Quote:
Originally Posted by PeterM
... from the above could I then assume that if I disconnected everything in the observatory to do with the scope but left an appliance ie dvd/player a fan? still connected in the observatory this might act as the sacrificial cow to give a connection to earth?
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Might. Or might even connect the surge through those other disconnected devices. Or might do nothing. First the argument is subjective. Second, do you really know what is and is not conductive? That was another major point. A home, for example, is just filled with materials that are discovered later to be conductive. That is why the only effective solution (short of literally carefully constructing a completely electrically isolated building inside the building) demands doing everything necessary to earth a surge BEFORE entering the building.
It is so much easier, so effective, and so much less expensive to simply upgrade the earthing system. As noted in the beginning, surge protection is always about where energy dissipates.