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  1. P

    High Zs on a Campsite

    The question of the VD on the distribution circuit also should take in to account the sort of final circuit VD values in the end block, as the goal should be under 5% for the whole lot. If it is feeding a relatively small block where you can size the final circuits for 1% drop, etc, then...
  2. P

    rewiring 1970's electricals

    How did it go?
  3. P

    Any advice on rewires?

    Try it with uBlock Origin as an extension, you might be pleasantly surprised.
  4. P

    What has happened to Schneider fused-switches?

    The previous ones I have used were UK
  5. P

    PAT testing courses

    Just for in-house equipment. It is a mixture of reasons. One client is wanting use to be ISO-9001 QA certified in due course, so stuff like this helps, and also I think it is good for moral if you send folks on courses to get some professional development, etc, from time to time. We have the...
  6. P

    Serious Reader

    According to the web site: Our Alex Light uses Daylight Wavelength Technology™ to replicate the makeup of natural daylight. This bespoke technology provides your eyes with the help they need to focus for longer and see more clearly. So it seems they are charging a lot for a bulb that claims to...
  7. P

    Type S RCD Polarity Clarification

    Yes, it seems the RCD is symmetric in both ways so it could be used like you show. However, would it not be better to take the supply from the busbar via your 50A MCB and then you can wire the delay RCD up the normal L/N way? Top/bottom feed is immaterial here as the MI says, however, keeping...
  8. P

    Can we connect the 2 phases lines ( 110 V each ) to RCD breaker?

    But those two poles would, ideally, sum to zero the same way 3P bolted fault would, or indeed 2P+N would. My point is you will never see such perfect balance on any real-world fault to earth that would not have a fraction of an amp error to trip the RCD, should it be needed for protection (i.e...
  9. P

    RING MAIN CONFUSION

    They ought to be able to check for the voltage going completely off using one MCB off at a time to confirm that. That would be my assumption, that the multiple points must be on some segment that is not part of the RFC end-end r1/r2/rN test.
  10. P

    Can we connect the 2 phases lines ( 110 V each ) to RCD breaker?

    Meanwhile in reality if you have a bolted fault to E (with 3P or 2P+N supply) that theoretically gives you zero imbalance due to line voltages summing to zero, in practice you ain't going to see such exquisite balance that fault has not got 30mA or whatever spare to trip the RCD. Assuming such...
  11. P

    Can we connect the 2 phases lines ( 110 V each ) to RCD breaker?

    You need to tell us a lot more, or a drawing! Is this a 110v-0v-110v two/split phase supply? Is the load only ever phase-phase, or is there a neutral involved?
  12. P

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

    Creative adaptation of a 13A plug:
  13. creative-plug.jpg

    creative-plug.jpg

    • pc1966
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  14. P

    What has happened to Schneider fused-switches?

    Still, if it you just had stuff clogged up in transit why remove all reference to it from your web site?
  15. P

    What has happened to Schneider fused-switches?

    I was looking for the likes of the SQB1603K and see it is out of stock at CEF and no delivery option available. Odd. Then I search for the part on the Schneider web site and it has gone, other than a couple of FAQ. I has a chat person and get this somewhat weasel-worded explanation...
  16. P

    Megger MFT1720

    If varies. CEF do an occasional calibration day where you drop it off the day before or very early, and collect end of day/next day for £25+VAT per item, some cost more in the 50-70 sort of range.
  17. P

    PAT testing courses

    Yes, we all know it is In-Service Inspection and Testing of Electrical Equipment now... We are thinking of sending our technician on a course to get some formal accreditation in this. We have a Seaward 100 (that our now-retired technician used at our previous place), and they can work their way...
  18. P

    Megger MFT1720

    If they actually will accept a return then probably worth trying. Just check how long you get to decide, as calibration might be several days depending on who/where it is done. Do you have spare leads and a CalCard to do a simple check? Those are worth buying even if you get another MFT that...
  19. P

    Anyone around hackney : Job sorting out poor light connections in loft .

    Someone will reel it in sooner or later :)
  20. P

    Virtual tour of supercomputer building

    It has some advantages for those who work there, my fried has 2PB free space in his home directory! Yes, that is petabytes, so 1024 * TB (or less, if you are disk drive maker when you use 1000 multiples instead of 2^10 as computer folks do).

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