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Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining

ixs 71967 40
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How should I professionally connect pass-through sockets when three 3x2.5 mm² cables enter one socket and three more continue to the next socket?

Najbezpieczniej zrobić rozgałęzienie w puszce na złączkach typu WAGO / trójnikach, a do samego gniazda doprowadzić krótki odcinek przewodu 2,5 mm²; jeśli gniazdo ma dobre zaciski, można też podłączyć przewody bezpośrednio do styków gniazda, ale trzeba je solidnie dokręcić [#14233389][#14234357][#14234795] Przy takim układzie problemem są zwykle zaciski gniazda, nie sam przewód, dlatego warto używać porządnych osprzętów z zaciskami śrubowymi / podwójnymi i poprawnie uformować przewody przed wsunięciem w puszkę [#14234357][#14236738] Do gniazd nie należy robić „odgałęzienia” przewodem 1,5 mm² zasilającym gniazdo, bo to jest niezgodne ze sztuką; obwód gniazdowy powinien pozostać na 2,5 mm² [#17664274][#17664496] Jeśli brakuje miejsca, trzeba użyć głębszej puszki lub osprzętu z szybkozłączkami, ale połączenie musi być pewne mechanicznie i elektrycznie, bez luźnych żył w zacisku [#14233362][#14234795]
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  • #1 14233304
    ixs
    Level 16  
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    Probably a trivial matter, but I wonder how it should be professionally connected ..
    It is about pass-through sockets - on one side there are 3 power cords - on the other side there are 3 wires for the next socket. How to connect them to the socket and let the electricity go on (connect 2 wires on the screws in the socket, are there any cubes or other way ...)

    So far, I have always dealt with installations that the main box was above the socket under the ceiling, from where the electricity went on and one wire for each connection was connected in the socket ..)
    In such an arrangement of pass-through sockets, I would not like to lose power on the contacts (the wires are 3x2.5 - if I connect to the socket contacts, then going through the next sockets will not be a big loss - the wire contact on the screws is not too large - if any wire is loosened, it can heat up. on the contacts - it is not even known in which socket ...)
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  • #2 14233362
    kacper62
    Level 12  
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    Of course, on the contacts in the socket. With 2.5 mm cables it will be hard (it also depends on the socket manufacturer).
  • #3 14233389
    Anonymous
    Anonymous  
  • #4 14233410
    ixs
    Level 16  
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    And what sockets do you recommend to connect well?

    Maybe there are some sockets with built-in WAGO connectors instead of screws?
  • #5 14233474
    Anonymous
    Anonymous  
  • #6 14233534
    Anonymous
    Anonymous  
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  • #7 14234357
    zdzisiek1979
    Level 39  
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    I always use socket clamps and after mounting the frame, I tighten the screws before installing the sign and there is a guitar guitar.
    A double screw socket on the plug terminal plate has profiled plates on the sides so that the wire does not stick out from under the head, after tightening I press these plates to the edge of the screw.
    And the self-tightening wires with the appropriate length of the wires according to the manufacturer's requirements, it is not a problem for it to slide out by itself.
  • Helpful post
    #8 14234382
    elpapiotr
    Electrician specialist
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    And not better right?

    Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining
  • Helpful post
    #9 14234603
    Łukasz-O
    Admin of electroenergetics
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    Or yes:
    Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining
  • #10 14234643
    shulc
    Level 22  
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    I use x2, x3, x4 boxes, I use 2.5mm? Ly with pressed sleeves between the sockets.
    Of course, in 3 colors
  • #11 14234653
    elpapiotr
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    shulc wrote:
    I use x2, x3, x4 boxes, I use 2.5mm? Ly with pressed sleeves between the sockets.
    Of course, in 3 colors

    I see. And you connect the cord with the wire :D
  • #12 14234671
    shulc
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    elpapiotr wrote:
    I see. And you connect the cord with the wire

