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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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    Having read the complete post before realising the age of the OP I thought the criticism of the lack of guidance was unfounded as I believe it all depends.


    Today I would normally go for an all RCBO board unless the cost was prohibitive for the customer. I would also apply some basic analysis to the impact of a trip on the customer and recommend an appropriate solution. So a maniac experimenter may well get a different recommendation to a partially sighted OAP which would probably be different to the young family with many young children a couple of showers and washing machines going flat out. Whether they would take that recommendation is of course debatable when someone proposes a cheap one RCD solution for cash and let's forget about Part Pee.
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  • 0
    Having read the complete post before realising the age of the OP I thought the criticism of the lack of guidance was unfounded as I believe it all depends.


    Today I would normally go for an all RCBO board unless the cost was prohibitive for the customer. I would also apply some basic analysis to the impact of a trip on the customer and recommend an appropriate solution. So a maniac experimenter may well get a different recommendation to a partially sighted OAP which would probably be different to the young family with many young children a couple of showers and washing machines going flat out. Whether they would take that recommendation is of course debatable when someone proposes a cheap one RCD solution for cash and let's forget about Part Pee.
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