Table A5

Correction lectors for different installation depths in ground

Depth of laying, m

0.50-0.70

0.71-0,90

0.91-1 -10

1,11-І-30

1.31*1,50

1 kV cables

1.00

097

0 95

0.93

0.92



Table Аб
Correction factors for different thermal resistivities cl sol

Thermal resistivity of son К m/W

0.7

1.0

1.2

1.5

2.0

2.5

3*0

Correction factor

1*10

1*00

0.92

0.85

0.75

0*69

0.63



Examples of thermal resistivities of soil: - dry sand (moisture content 0%) 3.0 К m/W - eemi dry and moist gravel 1,0 К m/W

* dry gravel end dev 1,5 К m/W * moist day and sand (moisture

semrdry gravel and sand (moisture content 25% 0.7 К m/W

content 10%) 1*2 К m/W

Table A7

Correction factors for different ground temperatures

CorAictor temperature

round temperahrv* *C



0

5

10

10

20

2B

30

30

40

70

1.17

1.13

1.09

1.04

1*00

О.ЄБ

oeo

0 45

o,ao

0.73

0 07

66

1. IB

1,14

1.10

1,00

1.00

О.ЭБ

□ o

0,64

0l77

0.71

О.63



For paraKei ducts with one multi-core cable or a group of three skigH-core cables in each and with the cables equally loaded, the correction factors in table A8 are used. If correction factors in Table AB are used, then the factors In Table A4 are not used.

Table AS

Correction factors for cables In unified plastic tubes

I Mutual spacing between the tubes, mm

Number of tubes beside each other |

1

2

3

4

5

6

8

10 I

0 (touching)

0.80

0.75

0.65

0.60

0.60

0*55

0,55

0*50

70


0*75

0*70

0.65

0.65

0.60

0 60

0,55

250


0.75

0*70

0.70

0.70

0.65

065

06=1

2.2 Correction factor* ineir hstalatlon

Table A9

Correction factors for different ambient air temperatures

Conductor tempemxe

AmtMnt tevnperauee. ’C

*C

to

15

20

25

30

35

<0

<5

50

55

70

1.18

1Л2

1.05

too

0.93

oee

0.76

0.71

0 62

0.62

65

1.20

1Л4

1.0?

1.00

0.93

0,85

0.77

0.68

0.67

0Л5

Table A10

Correction Factors for Groups of muhicore cables laid in air

This applies only when rhe cable temperature does not affect the ambient ar temperature


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