Can I repair a cut LED lights' cable?

[BlueShed]

I've just worked out why this set of garden Christmas lights stopped working!

Can I peel back the outer to expose the wires and twist them round each other, then cover it with insulating tape, or doesn't that work with LEDs?

You could, but you'd need to do it properly to be safe.

Use these.
Peel to access the 3 wires, then re-join in the correct order. Twist then insulate each joint with self amalgamation tape.

It would be ugly but waterproof.

This is not my idea, I would look on this as a universe direction to buy more fairy lights, but DH's. Electronics engineer so does this sort of thing all the time.

Thanks.

They were new this year and it's a set on lit up cone trees which I really like, so I'd like to give it a go at repairing before I bin them, but don't want to waste the time if it's a non-starter!

It looks like 3 separate wires, so make sure they correspond and join each separately. Use the white lines to help.

Garden?!!

There's no way I'd be repairing 240V outdoors wiring with electric tape!!!

Although I'm not quite sure what I'm looking at here. That doesn't look like 240V wiring.

But even so, an outdoors repair... How could you be sure it was waterproof? What is it near to catch fire if it shorts the whole lot?

Yes you can.
My DH regularly extends our outside lights.
Best way could be to use a 'chocolate box' but stripping back twisting and insulating tape should do the trick.

Assuming it is not mains, which it probably isn't but you should check, I would :

Split the insulator webbing holding the wires together.

Put heat shrink tubing on each individual wire before soldering, and put on an additional larger piece over all three to seal the whole lot up (make this pretty long - you will have to do it before soldering).

Strip back the wires and then twist together (making sure you connect the right ones).
Solder over the twist to make a good connection and stop them coming apart.
Shrink the heat shrink over each individual connection (make sure the shrink extends well past the exposed conductor onto the insulator each side of the join.
When that is all done pull the final bit of shrink over all three wires and shrink that in place. You can get glue backed shrink that will make a good seal.

That should do it. Hopefully the SM power supply (black box thingy) was not damaged when the cable was cut.

As an aside, it looks like the cable was cut deliberately. That looks like quite a neat cut.

Op , strip the insulation back to expose the cable/ cores and then twist them together to make sure everything still works as it should. Ive only ever seen 12v Christmas lights so even if you do touch something live it will only be an ouch at the most. If they still work then all you need is a wago box , screwfix sell them for a couple of quid ……job done 👍