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if we know Fault level say 25 KA , How to decide
busbar size for Distribution network of 1000 Amp
Breaker ?
Sample Calculation or Farmula Available or not ?

Answer Posted / mehul g. c.

if you know the fault level of that area.

then you should find short circuit current.
if you find that then your busbar should be design for that
much short circuit current.

suppose your fault level is 25 ka & then your short circuit
current is 1500 amp. then your busbar should stand safe at
25 ka for 1 or 2 sec until your breaker tripped.

Is This Answer Correct ?    6 Yes 3 No



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