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How we get electric shock from a non grounded, isolated, computer UPS output hot terminal, placed on well insulated wooden board and its input wires disconnected from building mains?

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How we get electric shock from a non grounded, isolated, computer UPS output hot terminal, placed on well insulated wooden board and its input wires disconnected from building mains?	1
How to test different painted gi pipe, purpose is to identify the cheap quality painted pipe from the costlier painted one used for installation works?	1