Factors for grouping in soil single core cables in there phase systems

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Table 7
Cable Type Method of laying: ©©©     Side by side, clearance: 7cm
Load Factor   0.7 1.0
XLPE Insulated
cables
Thermal resistivity or the soil
K.m/W
0.7 1.0 1.5 2.5 0.7-2.5
Number of cables 1 0.99 1.00 1.01 1.02 0.89
  2 0.84 0.85 0.86 0.87 0.72
0,6/1 kV-20.3/35kV 3
4
0.74
0.69
0.75 0.70 0.77
0.71
0.77
0.72
0.62
0.57
5 0.65 0.66 0.67 0.67 0.53
  6 0.63 0.63 0.64 0.65 0.51
  8 0.59 0.59 0.60 0.60 0.47
PVC Insulated
cables
10 0.56 0.56 0.57 0.57 0.44
Number of cables 1
2
0.94
0.85
1.00 0.86 1.01
0.87
1.02
0.88
0.89
0.72
3 0.75 0.76 0.77 0.78 0.62
0.6/1 kV-3.5/6kV 4
5
6
0.70
0.66
0.64
0.71 0.67 0.64 0.72
0.68
0.65
0.73
0.68
0.65
0.57
0.53
0.51
8 0.59 0.60 0.61 0.61 0.74
10 0.57 0.57 0.58 0.58 0.44
Table 8    
Current Factor
for variation in depth of laying
Laying depth m Factor 0.6/1 kV to 15/30kV
0.5 1.03
0.7 1.00
1 0.96
1.2 0.93
1.5 0.91
2 0.88
2.5 0.86
Table 9

Factors for laying inducts and pipes
  Bedding and filling with tamped sand or excavated soil and covering with bricks, cement slabs or flot to silghtly curved thin plastic covering plates Factor


1.0
  Bedding and filling with sand or excavated soil and heavily curved hoods with air oculosion




Cable trough with cover, hollow space air filled pipes
0.90






0.85
 
 

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