Answer / rajender mohan

The Busbar Rating specifies the maximum short circuit current it can see and operate, so you can put a breaker up to breaking capacity of busbar,
Ambience temprature has to taken into consideration while designing the LT Panel.

Answer / opselvaraj

Not neceesary but it is preferable to have the same rating
from operation/maintenance point of view.

Answer / anil jangra

KA rating of any switchgear is depending on fault level of connecting load,so it necessary to calculate the fault current of load than select the switchgear rating,as per my opinion the must be able to clear the fault without damaging it self and healty one feeder also.

Answer / pravin deshbhratar

yes, whatever fault current rating that we are maintaining
for the Incomer breaker same has to be maintained for
outgoing breaker also unless there is a stepdown
transformer in line. Because the fault level is calculated
on the basis of actual load of the substation that it is
going to carry out, so it is suggested that we have to use
the same KA ratiing for Incomer as well as the Outgoing
breaker.

Answer / mohammad farman khan

Not Necessary,depend upon your system means you are going
to use same KA rating for reactive power or normal power.if
you are using for reactive power then you hava to have same
KA rating of BB.however, you can check for normal load.

Answer / r.gunasekaran

Circuit breaker KA rating should be more than that bus bar
KA.

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