a) Overhead transmission system
b) Overhead traction system
c) Transformer earthing (occasionally)
| Nominal Area | No./Nominal diameter of wires |
Approximate Overall Diameter |
Nominal Mass |
Max. DC Resistance at 20°C |
Minimum Breaking Load |
Current rating (*) |
| mm2 | No./mm | mm | kg/km | ohm/km | KN | A |
| 10 | 7/1.35 | 4.05 | 89.82 | 1.82900 | 3.752 | 80 |
| 14 | 7/1.60 | 4.80 | 126.20 | 1.30300 | 5.267 | 99 |
| 16 | 3/2.65 | 5.70 | 148.30 | 1.10600 | 6.194 | 112 |
| 16 | 7/1.70 | 5.10 | 142.40 | 1.15400 | 5.946 | 106 |
| 25 | 7/2.10 | 6.30 | 217.30 | 0.75630 | 9.073 | 138 |
| 32 | 3/3.75 | 8.06 | 296.90 | 0.55200 | 12.400 | 171 |
| 32 | 7/2.46 | 7.38 | 298.20 | 0.54970 | 12.442 | 168 |
| 35 | 7/2.50 | 7.50 | 308.00 | 0.53370 | 12.860 | 171 |
| 50 | 7/3.00 | 9.00 | 443.50 | 0.37060 | 18.520 | 215 |
| 50 | 19/1.80 | 9.00 | 435.80 | 0.38190 | 17.700 | 212 |
| 70 | 7/3.55 | 10.65 | 621.10 | 0.26460 | 25.930 | 264 |
| 70 | 19/2.10 | 10.50 | 593.20 | 0.28060 | 24.090 | 256 |
| 95 | 19/2.50 | 12.50 | 840.70 | 0.19800 | 34.140 | 317 |
| 100 | 7/4.30 | 12.90 | 911.20 | 0.18100 | 36.540 | 334 |
| 120 | 19/2.80 | 14.00 | 1055.00 | 0.15780 | 42.830 | 364 |
| 125 | 19/2.90 | 14.50 | 1131.00 | 0.14710 | 45.940 | 380 |
| 150 | 19/3.20 | 16.00 | 1377.00 | 0.12080 | 55.940 | 429 |
| 150 | 37/2.25 | 15.75 | 1334.00 | 0.12640 | 53.880 | 418 |
| 185 | 19/3.55 | 17.75 | 1695.00 | 0.09815 | 68.860 | 486 |
| 185 | 37/2.50 | 17.50 | 1647.00 | 0.10240 | 66.490 | 475 |
| Size | Number / Dia. of Wire | Calculated Cross Sect. | Approx. Overall Diameter | Approx. Weight | Calculated Breaking Load | DC Resistance at 20° C | Standard Length per Reel |
| Area | Max. | ||||||
| mm² | No. / mm | mm² | mm | kg/km | kN | Ohm/km | m |
| 0.9 | 7 / 0.4 | 0.9 | 1.2 | 8 | 0.36 | 20.7 | 2,000 |
| 1.4 | 7 / 0.5 | 1.4 | 1.5 | 12 | 0.56 | 13.2 | 2,000 |
| 2 | 7 / 0.6 | 2 | 1.8 | 18 | 0.81 | 9.18 | 2,000 |
| 3.5 | 7 / 0.8 | 3.5 | 2.4 | 32 | 1.43 | 5.17 | 2,000 |
| 5.5 | 7 / 1.0 | 5.5 | 3 | 50 | 2.23 | 3.31 | 2,000 |
| 8 | 7 / 1.2 | 7.9 | 3.6 | 71 | 3.2 | 2.3 | 2,000 |
| 14 | 7 / 1.6 | 14.1 | 4.8 | 127 | 5.64 | 1.29 | 2,000 |
| 22 | 7 / 2.0 | 22 | 6 | 198 | 8.71 | 0.818 | 2,000 |
| 30 | 7 / 2.3 | 29.1 | 6.9 | 262 | 11.4 | 0.618 | 2,000 |
| 38 | 7 / 2.6 | 37.2 | 7.8 | 335 | 14.5 | 0.484 | 2,000 |
| 50 | 19 / 1.8 | 48.3 | 9 | 438 | 19.2 | 0.376 | 2,000 |
| 60 | 19 / 2.0 | 59.7 | 10 | 541 | 23.6 | 0.301 | 2,000 |
| 80 | 19 / 2.3 | 78.9 | 11.5 | 715 | 31.1 | 0.228 | 2,000 |
| 100 | 19 / 2.6 | 100.9 | 13 | 914 | 39.4 | 0.178 | 2,000 |
| 125 | 19 / 2.9 | 125.5 | 14.5 | 1,137 | 48.7 | 0.143 | 2,000 |
| 150 | 37 / 2.3 | 153.7 | 16.1 | 1,396 | 60.5 | 0.118 | 2,000 |
| 200 | 37 / 2.6 | 196.4 | 18.2 | 1,783 | 76.7 | 0.092 | 2,000 |
| 250 | 61 / 2.3 | 253.4 | 20.7 | 2,305 | 99.7 | 0.0715 | 2,000 |
| 325 | 61 / 2.6 | 323.9 | 23.4 | 2,946 | 126 | 0.056 | 1,000 |
| 400 | 61 / 2.9 | 402.9 | 26.1 | 3,665 | 156 | 0.045 | 1,000 |
| 500 | 61 / 3.2 | 490.6 | 28.8 | 4,462 | 189 | 0.37 | 1,000 |
| 600 | 91 / 2.9 | 601.1 | 31.9 | 5,478 | 233 | 0.0303 | 500 |
| 725 | 91 / 3.2 | 731.9 | 35.2 | 6,670 | 281 | 0.0248 | 500 |
| 850 | 127 / 2.9 | 838.9 | 37.7 | 7,645 | 325 | 0.0217 | 500 |
| 1000 | 127 / 3.2 | 1021.4 | 41.6 | 9,309 | 393 | 0.0179 | 300 |
| Cross Sectional Area (mm2) |
Stranding (mm) |
Nominal Conductor Diameter (mm) |
Mass (kg/km) |
Breaking Load (kN) |
Calculated DC Resistance at 20°C (Ohm/km) |
Reactance at 50Hz with 300 mm Spacing (Ohm/km) |
Current Rating Still Air (Amps) |
Current Rating 1 m/s (Amps) |
| 6 | 7/1.04 | 3.12 | 53.6 | 2.51 | 3.03 | 0.365 | 44 | 87 |
| 10 | 7/1.35 | 4.05 | 90.2 | 4.17 | 1.80 | 0.349 | 61 | 120 |
| 16 | 7/1.70 | 5.10 | 143 | 6.5 | 1.13 | 0.334 | 82 | 160 |
| 25 | 7/2.14 | 6.42 | 227 | 10.1 | 0.716 | 0.320 | 110 | 212 |
| 35 | 19/1.53 | 7.65 | 314 | 14.1 | 0.516 | 0.306 | 135 | 260 |
| 50 | 19/1.83 | 9.15 | 451 | 20.0 | 0.361 | 0.295 | 169 | 323 |
| 70 | 19/2.14 | 10.7 | 617 | 26.8 | 0.264 | 0.285 | 206 | 392 |
| 95 | 37/1.83 | 12.8 | 882 | 39.0 | 0.186 | 0.273 | 256 | 486 |
