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Westoms post makes one very relevant statement. That is "Protection is always about where energy dissipates. No plug-in protector provides protection. Will not claim protection. Cannot dissipate a typically destructive surge. Is a ‘profit center’ because so many foolishly spend tens or 100 times more money on those ineffective devices."
To follow a considered safe installation as detailed by the company listed above would add thousands of dollars to the cost of an observatory installation. This may be appropriate for a commercial installation it is overkill for a domestic installation. In most cases a good serge protector provides some protection but the best and cheapest method is just to pull the plug.. Physical isolation is the only proven method of eradicating surge or ground current risks. House contents insurance should cover the rest of the risk.
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