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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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    gkenyon: 
     

    In terms of main bonding … if PME conditions apply, any and all main bonding should comply with Table 54.8 (min 10 sq mm).

    If it's not main bonding, and not a cpc, why is it connected to MET? 

    The gas and water are bonded back to the MET in the DNOs cupboard. I had a quick look and it was a 6mm.

    If the water and gas come in via plastic pipes (assuming they could be as this is a new build), main equipotential bonding can be omitted, so it could be the case this is just supplementary bonding for everything inside of the dwelling?  

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  • 0

    gkenyon: 
     

    In terms of main bonding … if PME conditions apply, any and all main bonding should comply with Table 54.8 (min 10 sq mm).

    If it's not main bonding, and not a cpc, why is it connected to MET? 

    The gas and water are bonded back to the MET in the DNOs cupboard. I had a quick look and it was a 6mm.

    If the water and gas come in via plastic pipes (assuming they could be as this is a new build), main equipotential bonding can be omitted, so it could be the case this is just supplementary bonding for everything inside of the dwelling?  

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