BS IEC 60943:1998
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals
Hardcopy , PDF
30-06-2009
English
17-03-1999
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FOREWORD
INTRODUCTION
SECTION 1: GENERAL
1 General
1.1 Scope and object
1.2 Reference documents
1.3 Definitions
1.4 Symbols
SECTION 2: THEORY
2 General considerations concerning the nature of electric contact
and the calculation and measurement of the ohmic resistance of
contacts
2.1 Electric contacts and connection terminals
2.2 Nature of electrical contact
2.3 Calculation of contact resistance
3 Ageing mechanisms of contacts and connection terminals
3.1 General
3.2 Contacts of dissimilar metals
3.3 Oxidation ageing mechanisms
3.4 Results concerning ageing of copper contacts
3.5 Usage and precautions to be taken in the use of copper contact
materials
4 Calculation of temperature rise of conductors, contacts and
connection terminals.
4.1 Symbolic representation
4.2 Temperature rise Ts of a conductor with respect to the
temperature Te of the surrounding medium
4.3 Temperature rise To in the vicinity of the contact: temperature
rise of connection terminals
4.4 Temperature rise of the elementary contact points
Section 3: Application
5 Permissible temperature and temperature rise values
5.1 Ambient air temperature
5.2 Temperature and temperature rise of various equipment components
5.3 Temperature and temperature rise of conductors connecting
electrical equipment
5.4 Temperature and temperature rise of connection terminals for
electrical equipment - Influence on connected conductors
6 General procedure to be followed for determining permissible
temperature and temperature rise
6.1 Basic parameters
6.2 Method to be followed for determining maximum permissible
temperature and temperature rise
Annexes
A Numerical examples of the application of the theory and other data
B Physical characteristics of selected metals and alloys
C Physical characteristics of fluid dielectrics
D Information on the reaction of contact metals with substances in the
atmosphere
E Temperature rise of a conductor cooled by radiation and convection in
the vicinity of a terminal
F List of symbols used in this report
G Bibliography
Relates to the thermal effects of currents passing through connections, contacts and terminals giving examples of application of the theory and of thermal modelling.
| Committee |
PEL/32
|
| DevelopmentNote |
SUPERSEDES BS PD 6524:1989, WHICH IS WITHDRAWN
|
| DocumentType |
Standard
|
| Pages |
54
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| Standards | Relationship |
| IEC TR 60943:1998+AMD1:2008 CSV | Identical |
| IEC 60050-441:1984 | International Electrotechnical Vocabulary (IEV) - Part 441: Switchgear, controlgear and fuses |
| IEC 60694:1996+AMD1:2000+AMD2:2001 CSV | Common specifications for high-voltage switchgear and controlgear standards |
| IEC 60085:2007 | Electrical insulation - Thermal evaluation and designation |
| IEC 60721-2-1:2013 | Classification of environmental conditions - Part 2-1: Environmental conditions appearing in nature - Temperature and humidity |
| IEC 60947-1:2007+AMD1:2010+AMD2:2014 CSV | Low-voltage switchgear and controlgear - Part 1: General rules |
| IEC 60364-4-42:2010+AMD1:2014 CSV | Low-voltage electrical installations - Part 4-42: Protection forsafety - Protection against thermal effects |
| IEC 60216-1:2013 | Electrical insulating materials - Thermal endurance properties - Part 1: Ageing procedures and evaluation of test results |
| IEC TR 60890:2014 | A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation |
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