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  1. spark 68

    Metal CU in garage T.T system

    I am going to re-think and revise this, as I think probably GN8 might be on the over cautious side, I am going to have a closer look at some cable data where the SWA can be used as the CPC, and try to find some sensible calculations, but yes in GN8 it says that steel is 8.5 times less conductive...
  2. spark 68

    Metal CU in garage T.T system

    I gave up with most of those types of tables after that last thread lol :) , we used to use the division of 8, but after looking in GN8 where it suggests 8.5 I might have to revise this again, luckily I used an extra core where there was doubt, erring on the side of caution.
  3. spark 68

    Metal CU in garage T.T system

    that is over optimistic ;) steel is 8.5 X less conductive than copper according to GN8, 22 /8.5 gives around a copper equivalent of 2.5mm
  4. spark 68

    Metal CU in garage T.T system

    Hagar for one do a class 2 conversion kit for their metal clad boards for TT, Niccy say you can use an insulated gland and careful routing of the tails, or an upfront 100mA RCD or whatever where the EFLI is too high to disconnect the supply OCPD on TT.
  5. spark 68

    Metal CU in garage T.T system

    Be careful UK, I had a dubious table that gave over optimistic copper equivalent values lol :)
  6. spark 68

    Metal CU in garage T.T system

    On the other epic thread it turned out that the copper equivalent of 3C 6mm SWA was about 7.odd mm, this is 2C so even less.
  7. spark 68

    Metal CU in garage T.T system

    it doesn't lol :)
  8. spark 68

    Metal CU in garage T.T system

    Because the sub-main is only 6mm, and inadequate for MPB purposes, 10mm minimum required for TNC-S
  9. spark 68

    Metal CU in garage T.T system

    Ideally the TT CU should be class 2, another way is to add an upfront 100mA RCD before the metal CU and obviously the armourings not connected at the TT side, alternatively a suitable insulated gland as Archy pointed out above ^^^ might be enough.
  10. spark 68

    LUTRON homeworks QS panels

    I was thinking on the lines of the power input side may have a very different max Zs than the output side, I am not familiar with that particular product, is there any manufacturers guidelines ?
  11. spark 68

    LUTRON homeworks QS panels

    The dimming module may need C type protection at it's input, is the output protected or limited in anyway ? I was just thinking of a similar thread where the outputs were fused/protected by a 1A OCPD
  12. spark 68

    advice on steps

    ha ha I posted the acid cat up a while ago :) here is another cat one.
  13. IMG_26143598126040.jpeg

    IMG_26143598126040.jpeg

    • spark 68
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    • Category: Electrical Videos
  14. spark 68

    Garage Metalwork

    Right now we have established it is a separate electrical installation, I would follow Dave and E54s advice , also as I said in post #17 I speak from experience here :) lol as this happened to me a few years ago lol, luckily we had ducted the SWA cable, the DNO had updated the OH supply to...
  15. spark 68

    db marking

    I have seen some DBs marked in some odd ways, when we were panel building the project manager at one place wanted circuit 1 closest to the main switch,on the left, and circuit 2 on the right and so on, so you had all the odd numbers on the left and even on the right, ascending up over, but I...
  16. spark 68

    Garage Metalwork

    Well this is it, how are we supposed to advise without seeing the job, or at least a clear description ? It doesn't help that the building regs classification does not quite marry up with BS7671, it could be classed as integral or separate depending on which way you look at it, my gut feeling...
  17. spark 68

    Garage Metalwork

    Here in bold, now as to whether it is the type of garage with a doorway into the house is another matter ;)
  18. spark 68

    Garage Metalwork

    That is how I would treat it, the OP said it is integral, this is really no different to having a separate additional CU in any other room in the house. I would agree if the building was separate :)
  19. spark 68

    Garage Metalwork

    Would it though ?, if the garage is integral to the house (part of the same building). I would probably add the extra bond if it was easy enough to do, but would it actually require it ? I would personally say not in this case.
  20. spark 68

    Proving Your Neutral Electrical Connections

    Cannot comment on the Metrel My Megger requires the N for the No-trip test (three lead test) on the Hi-current test the N and E leads are connected together (effectively a two lead test), for testing ZP-N the Hi-current test would suffice because this would not trip any RCD.

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