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Mains appliance disclaimer

Alex Barrett
I recently bought a mains appliance, specifically worktop power outlets with USB chargers built in. On the back the label states "This unit should NOT be subject to any insulation resistance testing", and also "THIS LABEL SHOULD BE REMOVED DURING INSTALLATION".


Is this a legitimate constraint for a mains appliance? Shouldn't any device designed for mains power be able to cope with likely power line events?
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    My concern is that whilst an electrician might install this device and be aware of the issue, future electricians performing the tests, and certainly lay householders, will be unaware of this constraint. Does an electrician who is contemplating performing a site test do an exhaustive survey for susceptible devices before they commence? I'd imagined part of the design requirement would be withstand of such voltages without damage.
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    My concern is that whilst an electrician might install this device and be aware of the issue, future electricians performing the tests, and certainly lay householders, will be unaware of this constraint. Does an electrician who is contemplating performing a site test do an exhaustive survey for susceptible devices before they commence? I'd imagined part of the design requirement would be withstand of such voltages without damage.
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