Insulated Ground 680.25

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I am being told that my sub-panel which is feeding a pool panel "must" have an insulated ground feeding it (the sub-panel). I have an insulated ground from the sub-panel to the pool panel which is what 680.25 states.......

680.25 (B) Grounding:

An equipment grounding conductor shall be installed with the feeder conductors between the grounding terminal of the pool equipment panelboard (which in my case is the pool panel) and the grounding terminal of the applicable service equipment (which in my case is the sub-panel) or source of a separately derived system?.this equipment grounding conductor shall be insulated.


Any thoughts on why I am being told that the sub-panel must be fed with an insulated ground?
 
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