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I have recently had the impedance of my electrical circuits tested, and they were found to have increased over the 12 years since they were installed (from about 0.3 mΩ to 0.4 mΩ) and to fluctuate when subsequent readings are taken.

The electrician advised that all the electrical circuits would have to be replaced. My question is... is this really necessary? Could an increase in impedance be simply caused by a loose connection somewhere (for example in the fuse box)?

ThreePhaseEel
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Tom
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1 Answers1

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Unless you have aluminum wiring, there is no reason to periodically check circuit impedance. For that matter, the resistance of 10 meters of 12-gauge copper wire, often used for 20 amp circuits, is about 50 mohms, so I would question what circuits need to be replaced. The entrance cable? Certainly not your house wiring.

DrMoishe Pippik
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