250,000 | 127 | 37 | 2.09 | 14.6 | 0.138 | 25 | 1,149 |
300 | 300,000 | 152 | 37 | 2.29 | 16.0 | 0.116 | 25 | 1,379 |
350 | 350,000 | 177 | 37 | 2.47 | 17.3 | 0.0994 | 25 | 1,609 |
400 | 400,000 | 203 | 37 | 2.64 | 18.5 | 0.0866 | 30 | 1,838 |
500 | 500,000 | 253 | 37 | 2.95 | 20.7 | 0.0695 | 30 | 2,298 |
600 | 600,000 | 304 | 61 | 2.52 | 22.7 | 0.0578 | 25 | 2,758 |
700 | 700,000 | 355 | 61 | 2.72 | 24.5 | 0.0495 | 30 | 3,216 |
750 | 750,000 | 380 | 61 | 2.82 | 25.3 | 0.0463 | 30 | 3,447 |
800 | 800,000 | 405 | 61 | 2.91 | 26.2 | 0.0434 | 30 | 3,676 |
900 | 900,000 | 456 | 61 | 3.09 | 27.8 | 0.0386 | 30 | 4,136 |
1,000 | 1,000,000 | 507 | 61 | 3.25 | 29.3 | 0.0347 | 30 | 4,596 |
Bare Copper Conductor (ASTM B3/B8)
Applications
Solid and stranded (classes AA and A) bare copper are suitable for overhead transmission and distribution applications.
Stranded conductor of greater flexibility (classes B and C) are suitable for uninsulated hook up, jumpers, and grounds in electrical construction. Soft Drawn copper is unilay construction.
   Â

Specifications
B-1 Hard-Drawn Copper Wire.
B-2 Medium-Hard Copper Wire.
B-3 Soft or Annealed Copper Wire.
B-8 Concentric-Lay-Stranded Hard, Medium-Hard or Soft Copper Conductor.
B-33 Tinned Conductors
B-787 19 Wire Combination Unilay-Stranded Soft copper wire.
Construction
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.
Size | Section | Number of Wires | Wire Diameter | Total Diameter | Resistance DC @ 20°C | Minimun Elongation in 10 In. Wire before Stranding (254 mm) | Total Weight | |
AWG / MCM | Cmil | mm² |  | mm | mm | Ω/ km | % | kg / km |
22 | 640 | 0.324 | 7 | 0.243 | 0.73 | 54.2 | 15 | 2.97 |
20 | 1,020 | 0.517 | 7 | 0.307 | 0.92 | 34.0 | 20 | 4.69 |
18 | 1,620 | 0.821 | 7 | 0.386 | 1.16 | 21.4 | 20 | 7.46 |
16 | 2,580 | 1.307 | 7 | 0.488 | 1.46 | 13.5 | 20 | 11.87 |
14 | 4,110 | 2.083 | 7 | 0.615 | 1.85 | 8.44 | 25 | 18.87 |
12 | 6,530 | 3.309 | 7 | 0.776 | 2.33 | 5.31 | 25 | 30.00 |
10 | 10,380 | 5.26 | 7 | 0.978 | 2.93 | 3.34 | 25 | 47.72 |
8 | 15,510 | 7.859 | 7 | 1.20 | 3.59 | 2.24 | 25 | 75.86 |
6 | 26,240 | 13.3 | 7 | 1.56 | 4.67 | 1.32 | 25 | 121 |
4 | 41,740 | 21.15 | 7 | 1.96 | 5.88 | 0.831 | 25 | 192 |
2 | 66,360 | 33.62 | 7 | 2.47 | 7.42 | 0.523 | 25 | 305 |
1 | 83,690 | 42.41 | 19 | 1.69 | 8.43 | 0.415 | 25 | 385 |
1/0 | 105,600 | 53.49 | 19 | 1.89 | 9.47 | 0.329 | 25 | 485 |
2/0 | 133,100 | 67.43 | 19 | 2.13 | 10.6 | 0.261 | 25 | 611 |
3/0 | 167,800 | 85.0 | 19 | 2.39 | 11.9 | 0.207 | 25 | 771 |
4/0 | 211,600 | 107.2 | 19 | 2.68 | 13.4 | 0.164 | 30 | 972 |
250 | 250,000 | 127 | 37 | 2.09 | 14.6 | 0.138 | 25 | 1,149 |
300 | 300,000 | 152 | 37 | 2.29 | 16.0 | 0.116 | 25 | 1,379 |
350 | 350,000 | 177 | 37 | 2.47 | 17.3 | 0.0994 | 25 | 1,609 |
400 | 400,000 | 203 | 37 | 2.64 | 18.5 | 0.0866 | 30 | 1,838 |
500 | 500,000 | 253 | 37 | 2.95 | 20.7 | 0.0695 | 30 | 2,298 |
600 | 600,000 | 304 | 61 | 2.52 | 22.7 | 0.0578 | 25 | 2,758 |
700 | 700,000 | 355 | 61 | 2.72 | 24.5 | 0.0495 | 30 | 3,216 |
750 | 750,000 | 380 | 61 | 2.82 | 25.3 | 0.0463 | 30 | 3,447 |
800 | 800,000 | 405 | 61 | 2.91 | 26.2 | 0.0434 | 30 | 3,676 |
900 | 900,000 | 456 | 61 | 3.09 | 27.8 | 0.0386 | 30 | 4,136 |
1,000 | 1,000,000 | 507 | 61 | 3.25 | 29.3 | 0.0347 | 30 | 4,596 |
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