AFCIs (was Re: OT: GFCIs (was New DEC museum entry :D))

[der Mouse]

> The "bedroom GFCI"s that Ethan mentioned are actually Arc-fault
> interrrupters, [...]

How, exactly, does an arc-fault interrupter work?  What characteristics
of arcs do they detect, and how?  I poked around a little, but didn't
find anything that described how they worked.  (Only what - no how.)

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