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Bonding a metal bath

David-Adams
Good evening


I am having one of those moments where I can’t sleep because I am worrying about something I probably don’t need to. That’s the rational part of me talking, unfortunately the anxiety monster won’t b***** off. 


We have just had our old cast iron bath replaced with a nice new shiny steel one. The old bath was bonded back to the terminal block by main consumer unit over 6mm earth cable via the airing cupboard. We also have an electric shower. 


The new bath has no taps on it (they are wall-mounted and fed by copper pipes). The waste is all plastic. The electric shower has been replaced with a new electric shower. The copper pipes in the airing cupboard have been connected via a new 4mm earth cable. My electrician says that according to the 18th edition, there is no requirement for the metal bath to be bonded. 


I have no reason to doubt him, except for the anxiety monster eating away at my brain I mentioned earlier. What limited literature I have found seems to suggest this is correct, but in some circles it is a hotly debated topic with contradicting views. I was just wondering if someone could confirm this for me please. I would also be interested in understanding why this is the case to satisfy my own natural curiosity of all things!


Many thanks in advance
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    Sparkingchip:

    The wet and nearly naked, except for the swimming costume, bit really applies to items such as the stainless steel post lights around the hot tub in the garden, rather than equipment and fittings inside of the house.


    But it has to be remembered that TNCS earthing is not acceptable in all installations and properties and ultimately it is the installation electrician who has to decide what the earthing system will be, just because the DNO have supplied an earth terminal doesn’t mean that it should be used.




    I really don't think its a recommended practice to export PME beyond the natural bonding zone of the house installation. Usually (my method) would be to provides a PME protected 2-core SWA into an insulated terminal box and a new TT earth to the hot tub. But then there are always exceptions to the rule.


    Legh

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  • 0

    Sparkingchip:

    The wet and nearly naked, except for the swimming costume, bit really applies to items such as the stainless steel post lights around the hot tub in the garden, rather than equipment and fittings inside of the house.


    But it has to be remembered that TNCS earthing is not acceptable in all installations and properties and ultimately it is the installation electrician who has to decide what the earthing system will be, just because the DNO have supplied an earth terminal doesn’t mean that it should be used.




    I really don't think its a recommended practice to export PME beyond the natural bonding zone of the house installation. Usually (my method) would be to provides a PME protected 2-core SWA into an insulated terminal box and a new TT earth to the hot tub. But then there are always exceptions to the rule.


    Legh

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