What is the difference between series and parallel arcing as it pertains to combination Arc-fault Circuit Interrupters?

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What is the difference between series and parallel arcing as it pertains to combination arc fault circuit breakers?

Product Line:
Circuit Breakers
Arc Fault
QO and Homeline

Environment:
Electrical Distribution Equipment

Resolution:
Series protection detects arcing across a break in the hot or neutral conductor.
Parallel protection detects arcing between the hot and neutral or ground, or the neutral and ground.