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Current carrying capacity of aluminum cables (old domestic installation)

Malinb0ratt 31761 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 13968903
    Malinb0ratt
    Level 2  
    Unfortunately, I was not able to find (and I do not believe that it is not there) (I probably searched the application incorrectly ...) namely: long-term load capacity of aluminum conductors
    as if someone had some tables etc where would be the cross-section / max long-lasting current, FOR ALUMINUM

    (I could find only for copper, and for aluminum in high voltage and huge (energetic) cross-sections, and I am interested in old buildings and what the standards say (yes, I know now aluminum is "somewhat forbidden" in domestic installations))

    generally I want to know if I can connect a 4KW heater, the "plugs" are for 20A, but for this installation everything is possible

    PS
    wires "probably" 1.5mm2 (but I'll find out more precisely)
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  • #2 13968925
    Ture11
    Level 39  
    Hello.
    I am not an electrician, but I learn a little about it. As for connecting a 4kW heater to a 1.5mm2 cable, I would not do it even with a copper cable, and what about aluminum ...
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  • #3 13968934
    Malinb0ratt
    Level 2  
    Hehe,
    My guess is.
    1.5 in copper for lighting and trinkets, and in aluminum it is probably a flashlight or Christmas tree lamps according to the standards.

    But I will not let my head know how much of this cross-section is there (I have to find out).
    Nevertheless, I am an electrician, it is possible that I will be (or I will deal with such issues) and I am also simply interested in the "strength" of aluminum in specific popular sections, which are no longer present today
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  • #5 13969033
    witold04
    Level 18  
    Malinb0ratt wrote:
    (I know that now aluminum is "kind of banned

    It is not forbidden :) All connections are still made of Aluminum.

    Moderated By kkas12:

    3.1.11. It is forbidden to publish entries that do not contain substantive content, contain harmful advice, advice that is not an attempt to solve the problem, and the publication of identical entries consecutive or repeating information from the discussion.

    Please do not mislead and do not mix building installations with networks owned by the Power Plant.
    Today, aluminum conductors with a cross-section of less than 10mm2 cannot be used.

  • #6 13969055
    Miniax
    Electrician specialist  
    It is enough to compare the conductivity of copper and aluminum and take the appropriate multiplier. In general, it is enough to know the load capacity of the copper wire for the given conditions and divide the value by 1.6.
    The most important, however, is the condition of such an aluminum installation, especially the connections that need to be regularly checked due to aluminum oxidation.
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  • #7 13969332
    TWK
    Electrician specialist  
    Such old cables are described in the PBUE. PBUE assumed greater long-term load capacity than the current standards, as Dr. Musiał once wrote in one of his articles. For example, according to PBUE 1980 for a two-core aluminum cable laid in plaster (without any coefficients), eg ADYt or ADYp, cross-section 1.5 mm? - long-term load capacity 19A.

    Connecting a 4kW single-phase heater is not possible on such a cable:
    1. It is probably an old, worn-out installation.
    2. There is no way to protect it - 16 A (according to the old standards) is too little due to the receiver's current, and 20 A is too much.

    In addition, I believe that this 20 A protection should be replaced with a smaller one, in accordance with the applicable standards.
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Topic summary

The discussion centers on the long-term load capacity of aluminum conductors, particularly in older domestic installations. A user inquires about the feasibility of connecting a 4kW heater to a 1.5mm² aluminum cable, expressing difficulty in finding relevant data. Responses indicate that while aluminum is still used in connections, its load capacity is lower than that of copper. It is suggested that the long-term load capacity for a 1.5mm² aluminum cable is approximately 19A according to older standards (PBUE 1980). Concerns are raised about the condition of old installations and the need for appropriate circuit protection, as a 20A breaker may be excessive for such wiring. Overall, connecting a 4kW heater to this setup is deemed unsafe.
Summary generated by the language model.
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