GFCI "Burn Out" Cause?

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juanoito

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Colorado
Another question: With GFCI's installed on temporary power boxes, what would be the main cause for these to "burn out?" I am thinking that a typical 20A overcurrent protection device with typical interrupting rating is not as sensetive as the GFCI electrical component, therefore, when you have multiple power cords with drill motors, circular saws, tile saws, "chop boxes" and other high inrush current devices/appliances, these stress the GFCI but not enough to trip breaker?

My superiors through my apprenticeship explained that the cause was "back - to - back" GFCI's, but I'm not sure how this works according to sound electrical theory.

Thanks!
 
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