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A short update. I deconstructed the 2 main lighting cct connection boxes in the loft, where I cut an access hole. It was like trying to arrange spaghetti with 1 hand 10inches down a rabbit hole - working in that access space... I tested all legs for N+E. And found the problem cable - it was...

Hi, yes good spotting. I did write in the previous post with the photo the earth connections on all the junction boxes are made around the back. But there's quite a lot of text in this thread now, so I understand why you didn't see it. Bit unconventional? I suppose it was done because they're...

When I get this basic insulation tester and need to test the lighting cct, neutral and earth, im assuming I need to remove all led bulbs in lamps and disconnect the start of led ceiling down light cable runs to exclude? Unfortunately l, the outside two lights are not the obvious fault as I...

So, some updates. I rechecked my multi meter impedance testing of the circuit with the live and earth of the outgoing wire disconnected and I was wrong. There is no reading between Neutral and Earth with the earth wire disconnected from the earth bar of the consumer unit. I must have tested...

Ok thanks @Razor900 and @Madrab. I already had the long sds plus masonry bits so I did as before and suggested here. Pilot 10mm, then 20mm, then 28mm. Before going through the plaster inside I turned to drill only without percussion. All turned out fine. Thanks. Few photos. Now for...

I should of just asked for it. But this fault showed itself when an electrician did a cu change out. So the quote was for all RCBOs. The lighting cuts were on the non rcd protected side of board. So he changed the cu, then said I had a fault and he couldn't use the rcbo... I know, what he...

Yeah ok. Thanks. I'll double check what i,m telling you tomorrow. Which i guess indicated a dead short between neutral and earth ..... somewhere. The switches just have live in and out. So all neutrals in loft. There aren't many ceiling roses anymore. Maybe 2 most have been changed to...

Ok. Board turned off at double pole isolator. Neutral removed from mcb. (Edit. Actually neutral of problem cct removed from board neutral termination.) Multimeter set to 200 ohms. Between neutral and earth of problem cct. 1.5 ohms. Between neutral of problem cct and earth connections on...

You're right. But I will either go and buy one or I could remove one from an active cct to carry out tests. So will progress someway and report back. Thank you.

Thanks all, just catching up. Thanks for the pointers and suggestions. I will start and turn all power off and look what my multi meter says for resistance between neutral and earth on the faulty lighting cct. If I've read the instructions right. I will re-read again before carrying out. I could...

Yeah ok. Thanks. Just quite rare and not in a brand I recognise but I may just go with it. On the cheap side. But I am only doing 2 holes!! Is that a normal arbor thread or is it for a specific core drill. I will do some searching... Tks Thanks for the other replies as well. Yes, I could use my...

Oh, ok. I though sometimes, especially upstairs / down stairs lighting, a neutral is borrowed from within the house, from say the downstairs lighting or vice versa because it was closer / more accesible at time and does not cause an over current situation but will cause an RCBO to trip because...

thanks, yes - I checked outside lights thoroughly including junctions in roof space. There's no sockets in this case as it is lighting only. I could disconnect dimmers, there is only 1 or two downstairs. It is not overload as the electrician mumbled neutral / earth leak. I didn't hear it but...

yes, exactly what the original electrician mumbled..

Started a few months ago at time of CU change out to new RCBO unit, so fault probably inherent for who knows how long....anyone's guess.. be interesting to see the IR test results for the circuit First things first - if you can take out all the bulbs on the affected circuit. Then turn the MCB...

edit: an RCBO trips straight away, and was tried with an alternative, so it was "temporarily" replaced with an MCB to give service. Slightly longer back story that I can fill in if you want with lots more detail but I don't think will add much to the following explanation A registered...

Very straight forward question but not sure why it seems so limited or I have lost my googling abilities..... There seems to be very few 25mm cores to go through a brick and block cavity wall circa 300mm.. The supply tails on the outdside hot and cold tap, which incorporate the valves, run back...

Hi All, Is there a effective, efficient way to go looking for a wiring fault tripping on downstairs lighting cct? Ideally, for me to go looking with a multi meter but otherwise, if I have to, an electrician with a proper testing machine..... Currently the cct is operating on an MCB. It is...

Fantastic. Yes 0059 is engineer access. Alarm Panel NO - bell box engineer hold off. Ok. Done. Ov to C. On the pgm 1 outputs in the panel, so jump it from B- terminal on bell wiring inside panel? Thanks so much for this. Feel it may have been easier to have got a pro in....

yes, I realised that as posting! The photo identified it for me!! The angle from underneath the bell box is not always easy to see the alignment!! incompetence really!!! Tks