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

ixs 71970 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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  • #31 14238637
    Łukasz-O
    Admin of electroenergetics  
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    shulc wrote:

    I don't know for sure either, it is probably older than good electrician practice.
    If there are two schools, there must be two teachers, of which there may be two views, etc.

    Well, each of us has heard but we don't know what's going on ;)


    shulc wrote:
    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

    Backlash can always occur on a single clamp - here we have a double screw clamp. Of course, anything is possible ...
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  • #32 14238649
    shulc
    Level 22  
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    Łukasz-O wrote:
    here we have a double screw clamp

    accessories can be re-tightened at the clamps.
    After all, you remember the connectors in PO boxes from AL from the last century, let's skip the load that grew with the age of the installation, and if it was solidly made, it has survived.
    Obviously, you have to look at the conditions of exploration differently, both new and from that era
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  • #33 14238662
    Łukasz-O
    Admin of electroenergetics  
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    PO with AL? Never mind...
    And do you remember the "whirlwind" that keeps hiccups in installations to this day in the great album? There they were also connected as a colleague now proposes - identically :D
    Maybe it's time to draw conclusions?
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  • #34 14238683
    shulc
    Level 22  
    Posts: 635
    Help: 37
    Rate: 109
    Łukasz-O wrote:
    And do you remember the "whirlwind" that keeps hiccups in installations to this day in the great album? There they were also connected as a colleague now proposes - identically
    Maybe it's time to draw conclusions?

    a vibrator, I do not know what it is, I do not know what it is, I do not associate it with anything. I would like some tips, maybe I know it under a different name.
    I draw conclusions and I do not question your and other colleagues' ways of connecting, I even point out that you have more practice.
    I always try to spit on the cold, now I wonder about the connections I made earlier. We can all make mistakes, but the truth is, the older you get, the more you wonder if you are doing right and right
  • #35 14238687
    Łukasz-O
    Admin of electroenergetics  
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    Drill without housing - button light:
    Pass-through Sockets Wiring: Safely Connecting 3x2.5mm² Wires for Daisy-Chaining

    PS
    It is a hardware in a large plate :D
  • #36 17662391
    mafialosoo
    Level 9  
    Posts: 92
    Rate: 19
    In Austria, the practice is a bit different than in Pl. There is nothing bonded in cans in sockets. The veins are inserted into the input and output terminals. It holds quite firmly in Gira or Siemens accessories, we install such accessories at our customers' premises. Once, I talked to an electrician what works in Pl and asked him how he arranges the wires as he has, for example, a single round box and he must maintain the continuity of the circuit in it, plus connect the socket to it. A total of 6 2.5mm wires. He replied that he connects the power circuit to the Wago and he connects the socket to the circuit with 1.5mm wires. Is such a practice followed?

    Greetings!
  • #37 17664274
    Enginer86
    Level 9  
    Posts: 9
    Rate: 3
    mafialosoo wrote:
    In Austria, the practice is a bit different than in Pl. There is nothing bonded in cans in sockets. The veins are inserted into the input and output terminals. It holds quite firmly in Gira or Siemens accessories, we install such accessories at our customers' premises. Once, I talked to an electrician what works in Pl and asked him how he arranges the wires as he has, for example, a single round box and he must maintain the continuity of the circuit in it, plus connect the socket to it. A total of 6 2.5mm wires. He replied that he connects the power circuit to the Wago and he connects the socket to the circuit with 1.5mm wires. Is such a practice followed?

    Greetings!


    It is used, except that it is a socket outlet also 2.5mm!
    After all, the protection in TB is adjusted to 2.5mm
  • #38 17664380
    mafialosoo
    Level 9  
    Posts: 92
    Rate: 19
    Oh, what's a fluff?
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  • #39 17664441
    Enginer86
    Level 9  
    Posts: 9
    Rate: 3
    mafialosoo wrote:
    Oh, what's a fluff?


    Why is that?
  • #40 17664458
    mafialosoo
    Level 9  
    Posts: 92
    Rate: 19
    Since you wrote that the departure from the socket to the circuit should also be 2.5mm, not 1.5mm, as my electrician friend told me.
  • #41 17664496
    Enginer86
    Level 9  
    Posts: 9
    Rate: 3
    Exactly, your friend's solution is against the art.
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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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