I.S. CLC TS 61643-12:2006

Introduction
Keys to understanding the structure of this standard
List of variables and abbreviations used in this standard
1 Scope
2 Normative references
3 Definitions
4 Systems and equipment to be protected
  4.1 Low-voltage power distribution systems
      4.1.1 Lightning overvoltages and currents
      4.1.2 Switching overvoltages
      4.1.3 Temporary overvoltages U[TOV]
  4.2 Characteristics of the equipment to be protected
5 Surge protective devices
  5.1 Basic functions of SPDs
  5.2 Additional requirements
  5.3 Classification of SPDs
      5.3.1 SPD: classification
      5.3.2 Typical design and topologies
  5.4 Characteristics of SPDs
      5.4.1 Service conditions described in EN 61643-11
      5.4.2 List of parameters for SPD selection
  5.5 Additional information on characteristics of SPDs
      5.5.1 Information related to power-frequency voltages
      5.5.2 Information related to surge currents
      5.5.3 Information related to voltage protection level
            provided by SPDs
      5.5.4 Information related to SPD failure modes
      5.5.5 Information related to short-circuit withstand
      5.5.6 Information related to load current I[L] and to
            voltage drop (for two-port SPDs or one-port SPDs
            with separate input and output terminals)
      5.5.7 Information related to change of characteristics of SPDs
6 Application of SPDs in low-voltage power distribution systems
  6.1 Installation and its effect on the protection given by SPDs
      6.1.1 Possible modes of protection and installation
      6.1.2 Influence of the oscillation phenomena on the
            protective distance
      6.1.3 Influence of the connecting lead length
      6.1.4 Need for additional protection
      6.1.5 Consideration regarding location of the SPD depending
            on the classes of test
      6.1.6 Protection zone concept
  6.2 Selection of SPD
      6.2.1 Selection of U[c], U[T] and I[n]/I[imp]/I[max]/U[oc]
            of the SPD System configuration of distribution network
      6.2.2 Protective distance
      6.2.3 Prospective life and failure mode
      6.2.4 Interaction between SPDs and other devices
      6.2.5 Choice of the voltage protection level U[p]
      6.2.6 Co-ordination between the chosen SPD and other SPDs
  6.3 Characteristics of auxiliary devices
      6.3.1 Disconnecting devices
      6.3.2 Event counters
      6.3.3 Status indicator
7 Risk analysis
8 Co-ordination where equipment has both signalling and power
  terminals
Annex A (informative) Examples of various SPD technologies
      A.1 Examples of internal circuits for one port and two
          port SPDs
      A.2 Response of SPDs to a combination wave impulse
Annex B (informative) Explanation of testing procedures used
        in EN 61643-11
      B.1 Determination of U[res] for SPDs tested in accordance
          with class I and class II tests
      B.2 Impulse waveshape for assessment of U[res]
      B.3 Influence of a back filter on determination of Ures
      B.4 Operating duty test for SPDs
      B.5 TOV failure test
      B.6 Differences in the testing conditions of Type 1 (test
          class I), 2 (test class II) and 3 (tests class III) SPDs
      B.7 short-circuit withstand capability test in conjunction
          with overcurrent protection (if any)
Annex C (informative) Partial lightning current calculations
Annex D (informative) Examples of application of TS 61643-12
      D.1 Domestic application
      D.2 Industrial application
      D.3 Presence of a lightning protection system
Annex E (informative) Examples of application of the risk analysis
Annex F (informative) Consideration for SPDs when Type 1 SPDs
        are to be applied
Annex G (informative) Immunity vs insulation withstand
Annex H (informative) Examples of SPD installation in power
        distribution boards in some countries
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Bibliography

Specifies the principles for selection, operation, location and co-ordination of SPDs to be connected to 50 Hz to 60 Hz a.c. power circuits and equipment rated up to 1 000 V r.m.s..