Low-voltage surge protective devices - Part 22: Surge protective devices connected to telecommunications and signalling networks - Selection and application principles

IEC 61643-22:2015 describes the principles for the selection, operation, location and coordination of SPDs connected to telecommunication and signalling networks with nominal system voltages up to 1 000 V r.m.s. a.c. and 1 500 V d.c. This standard also addresses SPDs that incorporate protection for signalling lines and power lines in the same enclosure (so called multiservice SPDs). This second edition cancels and replaces the first edition published in 2004. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - Update the use of multiservice SPDs (Article 8); - Comparison between SPD classification of IEC 61643-11 and IEC 61643-21 (7.3.3); - Consideration of new transmission systems as PoE (Annex F); - EMC requirements of SPDs (Annex G); - Maintenance cycles of SPDs (Annex I). Keywords: SPD, surge protective devices

Überspannungsschutzgeräte für Niederspannung - Teil 22: Überspannungsschutzgeräte für den Einsatz in Telekommunikations- und signalverarbeitenden Netzwerken - Auswahl und Anwendungsprinzipien

Parafoudres basse tension - Partie 22: Parafoudres connectés aux réseaux de signaux et de télécommunications - Principes de choix et d'application

L'IEC 61643-22:2015 décrit les principes à utiliser pour le choix, le fonctionnement, la localisation et la coordination des parafoudres connectés aux réseaux de télécommunications et de transmission de signaux sous une tension nominale de réseau jusqu'à 1 000 V en valeur efficace en courant alternatif et 1 500 V en courant continu. La présente norme couvre aussi les parafoudres qui incorporent la protection pour les lignes de transmission de signaux et les lignes de puissance dans la même enveloppe (parafoudres dits parafoudres multifonctions. Cette deuxième édition annule et remplace la première édition parue en 2004. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - Mise à jour de l'utilisation des parafoudres multifonction (Article 8); - Comparaison entre les classifications de parafoudres de l'IEC 61643-11 et de l'IEC 61643-21 (7.3.3); - Prise en compte des nouveaux systèmes de transmission PoE (Annexe F); - Exigences de CEM des parafoudres (Annexe G); - Cycles de maintenance des parafoudres (Annexe I). Mots clès: parafoudres

Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 22. del: Naprave za zaščito pred prenapetostnimi udari, priključene na telekomunikacijska in signalna omrežja - Izbira in načela za uporabo

Standard IEC 61643-22:2015 opisuje načela za izbiro, delovanje, lego in usklajenost naprav za zaščito pred prenapetostnimi udari, priključenih na telekomunikacijska in signalna omrežja z nazivnimi omrežnimi napetostmi do 1000 V izmenične napetosti efektivne vrednosti in 1500 V enosmerne napetosti. Ta standard obravnava tudi naprave za zaščito pred prenapetostnimi udari, ki vključujejo zaščito za signalne vode in napajalne vode v istem ohišju (t. i. večnamenske naprave za zaščito pred prenapetostnimi udari). Druga izdaja razveljavlja in nadomešča prvo izdajo, objavljeno leta 2004. Ta izdaja tvori tehnično popravljeno izdajo. Ta izdaja vključuje naslednje znatne tehnične spremembe glede na prejšnjo izdajo:
– posodobitev uporabe večnamenskih naprav za zaščito pred prenapetostnimi udari (člen 8);
– primerjava razvrstitve naprav za zaščito pred prenapetostnimi udari iz standardov IEC 61643-11 in IEC 61643-21 (7.3.3);
– obravnavanje novih prenosnih sistemov kot naprav PoE – napajanje prek etherneta (dodatek F);
– zahteve za elektromagnetno združljivost za naprave za zaščito pred prenapetostnimi udari (dodatek G);
– vzdrževalni cikli naprav za zaščito pred prenapetostnimi udari (dodatek I).
Ključne besede: SPD, naprave za zaščito pred prenapetostnimi udari

General Information

Status
Published
Publication Date
17-Mar-2016
Current Stage
6060 - Document made available
Due Date
18-Mar-2016
Completion Date
18-Mar-2016

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SLOVENSKI STANDARD
SIST-TS CLC/TS 61643-22:2016
01-maj-2016
1DGRPHãþD
SIST-TS CLC/TS 61643-22:2007
1L]NRQDSHWRVWQHQDSUDYH]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDULGHO1DSUDYH
]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDULSULNOMXþHQHQDWHOHNRPXQLNDFLMVNDLQ
VLJQDOQDRPUHåMD,]ELUDLQQDþHOD]DXSRUDER

