# How I can calculate the Power (KVA) from the meter

Home Electrical Engineering Forum General Discussion How I can calculate the Power (KVA) from the meter

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• #10482
Freeknow
Participant

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

#12087
erickench
Participant

If you're just looking to size the cable then why not use the existing overcurrent protection rating for the service? I t would either be a fused disconnect or a main circuit breaker.

#12157
Spir Georges GHALI
Participant

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.

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