440roadrunner said: (quoted from post at 11:50:59 01/11/10)
I believe the main reasons these were introduced is because of things like electric blankets. They are SUPPOSED to sense an arcing condition. I have no idea how they do that---but as an amateur radio operator I can tell you that one of the two that were installed in my house was a constant nuisance due to RF.
I'm guessing that even something as simple as a poor switch in a table lamp could cause them to trip. All I've found with Google is words like "they contain a computer chip" or "advanced electronics." I assume they look for noise on top of a "normal" 120V sine wave.
One of several conditions that will trip them is a series of 3 to 8 half-cycle currents exceeding 50amps within 1/2 second period. There are also varying currents to neutral, to ground, etc. that will trip them. As with GFIs, all current that goes thru the hot line MUST return thru the associated neutral, not via some other neutral (no shared neutrals). They are not just for blankets. Bad wiring, loose connections, etc.
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