    Yes, under the screw terminal of the socket, and I'm not talking about poor quality sockets
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  • #13 14234778
    gogi20
    Level 24  
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    Bronek22 wrote:
    Socket with weight and 6 2.5mm2 wires ???
    6 wires, I do not know if it will be connected (depending on how many wires they will have), but 6 wires are no problem, you can make supplies yet. There is an example in post # 9 anyway.
    zdzisiek1979 wrote:
    I always use socket clamps and after mounting the frame, I tighten the screws before installing the sign and there is a guitar guitar.
    This is a very valuable comment. I also always tighten the contacts after mounting the socket to the box. If someone tries to do this, he will notice that sometimes when he twists in the air to the maximum, after installing the socket in the box, it goes a little more tightening.
  • #14 14234795
    Łukasz-O
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    I don't understand why :?:
    Even with shallow 2x, 3x etc. boxes, everything fits easily (with well-thought-out wiring). There is also no problem with stuffing stiff and flexible six 2.5 when mounting the socket.
    Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining

    I wonder what colleagues who like to connect directly to the accessories will do, if three 3x2.5mm? wires are connected to the box - this is often the case for technological reasons.

    Most often, problems with circuit continuity occur precisely at the socket terminals.
  • #15 14234801
    elpapiotr
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    gogi20 wrote:
    This is a very valuable comment. I also always tighten the contacts after mounting the socket to the box. If someone tries to do this, they will notice that sometimes they like twists in the air to the max after installing the socket in the box, it goes a little more tightening.

    Or twist. Nothing but losses. :cry:
  • #16 14234826
    gogi20
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    elpapiotr wrote:
    gogi20 wrote:
    This is a very valuable comment. I also always tighten the contacts after mounting the socket to the box. If someone tries to do that, they will notice that sometimes they like twists in the air to the max after mounting the socket in the box, it goes a little more tightening.

    Or twist. Nothing but losses. :cry:

    I always take a not too long extension when I tighten the contacts in sockets and connectors, so I don't think I will twist :)
  • #17 14235109
    zdzisiek1979
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    If it turns sensitively it won't twist, but "fate rule 324" anything can happen.
    If there is a larger set, well WAGO is at hand, without WAGO as without a hand, only torments.
  • #18 14235217
    Łukasz-O
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    zdzisiek1979 , you can also use the method suggested by a colleague elpapiotr - it is definitely cheaper, but more time-consuming.

    My blood is flooding when I remove the socket cover and I can see the connections on the clamps of the accessories. A typical developer who will take revenge sooner or later - believe me.
  • #19 14235276
    zdzisiek1979
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    Yes, the solution of my colleague elpapiotr is cool and practical because there is no need to pretend there are the fewest connections along the way. Well, everybody does as they can, and even if they punish them sometimes (plus supply of material).
    And so then the measurement verifies it.
    And most of the failures that I have encountered on the sockets are not a matter of connection or on the terminals, an ankle or a weight, but just a forcefully torn out socket.

    The only drawback that bothers me is when embedding the socket is the resistance of 3 veins less than 6, but a matter of habit. I'm already used to it. When a well seated can is a well inserted cable, it is a nice job, otherwise a nightmare and improvisation.

    And I'm pissed off by the cool inside of the can with plaster :D
  • #20 14235303
    TWK
    Electrician specialist
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    shulc wrote:
    Yes, under the screw terminal of the socket, and I'm not talking about poor quality sockets
    I tried this technique - it holds up poorly on the clamps. There is a difference in the cross section of the clamped ferrule with 2.5 mm? wire and the 2.5 mm? wire.
  • #21 14235395
    shulc
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    Łukasz-O wrote:
    believe it

    it convinces me, you have more practice like me
    Łukasz-O wrote:
    I can see the joints on the rigging clamps

    Yes, especially if a set of 4 is connected to each other DY,
    as for the cans
    shulc wrote:
    I use x2, x3, x4 boxes, I use 2.5mm? Ly with pressed sleeves between the sockets.

