Rating factors for current Carrying Capacities

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Rating Factors for Current Carrying Capacities
When the laying and operating conditions differ from the standard conditions stated on table 3 to table
11 current carrying capacities are to be multiplied with appropriate rating factors given in the following tables
Conversion factors for multicore cables (>5 cores)
conductors cross section from 1.5 to 10 mm2
Table 3    
Number of loaded cores Earth Air
5
7
10
14
19
24
40
61
0.70
0.60
0.50
0.45
0.40
0.35
0.30
0.25
0.75 0.65 0.55 0.50 0.45 0.40 0.35 0.30
Laying in Ground
Factors for variation in ambient temperature and termal resistivity of soil
Table 4
Type of cable Termal resistivity ofthesoil K.m/W 0.7 1.0 1.5 2.5
XLPE
Insulated cables
0.6/1 kV-20.3/35kV
Load Factor 0.7 1.0 0.7 1.0 0.7 1.0 0.7-1.0
Soil Temperature
10C
15C
20C
20C
25C
30C
35C
40C
1.16 1.14 1.12 1.05
1.14
1.00
1.05
1.02
1.00
0.98
0.95
0.98
0.95
0.93
0.90
0.88
0.95
0.92
0.90
0.87
0.84
0.82
0.91
0.89
0.86
0.84
0.81
0.78
0.86
0.84
0.81
0.78
0.75
0.72
0.68
PVC
Insulated cables
0.6/1 kV- 3.5/6kV
Soil Temperature
10C
15C
20C
25C
30C
35C
40C
1.19 1.17 1.14 1.06
1.03
1.01
1.06
1.03
1.01
0.97
0.94
0.97
0.94
0.91
0.88
0.85
0.94
0.91
0.87
0.84
0.80
0.77
0.89
0.86
0.83
0.79
0.76
0.72
0.83
0.79
0.76
0.72
0.68
0.63
0.59
 

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