Answer Posted / m.saad

Calclate the load Current
I = p/((root3)*V*P.F )
where I line current, v line voltage
then go to cable tabe
and check the Drateing factors.such as
if this cable underground,free,soil,depth of laying,
ambient temperture, armoed or unarmoed etc.

then calcute the voltage drop
if more than 4%
you should to select the next bigger cross section at table.

by experince for copper PVC cables
1mm take 2.5 AMP

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