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· Function over Form
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Turning a switch off will NOT protect from a lightning strike. Remember, the household grade switch is at most rated for 600 volts (more likely 240 volts). Lighting voltage is exponentially higher, as you know. The voltage will arc across the switch as if it was turned on.

It is best to unplug. Removal from wiring area is the absolute best, as near strikes will also damage electronic equipment.
 
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