Evening gents, Testing for PFC today and my Megger 1552 bleeped and ticked as normal and then displayed E79. I changed the batteries and tried again and again and still got the same. I spoke to megger and the guy said that code would show if there was 'noise' or interference detected, so I switched the house off and tried again but no change. I suppose I can put the standard figure on the cert but has anyone got an idea as to what the problem might be?
First, thing I would do, is check the mains voltage is stable! Then do the pfc! Then do same too, on a different property, and compare the readings!
System is tncs, Ze 0.17. I have installed a small additional board for new extension fed from henley.
Now you got me! Say a tns, would have it down, as an earth fault, if readings differ, within 2v! But a pme, don,t know! TRY, against another property, on a different phase, to rule out mains!
Thanx sparkin, will be going back tomorrow to sort a faulty smoke alarm and will try again and compare. Have a good evening.