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Is there no slack in the wall? If not you could (carefully) cut a the insulation out of the way and connect with straight wagos. It should be contained in a maintenance free box according to the letter of the regs but the fact that it remains accessible if the back box is removed means you could bend that rule a little bit. Proper way to do it would be pull a new piece of wire through. Sometimes that's easier than you think it would be.
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Can you pull the damaged wire through at all? Add a connector and push it back?
I have no idea if that’s a good though! My electrical adventures are pretty minimal
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Thinking about this a bit more. Can you put a deeper back box in and make the repair inside the back box. That would be a great solution.
Airhead
andos
@NotThamesWater
what's this fix for this little fuck up, other than opening up the wall (wood cladding and OSB on the outside, plaster board & PIR on the inside)?
I drilled a hole, and completely neglected to consider the live wires just on the other side.
The short can from the drill bit itself - there's no (apparent) short in the wire now.
Obvs I'd rather not open the wall up, which would be a giant pain, but I'd also rather not burn down the entire building by bodging an unsafe fix.
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