TABLE - 56
(FOR INSTALLATION IN GROUND ONLY) RATING FACTORS FOR VARIATION IN THERMAL RESISTIVITY OF SOIL FOR TWO OR THREE SINGLE-CORE CABLES LAID DIRECT IN THE GROUND
Nominal Area of
Thermal Resistivity of Soil in K.m/W
Conductor mm²
0.7
0.8
0.9
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
Up to 50
1.21
1.16
1.11
1.07
1.0
0.91
0.81
0.73
0.68
0.63
0.59
70
1.22
1.16
1.12
1.07
1.0
0.91
0.81
0.73
0.68
0.63
0.59
95
1.22
1.16
1.12
1.07
1.0
0.91
0.81
0.73
0.68
0.63
0.59
120
1.22
1.16
1.12
1.07
1.0
0.91
0.81
0.73
0.68
0.63
0.59
150
1.22
1.16
1.12
1.07
1.0
0.91
0.81
0.73
0.68
0.63
0.59
185
1.22
1.17
1.12
1.07
1.0
0.91
0.81
0.73
0.68
0.62
0.59
240
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.73
0.68
0.62
0.59
300
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.73
0.68
0.62
0.59
400
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.73
0.67
0.62
0.58
500
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.73
0.67
0.62
0.58
630
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.73
0.67
0.61
0.58
800
1.23
1.17
1.12
1.07
1.0
0.91
0.80
0.72
0.66
0.61
0.58
1000
1.24
1.18
1.12
1.07
1.0
0.91
0.80
0.72
0.66
0.61
0.58
TABLE - 57
(FOR INSTALLATION IN GROUND ONLY) RATING FACTORS FOR VARIATION IN THERMAL RESISTIVITY OF SOIL FOR TWIN OR MULTI CORE CABLES LAID DIRECT IN THE GROUND
Nominal Area of
Thermal Resistivity of Soil in K.m/W
Conductor mm²
0.7
0.8
0.9
1.0
1.2
1.5
2.0
2.5
3.0
3.5
4.0
1.5/2.5
1.12
1.09
1.07
1.04
1.0
0.94
0.86
0.80
0.75
0.70
0.66
4
1.13
1.10
1.07
1.05
1.0
0.94
0.85
0.79
0.74
0.69
0.65
6
1.14
1.10
1.07
1.05
1.0
0.93
0.85
0.79
0.74
0.68
0.64
10
1.15
1.11
1.08
1.05
1.0
0.93
0.85
0.78
0.73
0.67
0.63
16
1.16
1.12
1.08
1.05
1.0
0.93
0.84
0.77
0.72
0.66
0.62
25
1.17
1.13
1.09
1.05
1.0
0.93
0.83
0.77
0.71
0.65
0.61
35
1.17
1.13
1.09
1.06
1.0
0.92
0.83
0.76
0.71
0.65
0.61
50
1.17
1.13
1.09
1.06
1.0
0.92
0.83
0.76
0.71
0.65
0.61
70
1.18
1.14
1.09
1.06
1.0
0.92
0.83
0.75
0.70
0.64
0.60
95
1.18
1.14
1.09
1.06
1.0
0.92
0.83
0.75
0.70
0.64
0.60
120
1.19
1.14
1.10
1.06
1.0
0.92
0.82
0.75
0.69
0.64
0.60
150
1.19
1.14
1.10
1.06
1.0
0.92
0.82
0.75
0.69
0.63
0.59
185
1.19
1.14
1.10
1.06
1.0
0.92
0.82
0.74
0.69
0.63
0.59
240
1.20
1.15
1.10
1.07
1.0
0.92
0.81
0.74
0.69
0.63
0.59
300
1.20
1.15
1.10
1.07
1.0
0.92
0.81
0.74
0.69
0.63
0.59
400
1.20
1.15
1.10
1.07
1.0
0.92
0.81
0.74
0.69
0.63
0.59
47 MKK XXS002-02/01-12-2014
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