On Wednesday, March 14, 2018 at 1:44:28 AM UTC-4, wrote:

GFCIs are far from failsafe. Well worth having but not entirely reliable by any means, and not failsafe.


Nothing is fail-safe other than a low-voltage, battery-operated system. Anything that includes a primary source whether isolated or not, whether on a GFCI device, or not - there could be a way for primary power to migrate to the secondary side and/or jump the GFCI device. One may reduce the odds of failure via redundancy, or by other means. Or, one may take ordinary common-sense precautions in the full understanding that nothing is perfect.

Kinda-sorta like spending one's life living under a rock, or taking the ordinary risks of daily life and enjoy what life one is allotted under such terrible threats.

Peter Wieck
Melrose Park, PA