What is the difference in calculating size of AC cables compared to calculating size of DC Cables? Usually DC Cables are larger than AC Cables although they have the same ampacity. Why is it?

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What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.

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HOW TO CALCULATE THE LOSSES OF CURRENT FOR LT CABLE JOINTING TO MOTOR SUPPLY.

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we have one ups its neutral is not earthed.its one distribution MCB has a earth fault.but we can not put off any MCB.so how to find out that in which circuit is earthed without isolating the breaker.

3 Answers   CFCL,

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Befor synchronissation of Generator what test to be carried out.pl.specify with reason.

3 Answers   Kanoria,

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What are the different circuits in thermal power plant?

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what is the contact resistance of Air circuit breaker??

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What is meant by class of CT&PT?

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Explain working of servo controlled voltage stabilizer.

3 Answers  

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Purpose of lighting transformer.

2 Answers  

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In three pin socket normally three pin in between three pins earthing point is more thickness why?

6 Answers  

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what is unbalanced rotating magnetic field?

1 Answers  

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