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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
    An installation with ten 30 mA RCBOs could have a couple of hundred milliamperes of current running around the plumbing and earthing system without any RCD trips, whereas as the budget installation with one 30 mA RCD upfront would have shut down.


    Installing RCBO consumer units when it is apparent that there is issues with excessive earth leakage due to failing installation to spread the earth leakage across multiple RCDs is a bit dodgy.


    In a TT installation even with double pole 30 mA RCBOs a 100 mA RCD main switch serves a purpose.


    Andy Betteridge
Reply
  • 0
    An installation with ten 30 mA RCBOs could have a couple of hundred milliamperes of current running around the plumbing and earthing system without any RCD trips, whereas as the budget installation with one 30 mA RCD upfront would have shut down.


    Installing RCBO consumer units when it is apparent that there is issues with excessive earth leakage due to failing installation to spread the earth leakage across multiple RCDs is a bit dodgy.


    In a TT installation even with double pole 30 mA RCBOs a 100 mA RCD main switch serves a purpose.


    Andy Betteridge
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