FOREWORD
PREFACE
1 Scope
2 Normal and special service conditions
3 Definitions
   3.101 General terms
   3.102 Switching devices
   3.103 Parts of switching devices
   3.104 Operation (of a mechanical switching device)
   3.105 Characteristic quantities
4 Rating
   4.1 Rated voltage
   4.2 Rated insulation level
   4.3 Rated frequency
   4.4 Rated normal current and temperature rise
   4.5 Rated short-time withstand current
   4.6 Rated peak withstand current
   4.7 Rated duration of short circuit
   4.8 Rated supply voltage of closing and opening
         devices and auxiliary circuits
   4.9 Rated supply frequency of operating devices
         and auxiliary circuits
   4.10 Rated pressure of compressed gas supply for
         operation
   4.101 Rated short-circuit making current
   4.102 Rated contact zone
   4.103 Rated mechanical terminal load
   4.104 Rated values of maximum force required for
         manual operation (under consideration)
   4.105 Behaviour when carrying rated peak withstand
         current and rated short
   4.106 Behaviour of earthing switches when making
         short-circuit currents
   4.107 Co-ordination of rated voltages, rated normal
         currents, rated short-time withstand currents
         and rated peak withstand currents
5 Design and construction
   5.1 Requirements for liquids in disconnectors and
         earthing switches
   5.2 Requirements for gases in disconnectors and
         earthing switches
   5.3 Earthing of disconnectors and earthing switches
   5.4 Auxiliary equipment
   5.5 Dependent power closing
   5.6 Stored energy closing
   5.7 Operation of releases
   5.8 Low and high pressure interlocking devices
   5.9 Nameplates
   5.101 Special requirements for earthing switches
   5.102 Requirements in respect of the isolating distance
         of disconnectors
   5.103 Mechanical strength
   5.104 Position of the movable contact system and
         its indicating or signalling devices
6 Type tests
   6.1 Dielectric tests
   6.2 Radio interference voltage (r.i.v.) tests
   6.3 Temperature-rise tests
   6.4 Measurement of the resistance of the main circuit
   6.5 Short-time and peak withstand current tests
   6.101 Tests to prove the short-circuit making
         performance of earthing switches
   6.102 Operating and mechanical endurance tests
   6.103 Operation under severe ice conditions
   6.104 Operation at the temperature limits
7 Routine tests
   7.1 Power-frequency voltage withstand dry tests
        on the main circuit
   7.2 Voltage withstand tests on auxiliary and
        control circuits
   7.3 Measurement of the resistance of the main
         circuit
   7.101 Mechanical operating tests
8 Guide to the selection of switching devices for service
   8.101 General
   8.102 Selection of rated values for normal service
         conditions
9 Information to be given with enquiries, tenders
   and orders
   9.101 Information to be given with enquiries and orders
   9.102 Information to be given with tenders
10 Rules for transport, storage, erection and maintenance
   10.1 Conditions during transport, storage and erection
   10.2 Erection
   10.3 Maintenance
FIGURES