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How to wire up a consumer unit

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 Chris Pearson over 5 years ago

Legh Richardson:

By the way, where have you put the smoke alarms and CO2 alarms? separate circuit or connected into existing circuits?

This is, IMHO, where "high-integrity" boards are useful (if not all RCBO). If the alarms are on their own circuit and RCBO, nothing other than a fault in the alarms or their own circuit will put them out of action.

The counter argument is to use an adjacent lighting circuit so that the occupants are aware if the circuit has tripped.
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0 Chris Pearson over 5 years ago

Legh Richardson:

By the way, where have you put the smoke alarms and CO2 alarms? separate circuit or connected into existing circuits?

This is, IMHO, where "high-integrity" boards are useful (if not all RCBO). If the alarms are on their own circuit and RCBO, nothing other than a fault in the alarms or their own circuit will put them out of action.

The counter argument is to use an adjacent lighting circuit so that the occupants are aware if the circuit has tripped.
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How to wire up a consumer unit

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