The paper presents the problems related to the selection of parallel single-core low voltage cables in terms of their current carrying capacity and accordance with PN-IEC 60364-5-523 national standard, exemplified by electric power transmission from transformer MV/LV 1600kVA, with proximity effects also taken into consideration. Streszczenie. Przedstawiony poniżej tekst opisuje problemy związane z doborem wielowiązkowych linii kablowych niskiego napięcia pod względem obciążalności długotrwałej zgodnie z normą PN-IEC 60364-5-523 na przykładzie wyprowadzenia mocy z transformatora SN/nN 1600kVA z uwzględnieniem wpływu zjawiska zbliżenia. (Obciążalność długotrwała wielowiązkowych linii kablowych nN).
Skin and proximity effects have a considerable impact on current distribution in multistrand cable lines. Under unfavorable heat exchange conditions, some strands may be subject to excessive overheating, which may lead to serious malfunctions or even fires of the installation. The paper proposes a new criterion for a quick choice of spatial configurations, for which the effect might be minimized. A comprehensive analysis of literature cases is provided, including the recommendations of the U.S. National Code and the Canadian standard.
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