Demolition of a lean-to attached garage that has electric lights and a switch. Cables enter near top of lean to. What precautions needed for demolition, electricity-wise?

Builder probably knows, but I would like to understand too.

Isolation of the electrical supply before the cables enter the lean-to. To make it safe for demolition.

 

Cables could then be put into a waterproof socket or joint box to keep the cabling or removal back to the fuse board or nearest electrical point.

 

10 hours ago, WWilts said:

Cables enter near top of lean to.

 

Cables entering as in plural?

 

I wonder if the electrics in the lean to are just extensions of the house lighting circuits and ring mains rather than on a dedicated "Garage" circuit?

 

Is there a circuit breaker in your consumer unit labelled as "Garage"?

6 hours ago, Onoff said:

I wonder if the electrics in the lean to are just extensions of the house lighting circuits and ring mains rather than on a dedicated "Garage" circuit?

 

Is there a circuit breaker in your consumer unit labelled as "Garage"?

No circuit breaker labelled Garage. One of the 2 circuit breaker switches labelled "ring main" isolates all of garage. Lights and sockets in garage all get isolated by this switch.

 

But this same switch also isolates sockets in the adjoining first floor bedrooms. There is a small box high on the garage wall. From here, cables run in at least 3 directions to various parts of the garage. Suspect the wiring runs under the first floor bedroom floorboards and through the wall into the high box high on the (internal) garage wall.

 

Apart from keeping the garage completely isolated during demolition, what is likely to be required in terms of dealing with the existing live cables/live box on the internal wall?

 

 

(This wall will survive but will again become an external wall. Electrics compliant with BR will be required in the small glazed porch that will replace the demolished garage. The porch is generally exempt from BR according to LA BC)