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  1. I

    10th feb 2391 exam

    For examination purposes, the best answer would be - If the mcb trips on a Zs test, don't change the mcb. Instead, get the Zs value from calculation. That is, Ze + (R1 + R2). Top tip for 2391 students - As regards "correct terminology", have a look at the 2391 chief examiner's report on the...
  2. I

    Ze testing

    PIR - want to do Ze test, but not able to disconnect earthing conductor? Do Ze test with earthing conductor connected and call it Zdb (impedance at distribution board). Cross out Ze on schedules and replace with Zdb.
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