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IEC 60287-2-1:2015 RLV

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance
Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Superseded date

22-05-2023

Language(s)

English

Published date

09-04-2015

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Symbols
4 Calculation of thermal resistances
5 Digital calculation of quantities given graphically
Bibliography

IEC 60287-2-1:2015 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.
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.

Committee
TC 20
DevelopmentNote
Supersedes IEC 60287. (03/2001) Stability date: 2019. (04/2015)
DocumentType
Redline
Pages
126
PublisherName
International Electrotechnical Committee
Status
Superseded
SupersededBy
Supersedes

BS 7923:2004 Electric cables. Internal gas-pressure cables and accessories for alternating voltages up to and including 275 kV (<i>U</i><sub>m</sub> = 300 kV). Requirements and test methods
13/30288278 DC : 0 BS IEC 60287-2-3 - ELECTRIC CABLES - CALCULATION OF THE CURRENT RATING - PART 2-3: CABLES INSTALLED IN VENTILATED TUNNELS
BS 7769-3-2(2012) : 2012 ELECTRIC CABLES - CALCULATION OF THE CURRENT RATING - PART 3-2: SECTIONS ON OPERATING CONDITIONS - ECONOMIC OPTIMIZATION OF POWER CABLE SIZE
IEEE 525-2007 IEEE Guide for the Design and Installation of Cable Systems in Substations
IEC 60853-3:2002 Calculation of the cyclic and emergency current rating of cables - Part 3: Cyclic rating factor for cables of all voltages, with partial drying of the soil
HD 60364-5-52:2011/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-52: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - WIRING SYSTEMS
BS IEC 60287-2-3:2017 Electric cables. Calculation of the current rating Thermal resistance. Cables installed in ventilated tunnels
CEI 20-21/3-2 : 2007 ELECTRIC CABLES - CALCULATION OF THE CURRENT RATING - PART 3-2: SECTIONS ON OPERATING CONDITIONS - ECONOMIC OPTIMIZATION OF POWER CABLE SIZE
BS IEC 60287-1-3:2002 Electric cables. Calculation of the current rating Current rating equations (100 % load factor) and calculation of losses - Current sharing between parallel single-core cables and calculation of circulating current losses
IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems
NFC 32 902 : 1998 INSULATED CABLES AND CORDS FOR INSTALLATIONS - POWER CABLE ACCESSORIES INTENDED FOR INDUSTRY, FOR RATED VOLTAGE 0,6/1(1,2) KV - TEST METHODS AND TEST REQUIREMENTS
IEC 60287-1-3:2002 Electric cables - Calculation of the current rating - Part 1-3: Current rating equations (100 % load factor) and calculation of losses - Current sharing between parallel single-core cables and calculation of circulating current losses
IEC 60287-2-3:2017 Electric cables - Calculation of the current rating - Part 2-3: Thermal resistance - Cables installed in ventilated tunnels
IEC 60287-2-2:1995 Electric cables - Calculation of the current rating - Part 2: Thermal resistance - Section 2: A method for calculating reduction factors for groups of cables in free air, protected from solar radiation
IEEE 45.8-2016 IEEE Recommended Practice for Electrical Installations on Shipboard--Cable Systems
BS 7922:2004 Electric cables. Fluid-filled, paper- and PPL-insulated, metal-sheathed cables and accessories for alternating voltages up to and including 400 kV (<i>U</i><sub>m</sub> = 420 kV). Requirements and test methods
BS IEC 60853-3:2002 Calculation of the cyclic and emergency current rating of cables Cyclic rating factor for cables of all voltages, with partial drying of the soil
IEEE 848-2015 IEEE Standard Procedure for the Determination of the Ampacity Derating Factor for Fire-Protected Cable Systems
BS 7454(1991) : 1991 METHOD FOR CALCULATION OF THERMALLY PERMISSIBLE SHORT-CIRCUIT CURRENTS, TAKING INTO ACCOUNT NON-ADIABATIC HEATING EFFECTS
S.R. HD 60364-5-52:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-52: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - WIRING SYSTEMS
IEC 60287-3-2:2012 Electric cables - Calculation of the current rating - Part 3-2: Sections on operating conditions - Economic optimization of power cable size
IEC 60364-5-523:1999 Electrical installations of buildings - Part 5: Selection and erection of electrical equipment - Section 523: Current-carrying capacities in wiring systems
BS IEC 60287-3-2:2012 Electric cables. Calculation of the current rating Sections on operating conditions. Economic optimization of power cable size
05/30131315 DC : DRAFT JUN 2005 IEC 60287-3-3 - ELECTRIC CABLES - CALCULATION OF THE CURRENT RATING - PART 3-3: SECTIONS ON OPERATING CONDITIONS - CABLES CROSSING EXTERNAL HEAT SOURCES

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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