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Quite simple. Destructive surges are hundreds of thousands of joules. The only UPS that addresses your problem will state in its spec numbers how many hundreds of thousands of joules it can absorb. Be extremely cautious. Many will recommend a UPS only rated at hundreds of joules. Near zero...

Answer starts with what was taught in elementary school science. Lightning is an electrical current the flows from the cloud, through air, (through a wooden church steeple,) to earthborne charges miles away. Wood is an electrical conductor. But not a very good conductor. So it creates a voltage...