BS IEC 60943:1998

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.