Factor Table 10, trefoil groups

Calculation factor according to German Standard VDE 0276-1000 (1999), Table 10, single cables, applicable to single-core cables in air grouped in trefoils with spacing of two cable diameters between the groups.

Symbol
$F_{T10_{3}}$
Unit
p.u.
Choices
arrangement
 
layers
 
groups
1
23
on the surface10.980.960.94
tray without holes10.980.960.94
20.950.910.87
30.940.90.85
40.9370.8940.84
50.9340.8870.83
60.930.880.82
tray with holes11.00.980.96
20.970.930.89
30.960.920.85
40.9570.9140.844
50.9540.9070.837
60.950.90.83
horizontal ladder11.01.01.0
20.970.950.93
30.960.940.9
40.9570.9370.89
50.9540.9340.88
60.950.930.87
vertical supports10.940.910.89
20.940.90.86