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OOOOOHHHHHH!!! I think most electricians know about ground currents and i am one of them.
Ground currents are mostly low after 20Mtr depending on the moist in the soil.
As you know, current will follow the path of least resistance and will not go into a insulated cable.
Good practice is as always to unplug any equipment from the power point when there is a thunder storm.
PS: if you put another earth stake at the obs power you might induce a ground loop.
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