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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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    Another question is whether time switches, contactors, kWh meters etc. associated with a particular circuit should be located as close as possible to the MCB / RCBO for that circuit or should they be located on one side of the consumer unit and the MCBs / RCBOs located on the other side?
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  • 0
    Another question is whether time switches, contactors, kWh meters etc. associated with a particular circuit should be located as close as possible to the MCB / RCBO for that circuit or should they be located on one side of the consumer unit and the MCBs / RCBOs located on the other side?
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