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Im sure you guys have converted it, but what would you suspect would cause random trips in a gfi circuit? I went to a call the other day, customer had a gfi tripping, he replaced the gfi, but it was still tripping. I checked termination on gfi, it was good, then found a Christmas light plug with the plug facing up to collect the rainwater. So I blew the plug out, turned the plug upside down and stayed 20mins, no trip. Well customer called yesterday said it tripped again. I'm kinda stumped.
 

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If he's got a bunch of Christmas lights hooked up, he's probably got a legitimate ground fault. Could be something difficult to detect like cumulative leakage over the length of the strings.

Move the lighting to a different GFCI. If the problem follows the lighting, you've got your answer.
 
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