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How to wire up a consumer unit

Arran Cameron

A semi-detached house has a prehistoric fuse box with rewirable ceramic fuses. It will shortly be replaced with a modern consumer unit. The existing circuits are:



 



1. Lights



2. Upstairs sockets



3. Downstairs sockets



4. Kitchen sockets



5. Cooker



6. Shower



 



The following circuits will be added to the consumer unit:



 



7. Central heating



8. Burglar alarm and CCTV



9. Outside lights



 



I have been informed that the best choice is a split load consumer unit with two RCDs and space for RCBOs. My intention is that circuit 8 has its own RCBO but what is the optimal way to allocate circuits to RCD A and RCD B? Also, should any other circuits have their own RCBO?


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  • 0

    Alasdair Anderson:

    You may want to consider putting the kitchen sockets on their own RCBO as kitchen items are one of the more common sources of earth faults (with kettles and irons being particularly guilty).

    Alasdair




    Would it be a good idea to put Circuit 4 and Circuit 5 on the same RCD? If so, then should Circuit 7 or Circuit 9 also be added?



     

Reply
  • 0

    Alasdair Anderson:

    You may want to consider putting the kitchen sockets on their own RCBO as kitchen items are one of the more common sources of earth faults (with kettles and irons being particularly guilty).

    Alasdair




    Would it be a good idea to put Circuit 4 and Circuit 5 on the same RCD? If so, then should Circuit 7 or Circuit 9 also be added?



     

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