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SOLVED. By studying two responses in particular, I have found the problem - a short cut-off length of wire that had fallen inside the secondary CU, only visible by removing the RCCB. I still have to decide whether to connect to the protected side of the split board in the main CU or to the...

Of course, another solution would be to run the shed lighting and ring circuits directly into two MCBs on the protected side of the main CU (and do away with the secondary CU altogether). But I simply wanted to keep the shed isolated on a dedicated run.

The theory is sound (and an electrician will need to inspect it on completion to sign it off) but if the main CU has never tripped in 5 years or so, the only reason it is tripping now is the addition of the secondary CU. A 40A cable connects them and there is only a single socket attached to...

I note with thanks (and some relief if not a little confusion) that an RCCB is an RCD. But does this also mean that an RCD is an RCCB? (I mean an orange is fruit, but not all fruit is an orange - if you see what I mean). If they are the same thing, why are they labelled differently...

The work has been notified by means of a current Building Notice to the LABC. The Twin + Earth is new, rated 40A and exposed (not buried). The whole installation is indoors. The main consumer unit is stable (and had been for years). The problem arises when adding the secondary consumer...

I want to add a small secondary (two way) consumer unit to the main Consumer Unit, to give me easy access to the power supply in an attached shed. The main unit has a split board, the protected part having an RCD. The small unit is a two way "garage unit" on which both circuits are protected...