48f33dfe$1@news.povray.org...
>> Typically in the UK, the mains circuit, the socket *and* the plug all 
>> contain fuses.
>
> Fuses do not act fast enough to stop you getting a lethal dose of current. 
> That's why RCD devices are used.
>

It is not so a speed issue than a current issue.
If I don't mistake, RCD switches off if the difference between both wires 
(which is assumed to be a leakage through a body for example) is higher than 
30mA which is far less (typically around 500 x less) than the max current 
that blows the fuse.

Marc

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