Copper Conductor Construction Table 1
Maximum conductor resistance (d.c.) at 20 0 C per km for Plain Annealed copper conductor (in ohm / km)
Minimum number of wires
Nominal diameter of conductor (mm)
Nominal Conductor Area (mm 2 )
1.0
1*
1.13
18.1
1.5
7
1.59
12.1
1.5
1*
1.38
12.1
2.5
1*
1.78
7.41
2.5
7
2.01
7.41
4
7
2.52
4.61
6
7
3.12
3.08
10
7
4.00
1.83
16
6
4.80
1.15
25
6
5.90
0.727
35
6
6.90
0.524
50
6
8.10
0.387
70
12
9.70
0.268
95
15
11.40
0.193
120
18
12.90
0.153
150
18
14.30
0.124
185
30
16.00
0.0991
240
34
18.40
0.0754
300
34
20.60
0.0601
400
53
23.30
0.047
500
53
26.30
0.0366
630
53
30.00
0.0283
800
53
34.14
0.0221
1000
53
38.20
0.0176
* Solid Conductor
Note: Plain annealed copper conductor class 1 solid or class 2 stranded circular compacted or non- compacted as per BS EN 60228.
6 MKXXS001-04/01-08-2015
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