The cable conductor(copper core) DC resistance
The calculation formula of DC resistance every 1 km of wire and cable:
 
DC resistance resistance coefficient every 1 km = resistance coefficient × 1000 ÷ cross-sectional area (mm2).Ω/ 1000 meters
 
The resistance coefficient: when the temperature is T=20℃, the resistance coefficient of copper is 0.0175 Ω.mm2/M.
 
The resistance coefficient of aluminum is 0.0283 Ω.mm2/M.
 
Where the temperature is T=75℃, the resistance coefficient of copper is 0.0217 Ω.mm2/M
 
The resistance coefficient of aluminum is 0.0346 Ω.mm2/M
 
Nominal cross section of conductor Largest dc resistance of conductor (Ω/km)
mm2
  Cu Al
1.5 12.1 -
2.5 7.41 -
4 4.61 7.41
6 3.08 4.61
10 1.83 3.08
16 1.15 1.91
25 0.727 1.20
35 0.524 0.0868
50 0.387 0.641
70 0.268 0.443
95 0.193 0.320
120 0.153 0.253
150 0.124 0.206
185 0.0991 0.164
240 0.0754 0.125
300 0.0601 0.100
400 0.0474 0.0778
500 0.0366 0.0605


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