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PVC Covered Conductor (BS 648- China Factory Suppliers for Overhead Power Transmission Solutions
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| Code Word | Nominal cross-sectional area | Stranding and Wire Diameter | Approximate Overall Diameter of Bare Conductor | Maximum Resistance per kilometre at 20 °C | Approximate Breaking Load | Approximate Overall Diameter of Covered Conductor | Approximate Mass per kilometre of Covered Conductor |
|---|---|---|---|---|---|---|---|
| Type 8 | Type 8 | ||||||
| mm² | mm | mm | Ω | kN | mm | kg/km | |
| Midge | 22 | 7/2.06 | 6.18 | 1.227 | 3.99 | 8.2 | 100 |
| Aphis | 25 | 3/3.35 | 7.2 | 1.081 | 4.11 | 9.2 | 133 |
| Gnat | 25 | 7/2.21 | 6.63 | 1.066 | 4.59 | 8.8 | 118 |
| Weevil | 30 | 3/3.66 | 7.9 | 0.9082 | 4.86 | 10.1 | 158 |
| Mosquito | 35 | 7/2.59 | 7.77 | 0.7762 | 6.03 | 10 | 156 |
| Ladybird | 40 | 7/2.79 | 8.37 | 0.6689 | 6.87 | 10.6 | 177 |
| Ant | 50 | 7/3.10 | 9.3 | 0.5419 | 8.28 | 11.7 | 200 |
| Fly | 60 | 7/3.40 | 10.2 | 0.4505 | 9.9 | 12.4 | 249 |
| Bluebottle | 70 | 7/3.66 | 11 | 0.3881 | 11.34 | 13.2 | 285 |
| Earwing | 75 | 7/3.78 | 11.3 | 0.3644 | 11.94 | 13.6 | 302 |
| Grasshopper | 80 | 7/3.91 | 11.7 | 0.3406 | 12.78 | 13.9 | 319 |
| Clegg | 90 | 7/4.17 | 12.5 | 0.2994 | 14.53 | 14.7 | 359 |
| Wasp | 100 | 7/4.39 | 13.17 | 0.2702 | 16 | 16 | 360 |
| Beetle | 100 | 19/2.67 | 13.4 | 0.2704 | 17.42 | 15.6 | 387 |
| Bee | 125 | 7/4.90 | 14.7 | 0.2169 | 19.94 | 16.9 | 482 |
| Cricket | 150 | 7/5.36 | 16.1 | 0.1813 | 23.85 | 18.3 | 567 |
| Hornet | 150 | 19/3.25 | 16.3 | 0.1825 | 27.7 | 18.5 | 538 |
| Caterpillar | 175 | 19/3.53 | 17.7 | 0.1547 | 28.63 | 19.9 | 646 |
| Chafer | 200 | 19/3.78 | 18.9 | 0.1349 | 32.4 | 21.7 | 690 |
| Spider | 225 | 19/3.99 | 20 | 0.1211 | 36.01 | 22.2 | 809 |
| Cockroach | 250 | 19/4.22 | 21.1 | 0.1083 | 40.4 | 23.3 | 900 |
| Butterfly | 300 | 19/4.65 | 23.3 | 0.08916 | 48.7 | 25.5 | 1082 |
| Moth | 350 | 19/5.00 | 25 | 0.07711 | 56.37 | 27.2 | 1241 |
| Drone | 350 | 37/3.58 | 25.1 | 0.07741 | 57.45 | 27.3 | 1222 |
| Locust | 400 | 19/5.36 | 26.8 | 0.0671 | 64.73 | 29 | 1416 |
| Centipede | 400 | 37/3.78 | 26.5 | 0.06944 | 63.1 | 28.7 | 1353 |
| Maybug | 450 | 37/4.09 | 28.6 | 0.05931 | 74.01 | 30.8 | 1573 |
| Scorpion | 500 | 37/4.27 | 29.9 | 0.05441 | 79.98 | 32.1 | 1706 |
| Cicada | 600 | 37/4.65 | 32.6 | 0.04588 | 94.95 | 34.8 | 2010 |
| Tarantula | 750 | 37/5.23 | 36.6 | 0.03627 | 120.1 | 38.8 | 2519 |
Frequently Asked Questions
What are the main applications of these covered conductors?
Covered conductors, such as Midge, Gnat, and Wasp, are primarily designed for overhead distribution lines. The Type 8 covering provides temporary protection against short circuits caused by accidental contact with tree branches, birds, or other foreign objects, significantly improving grid reliability.
What does "Type 8" covering specify?
Type 8 refers to a specific thickness and material standard for the covering insulation (typically XLPE or HDPE). It is engineered to withstand environmental stresses and mechanical wear while providing sufficient electrical insulation for overhead line configurations.
Why do these conductors have unique code words like "Midge" or "Beetle"?
These standard code words (often based on insect names for specific conductor types) are widely used in the international cable industry to simplify ordering, planning, and referencing technical specifications without having to use long strings of technical numbers.
How does stranding affect the electrical and mechanical performance?
The stranding configuration (e.g., 7/2.06 vs 19/2.67) directly impacts the overall flexibility, tensile strength (breaking load), and ease of installation. More strands generally offer better flexibility, making the conductor easier to handle during installation in complex terrains.
Why is the maximum DC resistance measured specifically at 20 °C?
20 °C is the industry standard reference temperature for measuring electrical resistance. Because the resistance of aluminum and copper changes with temperature, establishing a fixed reference point allows for accurate comparison and calculation of line losses.
How do I choose the correct nominal cross-sectional area for my project?
Choosing the right size depends on the expected current load, maximum allowable voltage drop, span length, and local environmental conditions (such as wind and ice loading). Reference the breaking load and nominal area columns in the table to match your engineering requirements.