Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 16 replies
  • Subscribers 34 subscribers
  • Views 2910 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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. 

 

Parents
  • 0

    There is nothing inherently wrong here, but it might be considered slightly unusual. Can you ask for the Electrical Installation Certificate and send me a copy? Type C breakers are used where there may be a significant inrush current, typically electronic lamps and appliances. The bonding is curious, as you have plastic service pipes, and the 6mm cable is undersized if they were metal. It is not wrong to bond the plumbing, and 6mm is satisfactory as supplementary bonding, but it is not a requirement. What RCD protection is there, or are the breakers RCBOs?

    Kind regards

    David CEng etc.

    email davezawadi(at)yahoo.co.uk

Reply
  • 0

    There is nothing inherently wrong here, but it might be considered slightly unusual. Can you ask for the Electrical Installation Certificate and send me a copy? Type C breakers are used where there may be a significant inrush current, typically electronic lamps and appliances. The bonding is curious, as you have plastic service pipes, and the 6mm cable is undersized if they were metal. It is not wrong to bond the plumbing, and 6mm is satisfactory as supplementary bonding, but it is not a requirement. What RCD protection is there, or are the breakers RCBOs?

    Kind regards

    David CEng etc.

    email davezawadi(at)yahoo.co.uk

Children
No Data

Community Rules & Guidelines