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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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    vantech: 
     

    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. 

    I know a number of people in the industry who absolutely hate ring final circuits. Some of those people have seen all too often the problems caused “when rings go wrong”.

    (Perhaps “When Rings Go Wrong” is a good title for a series of articles or videos in the industry media somewhere?)

    To be honest, the only reason we need a fused plug that's so clunky, is the fact we insist on continuing to use the ring final circuit. Aside from using extra ways, there are huge benefits in running 2 no. B20 radials over 1 no. B32 ring final circuit for general purpose socket-outlets.

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  • 0

    vantech: 
     

    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. 

    I know a number of people in the industry who absolutely hate ring final circuits. Some of those people have seen all too often the problems caused “when rings go wrong”.

    (Perhaps “When Rings Go Wrong” is a good title for a series of articles or videos in the industry media somewhere?)

    To be honest, the only reason we need a fused plug that's so clunky, is the fact we insist on continuing to use the ring final circuit. Aside from using extra ways, there are huge benefits in running 2 no. B20 radials over 1 no. B32 ring final circuit for general purpose socket-outlets.

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