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One phase is missing in the house in a three-phase system.

Sokol1922 34065 18
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 15057495
    Sokol1922
    Level 8  
    Hello,
    I will mention right away that I have very little knowledge of electricity, which is enough to connect a socket at home or lighting. Going to the topic, recently in my box outside, the wires were mixed up ("someone" tried to connect a power welder there, some wire fell out of him and he did not know where to put it and everything fell down). Well, there are three phases coming from the pole, one output phase and grounding. There are two houses in the yard - one has always been attached to one phase and ours to two. And here the problem begins, you know (I hope I am thinking correctly) I connect two output cables from both houses to the cable going to the pole and the ground to ground. In this way, we are left with three wires - two to one house and one to the other. And here the stairs begin, so we have strength in the house, that is, three wires should go to us (this is also the case in the home box), not two, as shown by the box outside. The problem is that the electricity in our house is only downstairs - there is no upstairs (I suspect it's a phase). Help, how can I connect these wires so that everything is fine - in the box there are two phases - black cable and brown, and only black to the other house? (when an electrician connected it, he said that the current is not the same in every phase? What is it about?).
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  • #2 15057517
    jacekko63
    Level 31  
    If the house has a three-phase installation, three phases must be connected. If you don't know each other, call a good specialist before you burn something or worse, someone will be electrocuted.
  • #3 15057522
    Sokol1922
    Level 8  
    How is it possible with only two wires going? Probably the one from the other house also comes to us.
    What should I set on fire by changing the order of the phase wires?
  • #4 15057547
    jacekko63
    Level 31  
    If you change the phase with the neutral by mistake, if you know, you know that for a three-phase installation you need four (TNC) or five (TNS) wires.
  • #5 15057589
    Topolski Mirosław
    Moderator of Electrical engineering
    jacekko63 wrote:
    If you change the phase with the neutral by mistake, if you know, you know that for a three-phase installation you need four (TNC) or five (TNS) wires.

    And with TT how many wires will there be?
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  • #6 15057604
    Sokol1922
    Level 8  
    I will not change the phase with the neutral, I wrote with it already. Now I have a phase connected - brown, black, black. There is electricity in one house, only downstairs with us. How it's possible? There is electricity in each phase because I checked, but it is not reaching us. It is possible (it was short-circuited earlier) that something burned somewhere?
  • #7 15057690
    Topolski Mirosław
    Moderator of Electrical engineering
    Without being on site, you can only provide the probable place of failure, but for a person with little knowledge, the information may be dangerous to himself or other people, therefore it is advisable to call a qualified electrician and he will deal with the problem very quickly on the spot.
  • #8 15057730
    elvis13
    Level 18  
    Burning of devices in a three-phase installation may occur when the neutral conductor is disconnected first, for example.

    The order of connecting the wires:
    protective conductor
    neutral wire
    phase conductors

    The order of disconnection is reverse.

    In an installation where there is "zeroing", disconnecting the neutral wire (not observing the order) may lead to electric shock and fire hazard.
  • #9 15057875
    elpapiotr
    Electrician specialist
    dules wrote:
    The wires should be connected by colors, where brown and black are the phases, blue to the neutral N strip, and yellow-green to the PE strip (called grounding. The phases are connected to the fuses.

    Don't be surprised, buddy -

    One phase is missing in the house in a three-phase system.

    Most of these conductors have a color of ... brown PE.
  • #10 15057977
    Sokol1922
    Level 8  
    Hmm, I opened the box in the house and, to my surprise, there were three cables connected to the house's power supply - brown, black and yellow green! - which obviously had no electricity (it was not buried there). In the outside box, the yellow-blue is now connected as ground. Now a thought is born that one of the cables in my house, which theoretically functions as a ground, is connected to some phase outside. Is it dangerous? How can I check which wire that is connected outside is the one from ground? (because he speculates that this yellow and blue is not anymore; /)
  • #11 15057992
    haneb
    Level 24  
    Take photos, some diagram because it is difficult to deduce anything from these descriptions.
  • #12 15058220
    Joker.
    Level 31  
    Sokol1922 wrote:
    ... I connect to the cable coming out to the pole ...

    Will it not be illegal energy consumption then? Where is the energy meter?
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  • #13 15058292
    O^O
    Level 21  
    You advise a layman who has no idea about electricity, but has something obviously buried in the installation.
    For the sake of safety, a visit by an electrician is recommended!
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  • #14 15058392
    Sokol1922
    Level 8  
    Take it easy, my friend, I don't steal anything. This is how it looks outside, theoretically good, but at home there is such a web of cables that you won't see anything from the photo.
    One phase is missing in the house in a three-phase system.

    Added after 2 [minutes]:

    If it was up to me, the electrician would be yesterday, unfortunately the higher force claims that he can handle it.
  • #15 15058415
    O^O
    Level 21  
    Sokol1922 wrote:
    If it was up to me, the electrician would be yesterday, unfortunately the higher force claims that he can handle it.
    It remains to wish this force a greater success, because it is impossible to connect 3 phases, N and PE, with a 4-wire cable.
  • #16 15058422
    Sokol1922
    Level 8  
    I will only add that at home this yellow and blue one was connected to the power supply of one phase in the fuse, this is the one disconnected at the bottom.

    One phase is missing in the house in a three-phase system.
    Added after 45 [seconds]:

    But before that, everything was fine ...
  • #17 15058432
    O^O
    Level 21  
    A beautiful picture of bungling and incompetence, which only confirms my belief that an electrician should arrive on the spot and bring the installation to order.
    Sokol1922 wrote:
    But before that, everything was fine ...
    It wasn't good. The light was shining, but that doesn't mean it was okay.
  • Helpful post
    #18 15058473
    kozi966
    Moderator of Electricians group
    Sokol1922 wrote:
    theoretically good

    In what theory? In my opinion, it is not good.
    Not only the ankle is probably of the wrong amperage, but also the veins are damaged.

    As for what's in this switchboard at home, it's a tragedy. This is all to be improved. Here, even from the photo, you will not deduce why something is not working.

    Electrician visiting yesterday.
  • #19 15058876
    retrofood
    VIP Meritorious for electroda.pl
    And that's all there is to it. The status of the installation indicates a serious risk to users, no half or a quarter measures will help. A complete overview of the entire installation is essential!

    I close.

Topic summary

The discussion revolves around a three-phase electrical system in a residential setting where one phase is missing. The user describes a situation where wires were mixed up during an attempt to connect a power welder, leading to confusion about the correct wiring configuration. Responses emphasize the necessity of having three phases connected for proper operation and warn against the dangers of incorrect wiring, such as potential electric shock and fire hazards. Several participants recommend consulting a qualified electrician due to the complexity and risks involved. The user also expresses concern about the possibility of a ground wire being incorrectly connected to a phase, raising safety issues. Overall, the consensus is that a thorough inspection and correction by a professional is essential to ensure safety and functionality.
Summary generated by the language model.
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