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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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  • 0
    The shower manufacturer may have installed a supplementary bonding connection within the electric shower casing, it depends on which manufacturer it is. Alternatively the electrician may have added one if appropriate, but either way there isn’t likely to be any exposed conductive parts to the shower that the user of the shower can touch.


    The only part of the installation that is described in the original post that is likely to have a voltage on it is the wall mounted taps. If they are mono block taps you aren’t going to put a hand on the hot tap and the other on the cold tap and be exposed to a voltage difference between them.


    But there hasn’t been any mention of a radiator, can you reach that to get a towel off it whilst you are still turning a tap off?


    The bath as described is unlikely to present a risk, but there still could be other risks present.


    Andy Betteridge
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  • 0
    The shower manufacturer may have installed a supplementary bonding connection within the electric shower casing, it depends on which manufacturer it is. Alternatively the electrician may have added one if appropriate, but either way there isn’t likely to be any exposed conductive parts to the shower that the user of the shower can touch.


    The only part of the installation that is described in the original post that is likely to have a voltage on it is the wall mounted taps. If they are mono block taps you aren’t going to put a hand on the hot tap and the other on the cold tap and be exposed to a voltage difference between them.


    But there hasn’t been any mention of a radiator, can you reach that to get a towel off it whilst you are still turning a tap off?


    The bath as described is unlikely to present a risk, but there still could be other risks present.


    Andy Betteridge
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