IEC 60947-7-2 : 3.0

LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 7-2: ANCILLARY EQUIPMENT - PROTECTIVE CONDUCTOR TERMINAL BLOCKS FOR COPPER CONDUCTORS

International Electrotechnical Committee

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FOREWORD
1 General
  1.1 Scope
  1.2 Normative references
2 Definitions
3 Classification
4 Characteristics
  4.1 Summary of characteristics
  4.2 Type of protective conductor terminal block
  4.3 Rated and limiting values
      4.3.2 Short-time withstand current
      4.3.3 Standard cross-sections
      4.3.4 Rated cross-section
      4.3.5 Rated connecting capacity
5 Product information
  5.1 Marking
  5.2 Additional information
6 Normal service, mounting and transport conditions
7 Constructional and performance requirements
  7.1 Constructional requirements
      7.1.1 Clamping units
      7.1.2 Connection of support
      7.1.3 Clearance and creepage distances
      7.1.4 Terminal block identification and marking
      7.1.5 Resistance to abnormal heat and fire
      7.1.6 Rated cross-section and rated connecting capacity
      7.1.7 Protective conductor mounting rails
  7.2 Performance requirements
      7.2.1 Temperature rise
      7.2.2 Dielectric properties
      7.2.3 Short-time withstand current
      7.2.4 Voltage drop
      7.2.5 Electrical performance after ageing (for
            screwless-type protective conductor
            terminal blocks only)
  7.3 Electromagnetic compatibility (EMC)
8 Tests
  8.1 Kinds of test
  8.2 General
  8.3 Verification of mechanical characteristics
  8.4 Verification of electrical characteristics
      8.4.1 General
      8.4.3 Dielectric tests
      8.4.4 Verification of the voltage drop
      8.4.5 Temperature-rise test
      8.4.6 Short-time withstand current test
      8.4.7 Ageing test (for screwless-type terminal blocks
            only)
  8.5 Verification of thermal characteristics
  8.6 Verification of EMC characteristics
Annex A (normative) Maximum short-time withstand currents
        allocated to the rail profile and thermal rated
        current of a PEN busbar

Abstract

Describes requirements for protective conductor terminal blocks with PE function up to 120 mm[2] (250 kcmil) and for protective conductor terminal blocks with PEN function equal to and above 10 mm[2] (AWG 8) with screw-type or screwless-type clamping units, primarily intended for industrial applications.