Re: sizing load ,cable& breaker

Spir Georges GHALI

Dear Mr. Ally ;


Certainly you can.

Please find below another important points :

– The ” Loop Impedance “ for a fault at any point in the network should be calculated from the source to this point, that means : MV, Tr, and all cables till the point of fault.

– If the used Earthing System is different than ” TN-C “, in this case, we should calculate ” Isc1min  &  If ” specialy if the ” N  &  PE ” have different sections that means ” Isc1min If “.

– If you use ” IT  system ” : it's better to define first the ” Fault's Loop ” then calculate the Loop Impedance, as there's many method to realize the ” IT “.


I's at your disposal for any inquiry.