Anything could be fitted with a 5A plug by someone removing the 13A one supplied with it and putting a 5A one in its place.Incidentally vacuum cleaners could be fitted with a 5a plug, though unlikely these days.
So, the switch in question is located downstairs. Do you think that you would isolate that switch by turning off the downstairs lighting circuit breaker??
THEN THAT WOULD BE THEIR FAULT.A professional spark or someone with common sense would look for the feed if a switch is still live, but such a feed is not necessarily the most obvious. Somebody else may just make the (potentially dangerous) assumption that all is dead if the lighting circuits are off.
When you're crossing the road, and the little green man has come on, do you just step out, assuming that the car approaching is going to stop, or do you wait a bit until you know he's going to?
When you buy a reduced item in the supermarket, do you assume that the person on the till will have got it right, or that the barcode will have been right, or do you check your receipt?
When you get given change, do you assume that it must be OK, or do you check it?
People with no common sense should not work on electrical installations, and it is not the job of a designer to eschew the right design in case in the future some uninformed idiot does what he is not supposed to do.
Precisely.If it is important to you, you will check it - electric is off, road is clear, change, whatever
That is completely different, and it's worrying to think that you might be having anything to do with designing stuff if you can't see that.I wonder how many "informed" have had a shock from something unexpected? There have been posts here that someone has had a shock as an automated switch has operated feeding a notionally dead circuit. Should not the designer account for this. The circuit may have been modified and to the best of your knowledge is safe to work on when you start.
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