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Mike,
Nothing confusing.
Equipment should not leak voltage/current. Adding a ground probe helps to move that current away from the tank. Adding the GFCI keep the current from flowing and instead trip when a leak is detected.
Rule of thumb:
DON'T RUN A GROUND PROBE WITHOUT A GFCI.
YOU MAY RUN A GFCI WITHOUT A GROUND PROBE. Doing so will offer a fair amount of protection but does not cover all fault scenarios.
Bean
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