Which fault condition represents the highest magnitude due to near-zero impedance?

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Multiple Choice

Which fault condition represents the highest magnitude due to near-zero impedance?

Explanation:
The key idea is that fault current scales with how small the fault impedance is. If the fault path has essentially zero impedance, the current is only limited by the source’s own impedance, producing the largest short-circuit current the system can supply. A bolted fault is exactly that: a direct, near-zero-impedance connection between conductors. That’s why it yields the highest magnitude. In comparison, an open circuit blocks current almost entirely, a ground fault has some impedance through the earth, and an arc fault, while capable of large currents, has a nonzero impedance due to the arc itself, so it doesn’t reach the bolted fault’s magnitude.

The key idea is that fault current scales with how small the fault impedance is. If the fault path has essentially zero impedance, the current is only limited by the source’s own impedance, producing the largest short-circuit current the system can supply. A bolted fault is exactly that: a direct, near-zero-impedance connection between conductors. That’s why it yields the highest magnitude. In comparison, an open circuit blocks current almost entirely, a ground fault has some impedance through the earth, and an arc fault, while capable of large currents, has a nonzero impedance due to the arc itself, so it doesn’t reach the bolted fault’s magnitude.

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