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I intend to install a cable to supply power to a CU in an integral garage.
I am a retired electrician, I passed my iee (16th) and Part P a good few years ago so I need some advice regarding current iee regulations.
The cable needs to be taken from an existing Henley block on the consumer board (the existing CU’s are fully utilised with no free MCB’s). The cable will be appprox. 5 metre to the garage CU running in the under floor void (under floor boards) across the house and through the house wall into the garage).
Question :-
Does this require a separate isolation switch at the consumer board but after the Henley block given that the cable run is approx. 5 metres and will this require additional protection at the house wall e.g. conduit etc.

Hi itsmalc
Suggest your cable to the garage is armoured cable, you will need to fit an additional CU near to the Henley block or replace an existing CU to give you more ways.
You probably need to involve an electrician.
Regards S

Ok, thanks for the advice. I think I'll use armoured 10mm cable and fit an isolator switch on the cu board, a 3 way cu in the garage to supply a ring main and lighting witch would have 1 spare space.

Hi itsmalc
Suggest you use a fused isolator switch.
Regards S

Ok, thanks for advice, I intend I a fused isolator, forgot to include FUSED