Freeknow said:
I have 8 meter in the 1st floor , the rate in the meter 3×127/220 and 3×220/380 also 40/160 Amper the Breaker is 150 A
Can I get the KVA from these information, and the the right size of the cable.
best regards
Dear ;
First, we can calculate the power in kVA by the following formula :
– For 3 phases network : S = 1.73 x U x I
where :
– S : Ther Power in ” VA “
– U : The voltage between 2 phases in ” Volt “
– I : The line's current in ” Amp “
About the cable, if you have a circuit breaker ” 150A ” that's means you should use a cable that can withstand in the working conditions at least 150A, so, to know the relative section, you should know the working conditions : type & kind of cable, methode installation, and the ambiant temperature, then accordingly define the correction factors, so you can do the correct choice of cable's section from the table of ” IEC 364-5-52 “.
Regards.