Bus Bar Sizing Calculation

Is this homework or a class assignment?

#class assignment# Kindly give the proper reply of my question

Sometimes when a question is asked, some of the information is extra. In the question you have given, I believe that one of the items is extra. Can you determine which one it is?

If you watch the units (such as Amps, meters, hours, or others) and write them down with the numbers as you try to solve a problem, you can make sure that the numbers get written in the right places because the unwanted units will cancel each other out. Two of your items in the question have units which, when combined in the way so the unwanted unit cancels out, will give the minimum bus size.

One of the items in your question first seems to be suggesting the amount of bracing the bus will need to withstand the magnetic forces of a fault condition. Then I realized that it was also telling you how much energy the bus had to absorb without getting too hot to melt any insulation or melt itself. To use this, you would need to know how to convert the values given into energy dissipated within the bus bar and then how to convert this to temperature rise. You should be able to do this with the knowledge you already have.

I think this is all I should do to answer your question. Not because I can't answer it, but because you need to work it out to the best of your own ability. That is the way to learn. If you post your work and guesses, then I can help you think through anything missing.

--JMM

How can I able to calculate the Bus Bar (Aluminium) size of A MCC/PCC with the following data that are available

1) Full load current i,e, incomer ACB rating say 1250 A

2) Fault lavel , say 50 KA for 1 sec

3) rated voltage 415 V , 50Hz, 3 Phase , 4 Wire

4) Current density say 0.8 A/ sq. mm

Kindly give me the calculation with all respect

this is simple you have all the data for the calculation.

area of Al bus bar=Current/Current density of Al

=800A/0.8A/m2

= 1000m2