IEC 60947-7-2:2009

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

IEC 60947-7-2:2009 specifies requirements for protective conductor terminal blocks with PE function up to 120 mm² (250 kcmil) and for protective conductor terminal blocks with PEN function equal to and above 10 mm² (AWG 8) with screw-type or screwless-type clamping units, primarily intended for industrial applications. Protective conductor terminal blocks are used to form the electrical and mechanical connection between copper conductors and the fixing support. lt is applicable to protective conductor terminal blocks for the connection of round copper conductors with or without special preparation having a cross-section between 0,2 mm² and 120 mm² (AWG 24 and 250 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V a.c. up to 1 000 Hz or 1 500 V d.c., most commonly in conjunction with terminal blocks according to IEC 60947-7-1. This standard may be used as guide for
- protective conductor terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.;
- protective conductor terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc.
Where applicable in this standard, the term "clamping unit" has been used instead of the term "terminal". This is taken into account in case of reference to IEC 60947-1. The main technical modifications of this standard since this previous publication are listed below:
- requirements for tightening torques for the tests improved and referenced to Table 4 of IEC 60947-1, Annex B deleted;
- the wording of the short-time withstand current test improved in 8.4.6.

This publication shall be read in conjunction with IEC 60947-1:2007 and IEC 60947-7-1:2009.