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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?


Parents
  • 0
    The proposed wire up is:

     

    7. Central heating (MCB)



    2. Upstairs sockets (MCB)



    3. Downstairs sockets (MCB)



    RCD 63A



    9. Outside lights (MCB)



    4. Kitchen sockets (MCB)



    5. Cooker (MCB)



    RCD 80A



    8. Burglar alarm and CCTV (RCBO)



    1. Lights (RCBO)



    Main Switch




    With the central heating breaker on the LHS and the main switch on the RHS. Circuits 4, 5, and 9 are protected by the 80A RCD. Circuits 2, 3, and 7 are protected by the 63A RCD. Future higher current or outside circuits will be connected to the 80A RCD and future lower current inside circuits will be connected to the 63A RCD. Future critical circuits will have their own RCBO.


    Can anybody fault this wire up?
Reply
  • 0
    The proposed wire up is:

     

    7. Central heating (MCB)



    2. Upstairs sockets (MCB)



    3. Downstairs sockets (MCB)



    RCD 63A



    9. Outside lights (MCB)



    4. Kitchen sockets (MCB)



    5. Cooker (MCB)



    RCD 80A



    8. Burglar alarm and CCTV (RCBO)



    1. Lights (RCBO)



    Main Switch




    With the central heating breaker on the LHS and the main switch on the RHS. Circuits 4, 5, and 9 are protected by the 80A RCD. Circuits 2, 3, and 7 are protected by the 63A RCD. Future higher current or outside circuits will be connected to the 80A RCD and future lower current inside circuits will be connected to the 63A RCD. Future critical circuits will have their own RCBO.


    Can anybody fault this wire up?
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