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How to safely fill this whole in the wall?

Yes, tone tracers, at least affordable ones, need two independent conductors, neither of which can be earthed. Not sure about the expensive models.
I've used a variety of tone tracers and never struggled to trace a single conductor.

For a shorted pair sometimes adding a capacitor in one leg works.

I have only these
1759509015751.png
and usually just connecting the red will be enough but both on a pair is vastly better.
 
The cheaper Testboy 26 definitely doesn’t work with single wires, which can be quite annoying.
 
The cheaper Testboy 26 definitely doesn’t work with single wires, which can be quite annoying.
You reckon that's cheaper?
I think I have used one of those but IIRC the place I used it would not have had a single wire issue.
 
You reckon that's cheaper?
I think I have used one of those but IIRC the place I used it would not have had a single wire issue.
I paid less than 90 Euros for mine and seem to remember it was the cheapest model on the European market then.
It claims to withstand up to 400 V but from what I‘ve read on the internet you should definitely take that with a grain of salt.
 

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