how did we select power wire selection?

[techsudheer]

plz help me,
how did we select power for 10kva system with out put 110ac, i heard one formule i.e vd= (2*k*I*l) /csa... plz kindly give clarify fromulae with exampl



adv thanks
sudheer

 

[chuckey]

I do not know what "vd" is or "k" or "l". From basics, your max current is 10,000/110 ~90 Amps. So you need a cable that can carry 90 A from source to load without dropping too much voltage down it. The voltage drop is normally 2.5%. This then defines the resistance of the cable R = (2.5/100) X (110/90) = .030 ohms. If you now look at the charts for cable you need to find a cable that is long enough for your needs that has a resistance equal or less then this value. Note the cable drops voltage down its live AND neutral conductors, so you need to work on .015 ohms for a single run.
Frank

 

[kak111]

Here is info for sizing cables, everything you need ............

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electrician calculators

American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies

Electrical Wire Gauge Comparison Table

 

[harryhyden]

Choosing a proper and an adequate wire or cable for any purpose is of very much importance. And if you are choosing it for the electrical purpose then it is of utmost value to give proper care and attention. Different electrical appliances require different current and voltage requirements to operate. So for different devices the cable used should also be different. Selecting the proper cable is of so much importance because it is connected with the security of your house or other buildings.

 

[techsudheer]

thanks Mr frank

 

[harryhyden]

Thanks for this information...