TABLE 9
TREEFOIL TOUCHING FORMATION DERATING FACTORS FOR THREE SINGLE CORE CABLES LAID IN FREE AIR.

Clearance = 2 (d)

Clearance from the wall ≥ 2cm
Number of troughs
1
2
3
0.95
0.90
0.88
Laid on the Floor
Number of troughs   
Laid cables                     1
troughs                          2
(circulation of air           3
is restricted)                  6
0.95
0.90
0.88
0.86
0.90
0.85
0.83
0.81
0.88
0.83
0.81
0.79

Number of troughs    

      

                                          1
Laid                                   2
on cable racks                   3
                                          6
1.00
1.00
1.00
1.00
0.98
0.95
0.94
0.93
0.96
0.93
0.92
0.90
Arrangements
for which reduction
of the current
is not necessry

TABLE 10
HORIZONTAL OR VERTICAL FORMATION DERATING FACTORS FOR FREE AIR.

Clearance =Cable dimeter (d)

Clearance from the wall ≥ 2cm
Number of troughs
1
2
3
6
9
0.95
0.90
0.88
0.85
0.84
Laid on the Floor
Number of troughs   
Laid cables                     1
troughs                          2
(circulation of air           3
is restricred)                   6
0.95
0.90
0.88
0.86
0.90
0.85
0.83
0.81
0.88
0.83
0.81
0.79
0.85
0.81
0.79
0.77
0.84
0.80
0.78
0.76

Number of troughs   

                                         1
Laid                                   2
on cable racks                  3
                                         6
1.00 1.00
1.00
1.00
0.98
0.94
0.94
0.93
0.96
0.93
0.92
0.90
0.93
0.90
0.89
0.87
0.92
0.89
0.88
0.86
Arranged near the wall
1.00
0.93
0.90
0.87
0.86
Arrangements
for which reduction
of the current
is not necessry
Clearance
from the
wall
≥ 2 cm
Clearance
from the
cablesl
≥ 2 d
Continue ...