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<< I’ll have the circuits tested individually. If that fails , it looks like the CU could go to the scrap yard as it is that old >> Thank you to you all: Mike (mapj1) , Paul (paulh53) , Felix , Lectrician and Breezer ! Any opinions :idea: on this one, please ? -How do you...

Many thanks to you both Felix and Lectrician ! I’ll do the circuits individually. If that fails , it looks like the CU could go to the scrap yard as it is that old. Just the last one please , chaps : How can you check CPC continuity which is incorporated inside steel trunking and...

Cheers Lectrician You have one prong on the busbar, and one on the neutral bar?? - yes MCB's off or on?? - on How many circuits/mc's? - I have 5 Thanks :oops:

Thanks for your reply Lectrician. Is the DB a submain?? - no, main board Was the CU main switch OFF?? - yes Is there an RCD or RCBO (mcb rcd combined) on the busbar - this will affect the reading - no I cannot figure it out at all :cry: Regards.

Thanks mate but it's insulation resistance test, I only got 0.01Mohm NOT 0.1m ,plus test on light circuit afterwards was fine . Here is the initial question : doing an insulation resistance test at DB between live conductors. Phase on busbar & neutral terminal. 500 VDC setting (Fluke...

Thank you for your reply Lectrician. On alternative insulation test, voltage was fine , everything correct , except for weird readings on this circuit test. System working fine, new circuits, OK Don't reg-s state that lowest should be 0.5 Mohm , moreover H & S want minimum 2Mohm...

Many thanks breezer! First couple of tests were done on SAME circuit ; on ring main circuit , with conflicting readings each time I tested. As stated above: - test reading 0.01 Mohm !!! - test volt ONLY coming up to 10 VAC last test on light circuit was fine and battery is ok...

What on earth is happening? doing an insulation resistance test at DB between live conductors. Phase on busbar & neutral terminal. 500 VDC setting (Fluke 1653) - test reading 0.01 Mohm !!! - test volt only coming up to 10 VAC phase-earth 500VDC = 9.63 Mohm neutral-earth 500VDC...