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a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose
highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in
kA. (Note: Covert 3-phase power in terms of kA to find answer.)
b)Using the below, determine the required minimum making
capacity in kA as a “peak value”.
Rate breaking capacity (Icn) ka:
Icn<= 1.5 Factor = 1.41
1.5
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