CONDUCTOR DC RESISTANCE

Normal Cross-Sectional Area mm2 Maximum Resistance of Conductor @20ºC
Plain Copper
Ω/km
Tinned Copper
Ω/km
0.5 39.0 40.1
0.75 26.0 26.7
1 19.5 20.0
1.5 13.3 13.7
2.5 7.98 8.21
4 4.95 5.09
6 3.30 3.39
10 1.91 1.95
16 1.21 1.24
25 0.78 0.795
35 0.554 0.565
50 0.386 0.393
70 0.272 0.277
95 0.206 0.210
120 0.161 0.164
150 0.129 0.132
185 0.106 0.108
240 0.0801 0.0817
300 0.0641 0.0654
400 0.0486 0.0495
500 0.0384 0.0391
630 0.0287 0.0292
Ambient Temp ºC Correction Factor
20 1.000
25 1.020
30 1.039
35 1.059
40 1.079
45 1.098
50 1.118
55 1.138
60 1.157
65 1.177
70 1.196
75 1.216
80 1.236
85 1.235
90 1.275

NOTE To calculate the DC Resistance of copper conductors for a given temperature (ºC), the resistance factor at 20ºC, as detailed must be multiplied by the appropriate correction factor above.

Firstflex has taken every precaution to ensure accurate information in this catalogue but accept no liability for any errors or omissions. Firstflex reserves the right to modify specifications at any time.