Current rating of Cables: Current rating of Cables given below are based on IEC 60287 calculation and these values can be followed for the cables as per BS/IEC standard.
TABLE - 41
CURRENT RATINGS & VOLTAGE DROP OF THE CABLES - 600/1000 V Single Core Copper, XLPE insulated Armoured/Unarmoured Cables.
In Air
In Ground
I n Duct
"Approx Voltage drop of 3 Single core cables (3 Phase System)
Area
Single Core in Trefoil
Single Core in Trefoil
Single Core in Trefoil
Unarmoured Armoured
Armoured
Armoured
Trefoil
mm²
A
A
A
A
V/A/km
1.5
22
--
--
--
26.73
2.5
30
--
--
--
16.37
4
39
--
--
--
10.19
6
49
--
--
--
6.81
10
67
67
82
78
4.04
16
92
92
108
101
2.56
25
123
123
139
134
1.62
35
146
146
165
154
1.18
50
174
180
199
199
0.878
70
222
230
244
239
0.620
95
275
282
292
281
0.463
120
321
328
332
315
0.379
150
371
377
371
341
0.326
185
430
433
417
376
0.276
240
513
510
480
421
0.235
300
594
581
536
459
0.212
400
692
664
594
488
0.192
500
801
751
658
529
0.179
630
925
846
723
571
0.168
800
1051
919
764
595
0.162
1000
1172
997
810
632
0.157
Operating Conditions Ambient air temp.
50 °C 35 °C
Ground temp. Depth of Laying
0.50 m
Thermal resistivity of Soil
1.2 K.m/W
34 MKK XXS002-02/01-12-2014
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