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  • BSI
    BS IEC 60287-2-1:2015 Electric cables. Calculation of the current rating - Thermal resistance. Calculation of thermal resistance
    Edition: 2015
    $473.45
    / user per year

Description of BS IEC 60287-2-1:2015 2015

This part of IEC 60287 is solely applicable to the conditions of steady-state operation of cables at all alternating voltages, and direct voltages up to 5 kV, buried directly in the ground, in ducts, in troughs or in steel pipes, both with and without partial drying-out of the soil, as well as cables in air. The term "steady state" is intended to mean a continuous constant current (100 % load factor) just sufficient to produce asymptotically the maximum conductor temperature, the surrounding ambient conditions being assumed constant.

This part of IEC 60287 provides formulae for thermal resistance.

The formulae given are essentially literal and designedly leave open the selection of certain important parameters. These may be divided into three groups:

  • parameters related to construction of a cable (for example, thermal resistivity of insulating material) for which representative values have been selected based on published work;

  • parameters related to the surrounding conditions which may vary widely, the selection of which depends on the country in which the cables are used or are to be used;

  • parameters which result from an agreement between manufacturer and user and which involve a margin for security of service (for example, maximum conductor temperature).

Equations given in this part of IEC 60287 for calculating the external thermal resistance of a cable buried directly in the ground or in a buried duct are for a limited number of installation conditions. Where analytical methods are not available for calculation of external thermal resistance finite element methods may be used. Guidance on the use of finite element methods for calculating cable current ratings is given in IEC TR 62095 .



Standard NumberBS IEC 60287-2-1:2015
TitleElectric cables. Calculation of the current rating - Thermal resistance. Calculation of thermal resistance
StatusWithdrawn
Publication Date2015-04-30
Withdrawn Date2023-07-10
ReplacesBS IEC 60287-2-1:1994+A2:2006
Replaced ByBS IEC 60287-2-1:2023
Identical National Standard OfIEC 60287-2-1:2015
DescriptorsCable sheaths, Electric conductors, Electric cables, Multicore cables, Rated current, Formulae (mathematics), Heat loss, Solid electrical insulating materials, Sheathed cables, Underground, Thermal resistance, Mathematical calculations, Absorptance, External
ICS29.060.20 Cables
CommitteeGEL/20/16
ISBN978 0 580 80953 8
PublisherBSI
Pages46

The following editions for this book are also available...

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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