BS IEC 60287-2-1:2015
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Electric cables. Calculation of the current rating Thermal resistance. Calculation of thermal resistance
Hardcopy , PDF
10-07-2023
English
30-04-2015
Committee |
GEL/20/16
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DevelopmentNote |
Supersedes and renumbers BS 7769-2.1(1997). 1994 + A2 2006 Edition incorporates & renumbers BS 7769-2.1(1997). Supersedes 98/264617 DC and 05/30122011 DC. (06/2008) Supersedes 12/30273095 DC. (05/2015)
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DocumentType |
Standard
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Pages |
46
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PublisherName |
British Standards Institution
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Status |
Superseded
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SupersededBy | |
Supersedes |
This part of IEC60287 is solely applicable to the conditions of steady-state operation of cables at all alternating voltages, and direct voltages up to 5kV, 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 IEC60287 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 IEC60287 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 IECTR62095 .
Standards | Relationship |
IEC 60287-2-1:2015 RLV | Identical |
IEC 60287-2-1:2015 | Identical |
IEC TR 62095:2003 | Electric cables - Calculations for current ratings - Finite element method |
IEC 60853-2:1989 | Calculation of the cyclic and emergency current rating of cables. Part 2: Cyclic rating of cables greater than 18/30 (36) kV and emergency ratings for cables of all voltages |
IEC 60287-3-1:2017 | Electric cables - Calculation of the current rating - Part 3-1: Operating conditions - Site reference conditions |
IEC 60287-1-1:2006+AMD1:2014 CSV | Electric cables - Calculation of the current rating - Part 1-1:Current rating equations (100 % load factor) and calculation of losses - General |
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