Tinned conductors
|
Cross section |
cl.2 |
cl.5 |
Cross section |
cl.2 |
cl.5 |
|
mm² |
Ohm/km |
Ohm/km |
mm² |
Ohm/km |
Ohm/km |
|
1.0 |
18.2 |
20 |
70 |
0.270 |
0.277 |
|
1.5 |
12.2 |
13.7 |
95 |
0.195 |
0.210 |
|
2.5 |
7.56 |
8.21 |
120 |
0.154 |
0.164 |
|
4 |
4.70 |
5.09 |
150 |
0.126 |
0.132 |
|
6 |
3.11 |
3.39 |
185 |
0.100 |
0.108 |
|
10 |
1.84 |
1.95 |
240 |
0.0762 |
0.0817 |
|
16 |
1.16 |
1.24 |
300 |
0.0607 |
0.0654 |
|
25 |
0.734 |
0.795 |
400 |
0.0475 |
0.0495 |
|
35 |
0.529 |
0.565 |
500 |
0.0369 |
0.0391 |
|
50 |
0.391 |
0.393 |
630 |
0.0286 |
0.0292 |
Plain conductors
|
Cross section |
cl.2 |
cl.5 |
Cross section |
cl.2 |
cl.5 |
|
mm² |
Ohm/km |
Ohm/km |
mm² |
Ohm/km |
Ohm/km |
|
1 |
18.1 |
19.5 |
70 |
0.268 |
0.272 |
|
1.5 |
12.1 |
13.3 |
95 |
0.193 |
0.206 |
|
2.5 |
7.41 |
7.98 |
120 |
0.153 |
0.161 |
|
4 |
4.61 |
4.95 |
150 |
0.124 |
0.129 |
|
6 |
3.08 |
3.30 |
185 |
0.0991 |
0.106 |
|
10 |
1.83 |
1.91 |
240 |
0.0754 |
0.0801 |
|
16 |
1.15 |
1.21 |
300 |
0.0601 |
0.0641 |
|
25 |
0.727 |
0.780 |
400 |
0.0470 |
0.0486 |
|
35 |
0.524 |
0.554 |
500 |
0.0366 |
0.0384 |
|
50 |
0.387 |
0.386 |
630 |
0.0283 |
0.0287 |
Correction factors according to IEC 60228
IEC 60228 standard provides electrical resistance of copper conductors at an ambient temperature of 20°C.
For other temperatures, correction factors are applied as below:
|
Temperature (°C) |
Kt |
|
5 |
1.064 |
|
10 |
1.042 |
|
15 |
1.020 |
|
20 |
1.000 |
|
25 |
0.980 |
|
30 |
0.962 |
|
35 |
0.943 |
|
40 |
0.926 |
|
45 |
0.909 |
|
50 |
0.893 |
|
55 |
0.877 |
|
60 |
0.862 |
|
65 |
0.847 |
|
70 |
0.833 |
|
75 |
0.820 |
|
80 |
0.806 |
|
85 |
0.794 |
|
90 |
0.781 |
|
95 |
0.769 |
|
100 |
0.758 |
