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Old 05-02-2013, 02:27 PM   #11
Facinerous
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I do not know specificaly why a gfi will trip when it has another gfi on its load or monitered side. It does have something to do with the monitering equipment, which involves a cti. I did a quick google search and could not find the reason why, but I did find a lot of people posing gfi trip questions with this setup being the culprit.
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Old 05-02-2013, 02:36 PM   #12
ajdelange
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Modern GFCI's not only monitor the 60 Hz current balance. They also launch a 120Hz signal and monitor that. I'm guessing that with two sources of 120 Hz on the same circuit there could be a problem but I haven't done any analysis that would explain why.

 
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