How do electricians find power leakages and where the problem is without breaking the wall? (I have one working on my house rn and he found the leakage with the power out)
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Power doesn’t really leak. Not entirely sure what you’re referring to?
I assume you mean an earth fault, or even earth leakage current.
That is when there is “leakage” current from live to earth.
This happens when insulation breaks down. In a healthy system the live and earth should be completely insulated, no current flows. If there’s damage then you can send current down the live wire and measure what comes out the earth wire.
Once you know which wire has the fault you can either rip open the wall to repair the fault or disconnect the wire and run in a new one.
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