Replace this bonding or not?

[amfisted]

Apologies for yet another bonding question. Just can’t quite get my head around what’s required, and what isn’t.

I’ve just replaced our old sink ( probably 80s vintage) with a new vanity unit. The hot and cold water pipes ( both copper) were bonded together with very old, very corroded clamps and cable. Do I need to replace this bonding? The copper ( there’s no plastic) cold water main is bonded about 12 inches from where it enters the house to a 10mm earth cable that travels along an outside wall to the modern consumer unit ( RCDs, MCBs etc).

Thanks in advance

 

[EFLImpudence]

Presuming this is in the bathroom, then it depends.

If you have RCDs on all the bathroom circuits and, as you say you have, main bonding then this supplementary (additional) bonding is not required.

 

[ebee]

Presuming this is in the bathroom, then it depends.

If you have RCDs on all the bathroom circuits and, as you say you have, main bonding then this supplementary (additional) bonding is not required.

Correct.
There is nothing to stop you replacing any supplementary if you want to which is a bit "belt and braces" just like in the days before RCDs were so prevalent or to mitigate against an RCD failure if that makes you feel happier. Some research of RCD failure suggests a failure rate of about 7% might be a consideration.

 

[amfisted]

Post deleted due to duplication

 

[amfisted]

Correct.
There is nothing to stop you replacing any supplementary if you want to which is a bit "belt and braces" just like in the days before RCDs were so prevalent or to mitigate against an RCD failure if that makes you feel happier. Some research of RCD failure suggests a failure rate of about 7% might be a consideration.

Thank you. I probably won't replace it.

 

[amfisted]

Presuming this is in the bathroom, then it depends.

If you have RCDs on all the bathroom circuits and, as you say you have, main bonding then this supplementary (additional) bonding is not required.

The only electrics in the bathroom are a single light fitting and a 12v extractor fan, both of which are on the RCD-protected lighting circuit. Thanks for your guidance and I won’t replace the bonding in question.