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  1. J

    High Integrety CU - Internal cabling

    Yes, that would be a manufacturing advantage, but it doesn't alter the fact that I don't recall having seen a 'dual-RCD CU' (i.e. one in which, as factory-configured, all of the slots were supplied by bus bars from one or other of the RCDs) which had a third neutral bar... .... but maybe that's...
  2. J

    High Integrety CU - Internal cabling

    Maybe some dual RCDs have a third neutral bar, but I don't recall having seen that, and nor do I really understand why they would have done it - since, without 'mutilating' the CU (at least, it's bus bars), one can't have non-RCD circuits in a traditional dual RCD board.
  3. J

    High Integrety CU - Internal cabling

    Fair enough,but if yiou just talked about "modulo head screwdrivers",I wouldhave had a clue as to what you were talking about Yes,I'd be interested. Thanks. ... but how do these 'modulo head screws' differ from the things which we all know and love?
  4. J

    High Integrety CU - Internal cabling

    Fair enough - but it doesn't alter thee fact that I have never heard of them, nor any mention of them in discussions (real or 'virtual'),despitee the fact that, even here, there are quite often discussions about 'tools for electricians', and I've never heard them mentioned in any of those...
  5. J

    3 Phase Supply Conversion - Needed or OTT

    I don't think anyone has suggested that,have they? However,as for you question, I gather that many Estate Agents are now telling sellers that having an EV charger can appreciably increase the value of their property - so, if that is true, it might be one answer to your question!
  6. J

    3 Phase Supply Conversion - Needed or OTT

    Yes, I know that, but if people have other significant high power loads, they might not be too happy with their EV charging being 'slowed down'as a consequence. Whilst that's true, DNOs seem to be concerned about "maximum peak (i.e. instantaneous) demand", with minimal allowance for 'time...
  7. J

    3 Phase Supply Conversion - Needed or OTT

    It's not that many people need ';three phases' but, rather, that DNOs generally (always?) provide a maximum of a 100A single phase supply -so people get 3-phase if they 'need' more than 100A. That is going to become increasingly common because of EV charging - if coupled with electric cooking...
  8. J

    High Integrety CU - Internal cabling

    Maybe, but what sort of screwdrivers have most people (including electricians0 been using for 'device terminal screws' for all that time?
  9. J

    High Integrety CU - Internal cabling

    I don';t think it is - a dual-RCD board is a dual RCD board, and has two neutral bars (one for each RCD). This extraordinary term "high integrity board/CU' (don't ask me :-) ) seems to refer to a board which has two RCDs, but also has provision for a few (often only two) non-RCD circuits -...
  10. J

    Installing RCBO Query

    Are you now talking about something other than the possibility of 'borrowed neutrals' and the desirability of 'checking' for this before doing things that could result in circuits with borrowed neutrals ending up on different RCDs/RCBOs (a topic we did to death earlier in this thread). If you...
  11. J

    Installing RCBO Query

    Yes, and we've discussed that at length - and it's clearly an investigation that should be undertaken before the lighting circuits are moved to RCBOs. However, I wouldn't really call that Investigation 'testing 'in the usual sense, and I think it very likely that the 'testing' which markyd1...
  12. J

    Installing RCBO Query

    Well, obviously those circuits - but what 'tests'- and,as I implied,more to the point, what tests the results of which could conceivably alter as a result of changing MCBs to RCBOs? About the only relevant test after such a change would be to test the residual current functionality of the new...
  13. J

    High Integrety CU - Internal cabling

    Hmmm - I suspect that's a new one on a lot of us. ... so what type of head do the device terminal screws have - and why on earth aren't they a standard type,to correspond with the screwdrivers and bits which most people (I suspect including most electricians) actually have?
  14. J

    Installing RCBO Query

    If you feel such is how it should be, you are obviously free to post a comment about testing on Page 1 of every thread in which an OP is proposing to do anything to an electrical installation. It is, indeed,the case that, in theory, any electrical work should be followed by some 'testing', but...
  15. J

    Told I need to have Ze checked, an R1+R2 test, and possibly downrate a 40A fuse to 32A - any way to save money here?

    OK. Thanks. By my reckoning,10 metres of 6mm² cable (if that's what it is) would have an "R1+R2" (resistance of line plus earth) of about 0.127Ω, in which case the Zs measurement of 1.19Ω would imply a Ze of about 1.063Ω - which, even though a rough estimate, would seem to be much moire than...
  16. J

    Four electrical jobs in a kitchen - am I right?

    I can understand you finding it reassuring, but what some of us find strange (and far from reassuring) is that three different people are advocating the same approach which is somewhat uncommon/unusual, unnecessarily complicated (and costly) and electrically unnecessary
  17. J

    Why don't they......

    Ah - it must be my turn tio thank you for 'putting me right', theen :-) I do somewhat struggle to see how a quantity whose units include the word 'hour' can be thought of as "having nothing to do with time" :-)
  18. J

    Four electrical jobs in a kitchen - am I right?

    If you want the additional 'reassurance' of having 6mm² cable (even if 4mm² is probably 'technically OK'), if it would be easy to install new cables to create multiple circuits, it presumably would be at least as easy to change the 4mm² cable to 6mm² and then have just one 'cooker circuit', just...
  19. J

    Told I need to have Ze checked, an R1+R2 test, and possibly downrate a 40A fuse to 32A - any way to save money here?

    "No idea" is an exaggeration. As I wrote (in what you quoted) we know that the Ze is "appreciably lower than 1.19Ω", which I would say is a lot more than "no idea" - and if the OP could give us an estimate of the length of the (I imagine 6mm²) circuit, we could provide a much closer estimate of...
  20. J

    Why don't they......

    :-) ...but you were certainly right about "all day" !
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