IEC 60287-2-1:2015
Collections
International IEC standards
Publication date
April 2015
Number of pages
84 p.
Reference
IEC 60287-2-1:2015
IEC 60287-2-1:2015
April 2015
International standard
Cancelled
Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of the thermal resistance
IEC 60287-2-1:2015 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. This second edition of IEC 60287-2-1 cancels and replaces the first edition, published in 1994, Amendment 1:2001, Amendment 2:2006 and Corrigendum 1:2008. This edition includes the following significant technical changes with respect to the previous edition:a) inclusion of a reference to the use of finite element methods where analytical methods are not available for the calculation of external thermal resistance;b) explanation about SL and SA type cables;c) calculation method for T3 for unarmoured three-core cables with extruded insulation and individual copper tape screens on each core;d) change of condition for X in 5.4;e) inclusion of constants or installation conditions for water filled ducts in Table 4.
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Sumary
Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of the thermal resistance
IEC 60287-2-1:2015 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. This second edition of IEC 60287-2-1 cancels and replaces the first edition, published in 1994, Amendment 1:2001, Amendment 2:2006 and Corrigendum 1:2008. This edition includes the following significant technical changes with respect to the previous edition:
a) inclusion of a reference to the use of finite element methods where analytical methods are not available for the calculation of external thermal resistance;
b) explanation about SL and SA type cables;
c) calculation method for T3 for unarmoured three-core cables with extruded insulation and individual copper tape screens on each core;
d) change of condition for X in 5.4;
e) inclusion of constants or installation conditions for water filled ducts in Table 4.
IEC 60287-2-1:2015 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. This second edition of IEC 60287-2-1 cancels and replaces the first edition, published in 1994, Amendment 1:2001, Amendment 2:2006 and Corrigendum 1:2008. This edition includes the following significant technical changes with respect to the previous edition:
a) inclusion of a reference to the use of finite element methods where analytical methods are not available for the calculation of external thermal resistance;
b) explanation about SL and SA type cables;
c) calculation method for T3 for unarmoured three-core cables with extruded insulation and individual copper tape screens on each core;
d) change of condition for X in 5.4;
e) inclusion of constants or installation conditions for water filled ducts in Table 4.
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Replaced standards
(4)
IEC 60287-2-1:1994/AMD2:2006/COR1:2008
January 2008
International standard
Cancelled
Corrigendum 1 - Amendment 2 - Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of the thermal resistance
IEC 60287-2-1:1994/AMD2:2006
March 2006
International standard
Cancelled
Amendment 2 - Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
The contents of the corrigendum of January 2008 have been included in this copy.
IEC 60287-2-1:1994/AMD1:2001
August 2001
International standard
Cancelled
Amendment 1 - Electric cables - Calculation of the current rating - Part 2: Thermal resistance - Section 1: Calculation of thermal resistance
IEC 60287-2-1:1994
December 1994
International standard
Cancelled
Electric cables - Calculation of the current rating - Part 2: Thermal resistance - Section 1: Calculation of thermal resistance
Is solely applicable to the conditions of steady-state operation of cables at all alternating voltages, as well as in 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.
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Standard replaced by
(1)
IEC 60287-2-1:2023
May 2023
International standard
Current
Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
IEC 60287-2-1:2023 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.
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