GFCI used with a grounding probe?

[Russellaqua]

Is it useful to have a ground probe on a tank when literally all of the equipment on the tank is connected to a GFCI? The circuit should trip within a few hundredths of a second upon a drop of about 5 mA. Does this really make the grounding probe pointless or is it just good to have around as a second line of defense against electrocution?

 

[Dave3112]

In my opinion grounding probes are useless any way.......on any kind of circuit

 

[MBG75]

Not all equip used in tanks have a grounded plug (3prong). So if that particular item leaks current then the GFI won't necessarily trip without the probe