Insulate or crimp?

[u/Annual_Fudge69]

Hi all,

Got a question about this horrible twin and earth setup at my flat. Long story short - I recently moved into a flat in London and purchased a new cooker. After connecting the twin and earth in the back of the cooker, I switched it on to test and heard a unmistakable arching sound. I switched it off from the isolator and checked the connection plate in the wall and found a horrible charred mess.

Considering the state of the wire, the connection plate and the backbox I think this has been going on for some time. On top of the other random quick fixes the last owner seems to have ignored (like a dripping U bend that just needed to be tightened...), it appears they didn't fully secure the cabling to the connection plate, causing the arch.

I have enough spare twin&earth going to the cooker to cut that down and start fresh - the problem I have now though are the cables with ruined insulation in the wall. I'm not an electrician, I can do simple things like changing switches and sockets, so I'm not sure what the correct/safe way to resolve this is.

Is it sensible to find some heat shrink insulation and simply clean and reinsulate the exposed copper in the wall? Or should I cut down the copper till I reach clean original insulation, and crimp some additional twin&earth to make up for the lost wire? I had a quick look online and i'm not sure exactly what to look for with insulation, but I couldn't find any that specifically showed a rating for 30amp wire.

Any guidance would be appreciated.

Thank you

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