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  1. J

    Electricity supply - Maximum Capacity of Connection 18 kVA

    Do you have an existing supply? If so could you post a photo? 17.21 kVA is 25A per phase on a three phase supply if the 17.21 kVA is the total 3 phase power. 17.21 kVA per phase would be circ 75A per phase. I suspect the figures are wrong, are they quoting for a single phase supply, or...
  2. J

    Electricity supply - Maximum Capacity of Connection 18 kVA

    Which makes it only circ 26A per phase, which appears somewhat low, hence why I think the figures aren't correct.
  3. J

    Query on recent Electrical Certification for property

    Yes, but it's clearly actually faulty wiring, rather than just being unable to bring the Zs in line. So I would class it as a C2 anyway - I suspect someone has changed a socket or something and not connected the CPC correctly.
  4. J

    Dodgy trade pictures for your amusement! - 1 Million Views!

    Eeek
  5. img_5_1685373475129-01.jpeg

    img_5_1685373475129-01.jpeg

    • Julie.
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  6. J

    Electricity supply - Maximum Capacity of Connection 18 kVA

    Are you sure about those figures? If it's a three phase supply as stated, then that's around 26A per phase If it's a single phase supply, which is more normal, that would be circ 80A If it is three phase, is it 18kVA per phase (so 80A each phase) Do you have a photo of your...
  7. J

    Query on recent Electrical Certification for property

    In his point 2 he mentions two things, ir at 0.0 (which is wrong) and the high Zs - he doesn't mention the value here, but it is in the table of test results under "measured Zs" at 2.49 ohm. This must be less than 1.1 ohm (max permitted Zs) for this circuit, which it isn't hence the high Zs...
  8. J

    Query on recent Electrical Certification for property

    Yes, exactly as you found. Although actually since amendment 2 there is actually no requirement to do these tests as we used to, but it passes in any case
  9. J

    Query on recent Electrical Certification for property

    He does it's squirreled away in item 2 - Zs is to (sic) high
  10. J

    Query on recent Electrical Certification for property

    OK, from the report there looks to be some valid items, others I would disagree with. 1 - I would really need a photo of the garage board to comment, but even if it isn't glanded properly, providing there is proper connectivity and it achives the level of ingress protection, that would look...
  11. J

    Query on recent Electrical Certification for property

    Could you post the report with the addresses, names and other identifying details removed, without seeing what was actually said we can't really comment accurately
  12. J

    I want to know what good for is that Bandwidth in a DSO

    No idea, they are both very cheap handheld 'scopes. Given their availability from many different suppliers, you may not get an original anyway, and therefore the item you buy probably doesn't go close to matching the specifications. Best to look out for reviews
  13. J

    Does anyone know what RCD fault he is talking about

    Agree, I found his "presentation" awful, and struggled to keep watching. Passing information to his audience is most certainly not his forte! To the OP - as James stated, although there may be some tips that come out of these videos, there is so much more dross and potentially dangerous...
  14. J

    EICR question, OLD AC RCD- code 3 or no code?

    Absolutely - in just the same way when we find an installation that has the old black and red colours - due to regulatory changes we also must highlight this as a C3 - Improvement Recommended. After all if the regulations do change making previously acceptable aspects no longer compliant...
  15. J

    Breaking capacity of MCBs

    Yes there is a difference between the two, unfortunately the info in the MCB, and fuse manufacturer's data isn't always clear - so I just kept it simple, if I was doing the checking myself I would ensure I got the data. Especially the actual peak Asymmetrical to rms symmetrical ratio of the...
  16. J

    Breaking capacity of MCBs

    Hopefully this link will work https://www.lawsonfuses.com/app/uploads/2021/09/ME-MF-Datasheets.pdf
  17. J

    Breaking capacity of MCBs

    It's from the lawson LV fuse catalogue. It's too big to upload, but here is another catalogue showing the same sort of curves...
  18. J

    Breaking capacity of MCBs

    A PFC higher than the breaking capacity of the MCB/MCCB isn’t always an issue. If there are fuses at the incomer, these do have the ability to limit the current. The term perspective fault current is that level of current that would flow if nothing interrupted the current. If there is a high...
  19. Screenshot_20230331-213728_OfficeSuite.jpg

    Screenshot_20230331-213728_OfficeSuite.jpg

    • Julie.
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  20. J

    Does this install need a rewire as suggested?

    The form used for the report is the old version, the current regs are the 18th edition ammendment 2 and this has a different form/certificate to the one he used.

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