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How to Identify Home Network Type: TN-C, TT, TN-S, IT, TN-CS Networks Comparison

Luter89 57681 20
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How can I find out which electrical network type my home installation uses: TN-C, TT, TN-S, IT, or TN-CS?

You usually cannot determine the network type reliably from the house alone; the best sources are the utility company (ZE) and the connection/acceptance documentation [#5857347][#6033175] Call ZE or its documentation/development department and ask for the network system, and write down the date and name of the person who gives the answer because the information can be wrong [#5857347][#6033175] Check the energy supply contract, where the network type may be listed next to the ordered power, and also the plant design/receipt documents if you have them [#6030995][#6033175] If you know the transformer station or cable connector number/name, that can help ZE identify the feeder [#6033175] Do not rely only on socket wiring, an RCD, or the point where N and PE are bonded, because those are not always definitive [#6043512] The thread also warns that one station can feed different circuits with different systems, so a visual check at the installation may mislead you [#6033175]
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  • #1 5857290
    Luter89
    Level 11  
    Posts: 52
    Help: 1
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    Hello, I mean where does it say what network do I have at home?

    I am considering options for a TN-C or TT network and now I have a problem. TN-S, IT and TN-CS networks are definitely out of the question. How to check?
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  • #2 5857347
    Arturo2005
    Level 33  
    Posts: 1892
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    A phone call to ZE will do the trick
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  • #3 5857351
    Luter89
    Level 11  
    Posts: 52
    Help: 1
    Rate: 5
    And apart from the phone? Is there any other way? In some documentation?
  • #4 5857354
    Arturo2005
    Level 33  
    Posts: 1892
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    Do you have one?
  • #5 5857364
    koza18
    Level 14  
    Posts: 61
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    Rate: 43
    See on the energy supply contract, it should write next to the ordered power.
  • #6 5857366
    Luter89
    Level 11  
    Posts: 52
    Help: 1
    Rate: 5
    I have no idea I would have to look for papers at home. But I don't even know where something like this could be written, in what documentation.
  • #7 5857405
    marian_em
    Level 25  
    Posts: 843
    Help: 60
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    Go to the transformer, there is a sign with the name of the mains.
  • #8 6030995
    Tom$on_hh
    Level 11  
    Posts: 33
    Rate: 11
    Hello!
    Take a look at the contract with the power plant and the plant design. greetings
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  • #9 6031078
    stomat
    Level 39  
    Posts: 5600
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    In my opinion, you don't have a network at home. You are probably thinking of INSTALLING at home.
    If you have fuses on the L and N conductors, you have an installation in the TT system.
  • #10 6032011
    Tom$on_hh
    Level 11  
    Posts: 33
    Rate: 11
    stomat wrote:
    In my opinion, you don't have a network at home. You are probably thinking of INSTALLING at home.
    If you have fuses on the L and N conductors, you have an installation in the TT system.

    After the fuse on the N wire, I would not be sure. I met with installations done by idiots who put a fuse on the PEN wire in the TN-C network. greetings
  • #11 6032557
    junak63
    Level 12  
    Posts: 14
    Help: 1
    Rate: 2
    We are talking about a free-standing house or a flat
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  • #12 6033175
    janhen
    Level 22  
    Posts: 657
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    Hello
    Just like the one he gave above. first check the number and name of the transformer station, no. the last pole of the overhead line from which this building is supplied or the number of the cable connector if from the cable network.
    Call ZE, Documentation and Development Department for the name of the network chip in this network. Write down the date and surname of the person who provided the information, because it happens that the information provided is incorrect. If the documents regarding the receipt can be found, such information should be there.
    The name of the system is not always given on the LV distribution box. station provides information on all circuits of the LV network. I often see it that one network from a given station has a TN system and another circuit has a TT because it has not been modernized.
    It also happens that the modernized TN network (cable replacement) was made in the same way as in the TT system. There are installations in buildings
  • #13 6033213
    stomat
    Level 39  
    Posts: 5600
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    Do you think that it is so easy in the city to determine which station is powered by a specific connector?
    What the hell do you know what your shock protection system is, anyway? What do you need it for?
  • #14 6033444
    Akrzy74
    Rest in Peace
    Posts: 7910
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    The topic was certainly described, but I am interesting - as already col. Dent rightly noticed -
    Quote:
    What the hell do you know what your shock protection system is, anyway? What do you need it for?

