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  1. J

    LED brightness question

    see (here) .... . I haven't hunted through all the products, but there are items like ... Kind Regards, John
  2. J

    LED brightness question

    I know you were, but that doesn't alter my belief that you would probably be confusing some people. That's only true for those (like you) who have got it into their heads that, despite the decades during which this hasn't been the case, a "driver" is now necessarily a constant-current source...
  3. J

    LED brightness question

    I think you may well confuse some people with that statement. Yes, in relation to any piece of electrical/electronic equipment (including an "LED lamp", or a string of LED elements) it is obviously crucial that the power supply is appropriate for ("acceptable to") the equipment - in terms of...
  4. J

    LED brightness question

    If you changed "incorrect" to something like "unclear" or "ambiguous" then I would totally agree with you. However, as often discussed, if a particular use of language becomes sufficiently "deeply entrenched" and in very widespread use, then one has to question whether it really is sensible to...
  5. J

    Confused about a rewire.

    Sure, there can be no certainties but, for what it's worth, my personal suspicion is that differences between older and newer PVC cables are unlikely to impact the life expectancy of fixed wiring cables which are virtually never 'disturbed' and very often (literally) 'never see the light of...
  6. J

    Confused about a rewire.

    Fair enough, but .... That's the point. The context of this discussion is in relation to the 'fixed wiring' cables of an installation, and they are not subjected to "constant coiling/twisting etc." or any other form of mechanical disturbance/stress and are rarely subjected to UV radiation (and...
  7. J

    Confused about a rewire.

    Quite. Indeed, as I've reported before, a few years ago I took out of service (for no reason other than that I had 'found it'!) some early PVC cable (30m or so) that had been buried directly (without any protection) in my garden for at least 40 years, probably a lot more, and was,both visually...
  8. J

    LED brightness question

    As I recently wrote, I don't understand why some people seem to have got it into their heads that the general term "driver" (and, in context, specifically "LED driver") relates specifically and only to drivers which are constant-current sources. In the following, note that the search term is in...
  9. J

    LED brightness question

    Friday evening :-) I would personally say that, in the context of electronics, the word "driver" always has been (and probably always will be) a very general one which (as in the dictionary definition you have quoted) merely refers to something whose output was used as the input to something...
  10. J

    Safety issue? Replace.

    It' physically broken/damaged - is that not an adequate explanation as to why it obviously needs to be replaced? See above. We're talking about common sense here - not regs or inspections! Kind Regards, John
  11. J

    Indicator for outside lights

    The contents of my (many!) junk boxes which also may (or may not!) be useful one day also don't help. However, the OP has now got at least two simple solutions (DP switches or diodes) which don't require a CT! Kind Regards, John
  12. J

    RCD tripping. TT. where could be the fault? (FIRE ALARM SENSOR)

    It's obviously great if you have cured your problem, but I have to say that I don't really understand how this can have occurred. I thought (maybe wrongly?) that mains-powered smoke sensors/detectors were 'Class II' ('Double-Insulated') and therefore did not have an earth connection (although...
  13. J

    RCD tripping. TT. where could be the fault? (FIRE ALARM SENSOR)

    Are you saying that, having found this, you have determined that it was the cause of your RCD trips, and that you therefore have "fixed" the problem? Kind Regards, John
  14. J

    Containment for island electrical points

    You're welcome, and I don't think that you have 'caused any trouble' at all! Kind Regards, John
  15. J

    Containment for island electrical points

    Not OK, even under Amendment 2 - 1.5mm cable in conduit only has a CCC of 16.5A Kind Regards, John
  16. J

    Containment for island electrical points

    Thanks. That's what I suspected might be the case, and I don't know where all the talk about "within an insulated concrete floor" came from. ... which I think takes us back to 2.5mm² cable, after all the distractions :-) Kind Regards, John
  17. J

    Containment for island electrical points

    There will, but it is, in my opinion, to even start one's calculations when one doesn't know how the cableis to be installed (but now we do - and it seems that my doubts {that they were necessarily in an 'insulated concrete floor were very justified :)) is pretty foolish! Whilst that may be...
  18. J

    Containment for island electrical points

    It's a little odd that BS7671 does not explicitly include installation methods for cables in conduit under/within floors. As I've just written to Sunray, I don't think we know for certain that it is a concrete floor, nor, if it is, to what extent it is 'insulated' - I would not have thought...
  19. J

    Containment for island electrical points

    Although you may well be right, I think you're also guessing that it is a concrete floor in the first place. See also the reply I'm abot to write to bernard (to whom my question was directed. Kind Regards, John
  20. J

    Containment for island electrical points

    The calculation you present shows that 4mm² cable would be required if the cable were installed using 'Method A' (enclosed in conduit in a thermally insulating wall). Why did you choose that installation method for your calculation? Kind Regards, John
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