Disconnection times

Discussion in 'Electricians' Talk' started by Alan sherriff, Jan 12, 2018 at 9:09 AM.

  1. leesparkykent

    leesparkykent Well-Known Member

    Cheers mate...I will do. Civil engineer/5WW ;) lol
  2. Coloumb

    Coloumb Well-Known Member

    I’m Bsc (Hons) ftw x
  3. leesparkykent

    leesparkykent Well-Known Member

    Cool ..... :confused:
  4. leesparkykent

    leesparkykent Well-Known Member

    Reading this again I've concluded that you must be very insecure, not very confident in your own abilities and feel threatened by me...otherwise you wouldn't have the urge to keep publicly stating how good you think you are. I personally have no need or desire to do the same...I suppose if you keep saying it and repeatedly expressing it to the forum, then you might end up believing your own hype. o_O
    Risteard likes this.
  5. Alan sherriff

    Alan sherriff Member

    Thanks for all your comments did a ze yesterday all bonds disconnected and sweated Earth on this tns supply and recorded .9 ohms which was raising my zs reading out of maximum disconnecting times of .4 seconds for 30 amp rewirble 3036, on the cooker circuit The original guestion was about old cooker installation and new amendment figures This could on a EICR makeing an installation unsatisfactory, but old disconnection times o/k within times when installed as the regs are not retrospective and results o/k at the time of installation
    Can not lower fuse wire rateing possible rewire all pvc cable I could beef cooker cable to 10 mill can not shorten cable run Have not tested sockets or lights as not contacted for that.Any way rcd board and 60898 breakers which will give me higher Zs just border line. And rcd to cover secondary shock protection And 32 amp c/b will let me use 5 second times for cooker. There are no service bonds so installed will drop mr zs reading price in for cooker rewire new rcd twin rcd and bonds £680 good price???
  6. JP.

    JP. Screwfix Select

    680 pounds is a very reasonable figure tbqh - obviously the customer will be presented with a cert upon completion of job. Excellent Alan.
  7. Risteard

    Risteard Well-Known Member

    Not sure how you read Lee's post given that you placed him on your "ignore" list last week. Technical error?
    leesparkykent likes this.
  8. unphased

    unphased Screwfix Select

    It still doesn't answer the question why the likes of Currys are getting involved in circuit testing as a prerequisite to deciding when they are allowed to connect a cooker?

    Anyway, Currys aside, there is an alternative solution to your dilemma. That is to get the main earthing system changed to PME. That would drop the Ze significantly and bring all your Zs readings down with it. I would explore that first before you go spending the customers money fudging the circuits. You are an electrician and as such should have thought about the PME possibility before embarking on all the other stuff you are contemplating.
  9. Bazza-spark

    Bazza-spark Well-Known Member

    Hi UP

    I believe it is a CYA issue. If they connect an appliance then later find there is a problem with the circuit, they can show the circuit was ok at the time of connection. If it isn't withing their prescribed parameters they will not coonect.

    Reduced insurance premiums maybe?

    Kind regards
  10. unphased

    unphased Screwfix Select

    But the issue IMHO, Bazza, is that Currys (and similar electrical appliance suppliers) are not qualified to test a circuit! They cannot,surely, train an employee just to test circuits in this manner and produce any meaningful result on which to base a decision whether to connect an appliance. I don't know what tester they use or what particular test they are requiring their delivery team to be carrying out but it is really no concern of theirs. They are treading on dodgy ground taking responsibility for testing a circuit and basing decisions as to whether an appliance can be safely connected? I think these appliance suppliers should be taken to task about it, I find it bizarre that they are even being allowed to do it. All they should simply require is that no responsibility can be accepted for connecting any appliances for customers and that customers should have the relevant circuit checked prior to the appliance being delivered. I really don't get why so many businesses get involved in things they have no experience to do so. Its laughable that Currys even offer a fitting service if they don't ultimately deliver that service to its proper conclusion.
  11. leesparkykent

    leesparkykent Well-Known Member

    I can't see why carrying out earth fault loop impedance testing could be seen as a bad thing. Yes they may occasionally get things wrong like when it's TT for example but I would say the pros outweigh the cons.
    Risteard likes this.
  12. Bazza-spark

    Bazza-spark Well-Known Member

    I completely agree UP. I can't comment on testgear etc as I don't know what they use or what training they are given, but obviously they must get some elementary training, unless they employ a spark to follow the delivery team round and make the connection to a "suitably tested and approved" circuit (my words, not theirs)>

    Kind regards
  13. Risteard

    Risteard Well-Known Member

    I believe they use a Socket and See type indicator. As with leesparkykent I certainly don't see that it is a bad thing that they do this. Obviously they are concerned that if someone received an electric shock from an appliance they had installed that they could be held liable. (It's not beyond possibility that their view is correct either.) Certainly they can make mistakes, however, through insufficient knowledge on the subject matter (e.g. TT systems as mentioned by Lee).
    WillyEckerslike likes this.

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