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6mm bonding - new build and Type C RCBOs

vantech

Hi, 

I am in the process of buying a new house (new build), and of course checked out the electrical supply. 
 

The gas and water both have what looks like a 6mm bond on a supply clearly marked PME. I would expect that the gas and water are both plastic to the point of entry. 

I have also noticed that the consumer unit has a mixture of type B and type C MCBs. 
 

Kitchen ring = 32A C 

Down sockets 1 = 20A B 

Down sockets 2 = 20A C 

First sockets = 20A B

Down lights = C10 

Up lights = C10 

All RCBOs. 

I know there is nothing inherently wrong with type C in domestic, as long as the ZS is within limits, but I haven’t seen this done before.

Any suggestions or feedback? 

Obviously I haven’t been able to strip the system back and see how it’s been installed, quality etc, but the water/gas bond has thrown me a bit. The vendor said it’s been signed off by a contractor. The install does look very tidy. 
 

Thank you. 

 

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  • 0

    Thanks David. 
     

    I am an electrician, so raised this flag with the vendor (a small house builder) who just said “it complies“. I think even asking the question upset them slightly! 

    I have asked for the certs and will share the details once I have them.

    There are RCBOs on each and every circuit, with a 100A cut-out feeding the DB. 
     

    There is also an EV charger, supplied with an earth stake, which looks very well installed.

    What has thrown me somewhat is the use of 20A radials for socket circuits rather than rings, again fully acceptable but unusual in the UK. There is a lot of LED lighting, so perhaps the use of a type C here would make sense to overcome in-rush. 

    What doesn’t add up is why 2 of the 20A socket circuits use type B and the others type C. 
     

    Thanks. 

Reply
  • 0

    Thanks David. 
     

    I am an electrician, so raised this flag with the vendor (a small house builder) who just said “it complies“. I think even asking the question upset them slightly! 

    I have asked for the certs and will share the details once I have them.

    There are RCBOs on each and every circuit, with a 100A cut-out feeding the DB. 
     

    There is also an EV charger, supplied with an earth stake, which looks very well installed.

    What has thrown me somewhat is the use of 20A radials for socket circuits rather than rings, again fully acceptable but unusual in the UK. There is a lot of LED lighting, so perhaps the use of a type C here would make sense to overcome in-rush. 

    What doesn’t add up is why 2 of the 20A socket circuits use type B and the others type C. 
     

    Thanks. 

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