Cable selection

[sathanasiou]

I need to supply a three-phase transformer that has a peak/starting power of 7kVA. Voltage supply im my country is 230V. If my calculations are correct, the starting current on each phase is 8.2A and I selected a 5*2.5mmm2 cable with a 3*10A fuse. Will that be ok? Thanks!

 

[curlis19]

What u doing bro:
It is a 3 Ph transformer
that means =Sqrt(3)* V*I= 7000 VA
now I(Line)=17.59 A
and check the electrical code rules, if it is in a conduit or open , for this much current carrying capacity what cable size do u need and u need a fuse of a capacity of 25 % higher capacity.
got it.
Let me know if still problem exists.

 

[abbas2005]

curlis19 calculation is corect if 230V is the line-to-line voltage. But if 230V is the phase voltage, line-to-line voltage will be 400V and the current (I) will be 10.1A i.e. 7000/(sqrt(3)/400).