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1) bus bar rating should be same or below rating to incoming breaker.but this is very important that fault current clearing capacity of CB should be below or same to BUS bar
2) yes u can have 4 nos 1200Amp. o/g CBs what is more then incoming or collective CB capacity but it is depend on lot of factors
second question of second para, is possible but depend on bus bar load study and other vital cases
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