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practical need for supp bonding in bathroom

wallywombat
Can anyone suggest a realistic scenario where supplementary bonding would be required in a bathroom or other 701 location? I'm failing to think of one, although I may be overlooking something blindingly obvious.


It can be omitted as long all three of these are satisfied: ADS in time; RCD present; any extr-c-p connected to main bonding.


If ADS can't be done in time by either MCB/RCD then its not legal anyway.

RCD has to be present anyway.

Water and gas pipes etc should already be main bonded if they introduce a potential.
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    The conductivity of tap water in the UK is quite low, even in hard water areas a meter or so of plastic pipe will probably be 50 to 250kohms or so depending where you are..
    a JW video where he measures it.  It is therefore safe to assume that anything more half a meter will provide the necessary isolation to call the section of chrome isolated.


    I am less sure about radiator water, which after a while may well be rather more dissolved metal ions than the stuff out of the tap, and more conductive, especially with ionic inhibitors intended to make the water slightly alkaline. It might be sensible to assume 10 times worse.
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    The conductivity of tap water in the UK is quite low, even in hard water areas a meter or so of plastic pipe will probably be 50 to 250kohms or so depending where you are..
    a JW video where he measures it.  It is therefore safe to assume that anything more half a meter will provide the necessary isolation to call the section of chrome isolated.


    I am less sure about radiator water, which after a while may well be rather more dissolved metal ions than the stuff out of the tap, and more conductive, especially with ionic inhibitors intended to make the water slightly alkaline. It might be sensible to assume 10 times worse.
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