earth bonding

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If the sink is not bonded and the tap to sink "connection" is poor or the taps and not fitted in the sink then the saturated electrics will not have any path to earth so the RCD will not operate. The water will be pulled to a potential approximately mid way between live (230 volt ) and neutral ( about 0 volt ).

So without a bond the water in the sink will be at about 115 volts. Enough to provide serious shock if one is touching an earthed object and the sink.

Such as the earthed taps mentioned previously. If you have taps which are bonded by way of the pipework, then it makes absolutely no sense not to bond to the sink as well to ensure that no difference in potential can exist between them.
 
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Such as the earthed taps mentioned previously. If you have taps which are bonded by way of the pipework, then it makes absolutely no sense not to bond to the sink as well to ensure that no difference in potential can exist between them.
Indeed, particularly given that plastic parts of the 'fitting kits' (bushes, washers etc.) are sometimes such that the metal taps (bonded to earth via pipework) are not necessarily in electrical contuinity with the metal sink to which they are attached - so the taps can't be guaranteed to bond themselves to the sink.

I know that people normally talk about metal sinks when this issue is being discussed but, unfortunately, the theoretical problem is almost as bad (but more difficult to address) with a non-metallic sink with 'bonded' taps (plastic sink full of water into which a live electrical appliance has been dropped, with nearby earthed taps). Sink waste fittings usually have metal bits that one might try to use for bonding, but it wouldn't be easy.

Kind Regards, John.
 

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