Low-voltage surge protective devices - Part 22: Surge protective devices connected to

telecommunications and signalling networks - Selection and application principles

Überspannungsschutzgeräte für Niederspannung - Teil 22: Überspannungsschutzgeräte

für den Einsatz in Telekommunikations- und signalverarbeitenden Netzwerken - Auswahl

und Anwendungsprinzipien

Parafoudres basse tension - Partie 22: Parafoudres connectés aux réseaux de signaux

et de télécommunications - Principes de choix et d'application
Ta slovenski standard je istoveten z: CLC/TS 61643-22:2016
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
SIST-TS CLC/TS 61643-22:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CLC/TS 61643-22:2016
---------------------- Page: 2 ----------------------
SIST-TS CLC/TS 61643-22:2016
TECHNICAL SPECIFICATION CLC/TS 61643-22
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
March 2016
ICS 29.240.01; 29.240.10 Supersedes CLC/TS 61643-22:2006
English Version
Low-voltage surge protective devices -
Part 22: Surge protective devices connected to
telecommunications and signalling networks - Selection and
application principles
(IEC 61643-22:2015 , modified)
Parafoudres basse tension - Überspannungsschutzgeräte für Niederspannung -

Partie 22: Parafoudres connectés aux réseaux de signaux Teil 22: Überspannungsschutzgeräte für den Einsatz in

et de télécommunications - Principes de choix et Telekommunikations- und signalverarbeitenden Netzwerken

d'application - Auswahl und Anwendungsprinzipien
(IEC 61643-22:2015 , modifiée) (IEC 61643-22:2015 , modifiziert)
This Technical Specification was approved by CENELEC on 2016-02-29.

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, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. CLC/TS 61643-22:2016 E
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SIST-TS CLC/TS 61643-22:2016
CLC/TS 61643-22:2016
European foreword

This document (CLC/TS 61643-22:2016) consists of the text of IEC 61643-22:2015 prepared

by SC 37A "Low-voltage surge protective devices" of IEC/TC 37 "Surge arresters", together with the

common modifications prepared by CLC/TC 37A "Low voltage surge protective devices".

This document supersedes CLC/TS 61643-22:2006.

CLCTS 61643-22:2016 includes the following significant technical changes with respect to

CLC/TS 61643-22:2006:
a) Update the use of multiservice SPDs (Article 8)
b) Comparison between SPD classification of EN 61643-11 and EN 61643-21 (7.3.3)
c) Consideration of new transmission systems as PoE (Annex F)
d) EMC requirements of SPDs (Annex G)
e) Maintenance cycles of SPDs (Annex I)

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying

any or all such patent rights.
Endorsement notice

The text of the International Standard IEC 61643-22:2015 was approved by CENELEC as a

European Standard with agreed common modifications.
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SIST-TS CLC/TS 61643-22:2016
CLC/TS 61643-22:2016
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
EN 61643-21:2001 + A1:2009 +A2:2013, Low voltage surge protective devices –

Part 21: Surge protective devices connected to telecommunications and signalling networks –

Performance requirements and testing methods (IEC 61643-21:2000 + A1:2008, modified

+A2:2012)

EN 61643-11, Low-voltage surge protective devices – Part 11: Surge protective devices

connected to low-voltage power systems - Requirements and test methods (IEC 61643-11)

EN 61643-12, Low-voltage surge protective devices – Part 12: Surge protective devices

connected to low-voltage power distribution systems – Selection and application principles

(IEC 61643-12)
EN 62305-1:2011, Protection against lightning – Part 1: General principles
(IEC 62305-1:2010, modified)
EN 62305-2:2012, Protection against lightning – Part 2: Risk management
(IEC 62305-2:2010, modified)

EN 62305-3:2011 Protection against lightning – Part 3: Physical damage to structures and life

hazard (IEC 62305-3:2010, modified)

EN 62305-4:2011 Protection against lightning – Part 4: Electrical and electronic systems

within structures (IEC 62305-4:2010, modified)

EN 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement

techniques – Surge immunity test (IEC 61000-4-5)
7.2 Coupling mechanisms
Replace Table 2 by the following:
Table 2 – Coupling mechanisms
Lightning to
Direct lightning to Lightning to ground Direct lightning
ground near
the structure near the structure to the line
Source of AC
the line
transients influence
(S1) (S2) (S3) (S4)
Coupling Resistive Induction Resistive Induction Resistive
Induction
(1) (2) (2) (1, 5) (3) (4)
Voltage wave-
– 1,2/50 1,2/50 – 10/700 50 Hz
shape (µs)
Current wave-
10/350 8/20 8/20 10/350 5/320 –
shape (µs)
Preferred
D1 C2 C2 D1 B2 A2
category
NOTE (1) – (5) see Figure 3, coupling mechanisms.

