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Distributor's Box Wiring: Bridging PE with N or Creating Additional Grounding?

Piotrekh75 34458 41
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #31 15911291
    Łukasz-O
    Admin of electroenergetics  
    kkas12 wrote:
    Where did your friend read that?

    Probably in terms issued by ZE :D
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  • #32 15911447
    Karamba2014
    Level 9  
    Sorry, I misread some literature, after checking a few sites on the internet, it comes out below 10 ohms
  • #33 15911478
    kkas12
    Level 43  
    Quote:
    ...after checking several websites on the internet, it comes out below 10 ohms
    Can you tell me what pages these are?

    And we don't write below 10 ohms but below 10 ohms !
    Please correct!
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  • #35 15911646
    kkas12
    Level 43  
    You chose very badly my friend.
    That message somehow escaped the moderators and survived.
    However, an electrician cannot base his knowledge only on what he finds on the forums.
    However, there are other messages in this forum as well. There are standards 4-41 - 7-704 mentioned in them and they should be based on them.
    And there are no such requirements.
    So put this value of 10 ohms between fairy tales.
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  • #36 15911709
    MARCIN.SLASK
    Home appliances specialist  
    Maybe this will help:
    Distributor's Box Wiring: Bridging PE with N or Creating Additional Grounding?
    Distributor's Box Wiring: Bridging PE with N or Creating Additional Grounding?
    Distributor's Box Wiring: Bridging PE with N or Creating Additional Grounding?
  • #37 15911728
    Łukasz-O
    Admin of electroenergetics  
    It's just all taken out of context.
  • #38 15911805
    MARCIN.SLASK
    Home appliances specialist  
    The resistance should be low enough to ensure tripping in 400ms (0.4s) with protection not greater than 32A.
    For construction sites, increased requirements can be used: switch-off time max. 200ms (0.2s) at max. 25VAC touch voltage.
  • #39 15911825
    kkas12
    Level 43  
    We are talking about the TN system.
    Will the lack of earthing of the PE bus cause that SWZ will not occur?
    Will the earth electrode improve the parameters of the all-metallic fault loop?

    Please remember that this is a section for beginners and in this section we also require independent thinking from those who ask questions.
    So please don't advise. The more that the hints are not true.
  • #40 15911857
    MARCIN.SLASK
    Home appliances specialist  
    kkas12 wrote:
    We are talking about the TN system.
    Will the lack of earthing of the PE bus cause that SWZ will not occur?
    Will the earth electrode improve the parameters of the all-metallic fault loop?

    Please remember that this is a section for beginners and in this section we also require independent thinking from those who ask questions.
    So please don't advise. The more that the hints are not true.


    1: Under normal conditions, the SWZ will occur, because the ZE is to ensure the continuity of the PEN conductor (but there are also known conditions other than normal, e.g. a tree branch damages this conductor).
    2. Yes, but not much/slightly. Often there is a 100-fold difference between these resistances/impedances.
  • #41 15912132
    kkas12
    Level 43  
    It won't improve anything. And when the PEN is interrupted, the role of the grounding is different.
    But that has been explained many times before.
    For electric shock protection (recipient), the resistance of (its) earthing is irrelevant.
    There is a 7-704 sheet for construction sites and it should be adhered to and not made up.
    And if that's not enough for someone, let them use the solution from the islands.
    Also in the above standard it is presented and not a 10-ohm resistance.
  • #42 15912176
    TWK
    Electrician specialist  
    MARCIN.SLASK wrote:
    Maybe this will help:
    The first drawing is a network standard, not an installation...
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Topic summary

The discussion revolves around the proper grounding methods for a construction distributor's box that provides three-phase power and neutral but lacks a dedicated ground line. Participants emphasize the importance of adhering to connection conditions and the necessity of protective earthing (PE) to ensure safety. The use of a PEN conductor, which serves dual functions as a protective earth and neutral, is debated, with recommendations for proper cross-section sizes (10mm² for copper, 16mm² for aluminum). The need for a residual current device (RCD) is highlighted, and the significance of measuring grounding resistance is discussed, with a target of below 10 ohms for effective protection. The conversation also touches on the implications of different network systems (TN-C, TN-S) and the importance of hiring qualified electricians for installation and measurement tasks.
Summary generated by the language model.
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