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Out of curiosity, what electrical devices do you have that don't have switches on them?

Car-player, Rio Receiver, Karma, Carbon... the only Rio product I can think of with a real mains power switch is the Rio Central. ATX PCs tend not to have power switches, too (though some do) and so having them plugged-in but switched-off at the wall when upgrading means the cases are still earthed.

Peter