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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: 
     

    vantech: 
     

    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?  

    If it's not “main protective bonding”, what is it? If “main protective bonding” is not provided, have you checked whether it's permissible to omit supplementary local equipotential bonding in rooms containing a bath or shower (or is it provided anyway)?

    There are RCBOs for each and every circuit. 

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  • 0

    gkenyon: 
     

    vantech: 
     

    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?  

    If it's not “main protective bonding”, what is it? If “main protective bonding” is not provided, have you checked whether it's permissible to omit supplementary local equipotential bonding in rooms containing a bath or shower (or is it provided anyway)?

    There are RCBOs for each and every circuit. 

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