70mm² Copper cable current?

[ZeleC]

hello
Pleaese need help in finding the recommended ampacity of a 70mm² copper cable at 20-30 oC
thx

 

[IanP]

Wire current handling capacity values
A/mm2    R/mohm/m        I/A
6         3.0             55
10        1.8             76
16        1.1             105
25        0.73            140
35        0.52            173
50        0.38            205
70        0.27            265

Information about 35 mm2 Cu wire
According Ströberg TTT 35mm2 copper wire can take continuous current of 170A on free air and 200 A on ground. The wire can handle 5 kA short circuit current for 1s. DC resistance of the wiure is 0.52mohm/m.

Quoted from:
"Copper wire figures"
http://www.epanorama.net/documents/wiring/wire_resistance.html

So, 70mm² copper wire can take continous current of 265A in air at 30°C ..
For different temperatures here you will find correction factors:
**broken link removed**

Regards,
IanP