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Correction Factors
Thermal resistivity of earth
Thermal resistivity of earth K.m/W
Earth Conditionsý
Air Conditions
0.7
Very Humid
Continuous Humid
1
Humid
Regular Rainy
2
Dry
Rarely Rainy
3
Very Dry
Seldom Rainy or Dry
Correction Factors for Their Temparature Depending on ºC
Insulation Type
Permissable Operating temparature
Permissable operating Temparature rise
Correction Factors for their air temparature dependin on °C
°C
K
10
15
20
25
30
35
40
45
50
PVC
70
-
1.22
1.17
1.12
1.07
1.00
0.94
0.87
0.79
0.71
XLPE
90
1.15
1.08
1.04
0.96
0.91
0.82
Soil temperature in different environments were exposed to all
Correction factors for cables
Permissible Operating Temp.
Temparature ofEarth
Specific Thermal Resistivity of earth K.m/w
1.0
1.5
2.5
Charging
0.50
0.60
0.70
0.85
0.50-1.00
5
1.29
1.26
1.09
1.13
1.11
0.99
0.98
0.97
0.95
0.93
0.86
1.27
1.23
1.19
1.06
1.01
0.92
0.89
0.83
1.25
1.21
1.10
1.03
0.88
PVC Cables
1.28
1.14
0.90
0.76
0.84
0.72
0.80
0.78
0.68
0.77
0.74
0.63
0.59
1.24
1.18
1.16
1.05
1.02
XLPE Cables
0.81
0.75
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