    And
    Quote:
    In my opinion, you don't have a network at home. You are probably thinking of INSTALLING at home.

    Or maybe it's about the intelligence network / behind the closet, in the nooks and crannies :D , /

    Luter89 wrote-
    Quote:
    I am considering options for a TN-C or TT network and now I have a problem. TN-S, IT and TN-CS networks are definitely out of the question


    On what basis does the colleague say so firmly?
  • #15 6035001
    HINUŚ
    Level 16  
    Posts: 255
    Help: 13
    Rate: 28
    If it is TT, then every socket in the house would have to have a grounding point for the socket (receiver).
    If TN-C, after unscrewing the socket from the wall, the N wire will be connected to the protective pin.
    If TN-S, five wires will be connected to the counter board (3-phase installation) or otherwise, WLZ will be 5-wire (if it is a block)
    The IT system is completely eliminated, because it is not used in residential buildings, but, for example, in hospitals, military units, and all places with their own emergency power supply.
    TN-CS is only used in transmission networks.
    there is no installation in the apartment in the TN-CS system
  • #16 6035080
    Gump
    Level 12  
    Posts: 57
    Help: 2
    Rate: 8
    HINUŚ wrote:
    there is no installation in the apartment in the TN-CS system


    The author of the topic probably meant the TN-CS network :)

    Arturo2005 wrote:
    A phone call to ZE will do the trick


    And if not, then I recommend this link:

    http://pl.wikipedia.org/wiki/Uk%C5%82ad_sieciowy

    It seems to me that this should dispel any doubts :)

    greetings
    Gump
  • #17 6035242
    Łukasz-O
    Admin of electroenergetics
    Posts: 21783
    Help: 654
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    :arrow: HINUŚ You know they're calling, but you don't know which church.

    :arrow: Gump This link will help but not fix the problem.

    :arrow: Luther89 Your question was answered at the beginning of the topic. You can't check it yourself.
  • #18 6037911
    HINUŚ
    Level 16  
    Posts: 255
    Help: 13
    Rate: 28
    Lukasz just so happens that I know where the ring is, because I work in it ......
  • #19 6042708
    Łukasz-O
    Admin of electroenergetics
    Posts: 21783
    Help: 654
    Rate: 4278
    HINUŚ wrote:
    Lukasz just so happens that I know where the ring is, because I work in it ......


    Ok, but I think you got something wrong, explain it:
    Quote:
    TN-CS is only used in transmission networks.
    there is no installation in the apartment in the TN-CS system


    Next:
    Quote:
    If it is TT, then every socket in the house would have to have a grounding point for the socket (receiver).
    If TN-C, after unscrewing the socket from the wall, the N wire will be connected to the protective pin.

    It should be like that, but would you trust looking at the connections in the socket? After all, you are not sure what someone used to do with this installation.
  • #20 6043512
    Anonymous
    Anonymous  
  • #21 6043712
    Akrzy74
    Rest in Peace
    Posts: 7910
    Help: 363
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    Due to the fact that the interested person himself has not commented since the beginning of December, in my opinion he received an answer, and the topic itself has already reached the value of the topic that was already discussed on the forum> I close the topic. If there is a need - the topic will be unlocked.

Topic summary

✨ To identify the type of home network (TN-C, TT, TN-S, IT, TN-CS), users can take several approaches. A phone call to the energy supplier (ZE) is recommended for direct information. Additionally, checking the energy supply contract may reveal the network type next to the ordered power. Users can also inspect the transformer station for signs indicating the mains type. For installations, observing the fuses can provide clues: fuses on L and N conductors suggest a TT system, while a fuse on the PEN wire indicates a TN-C network. It's important to note that installations can vary, and documentation may not always clearly state the network type. In-depth analysis of the existing installation, including the presence of RCDs and how N and PE are connected, is also advised.
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