BS 5992-2(1980) : AMD 9688

National foreword
Cooperating organizations
1 General
1.1 Scope
1.2 Object
2 Terms and definitions
2.1 Fundamental terms
2.2 Terms relating to energization (input and
       auxiliary)
2.3 Terms relating to conditions and operation of a
       relay
2.4 Terms relating to influencing quantities or
       factors
2.5 Terms relating to contact circuits
2.6 Terms relating to times
2.7 Terms relating to accuracy, applicable to a given
       specified-time relay
3 Recommended values
3.1 Energizing quantities
3.2 Contact circuits
3.3 Specified times
3.4 Influencing quantities and factors
3.5 Recommended values of intermittent periodic duty
       parameters
3.6 Recommended values of the dielectric test
       voltages
3.7 Recommended values for surge voltage tests
4 Permissible maximum temperatures
4.1 Permissible maximum temperatures of relay parts
4.2 Conditions for assessing maximum temperatures
5 Accuracy of the specified times
5.1 General
5.2 Methods of determining the errors relating to the
       specified time
5.3 Method of determining the variations relating to
       the specified time
6 Mechanical durability
7 Contact performance
8 Rated burden (power)
9 Clearances and creepage distances
10 Test methods
10.1 General test conditions (under consideration)
10.2 Energizing quantities
10.3 Dielectric tests
10.4 Surge voltage tests
10.5 Temperature rise of energizing circuits
10.6 Accuracy
10.7 Mechanical durability
10.8 Contact performance
10.9 Rated burden (power)
10.10 Insulation resistance
10.11 Environmental conditions (under consideration)
11 Data and marking
11.1 General
11.2 Requirements for marking
Appendices
A Explanatory notes
B Notes concerning the accuracy of relays
C Requirements relating to the insulation of
       electrical relays and appropriate insulating
       tests

Includes terms,definitions and suggested values of unspecified parameters.Does not cover telegraphy,telephony,signalling and blocking railway systems. See also BS 142:Sec 2.1. AMD 9688 RENUMBERS THIS STANDARD