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OK - so install a separate earth ground copper rod at the observatory but only attach all the grounds, boxes, etc.

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I wouldn't, Mike.
There is still the possibility of differing ground potentials and the havoc that they can cause. ---- I believe that you would be better off wiring your observatory according to code

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The best bet is to check the code for your location. Here in the county I live in, the grounding rod is requiered for an outbuilding that has electrical service to it.

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Carl

My lousy skies at Hawkeye Observatory

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