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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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    Legh Richardson:
    "people used to do that (including things like window frames) and a myth has come about that the 15th required bonding everything"


    They did. It was standard practice in the 70s and 80s to Equipotentially Bond the Crittle window frames that were fitted in prefabricated houses as the supporting studding was fixed into the ground floor and the ceiling.




    Oh my word! I must run some green and yellow up to the 1920s Crittall windows in my conservatory. Oh yes, and I mustn't forget to bond the steel framework, which being buried in the floor, might well be an extraneous CP. It will complement the 1980s SRCDs. ?

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  • 0

    Legh Richardson:
    "people used to do that (including things like window frames) and a myth has come about that the 15th required bonding everything"


    They did. It was standard practice in the 70s and 80s to Equipotentially Bond the Crittle window frames that were fitted in prefabricated houses as the supporting studding was fixed into the ground floor and the ceiling.




    Oh my word! I must run some green and yellow up to the 1920s Crittall windows in my conservatory. Oh yes, and I mustn't forget to bond the steel framework, which being buried in the floor, might well be an extraneous CP. It will complement the 1980s SRCDs. ?

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