Answer / renish2905

Becuse of the fault current is very large and small time about 1 second or friction of second.in this time CB is activated nearly less than of second.and all about calcualtion to took fault current time 1sec for easy to calculation.

Answer / asivasankar2k

As per my view, All equipment made to withstand 1sec only

Answer / adnan

Fault current is too large, about 7 times the normal current. If this current flows for longer time, it will burn all the equipments. So, breakers are designed to operate in 0.3 sec, 0.5 sec time if fault is not cleared in this time.
So such large current, even 1 sec is too long time.

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