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  1. L

    UK Different test results after DB change

    My money is on this possibility or something similar. For instance, we have recently had to carry out testing on premises that were dormant/vacant for 2 years (covid related). A number of FLi socket circuit tests were marginally higher than the regs allowed. I did wonder why the installation had...
  2. L

    UK Earth to Live Voltage - 206v

    Is the supply system.TNC-S or TT?
  3. L

    Equipotential Bond Current showing on Clamp meter earthing

    By "main earth" you are probably referring to the earth going to the rod?? Australia has a TNC-S system. That means you can end up with current flowing in any bonded metalwork because its connected directly to the neutral. You won't get any current (nothing measurable anyway) flowing to earth...
  4. L

    Gas meter with plastic supply pipe - earth bonding worthless?

    There is no benefit in bonding a gas meter that's installed as you describe above. I cannot explain why its still done.
  5. L

    Earth leakage clamp meter

    Can I ask how much "additional cost" comes to in euro, s and what particular brand caught your eye.? I also want to get one with the capacity for measuring DC leakage
  6. L

    Bathroom zones and ip ratings

    I support that conclusion 100%.I also comepletly understand the reticence of the other posters. Afterall the message that wall switches in bathrooms place the user in mortal danger continues to be preached to every electrical apprentice from day one. That's the same apprentice who will travel...
  7. L

    Laptop Power Supplies Trip RCD

    I suspect there is, nt anything "wrong" per say. Inrush current is a feature of every electrical circuit. The natural leakage built in to the appliances you are using will also experience a momentary spike when initially plugged in. Usually rcd, s can cope with this but in your case there is...
  8. L

    4 mm Cooker circuit 32amp MCB

    Never. First observation is that it's unlikely it was installed by a conventionally trained electrician.A cooker should have its own circuit. Most countries would require it (can, t speak for UK) And if it is allowed, it is terribly poor design. . Next obvious question is... Is it...
  9. L

    UK Rcd tripping, 77v on earth bar

    Correct. And it's likely from your description that all is in fact in order. You are getting readings currently that are confusing for you, which is understandable. To "unconfuse" the situation bear in mind that what you are there to actually test is the "fixed wiring". In principle this means...
  10. L

    Rcbo trips when it rains heavily

    You have 50% of your solution right there. I would be keeping my IR tester in its box and first determine exactly what's on that circuit that might be affected by rain. Its usually something exposed to the elements. As a general rule you want to disconnect as little as possible during...
  11. L

    Rcbo trips when it rains heavily

  12. L

    Groundwire sparked while connecting it to the main ground

    Out of curiosity, what kind of supply system do you have in Belgium? TNC-S or TT?
  13. L

    Groundwire sparked while connecting it to the main ground

    Firstly the "differential" (rcd) will only trip when's its rated leakage current is exceeded (30 ma). Any appliance which has intentional leakage in its design will "spark" if you disconnect or reconnect its circuit CPC but will not trip the rcd as the intentional leakage is designed to be...
  14. L

    What are the dangers of poor insulation resistance results between neutral and earth?

    1 Meg is actually allowable. The problem is that it is highly unusual to get a reading like that in the fixed wiring of a standard installation. It's highly likely that there is something connected in circuit that's dragging down the reading. And until you find out what it is, it can be vexing
  15. L

    Fault on lighting circuit

    There is almost certainly leakage from live to earth. But what kind of leakage is it? Intentional or unintentional? If it was a socket circuit I would regard your issue, s as nothing unusual. Remove the CPC from your average ring circuit and you will almost certainly measure a significant...
  16. L

    Does this need to be bonded?

    No. Your marbles are very much where they are meant to be. But if I may offer my final comment on this post, it's this. Bonding as a topic is the "gift that keeps on giving" from the point of view that since I, ve been an apprentice no other single electrical subject has caused me more "head...
  17. L

    Does this need to be bonded?

    10ma been the threshold for "no let go" is new for me. I had always being led to believe it was 16milli amp.A very Interesting read indeed.
  18. L

    Does this need to be bonded?

    Won't download for me. What's the doc called?. I can Google it If simultaneousely accessible and class 1 accessories are used then that changes the scenario significantly. But I understand that previous posts established that the metal posts were not simultaneousely accessible.
  19. L

    Does this need to be bonded?

    Thanks. And sorry to hear you are having such a stressful afternoon šŸ˜
  20. L

    Does this need to be bonded?

    So which of the above figures would be regarded as the cut off point for when something is regarded as extraneous?. There is quite a gap between 7.67 and 22 Kohm.

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