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"17 edition"consumer units still being sold.

hertzal123
After watching a webinar describing the dangers of using dual rcd cu,s with type AC rcd supplying dishwashers,induction hobs etc,

I was wondering why,more than 12months after 18th came into force,they are still for sale.Thanks for any opinions.

                                                                                                          Regards,Hz

  • 0
    Well if you are going to go “over the top” it won’t be achieved at the discretion of electrical contractors. They are very much price-driven and less likely to consider the technical nuances of RCDs, especially on the domestic front. So if consumer units populated with type AC RCDs are for sale legitimately, then whilst they remain cheaper, they will be legitimately installed.
  • 0

    NOMBRE D’INTERRUPTEURS DIFFÉRENTIELS ET RÉPARTITION DES CIRCUITS 


    norme protection personnes 01 700x700
  • 0
    If you have a look at Legrand France you will soon realise that the French don’t have an issue with installing new consumer units with Type AC RCDs in them, they do however install Type A RCDs when it is appropriate.


    Installing all Type A RCDs may seem a good idea to future proof the installation, but will it ever need a Type A on the lighting circuits? If there’s no cost difference then maybe there is no advantage in installing different types of RCDs, so is it the French being sensible or the British going OTT  when making their choice of RCD?


    So as far as the French are concerned so long as at least one RCD in the consumer unit is a Type A the jobs a good un!


    Andy Betteridge
  • 0
    Andy, why are you picking on TT installations?

    Just because it seemed an obvious, fairly common, situation where we are quite dependent on the correct operation of RCDs for safety. As I said in my earlier post the fault might be cleared by large overcurrents on non-TT system so I was just looking for a solution for the remaining problem. Half a solution isn't really a solution after all.

     
    I would be most interested to see the data, which is always missing with such arguments.

    While I don't entirely disagree about basing decisions on evidence, when things are continually changing (e.g. the nature of loads) I think there is justification for using engineering judgement to anticipate problems too. If we just waited until there was a pile of 100 bodies, the industry would have to explain to 100 families why their loved ones had to perish even though it was "known" that the risks where there and means of prevention might have been available. We might have got away with such an attitude in Victorian times, but I doubt that 21st century culture would be quite so understanding.


       - Andy.
  • 0
    This man cites several everyday A.C. examples of why an R.C.D. can have a saturated core and not work correctly.

    https://www.youtube.com/watch?v=9qX89cPGgp4



    Z.
  • 0
    The most interesting thing in that video is the test jig is the same as used by another person in another video. I deduce that someone is pushing an agenda, and I would like the "who" to be revealed. If it is a manufacturer (again!) then we should at least know who and be able to ask questions as to why, and evidence should be fully forthcoming. We are already suffering for one incident of this type (AFDDs), and this could be another.
  • 0
    Sparkingchip:

    NOMBRE D’INTERRUPTEURS DIFFÉRENTIELS ET RÉPARTITION DES CIRCUITS 


    norme protection personnes 01 700x700





    I am awaiting a comment from the observant. 


    Andy Betteridge 


  • 0
    davezawadi:

    The most interesting thing in that video is the test jig is the same as used by another person in another video. I deduce that someone is pushing an agenda, and I would like the "who" to be revealed. If it is a manufacturer (again!) then we should at least know who and be able to ask questions as to why, and evidence should be fully forthcoming. We are already suffering for one incident of this type (AFDDs), and this could be another.


    Yes Dave the test rig is professionally made. I wonder if the maker's name on the R.C.C.B. and M.C.B. in green writing gives a clue?


    Z.


  • 0
    Some of these new Type A R.C.D.s need a quarter of an Amp to get them to operate swiftly.

    https://www.youtube.com/watch?v=c0dPUf_aZ4E


    Z.
  • 0
    I am awaiting a comment from the observant.

    Symbols for the A and AC types are the wrong way around?

        - Andy.

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