    I meant the PK-60 combo set,
    As for Wago, I have never been allergic to it, I always have it on hand and use it, but always only Wago from WAGO, which in the new version made it slimmer, but I hope it has not lost anything of its endurance.
    And you remember the discussions about these connectors, how g ..... or cool, I haven't noticed them lately, you can see more people have found out.
    So how is the connection between the sockets with the LY wire from your practice ???
  • #22 14235576
    elpapiotr
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    shulc wrote:
    So how is the connection between the sockets with the LY wire from your practice ???

    I have no idea.
  • #23 14236738
    zdzisiek1979
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    shulc wrote:

    So how is the connection between the sockets with the LY wire from your practice ???



    The problem is only with the clamp. The clamp works best when both sides of the screw have the same cross-section. There are, in a way, clamps that somehow have the same pressure regulation or something like that, but I don't go into it.
    As for the wire itself. I encountered double plaster sockets where the manufacturer specially made bridges from the line, but he tightened the forks and I have never had a problem with them.
  • #24 14236861
    TWK
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    elpapiotr wrote:
    I have no idea.
    In my tests, it did not provide a solid connection due to the difference in cross-section. Therefore, I abandoned this solution.
  • #25 14237010
    elpapiotr
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    TWK wrote:
    elpapiotr wrote:
    I have no idea.
    In my tests, it did not provide a solid connection due to the difference in cross-section. Therefore, I abandoned this solution.

    Of course not. That is why some people have never used anything like this.
  • #26 14237351
    Anonymous
    Anonymous  
  • #27 14237864
    shulc
    Level 22  
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    TWK wrote:
    In my tests, it did not provide a solid connection due to the difference in cross-section. Therefore, I abandoned this solution.

    It is a bit time-consuming, at least in my case, for one connection you need three bridges that need to be cut to about 15 cm, made and pressed on both sides. I always clamp the sleeve three or four times, then the difference between DY is not that significant
    I have two presses, a Cimco with replaceable stones
    http://cimco.home.pl/cimco/images/stories/produkty/cimco-13.pdf
    but she works poorly for these purposes, while the other company YATO, max 4 mm, I am telling you how she works in this task
    elpapiotr wrote:
    Of course not. That is why some people have never used anything like this.

    Your method, I have never used it, but the day will come that I will do it, but it must also be done correctly, in the photo in # 8 (cubes, strip) PE conductors are on top of each other, on N they are next to each other, here you can also cut (cut or crush) the vein with a screw if it is tightened incorrectly, then we press such a connector into the box and we have no control over the clamp, and it is known that the most susceptible point to bending and stretching is the weakened point
    zdzisiek1979 wrote:
    . There are, in a way, clamps that have somehow the same pressure regulation

    Let's say good accessories, some of them also have such clearance to the screw clamp that you need to press the tip properly so that it passes through it
    zdzisiek1979 wrote:
    And I'm pissed off by the cool inside of the can with plaster

    Especially the first assembly, the walls on the Coooloor and there is muck, and so you move with the litter box and the cloth for the handles
    zdzisiek1979 wrote:
    If it turns sensitively, it will not turn,

    This is true of all twist connections, and in some cases, over-zealousness is worst
    Łukasz-O wrote:
    Even with shallow 2x, 3x etc. boxes, everything fits easily (with well-thought-out wiring).

    Yes, well, almost like this is done in the kitchen, almost means not so under the corner, you know the shoemaker in the ......., but here is a uniform can, other possibilities
    Bronek22 wrote:
    Installation technology is the secrets of every professional.

    In part, yes, but if you are clever and move around the area, something will always catch your eye.
    Secondly, there is the Otwock and Falenice schools.
    When I have time, I sit and think, if I don't have time, I just sit
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  • #28 14238552
    Łukasz-O
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    shulc wrote:

    It is a bit time-consuming, at least in my case, for one connection you need three bridges that need to be cut to about 15 cm, made and pressed on both sides. I always clamp the sleeve three or four times, then the difference between DY is not that significant

    Time-consuming, additional ballast for assembly in the form of a press. Now one more thing, see how many unnecessary connections there are to transfer the entire load for the last socket in the circuit. Have someone connect a farelka in the last socket, it guarantees that all socket terminals on the line will be at least warm. With your method, you have at least two, if not three or four times as many critical places that affect the continuity of power and protection.

    shulc wrote:
    elpapiotr wrote:
    Of course not. That is why some people have never used anything like this.