Also applies for capacitive/inductive couplings of switching in adjoining power supply networks.

See Table 3 of EN 61643-21:2001 + A1:2009 + A2:2013.

c The simulated direct lightning strike test impulse is described by the IEC as a peak current value and total

charge. A typical waveshape that can achieve these parameters is a double exponential impulse, 10/350 being

used in this example.
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SIST-TS CLC/TS 61643-22:2016
CLC/TS 61643-22:2016
7.3.1.3 Selection of SPDs to reduce transients
Replace Table 3 by the following:
Table 3 – Selection aid for rating SPDs for the use in (zone) interfaces
according to EN 62305-1
Lightning protection zone
LPZ 0/1 LPZ 1/2 LPZ 2/3
EN 62305-1
SPD (j)* D1 --- ---
Requirements to SPDs
(Category from Table 3,
SPD (k)* --- C2/B2 ---
EN 61643-21)
SPD (l)* --- --- C1
* SPD (j, k, l), see Figure 4.

NOTE The range of surge values indicated under LPZ 2/3 includes typical minimum resistibility requirements

and might be implemented into the equipment by market.
Annex B (informative) Current limiting components
B.2.3.2 Heat coils
Replace contents under B.2.3.2 as follows:

Heat coils are thermally activated mechanical components with normally a series and shunt

connection on the line being protected. Their function is to divert current at the circuit

connection point, thereby preventing this current from flowing through the protected

equipment, as shown in Figure B.3. Normally they are constructed using a grounding contact

held in its non-operative position by solder. A heat source, generally a coil of resistance wire

and a spring, force the grounding contact to ground when the solder melts.

The source of heat is the unwanted line current flowing through the coil of resistance wire.

The resistance of communication-type heat coils is typically 4,0 Ω, with a range between

0,4 Ω and 21 Ω. The contact arrangement is such that once the heat coil contacts are closed

(operated) the current flows to earth directly and bypasses the coils.

Heat coils are normally single-operating component. There is no means to restore the line to

its operating state other than the replacement of the item containing the heat coil. Heat coils

have been designed that are manually resettable, not requiring replacement of the SPD. Their

use is generally restricted for application in areas where induced currents from 50 Hz power

systems are frequent.

It is also possible to construct current-interrupting heat coils, which open circuit as a result of

overcurrent.
Time
DUT +i
Cabling &
Overcurrent
Equipment
Source
Current Sink
Figure B.3 – Thermally operated (heat coil) three-terminal shunt current limiter
Input
Output
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SIST-TS CLC/TS 61643-22:2016
CLC/TS 61643-22:2016
Annex J (informative) Earth potential rise (EPR)
J.2 Causes of EPR
Replace text under J.2 as follows:

Power related EPR is caused by a low frequency, 50 Hz fault current flowing through a ground

grid or the earth via a distribution line power cross to a tree or other earthing paths or utility

switching of power lines. The duration of this event may last from fractions of a second to

many minutes.

Lightning related EPR is caused by a fast rising current of many kA with rise times in nano

seconds to micro seconds and pulse widths in micro seconds to milli seconds flowing through

a ground grid or the earth.
Electrified railways also cause EPR.
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SIST-TS CLC/TS 61643-22:2016
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SIST-TS CLC/TS 61643-22:2016
IEC 61643-22
Edition 2.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage surge protective devices –
Part 22: Surge protective devices connected to telecommunications and
signalling networks – Selection and application principles
Parafoudres basse tension –
Partie 22: Parafoudres connectés aux réseaux de signaux et de
télécommunications – Principes de choix et d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.240.01; 29.240.10 ISBN 978-2-8322-2750-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 9 ----------------------
SIST-TS CLC/TS 61643-22:2016
– 2 – IEC 61643-22:2015  IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 6

INTRODUCTION ................................................................................................................... 8

1 Scope ............................................................................................................................ 9

2 Normative references..................................................................................................... 9

3 Terms, definitions and abbreviations .............................................................................. 9

3.1 Terms and definitions .......................................................................................... 10

3.2 Abbreviations ...................................................................................................... 10

4 Description of technologies .......................................................................................... 10

4.1 General ............................................................................................................... 10

