TABLE - 58
(FOR INSTALLATION IN DUCT ONLY) RATING FACTORS FOR VARIATION IN THERMAL RESISTIVITY OF SOIL FOR THREE SINGLE-CORE CABLES IN DUCTS
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
1.11
1.08
1.06
1.04
1.0
0.94
0.87
0.82
0.77
0.73
0.69
70
1.12
1.09
1.06
1.04
1.0
0.94
0.87
0.81
0.76
0.72
0.68
95
1.12
1.09
1.06
1.04
1.0
0.94
0.87
0.81
0.76
0.72
0.68
120
1.13
1.10
1.07
1.04
1.0
0.94
0.86
0.80
0.75
0.72
0.67
150
1.13
1.10
1.07
1.04
1.0
0.94
0.86
0.80
0.75
0.71
0.67
185
1.13
1.10
1.07
1.04
1.0
0.93
0.86
0.79
0.75
0.70
0.67
240
1.14
1.11
1.07
1.04
1.0
0.93
0.86
0.79
0.74
0.70
0.66
300
1.14
1.11
1.08
1.05
1.0
0.93
0.85
0.79
0.74
0.69
0.65
400
1.14
1.11
1.08
1.05
1.0
0.93
0.85
0.78
0.73
0.68
0.65
500
1.15
1.11
1.08
1.05
1.0
0.93
0.85
0.78
0.73
0.68
0.64
630
1.15
1.12
1.08
1.05
1.0
0.93
0.84
0.78
0.72
0.68
0.64
800
1.16
1.12
1.09
1.05
1.0
0.93
0.84
0.77
0.72
0.67
0.64
1000
1.16
1.13
1.09
1.05
1.0
0.92
0.84
0.77
0.71
0.67
0.63
TABLE - 59
(FOR INSTALLATION IN DUCT ONLY) RATING FACTORS FOR VARIATION IN THERMAL RESISTIVITY OF SOIL FOR TWIN OR MULTI-CORE CABLES LAID IN SINGLE-WAY DUCTS
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
1.04
1.03
1.02
1.02
1.00
0.98
0.94
0.91
0.88
0.86
0.83
4
1.04
1.04
1.03
1.02
1.00
0.97
0.94
0.90
0.87
0.85
0.82
6
1.05
1.04
1.03
1.02
1.00
0.97
0.93
0.90
0.86
0.84
0.81
10
1.05
1.04
1.03
1.02
1.00
0.97
0.93
0.89
0.86
0.83
0.80
16
1.06
1.04
1.03
1.02
1.00
0.97
0.92
0.88
0.85
0.82
0.79
25
1.06
1.05
1.03
1.02
1.00
0.96
0.92
0.88
0.84
0.82
0.78
35
1.06
1.05
1.03
1.02
1.00
0.96
0.92
0.87
0.83
0.81
0.77
50
1.07
1.05
1.03
1.02
1.00
0.96
0.91
0.87
0.83
0.80
0.77
70
1.07
1.05
1.04
1.02
1.00
0.96
0.91
0.86
0.82
0.79
0.76
95
1.07
1.06
1.04
1.02
1.00
0.96
0.91
0.86
0.82
0.78
0.75
120
1.08
1.06
1.04
1.03
1.00
0.95
0.90
0.85
0.81
0.78
0.74
150
1.09
1.06
1.04
1.03
1.00
0.95
0.90
0.85
0.80
0.77
0.73
185
1.09
1.07
1.05
1.03
1.00
0.95
0.89
0.84
0.80
0.76
0.72
240
1.09
1.07
1.05
1.03
1.00
0.95
0.89
0.84
0.79
0.76
0.72
300
1.10
1.07
1.05
1.03
1.00
0.95
0.88
0.83
0.78
0.75
0.71
400
1.10
1.07
1.05
1.03
1.00
0.95
0.88
0.83
0.78
0.75
0.71
48 MKK XXS002-02/01-12-2014
Made with FlippingBook Annual report