    Your method, I have never used it, but the day will come that I will do it, but it must also be done correctly, in the photo in # 8 (cubes, strip) the PE conductors are on top of each other, on N they are next to each other, here you can also cut (cut or crush) the vein with a screw if it is tightened incorrectly, then we press such a connector into the box and we have no control over the clamp, and it is known that the most susceptible point to bending and stretching is the weakened point


    And here the devil is in the details. With this type of connection, it is important to wrap the wires (as it was written before the war) at the terminals, before we start to "stuff":
    Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining
    In the picture it is at a 90 ° angle (Paint ;) ) but they are about gentle curves

    Friend elpapiotr he did not mention it (did not show it), as some technical solutions seem obvious. After all, it was just about connecting.

    No. 1 - incorrect lead, sooner or later a single wire will break.
    Nos. 2 and 3 - correct derivation, bending forces are distributed, something like a spring.

    shulc wrote:
    This is true of all twist connections, and in some cases, over-zealousness is worst

    There are producers and series, for example, a well-known company on "L" - also professional (mainly in terms of price ;) ), where the threads on the screws are notoriously twisted. As soon as I know that this model is to be assembled, please the investor or buy a few more pieces.
    I think each of us has happened to twist the thread in a crappy accessory - or a kind of professional one.
    With my friend Elpapiotr or mine, only one nest will fall, and the whole further circuit with yours ...

    shulc wrote:
    Especially the first assembly, the walls on the Coooloor and there is muck, and so you move with the litter box and the cloth for the handles

    Unfortunately, this is a problem for all of us who come to assemble the equipment.

    shulc wrote:
    Łukasz-O wrote:
    Even with shallow 2x, 3x etc. boxes, everything fits easily (with well-thought-out wiring).

    Yes, well, almost like this is done in the kitchen, almost means not so under the corner, you know the shoemaker in the ......., but here is a uniform can, other possibilities

    Don't worry, it's the same for me - when I moved into my new apartment, I did everything quickly. Now I would do completely different - exemplary :D



    shulc wrote:
    Secondly, there is the Otwock and Falenice schools.
    When I have time, I sit and think, if I don't have time, I just sit

    I have heard this saying many times and to be honest I don't know what it was about ...
    I made installations in Otwock and Falenica - I did not see any differences in approach. An interesting fact is that despite Falenica administratively belongs to Warsaw, it is served by the Otwock region.
  • #29 14238627
    pol102
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    I noticed shortcuts in the German developer. Not that I have not seen similar solutions in Poland ... but ... Pass-through sockets: arrival and departure cut so short that only the balance is fastened + 1cm of reserve, and the balance is connected to the LG 1.5mm ^ 2 socket. Easy, convenient and supposedly works.
  • #30 14238631
    shulc
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    @ Lukasz-O
    Łukasz-O wrote:
    I have heard this saying many times and to be honest I don't know what it was about.

    I also do not know for sure, it is probably older than the good practice of an electrician.
    If there are two schools, there must be two teachers, of which there may be two views, etc.
    Łukasz-O wrote:
    And here the devil is in the details.

    Exactly, I did not say it was a babol and I will not make such a connection, apparently I wrote it wrong. I don't stick to mine, but I have some concerns
    Łukasz-O wrote:
    Nos. 2 and 3 - correct derivation, bending forces are distributed, something like a spring.

