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I have measured high currents in the CPCs of four circuits as shown in the table below.
  • This is the case both with the circuits energised and isolated.
  • Removing the CPCs for these four circuits brings the current in the MET to DNO cut-out, back to genuine L+N measured leakage levels.
  • However with the CPCs connected, the current in the MET to cut-out increases significantly under load (4.1A with a 19A load, 5.6A with a 31A load) as opposed to 19mA and 22mA respectively with the four CPCs disconnected.
  • Ze is good.
Any ideas?

High CPC current tests 110819.jpg
 
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Wilko

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