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What is the difference between a parallel arc fault and a series arc?

A parallel arc fault is any fault from line to neutral, line to line, or line to ground. A series arc is an arc due to a loose connection or separated wire. The magnitude of a series arc is limited by the impedance of the load, and will usually be limited to less than the circuits rating, whereas a parallel arc may be as high as the short-circuit availability for the circuit.


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