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BS IEC 60943:1998

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals
Available format(s)

Hardcopy , PDF

Superseded date

30-06-2009

Language(s)

English

Published date

17-03-1999

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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$568.62
Including GST where applicable

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