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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

    An I.E.T. Guidance Note 8 used to mention Rcp. This relates to identifying extraneous-conductive-parts. It represents the measured resistance of a conductive part to the main earthing terminal of an installation. A plastic pipe may not be electrically conductive but its liquid contents may be conductive. This could be the case with a central heating system running to metal radiators.

    A reference to B.S. published document PD 6519 and IEC 60479 is made.

    If the measured reading of a conductive part is more than 22kOhms then it is not considered to be an extraneous-conductive-part so does not need bonding.

     

    Certain special locations such as mentioned in reg.701.415.2 require supplementary protective equipotential bonding. But the need to run the cables back to the main earth terminal is not required.

     

    Z.

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  • 0

    An I.E.T. Guidance Note 8 used to mention Rcp. This relates to identifying extraneous-conductive-parts. It represents the measured resistance of a conductive part to the main earthing terminal of an installation. A plastic pipe may not be electrically conductive but its liquid contents may be conductive. This could be the case with a central heating system running to metal radiators.

    A reference to B.S. published document PD 6519 and IEC 60479 is made.

    If the measured reading of a conductive part is more than 22kOhms then it is not considered to be an extraneous-conductive-part so does not need bonding.

     

    Certain special locations such as mentioned in reg.701.415.2 require supplementary protective equipotential bonding. But the need to run the cables back to the main earth terminal is not required.

     

    Z.

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