The daft thing of course is that things like laptop psus are double insulated, but it seems not to preclude tickles from the outside of the plug that goes to the laptop if you happen to be resting your hand on an earthed item at the time. Brian
The output has to be coupled to something, so it doesn't act like a radio transmitter at the switching frequency and harmonics. If there's no earth to couple it to, it is coupled to the mains through a high- pass capacitor. Some leakage at 50Hz is inevitable, but it's fractions of a milliamp.
Not connected up on site by a DIY numpty with a screwdriver.
I know it's far fetched, but the scenario that I thought this earth was supposed to protect from is the live cable coming loose, falling out of its connection and flapping around touching the inside part of this metal fitting.
All it takes is someone not tighten up a screw properly, and (for the construction in front of me) the double insulation provided needs two failures instead of one.
IME a DIY numpty who doesn't tighten up one screw properly is likely not to tighten any of them properly - ISTM there's a high correlation of double failure here
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