4.2 Voltage-limiting components ................................................................................ 10

4.2.1 General ....................................................................................................... 10

4.2.2 Clamping components .................................................................................. 11

4.2.3 Switching components.................................................................................. 11

4.3 Current-limiting components ................................................................................ 11

4.3.1 General ....................................................................................................... 11

4.3.2 Current-interrupting components .................................................................. 11

4.3.3 Current-reducing components....................................................................... 11

4.3.4 Current-diverting components ....................................................................... 11

5 Parameters for selection of SPDs and appropriate tests from IEC 61643-21 .................. 12

5.1 General ............................................................................................................... 12

5.2 Normal service conditions ................................................................................... 12

5.2.1 General ....................................................................................................... 12

5.2.2 Air pressure and altitude .............................................................................. 12

5.2.3 Ambient temperature .................................................................................... 12

5.2.4 Relative humidity ......................................................................................... 12

5.2.5 Abnormal service conditions ......................................................................... 12

5.3 SPD parameters that may affect normal system operation .................................... 12

6 Risk management ........................................................................................................ 13

6.1 General ............................................................................................................... 13

6.2 Risk analysis ....................................................................................................... 14

6.3 Risk identification ................................................................................................ 14

6.4 Risk treatment ..................................................................................................... 14

7 Application of SPDs ..................................................................................................... 16

7.1 General ............................................................................................................... 16

7.2 Coupling mechanisms ......................................................................................... 16

7.3 Application, selection and installation of surge protective devices (SPDs) ............. 18

7.3.1 Application requirements for SPDs ............................................................... 18

7.3.2 SPD installation cabling considerations ........................................................ 22

7.3.3 Comparison between SPD classification of IEC 61643-11 and

IEC 61643-21 ............................................................................................... 25

8 Multiservice surge protective devices ........................................................................... 25

9 Coordination of SPDs/ITE ............................................................................................ 28

Annex A (informative) Voltage-limiting components ............................................................ 29

A.1 Clamping components ......................................................................................... 29

A.1.1 General ....................................................................................................... 29

A.1.2 Metal oxide varistor (MOV) ........................................................................... 29

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SIST-TS CLC/TS 61643-22:2016
IEC 61643-22:2015  IEC 2015 – 3 –

A.1.3 Silicon semi-conductors ............................................................................... 29

A.2 Switching components ......................................................................................... 31

A.2.1 General ....................................................................................................... 31

A.2.2 Gas discharge tube (GDT) ............................................................................ 31

A.2.3 Air gaps ....................................................................................................... 31

A.2.4 Thyristor surge suppressor (TSS) – Fixed voltage types (self-gating) ............ 32

A.2.5 Thyristor surge suppressor (TSS) – Gated types ........................................... 32

Annex B (informative) Current-limiting components ............................................................. 33

B.1 General ............................................................................................................... 33

B.2 Non-resetting current limiters .............................................................................. 33

B.2.1 General ....................................................................................................... 33

B.2.2 Series current-interrupting components ........................................................ 33

B.2.3 Shunt current-diverting limiters ..................................................................... 34

B.3 Self-resetting current limiters ............................................................................... 36

B.3.1 General ....................................................................................................... 36

B.3.2 Series current-reducing components ............................................................. 36

B.3.3 Shunt current-diverting components ............................................................. 38

Annex C (informative) Risk management ............................................................................ 39

C.1 Risk due to lightning discharges .......................................................................... 39

C.1.1 Risk assessment .......................................................................................... 39

C.1.2 Risk analysis................................................................................................ 39

C.1.3 Risk treatment ............................................................................................. 41

C.2 Risk due to power line faults ................................................................................ 42

C.2.1 General ....................................................................................................... 42

C.2.2 AC power systems ....................................................................................... 42

C.2.3 DC power systems ....................................................................................... 42

Annex D (informative) Transmission characteristics related to IT systems ........................... 44

D.1 General ............................................................................................................... 44

D.2 Telecommunications systems .............................................................................. 44

D.3 Signalling, measurement and control systems ...................................................... 45

D.4 Cable TV systems ............................................................................................... 45

Annex E (informative) Coordination of SPDs/ITE ................................................................ 46

E.1 General ............................................................................................................... 46

E.2 Determination of U and I ............................................................................... 46

IN IN

E.3 Determine the output protective voltage and current waveforms for SPD1 ............ 47

E.4 Compare SPD1 and SPD2 values ........................................................................ 47

E.5 Necessity of verification of the coordination by testing ......................................... 48

Annex F (informative) Protection of Ethernet systems ......................................................... 49

F.1 Power over Ethernet (PoE) .................................................................................. 49

F.2 Withstand capabilities and SPD coordination ....................................................... 50

