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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 temp
arature

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

1.12

1.08

1.04

1.00

0.96

0.91

0.87

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

0.7

1.0

1.5

2.5

Charging

Charging

Charging

Charging

°C

°C

0.50

0.60

0.70

0.85

1.00

0.50

0.60

0.70

0.85

1.00

0.50

0.60

0.70

0.85

1.00

0.50-1.00

70

5

1.29

1.26

1.22

1.15

1.09

1.13

1.11

1.08

1.04

1.00

0.99

0.98

0.97

0.95

0.93

0.86

10

1.27

1.23

1.19

1.13

1.06

1.11

1.08

1.06

1.01

0.97

0.96

0.95

0.94

0.92

0.89

0.83

15

1.25

1.21

1.17

1.10

1.03

1.08

1.06

1.03

0.99

0.94

0.93

0.92

0.91

0.88

0.86

0.79

PVC Cables

20

1.23

1.28

1.14

1.08

1.01

1.06

1.03

1.00

0.96

0.91

0.90

0.89

0.87

0.85

0.83

0.76

25

1.03

1.00

0.97

0.93

0.88

0.87

0.85

0.84

0.82

0.79

0.72

30

0.94

0.89

0.85

0.84

0.82

0.80

0.78

0.76

0.68

35

0.77

0.74

0.72

0.63

40

0.59

90

5

1.24

1.21

1.18

1.13

1.07

1.11

1.09

1.07

1.03

1.00

0.99

0.98

0.97

0.96

0.94

0.89

10

1.23

1.19

1.16

1.11

1.05

1.09

1.07

1.05

1.01

0.98

0.97

0.96

0.95

0.93

0.91

0.86

15

1.21

1.17

1.14

1.08

1.03

1.07

1.05

1.02

0.99

0.95

0.95

0.93

0.92

0.91

0.89

0.84

XLPE Cables

20

1.19

1.15

1.12

1.06

1.00

1.05

1.02

1.00

0.96

0.93

0.92

0.91

0.90

0.88

0.86

0.81

25

1.02

1.00

0.98

0.94

0.90

0.90

0.88

0.87

0.85

0.84

0.78

30

0.95

0.91

0.88

0.87

0.86

0.84

0.83

0.81

0.75

35

0.82

0.80

0.78

0.72

40

0.68

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