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Bonding a metal bath

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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  • AJJewsbury:

    But what about situations like my old Grandmother's house. ... If you consider only the protective devices of the bathroom sockets ...




    Slip of the pen there, or a big bathroom?


    Andy's point is well-made, but the supply was probably not PME when the installation was made (mine certainly wasn't) and as I have said before, 30 years ago sparks seemed to get carried away with bonding. Only one hot to cold pipe bond is required for a soldered copper water installation. However, under every wash hand basin, bath and sink in our house they are bonded. Crikey, there is even bonding between the pipes beneath both of our double kitchen sinks as well as to the sink itself.

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  • AJJewsbury:

    But what about situations like my old Grandmother's house. ... If you consider only the protective devices of the bathroom sockets ...




    Slip of the pen there, or a big bathroom?


    Andy's point is well-made, but the supply was probably not PME when the installation was made (mine certainly wasn't) and as I have said before, 30 years ago sparks seemed to get carried away with bonding. Only one hot to cold pipe bond is required for a soldered copper water installation. However, under every wash hand basin, bath and sink in our house they are bonded. Crikey, there is even bonding between the pipes beneath both of our double kitchen sinks as well as to the sink itself.

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