"These requirements cover arc-fault circuit-interrupters (AFCIs) of the outlet branch circuit type intended for use in dwelling units. These devices are intended to mitigate the effects of arcing faults that may pose a risk of fire ignition under certain conditions if the arcing persists. These devices have a maximum rating of 20 A and are intended for use in 120-V ac@ 60-HZ circuits. These requirements are intended to be used with the Standard for Arc-Fault Circuit-Interrupters@ UL 1699@ as these requirements modify the requirements described in that standard. Unless otherwise specified@ when the term ""arc-fault circuit-interrupter"" or ""AFCI"" is used in this Outline@ it refers to an arc-fault circuit-interrupter of the outlet branch circuit type@ also known as an outlet branch circuit arc-fault circuit-interrupter (OBC AFCI)."