Why might a design require selective coordination between an upstream feeder breaker and a downstream branch breaker?
Correct Answer
D) To have the downstream device clear a fault without unnecessarily opening upstream equipment
Selective coordination arranges protective devices so the device nearest the fault clears it when possible, limiting unnecessary outage area. Other choices invert the purpose or confuse coordination with unrelated equipment ratings.
Why This Is the Correct Answer
Selective coordination arranges protective devices so the device nearest the fault clears it when possible, limiting unnecessary outage area. Other choices invert the purpose or confuse coordination with unrelated equipment ratings.
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