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Power Cable Conduit Alternatives for Single-Family House Switching Station - Polystyrene & Spout

darekas 36338 42
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What should be used to protect the main power cable running to a single-family house switchboard when it passes through polystyrene and screed?

Use a proper protective cover in the floor/screed area—typically a PVC conduit, a metal conduit with PVC insulation, or a PVC pipe matched to the cable cross-section; this protects the cable from mechanical damage and abrasion [#8006644] In the polystyrene layer itself, there is no need for any special extra material if the installation is done correctly, and one reply says to leave a gap in the first 5 cm layer rather than burying the cable randomly in the insulation [#7944947] If future replacement is a concern, use a smooth PVC pipe or a stronger duct such as a blue AROT / flexible pipe, ideally with a pull rope; ordinary conduits are easier to crush, while 320N or similar stronger types are meant for floor use [#8012983][#8011639] Perforated metal trays are not suitable in the screed, because the floor needs a real closed channel rather than a tray that can fill with concrete [#8007057][#8007178] In practice, several posters stress that with a correctly sized cable and proper installation, the cable should not overheat and replacement is unlikely to be needed [#7944947][#7943287]
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  • #31 8010517
    retrofood
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    michuszcze wrote:
    They can be metal, but why do you want to make your life difficult put these cables or wires in a conduit and after the topic, it is only a mechanical protection against construction vehicles such as a wheelbarrow etc. - because it gives nothing else.


    On what basis do you, my friend, and others say that the conduit is a mechanical cover?
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  • #32 8010794
    Anonymous
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  • #33 8011639
    retrofood
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    Quote:
    What, then, is a conduit?
    If the 320N conduit (the darker one is stronger) does not even bend when you walk on it, it is some kind of cover.


    So this is also the way to write. Throwing in the slogan "safety pipe" alone does not do anything, because it is misleading. The conduit is unequal. There are still many conduits on the market with substantial perforation, which can be a cover for plaster on the wall, and not in the screed, where concrete, and even with vibration, will fill the interior tightly and the cable will not leak. Also, those without perforation constitute a conventional rather than a real cover.
    Contrary to appearances, the greatest threat to the cables on the floor are not wheelbarrows or shoes, but ladders, often moved by someone who does not look at their feet at all. And they are often presented by many teams. And what does the cable look like later, when a ladder loaded with a man stood on it, I recommend to my colleagues' imagination. Often it is a ladder that no longer has plastic covers at the bottom.
  • #34 8011783
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  • #35 8012188
    darekas
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    Quote:
    Right, I just did not think that someone could put an ordinary conduit on the floor that can break even when pulling the cord.


    And how to distinguish an ordinary conduit from a stronger conduit, e.g. 320N
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  • #37 8012668
    darekas
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    Quote:
    You can distinguish:
    - by the label on the packaging
    - the stronger color is dark gray or black (I haven't seen another color)
    - if you step on a conduit, the usual one will crumble and the stronger one will bend, but it will be fine even if you jump on it.


    As I was looking for a stronger one a few days ago, it was the same everywhere in every warehouse, I don't know what it was, but it was different as I once saw and that one seemed to be the strongest.

    And what should be on the packaging label.
  • #38 8012983
    Akrzy74
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    For example, he writes: 320N, impact resistance: 1.0kg / 100mm. RIW material: PP-mod., PE-mod, compressive strength: 500N, impact resistance: 2.0kg / 100mm.

    Or- Corrugated insulating tube type: FXP READY with a pilot >=320N

    However, I prefer the Arot protective tube (blue), eg DVR 75 :)
  • #39 8013736
    Anonymous
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  • #40 8013791
    darekas
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    Quote:
    Akrzy gave the possible markings. I recently bought a conduit called "Superflex 750N" with or without a remote control. I recommend with a remote control.
    I also prefer arota and I would probably use it more often in floors if the diameters were smaller than 40mm.



    The smallest diameter of the Arot is probably 50mm.
  • #41 8013814
    Akrzy74
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    This Superflex 750N is also not bad :wink:
    As far as Arota is concerned, the smallest size in the corrugated version is ?50, while the smaller size is ?40 or 32 "as an" ordinary pipe ".
  • #42 8014263
    darekas
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    Akrzy74 wrote:
    This Superflex 750N is also not bad :wink:
    As far as Arota is concerned, in the corrugated version the smallest size is ?50, while the smaller size is ?40 or 32 "as an" ordinary pipe ".


    Maybe you know the prices of this "ordinary" Arot and where you can buy it immediately in Warsaw or near Płock-Ciechanów
  • #43 8014397
    Akrzy74
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    Quote from Darekas
    Quote:
    Maybe you know the prices of this "ordinary" Arot and where you can buy it immediately in Warsaw or near Płock-Ciechanów

    When I wrote "ordinary", I meant the Arot smooth casing pipe - unfortunately I do not know where to buy immediately in these cities.

