Group Rating Factors single core cables
Group rating factors for circuits of three single core cables in Trefoil and laid flat touching, horizontal formation (average value)
| |
Number
Of
Circuits |
 |
| Spacing of Circuits |
| Touching |
| |
|
Trefoil |
Laid flat |
0.15m* |
0.30m |
0.45m |
0.60m |
| |
2 |
0.78 |
0.81 |
0.81 |
0.85 |
0.88 |
0.90 |
| |
3 |
0.66 |
0.68 |
0.71 |
0.76 |
0.80 |
0.83 |
| 12/20kV |
4 |
0.59 |
0.62 |
0.65 |
0.72 |
0.76 |
0.80 |
| |
5 |
0.55 |
0.58 |
0.61 |
0.68 |
0.73 |
0.77 |
| |
6 |
0.52 |
0.55 |
0.58 |
0.66 |
0.72 |
0.76 |
| |
| |
2 |
0.79 |
0.81 |
0.81 |
0.85 |
0.88 |
0.90 |
| 18/30kV |
3 |
0.67 |
0.70 |
0.71 |
0.76 |
0.80 |
0.83 |
| |
4 |
0.62 |
0.65 |
0.65 |
0.72 |
0.76 |
0.80 |
| |
5 |
0.57 |
0.60 |
0.60 |
0.68 |
0.73 |
0.77 |
| |
6 |
0.54 |
0.57 |
0.57 |
0.66 |
0.72 |
0.76 |
*This configuration, at 0.15m spacing, may not be practical for the larger size cables