This Question of the Day, about electrical testing and how loop testers work, is answered by Kew Technik (Socket & See): Question: Most loop testers plug into an AC supply to get their power source.

The calculation of the line impedance in power distribution area is of great significance in the line loss diagnosis, the evaluation of the line health status, and the optimization of maintenance work ...

Peter Wade of Megger talks about the latest developments in loop impedance testing. If you’re an electrician, you’ve almost certainly carried out a non-trip loop impedance test which produced a result ...