    Yes, but if there is play in the joint after folding, there is no room for improvement
    , I do not insist, you have more experience, what I undertake, I try to do exactly
    greetings

Topic summary

✨ The discussion revolves around the proper connection of pass-through sockets, specifically addressing the challenge of connecting multiple 2.5 mm² wires securely without losing power or risking overheating at the terminals. Various methods are suggested, including using triple weight couplings for minimal cable loosening and employing sockets with built-in WAGO connectors for easier connections. Concerns are raised about the reliability of screwless connectors and the importance of ensuring tight connections to prevent overheating. The conversation also touches on the use of clamps and the necessity of proper wire management to maintain circuit continuity. Additionally, there are mentions of different practices in Austria regarding wire connections in sockets, emphasizing the need for adherence to electrical standards.
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FAQ

TL;DR: 16 A socket rings with 2.5 mm² copper carry up to 3.6 kW safely—“tighten twice, failures halve”[Elektroda, zdzisiek1979, post #14234778]—so feed-through outlets should use screw or WAGO joints plus 10 cm 2.5 mm² pigtails; avoid 1.5 mm² reducers.

Why it matters: Correct looping prevents hidden hot spots that can destroy wiring and devices.

Quick Facts

• IEC 60364-5-52 sets 2.5 mm² as the minimum conductor size for 16 A socket circuits[IEC 60364]. • A WAGO 221-413 holds three solid 0.14-2.5 mm² wires, 32 A rated[WAGO Datasheet]. • Recommended screw torque for Schuko sockets is 0.5–0.8 N·m[Legrand Spec]. • Deep Ø60 mm box gives ±50 mm internal depth, enough for two WAGO blocks[Hager Guide]. • 221 connectors cost ≈ €0.20 each (retail, 2024).[Mouser Price]

What’s the safer alternative to looping on the terminals?

Join incoming and outgoing wires in a WAGO 221 (or 222) connector and add a short 2.5 mm² pigtail to the socket. This removes the load from the accessory screws and cuts future failure points[Elektroda, Anonymous, post #14233389]

How many 2.5 mm² wires can a standard outlet clamp hold?

Most branded Schuko outlets accept two solid 2.5 mm² per pole. For three or more, use connectors and pigtails to stay within manufacturer limits[Legrand Spec].

Why is a 1.5 mm² pigtail on a 2.5 mm² circuit a bad idea?

Protection devices are sized for 2.5 mm² (16 A). A 1.5 mm² tail may overheat before the breaker trips, violating load-matching rules[Elektroda, Enginer86, post #17664274]

How long should the pigtail be?

Cut 8–12 cm so the socket can be pulled clear for testing without straining the connector; longer creates packing problems[Hager Guide].

Which connector types are approved for solid copper in boxes?

Spring-cage (WAGO 221/222) or lever push-in blocks rated ≥32 A. Screw “chocolate blocks” are acceptable only when vibration is low and screws are accessible for retorque[IEC 60998].

How do I minimise loose connections at screw clamps?

  1. Strip 12 mm insulation.
  2. Pre-bend conductors so no stress pulls on the clamp.
  3. Tighten to 0.6 N·m, then retighten after mounting[Elektroda, zdzisiek1979, post #14234357]

What happens if a terminal loosens under load?

Contact resistance can rise 400 %, pushing hotspot temperatures above 120 °C—enough to char PVC insulation[UL Study 2018]. The fault may appear in any upstream socket, making diagnosis hard[Elektroda, ixs, post #14233304]

Are push-in, screw-less sockets reliable?

Fast-fit sockets exist, but the internal spring is weaker than WAGO levers; accidental cable pull can release the conductor[Elektroda, Anonymous, post #14233534] Use them only where cords won’t be moved often.

Can flexible LY wire be used between multi-gang boxes?

Yes, if crimp ferrules are pressed 3–4 times to match the solid conductor cross-section; otherwise the clamp may bite unevenly[Elektroda, shulc, post #14237864]

How do I verify continuity after wiring?

Perform an insulation/continuity test at 250 V DC before energising; resistance should be <0.5 Ω for a 30 m ring[Typical test limits, IEC 60364-6].

Step-by-step: adding a feed-through socket safely

  1. Strip and group incoming/outgoing 2.5 mm² conductors in a WAGO 221.
  2. Insert 10 cm 2.5 mm² pigtails for L, N, PE.
  3. Clamp pigtails to the socket, tighten, and retest.
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