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Evening all. A friend has had his whole house rewired with a 4 way CU installed in the garage on its own circuit. It has an 80A RCD acting as the main switch and 2 breakers 20A and 6A for a socket and light respectively. Here’s my question; would the addition of a single light and a single socket (radial) be considered as notifiable work or is that only for circuits from the main CU?
 
Any new circuit would be notifiable.
The garage is fed from a dwelling, even if it's detached from the main house, it's still considered to be part of the dwelling.
 
Grey area this one.

if you are using the existing mcb in the board you could argue it’s an addition

if you are adding a new mcb it could be argued it’s a new circuit

me personally (tin hat on) I wouldn’t bother notifying it
 
agree with @Dustydazzler on this one,

Notifiable if you are adding a new breaker or connecting to a spare one that is not being used.
that would be under the definition of a circuit and it would be "new" as it was not there before.

however, if there is already a circuit running from a breaker, adding some more cables to it and putting as many sockets, lights, dishwashers, heaters, grow lamps, extractors, welders, etc. as you like, would not constitute a new circuit and therefore not be notifiable.

however, to comply with the wiring regulations you would still have to do the following.

design the circuit (including modifications) to comply with wiring regs,

ensure all work is to a good standard that does not reduce the safety of the installation

TEST the circuit including the modifications and record the results on a minor works certificate
provide a copy of the certificate to the person ordering the work for there records.

P.S. there is no get out clause if the person ordering the work is the same person that completes the work, it is still a requirement to record the results and document it.
 
connecting to a spare one that is not being used.
I think I misread the original post, and thought the garage consumer unit had been installed ready to add a socket circuit and a light circuit, with the mcbs fitted but not wired.
Think I need start drinking a little more, to lubricate my 2 brain cells.

If extending an existing circuit, then no notification necessary. ?
 

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