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.