Vacuum cleaners with the speed controlled beater brushes in the head, these always seem to trip it when adjusting around low speed.
**While you are at it please find out why (at least 90's and early 2000's Ford 7.3)diesel truck block heaters trip GFCI's. I have never been able to get this question answered, even by the companies that make them.Per code the outlet being outside is required to be GFCI but it will not hold overnight when it should/needs be connected. Mike W July 17 2013, 8:20 am EDT
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