DC Resistance

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Typical DC resistances for copper and aluminium conductors operating at 20oC are based on values given in AS/NZS 1125.1.

Background information can be found in the calculation of DC resistances article.

Size ([math]mm^{2}[/math]) Maximum DC Resistance ([math]\Omega[/math]\km) at 20oC
Copper Aluminium
Stranded Conductors Solid Conductors Stranded Conductors Solid Conductors
Plain Silver Tinned Nickel Silver Tinned Nickel
0.5 38.4 38.4 39.6 36 36.7 39.6 - -
0.75 25.3 25.3 26 24.5 24.8 19.7 - -
1 21.2 21.2 21.6 23.3 18.1 18.2 13.2 - -
1.5 13.6 13.6 13.8 14.9 12.1 12.2 - - -
2.5 7.41 7.41 7.56 8.14 7.41 7.56 - - 12.1
4 4.61 4.61 4.7 5.06 4.61 4.7 - 7.41 7.54
6 3.08 3.08 3.11 3.34 3.08 3.11 - 4.61 5.01
10 1.83 1.83 1.84 2 1.83 1.84 - 3.08 3.08
16 1.15 1.15 1.16 - 1.15 1.16 - 1.91 1.91
25 0.727 0.727 0.734 - 0.727 - - 1.2 1.2
35 0.524 0.524 0.529 - - - - 0.868 0.868
50 0.387 0.387 0.391 - - - - 0.641 0.641
70 0.268 0.268 0.27 - - - - 0.443 0.443
95 0.193 0.193 0.195 - - - - 0.32 0.32
120 0.153 0.153 0.154 - - - - 0.253 0.253
150 0.124 0.124 0.126 - - - - 0.206 0.206
185 0.0991 0.0991 0.1 - - - - 0.164 0.164
240 0.0754 0.0754 0.0762 - - - - 0.125 0.125
300 0.0601 0.0601 0.0607 - - - - 0.1 0.1
400 0.047 0.047 0.0475 - - - - 0.0778 -
500 (1) 0.0366 / 0.037332 0.0366 / 0.037332 0.0369 / 0.037638 - - - - 0.0605 / 0.06171 -
630 (1) 0.0283 / 0.028866 0.0283 / 0.028866 0.0286 / 0.029172 - - - - 0.0469 / 0.047838 -

Note (1): resistance values are quoted for single core / multicore cables

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