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Shower with no RCD or supplementary bonding

MrJack96

I have been round to a relatives flat and seen he has an old Wylex board with MCBs. His bathroom has no supplementary bonding from what I can see and no RCD protection for his electric shower. how potentially dangerous is this? I know the circuits are fairly short and can see main bonding in place Can only really think if the R2 values are low enough touch voltages should end up being kept low? 

 

 

 

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    Usually. Unless the water is contaminated for some reason - water out of the tap  in the UK is pretty poor conductor,  a k ohms or few per cm cube (now imagine a pipe full of cm cubes in series, or the higher resistance of those cubes sliced into thinner layers on the tiled wall.)

    Water with shampoo or baths salts in is a much better conductor than tap water, as is water with a lot of sweat, blood or other biological fluids. So ‘safe’ levels of touch voltages in the bath are far less than in the dry, and in surgery are even  less again …

    Sea water is about as good a conducting liquid as you will find in nature that is not a liquid metal…

     

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    Usually. Unless the water is contaminated for some reason - water out of the tap  in the UK is pretty poor conductor,  a k ohms or few per cm cube (now imagine a pipe full of cm cubes in series, or the higher resistance of those cubes sliced into thinner layers on the tiled wall.)

    Water with shampoo or baths salts in is a much better conductor than tap water, as is water with a lot of sweat, blood or other biological fluids. So ‘safe’ levels of touch voltages in the bath are far less than in the dry, and in surgery are even  less again …

    Sea water is about as good a conducting liquid as you will find in nature that is not a liquid metal…

     

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