IEC 60470:1999

Foreword
1 General
      1.1 Scope and object
      1.2 Normative references
2 Normal service conditions
      2.1 Special service conditions
3 Definitions
      3.1 General terms
      3.2 Assemblies of switchgear and controlgear
      3.3 Parts of assemblies
      3.4 Switching devices
      3.5 Parts of switchgear and controlgear
      3.6 Operation
      3.7 Characteristic quantities
4 Ratings
      4.1 Rated voltage (Ur)
      4.2 Rated insulation level
      4.3 Rated frequency (fr)
      4.4 Rated normal current and temperature rise
      4.5 Rated short-time withstand current (lk)
      4.6 Rated peak withstand current (lp)
      4.7 Rated duration of short circuit (tk)
      4.8 Rated supply voltage of closing and opening
             devices, and of auxiliary and control
             circuits(Ua)
      4.9 Rated supply frequency of closing and opening
             devices, and of auxiliary circuits
      4.10 Rated pressure of compressed gas supply for
             insulation and/or operation
5 Design and construction
      5.1 Requirements for liquids
      5.2 Requirements for gases
      5.3 Earthing
      5.4 Auxiliary and control equipment
      5.5 Dependent power operation
      5.6 Stored energy operation
      5.7 Independent manual operation
      5.8 Operation of releases
      5.9 Low-and-high-pressure interlocking and
             monitoring devices
      5.10 Nameplates
      5.11 Interlocking devices
      5.12 Position indication
      5.13 Degrees of protection by enclosures
      5.14 Creepage distances
      5.15 Gas and vacuum tightness
      5.16 Liquid tightness
      5.17 Flammability
      5.18 Electromagnetic compatibility (EMC)
6 Type tests
      6.1 General
      6.2 Dielectric tests
      6.3 Radio interference voltage (r.i.v) test
      6.4 Measurement of the resistance of circuits
      6.5 Temperature-rise tests
      6.6 Short-time withstand current and peak
             withstand current tests
      6.7 Verification of the protection
      6.8 Tightness tests
      6.9 Electromagnetic compatibility tests (EMC)
7 Routine tests
      7.1 Dielectric test on the main circuit
      7.2 Dielectric test on auxiliary and control
             circuits
      7.3 Measurement of the resistance of the main
             circuit
      7.4 Tightness test
      7.5 Design and visual checks
8 Guide to the selection of contractors and motor-
      starters for service
9 Information to be given with enquiries, tenders and
      orders
10 Rules for transport, storage, erection, operation and
      maintenance
11 Safety
Annex A (normative) Records and reports of type tests for
                    making, breaking and short-time current
                    performance
Figure 1 - Examples of speed/time curves
Figure 2 - Test duties A and B - preferred earth point
Figure 3 - Test duties A and B - alternative earth point
Figure 4 - test duty C - preferred earth point
Figure 5 - Test duty C - alternative earth point
Figure 6 - Representation by two parameters of a prospective
           TRV of a circuit
Figure 7 - Representation by four parameters of a prospective
           TRV of a circuit
Figure 8 - Representation of the specified TRV by a two-
           parameter reference line and a delay line
Figure 9 - Determination of power frequency recovery voltage
Figure 10 - Characteristics for determining take-over current
Table 1 - Ratings and characteristics - Ratings/characteristics
Table 2 - Utilization categories
Table 3 - Characteristics dependent on starter type
Table 4 - Characteristics of the opening operation of overload
          relays when energized on all poles
Table 5 - Characteristics of the opening operation of three-
          pole thermal overload relays when energized on two
          poles only
Table 6 - Characteristics of the opening by three-pole phase
          failure-sensitive thermal overload relays when their
          poles are not equally energized
Table 7 - Applicable type tests
Table 8 - Test copper conductors for test currents up to 800A
          inclusive
Table 9 - Intermittent duty operating cycles
Table 10 - Verification of rated making and breaking capacities
           - Conditions for making and breaking corresponding
           to the several utilization categories are rated
           voltage Ur
Table 11 - Relationship between current broken lc and OFF time
Table 12 - Overload current withstand requirements
Table 13 - Transient recovery voltage characteristics
Table 14 - Verification of the number of on-load operating cycles
           - Conditions for making and breaking corresponding
           to the several utilization categories

Applicable to a.c. contactors and/or contactor-based motor-starters designed for indoor installation and operation at frequencies up to and including 60 Hz on systems having voltages above 1 000 V but not exceeding 12 000 V.Applicable only to three-pole contactors and starters for use in three-phase systems and single-pole contactors and starters for use in single-phase systems.