Final answer:
Arc Fault Circuit Interrupter (AFCI) devices protect against parallel arcing and series arcing.
Step-by-step explanation:
Arc Fault Circuit Interrupter (AFCI) devices protect against two types of arcing, namely parallel arcing and series arcing. Parallel arcing occurs when electricity jumps from one conductor to another, such as from a hot wire to a neutral or ground wire. Series arcing, on the other hand, happens when electricity jumps across gaps in a single conductor, such as a loose or deteriorated wire.