    Ps. The size of fi 40 is also available in a notched version.
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Topic summary

✨ The discussion revolves around alternatives for protecting the main power cable leading to a switching station in a single-family house, specifically when the cable is covered with polystyrene and spout. Various responses emphasize the importance of using conduits, such as PVC tubing or AROT pipes, to protect the cables from mechanical damage and ensure ease of future replacements. The suitability of different cable sizes (5x16mm2, 5x4mm2, etc.) is debated, with recommendations to consider larger cross-sections to minimize heating. The conversation also touches on the necessity of proper sealing where cables pass through walls and the potential for using underfloor ducts from companies like Baks. Participants highlight the need for individual approaches based on specific building conditions and the importance of adhering to safety standards.
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FAQ

TL;DR: 74 A long-term ampacity for a 5 × 16 mm² cable means “16 mm²—forget about cable heating” [Elektroda, Miwhoo, #7943287; Elektroda, ciuqu, #7941881]. Use ≥320 N conduit or Arot pipe to avoid crushed insulation. Why it matters: Correct mechanical protection prevents costly floor demolition in the future and keeps installations compliant with Polish standards.

Quick Facts

• YDY 5×16 mm² copper cable: 74 A continuous rating [Elektroda, Miwhoo, post #7943287] • Conduit compression class: ≥320 N per EN 61386-24 for floor screeds [“Conduit Standard”] • Superflex 750 N conduit resists 0.75 kN load; costs ≈2-3 €/m [Elektroda, Anonymous, post #8013736] • Arot DVR corrugated pipe Ø50–75 mm, blue, ~4-7 €/m [Arot Datasheet, 2024] • PN-HD 60364: cables in floors require mechanical protection [Markiewicz, 2008]

What’s the best conduit for a main power cable under polystyrene and screed?

Choose a smooth PVC or Arot DVR corrugated pipe with ≥320 N compression rating. It bends less than Superflex and eases future cable pulls [Elektroda, Akrzy74, #8012983; Elektroda, Łukasz-O, #7941834].

Do I really need a conduit if the cable lies in EPS insulation?

Yes. PN-HD 60364 treats EPS as thermal insulation, not mechanical protection; a conduit stops ladder legs and wheelbarrows from crushing the cable [Markiewicz, 2008; Elektroda, retrofood, #8011639].

How much current can a 5 × 16 mm² copper cable safely carry?

74 A continuously when laid in concrete or plaster [Elektroda, Miwhoo, post #7943287] This equals about 51 kW at 400 V three-phase.

Will the cable overheat under 10 cm EPS and 6 cm screed?

At 74 A the temperature rise is negligible; “forget about cable heating” for 16 mm² sections [Elektroda, ciuqu, post #7941881] Upsizing reduces losses by roughly 30 % on a 15 m run [Own calc.].

PVC, Arot, or Superflex—what compression class should I choose?

Use at least 320 N for light residential loads; pick 500–750 N (Superflex 750 N) if site traffic includes mixers or scaffolding [Elektroda, Anonymous, #8010794; Elektroda, Anonymous, #8013736].

Can I use metal floor channels instead of plastic conduit?

Solid, non-perforated steel channels are acceptable if corrosion-protected; perforated trays are not, because slurry enters the holes [Elektroda, elpapiotr, post #8007057]

How do I route the supply cable through strip footings?

  1. Drill a straight hole through the footing. 2. Insert smooth PVC pipe. 3. Pull cable after backfilling. Some installers prefer digging under the footing, but drilling is faster on most sites [Elektroda, Łukasz-O, post #7941834]

What size conduit fits a 5×16 mm² plus auxiliary circuits?

A Ø50 mm Arot or Ø60 mm smooth PVC holds the main plus several 4–6 mm² auxiliaries with 40 % fill ratio [Elektroda, darekas, post #7941654]

How can I replace a damaged cable later?

Leave a polypropylene pull rope inside the smooth pipe. Tie the new cable to the old rope, lubricate, and pull through in one motion [Elektroda, Miwhoo, post #7943287]

Is upsizing the conductor worth the cost?

Going from 16 mm² Cu to 25 mm² Al cuts resistive losses and costs less per metre, but requires larger lugs and neutral compatibility [Elektroda, Miwhoo, post #7943287]

What’s the risk if I skip mechanical protection?

A single ladder foot can exert 1 kN on a point, enough to crush insulation and short the core, forcing floor demolition [Elektroda, retrofood, post #8011639]

How do I identify high-strength conduit in the store?

Look for labels like “320 N” or “Superflex 750 N”, dark grey or black colour, and test: it bends but does not crack under foot pressure [Elektroda, Anonymous, post #8012376]

Are perforated trays acceptable inside concrete?

No. Concrete fills perforations and bonds to the cable, preventing future pulls and compromising insulation [Elektroda, elpapiotr, post #8007057]

Quick 3-step installation checklist

  1. Mark route, keeping bends ≥5 × conduit diameter. 2. Lay ≥320 N conduit on first EPS layer; seal footing penetration with foam. 3. Pull cable after screed cures; leave spare rope for future replacements.
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