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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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    wallywombat:



    I don't follow. 701.411.3.3 requires RCD protection for the circuits in the bathroom. Then 701.415.2 (v) says that you can omit bonding if (amongst other things) RCDs are present. Or are you saying that for existing installations which don't have an RCD on the relevant circuits, then its ok to modify the circuit without adding an RCD, but you must add supplementary bonding???


    Depending on what your modifications entail, you might not have to add an RCD to that circuit and definitely not to any other circuits.


    The supplementary bonding should already be there, shouldn't it? You can check and if not, fit it.



    Have you been telling your customers that new consumer units are compulsory before any other work can be carried out?
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    wallywombat:



    I don't follow. 701.411.3.3 requires RCD protection for the circuits in the bathroom. Then 701.415.2 (v) says that you can omit bonding if (amongst other things) RCDs are present. Or are you saying that for existing installations which don't have an RCD on the relevant circuits, then its ok to modify the circuit without adding an RCD, but you must add supplementary bonding???


    Depending on what your modifications entail, you might not have to add an RCD to that circuit and definitely not to any other circuits.


    The supplementary bonding should already be there, shouldn't it? You can check and if not, fit it.



    Have you been telling your customers that new consumer units are compulsory before any other work can be carried out?
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