does 6mm bonding to water pipe have to changed ..

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Does a CU change mean that existing 6mm bond to water has to be upgraded as well?
 
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It depends on the supply type to the property, but it will often be replaced as part of the consumer unit replacement works
 
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Always upgrade to 10mm when I do a board change.....stops my assessor giving me grief
 
I don't have a problem upgrading it per se, its just the fact that plasterboard etc will have broken and re-plastered which is just adding expense after expense to this CU upgrade ....
So if it doesn't need to be done I really don't want to ......
 
My take on it is that when you are doing works as major as a CU upgrade, the bonding would to be in a condition that could be considered 'satsifactory' in EICR terms, so if you carried out an EICR the next day, you wouldn't allocate any C1/C2 codes to it (bonding could never really get a C1 code anyway).

So what EICR code would you give to undersized bonding?, personally I'd probably look towards a C3 for the 6mm main bonding on a domestic TNCS (remember though that if TT, it might not be undersized at all), the NICEIC best practice guide however classes "Inadequate cross-sectional area of a main protective bonding conductor provided that the conductor is at least 6 mm2 and that there is no evidence of thermal damage." under "Items worthy of note that do not warrant a classification code (These comments should be recorded on the EICR in the observations section)", so maybe my C3 is even a bit on the over zealous side, although I'm sticking by it! , one could, not however justify a C2 for it, so the situation is not unsatisfacory.

So personally, if the servcies were right nearby, its worthwhile sticking 10mm in and being done with it, if its not as simple as that, then I see no harm in (as long as no signs of thermal damage) then I see no harm in just noting it in comments on existing, the same as I would for it not being made in quite the right place (but having continuity through the service), or it being looped through multiple services but not kept upbroken (as long as connections were sound)
 

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