Generator Grounding

[namesray]

I have a free standing Onan Cummins generator that I have installed in a shed approximately 35 feet from my house.
Can I use my well casing as the generator ground?
Do I risk destroying my well pump?
It is grounded back to the house panel but they want two ground points also my water comes in through a plastic pipe.

The ground is extremely rocky and I'm having major difficulty getting the grounding rod in any considerable depth.

Thanks!

probably a silly question/suggestion, but does your bx22 have a back hoe? or do you have access to a back hoe? you could dig a hole with a backhoe through the rock and place a ground rod in then back fill? just a quick thought i had. (you state your tractor is a bx22)

as far as grounding through your well casing, i have no idea.

 

[ducks13]

For what it is worth, I don't believe the NEC recognizes well casing as grounding electrodes unless they happen to be listed for the purpose.