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This question may be asking if it is safe to plug things into mains wall sockets if they have been left switched on with nothing plugged-in, and if it is safer to plug things in only after the sockets have been switched off? If, and only if, that is the meaning of this question, the answer is probably:

It should not be dangerous to plug something into a switched-on socket but it is always a good idea - and safer - to switch off any socket before you plug anything into it.

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The hazard is not in the plugging-in, but may arise from the appliance itself, if it starts unexpectedly.

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9y ago

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