CLC/TS 61643-12:2009

SLOVENSKI STANDARD
01-april-2010
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SIST-TS CLC/TS 61643-12:2007
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Low-voltage surge protective devices -- Part 12: Surge protective devices connected to
low-voltage power distribution systems - Selection and application principles
Überspannungsschutzgeräte für Niederspannung - Teil 12: Überspannungsschutzgeräte
für den Einsatz in Niederspannungsanlagen - Auswahl und Anwendungsgrundsätze
Parafoudres basse tension -- Partie 12: Parafoudres connectés aux réseaux de
distribution basse tension - Principes de choix et d'application
Ta slovenski standard je istoveten z: CLC/TS 61643-12:2009
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CLC/TS 61643-12
SPÉCIFICATION TECHNIQUE
December 2009
TECHNISCHE SPEZIFIKATION
ICS 29.240; 29.240.10 Supersedes CLC/TS 61643-12:2006

English version
Low-voltage surge protective devices -
Part 12: Surge protective devices connected to low-voltage power
distribution systems -
Selection and application principles
(IEC 61643-12:2008, modified)
Parafoudres basse tension -  Überspannungsschutzgeräte
Partie 12: Parafoudres connectés für Niederspannung -
aux réseaux de distribution basse tension - Teil 12: Überspannungsschutzgeräte
Principes de choix et d'application für den Einsatz
(CEI 61643-12:2008, modifiée) in Niederspannungsanlagen -
Auswahl und Anwendungsgrundsätze
(IEC 61643-12:2008, modifiziert)

This Technical Specification was approved by CENELEC on 2009-10-30.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to
make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting
national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TS 61643-12:2009 E

Foreword
This Technical Specification consists of the text of the International Standard IEC 61643-12:2008
prepared by SC 37A, Low-voltage surge protective devices, of IEC TC 37, Surge arresters, together
with the common modifications prepared by the Technical Committee CENELEC TC 37A, Low voltage
surge protective devices.
The text of the draft was circulated for voting in accordance with the Internal Regulations, Part 2,
Subclause 11.3.3.3 and was accepted by CENELEC as CLC/TS 61643-12 on 2009-10-30.
This Technical Specification supersedes CLC/TS 61643-12:2006.
The following date was fixed:
– latest date by which the existence of the CLC/TS
has to be announced at national level (doa) 2010-04-30
This Technical Specification is to be used in conjunction with EN 61643-11:2002.
__________
– 3 – CLC/TS 61643-12:2009
Contents
0 Introduction .6
0.1 General .6
0.2 Keys to understanding the structure of this Technical Specification .6
1 Scope .8
2 Normative references .8
3 Terms, definitions and abbreviated terms .9
3.1 Terms and definitions .9
3.2 List of variables and abbreviations used in this Technical Specification . 14
4 Systems and equipment to be protected . 15
4.1 Low-voltage power distribution systems . 15
4.2 Characteristics of the equipment to be protected . 18
5 Surge protective devices . 19
5.1 Basic functions of SPDs . 19
5.2 Additional requirements . 19
5.3 Classification of SPDs . 19
5.4 Characteristics of SPDs . 21
5.5 Additional information on characteristics of SPDs . 22
6 Application of SPDs in low-voltage power distribution systems . 27
6.1 Installation and its effect on the protection given by SPDs . 27
6.2 Selection of SPD . 35
6.3 Characteristics of auxiliary devices . 43
7 Risk analysis. 43
8 Co-ordination where equipment has both signalling and power terminals . 44
Annex A (informative) Examples of various SPD technologies . 45
A.1 Examples of internal circuits for one port and two port SPDs . 45
A.2 Response of SPDs to a combination wave impulse . 47
Annex B (informative) Explanation of testing procedures used in EN 61643-11 . 48
B.1 Determination of U for SPDs tested in accordance with class I and class II tests . 48
res
B.2 Impulse waveshape for assessment of U . 48
res
B.3 Influence of a back filter on determination of U . 48
res
B.4 Operating duty test for SPDs . 49
B.5 TOV failure test . 50
B.6 Differences in the testing conditions of Type 1 (test class I), 2 (test class II) and
3 (tests class III) SPDs . 50
B.7 Short-circuit withstand capability test in conjunction with overcurrent protection
(if any) . 51
Annex C (informative) Partial lightning current calculations . 52
Annex D (informative) Examples of application of CLC/TS 61643-12 . 54
D.1 Domestic application . 54
D.2 Industrial application . 55
D.3 Presence of a lightning protection system . 60
Annex E (informative) Examples of application of the risk analysis . 61
Annex F (informative) Consideration for SPDs when Type 1 SPDs are to be applied . 65
Annex G (informative) Immunity versus insulation withstand . 67

Annex H (informative) Examples of SPD installation in power distribution boards in some
countries . 69
Annex I (informative) Short circuit backup protection and surge withstand . 72
I.1 Introduction . 72
I.2 Information single shot 8/20 and 10/350 fuses withstand. . 72
I.3 Fuse influencing factors (reduction) for preconditioning and operating duty test . 73
I.4 Specific examples with estimated range of factors for reduction of single shot fuse
withstand. . 73
Annex J (informative) SPD coordination test principles . 75
J.1 Introduction . 75
J.2 Coordination criteria . 75
J.3 Coordination techniques . 75
J.4 Coordination test . 76
Annex K (informative) Simple calculation of I for a Type 1 SPD in case of a building
imp
protected by a LPS . 79
Bibliography . 81

Figures
Figure 1 – Examples of components and combinations of components . 20
Figure 2 – Relationship between U , U , U and U . 22
p 0 c cs
Figure 3 – Typical curve of U versus I for ZnO varistors . 25
res
Figure 4 – Typical curve for a spark gap . 25
Figure 5 – Flowchart for SPD application . 27
Figure 6 – Connection Type 1 . 29
Figure 7 – Connection Type 2 . 30
Figure 8 – Influence of SPD connecting lead lengths . 33
Figure 9 – Need for additional protection . 34
Figure 10 – Flowchart for the selection of an SPD . 35
Figure 11 – Typical use of two SPDs – Electrical drawing . 41
Figure A.1 – Examples of one-port SPDs . 45
Figure A.2 – Examples of two-port SPDs . 46
Figure A.3 – Response of one-port and two-port SPDs to a combination wave impulse . 47
Figure B.1 – Test setting . 50
Figure C.1 – Simple calculation of the sum of partial lightning currents into the power
distribution system . 52
Figure D.1 – Domestic installation . 55
Figure D.2 – Industrial installation . 58
Figure D.3 – Industrial installation circuitry . 59
Figure D.4 – Example for a lightning protection system . 60
Figure E.1 – HV and LV overhead lines .
...