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