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 standards.
TABLE - 47
CURRENT RATINGS & VOLTAGE DROP OF THE CABLES - 600/1000 V Single Core Copper, PVC 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
16
--
--
--
25.10
2.5
22
--
--
--
15.40
4
29
--
--
--
9.60
6
36
--
--
--
6.40
10
49
49
68
64
3.80
16
67
67
89
84
2.40
25
90
90
115
111
1.50
35
107
107
136
127
1.10
50
123
129
162
159
0.828
70
156
163
198
193
0.587
95
194
200
238
226
0.442
120
226
232
270
249
0.365
150
260
265
301
274
0.314
185
302
303
338
300
0.268
240
360
356
388
335
0.229
300
415
407
434
367
0.206
400
484
462
480
391
0.191
500
557
520
528
418
0.178
630
641
582
577
450
0.166
800
726
628
605
470
0.161
1000
808
677
638
497
0.156
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
40 MKK XXS002-02/01-12-2014
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