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PVC Covered Conductors (BS 648- China Suppliers & Factory for Overhead Power Line 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 (FAQ)
Q: What does the "Code Word" represent in the table?
The Code Words (such as Midge, Aphis, and Beetle) are standard industry identifiers used to easily specify and order particular sizes and configurations of conductors without confusion.
Q: How does the nominal cross-sectional area affect the electrical resistance?
Generally, there is an inverse relationship: as the nominal cross-sectional area increases (e.g., from 22 mm² to 750 mm²), the maximum resistance per kilometer at 20 °C decreases (from 1.227 Ω down to 0.03627 Ω). This allows larger conductors to carry higher currents with less power loss.
Q: What is the difference between bare and covered conductor diameters?
The covered conductor diameter includes the thickness of the Type 8 protective covering. For example, the "Midge" conductor has a bare overall diameter of 6.18 mm, which increases to 8.2 mm when covered.
Q: Which conductor offers the highest breaking load in this specification?
The "Tarantula" conductor offers the highest approximate breaking load at 120.1 kN, making it suitable for applications requiring high mechanical strength and long span lengths.
Q: What does the stranding notation (e.g., 7/2.06) mean?
The stranding notation indicates the construction of the conductor. The first number represents the number of individual wires (e.g., 7 wires), and the second number represents the diameter of each individual wire in millimeters (e.g., 2.06 mm).