F.3 Common mode to differential mode surge conversion by switching devices .......... 50

F.3.1 General ....................................................................................................... 50

F.3.2 Differential mode voltage reduction by inter-wire protection ........................... 51

F.3.3 Differential mode voltage reduction by single switching element .................... 52

Annex G (informative) EMC impact of SPDs ....................................................................... 54

G.1 General ............................................................................................................... 54

G.2 Electromagnetic immunity .................................................................................... 54

G.3 Electromagnetic emission .................................................................................... 54

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SIST-TS CLC/TS 61643-22:2016
– 4 – IEC 61643-22:2015  IEC 2015

Annex H (informative) Definition of internal port (Source: ITU-T K.44) ................................. 55

Annex I (informative) Maintenance of SPDs for Information Technology .............................. 56

I.1 General requirements .......................................................................................... 56

I.2 Maintenance responsibilities ................................................................................ 56

I.3 Maintenance of SPDs .......................................................................................... 56

I.3.1 General ....................................................................................................... 56

I.3.2 Visual inspection .......................................................................................... 57

I.3.3 Complete inspection ..................................................................................... 57

I.3.4 Examining periods ....................................................................................... 57

Annex J (informative) Earth potential rise (EPR) ................................................................. 59

J.1 General ............................................................................................................... 59

J.2 Causes of EPR ................................................................................................... 59

J.3 Influence of soil resistivity ................................................................................... 59

J.4 Fibre optics ......................................................................................................... 59

Annex K (informative) References and examples of risk management based on

IEC 62305-2 ................................................................................................................ 60

Bibliography ....................................................................................................................... 61

Figure 1 – SPD installation in telecommunications and signalling networks .......................... 15

Figure 2 – Measurement and Control network (MCR) ........................................................... 15

Figure 3 – Coupling mechanisms ........................................................................................ 17

Figure 4 – Example of a configuration of the lightning protection concept ............................. 19

Figure 5 – Example of a configuration according to the zones (Figure 4) .............................. 20

Figure 6 – Example of protection measures against common-mode voltages and

differential mode voltages of the data (f) and supply voltage input (g) of an ITE ................... 21

Figure 7 – Influence of voltages U and U on protection level U caused by
L1 L2 P

inductance of the leads ....................................................................................................... 22

Figure 8 – Removal of the voltages U and U from the protector unit by connecting
L1 L2

leads to a common point ..................................................................................................... 23

Figure 9 – Necessary installation conditions of a three, five or multi-terminal SPD with

an ITE for minimizing the interference influences on the protection level .............................. 24

Figure 10 – Individual SPDs ................................................................................................ 26

Figure 11 – MSPD with PE connection option ...................................................................... 26

Figure 12 – MSPD with transient bonding SPCs to PE terminals .......................................... 27

Figure 13 – Coordination of two SPDs ................................................................................. 28

Figure A.1 – Behaviour of clamping components ................................................................. 29

Figure A.2 – Behaviour of switching components ................................................................. 31

Figure B.1 – Behaviour of current interrupting components .................................................. 33

Figure B.2 – Behaviour of current-diverting component ........................................................ 34

Figure B.3 – Thermally operated (heat coil) three-terminal shunt current limiter .................... 35

Figure B.4 – Behaviour of current-reducing components (thermally operated type) ............... 36

Figure B.5 – Thermally operated (PTC thermistor) two-terminal series current limiting

component .......................................................................................................................... 37

Figure B.6 – Two-terminal series electronic current limiting component ................................ 38

Figure B.7 – Electronic (gated bidirectional thyristor) three-terminal shunt current

limiting component .............................................................................................................. 38

Figure C.1 – Risk evaluation procedure ............................................................................... 41

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SIST-TS CLC/TS 61643-22:2016
IEC 61643-22:2015  IEC 2015 – 5 –

Figure E.1 – Coordination verification process ..................................................................... 47

Figure F.1 – PoE powering modes ....................................................................................... 49

Figure F.2 – Common mode to differential mode surge conversion by asynchronous

SPD operation .................................................................................................................... 50

Figure F.3 – Differential surge generated by asynchronous SPD operation on a

longitudinal surge ............................................................................................................... 51

Figure F.4 – SPD circuit with inter-wire protection to limit the differential surge .................... 51

Figure F.5 – Differential surge voltage limited by inter-wire protection .................................. 52

Figure F.6 – SPD using a single switching element and a steering diode bridge ................... 52

Figure F.7 – Differential surge voltage reduced by single switching element and

steering diode bridge .......................................................................................................... 53

Table 1 – Responsibility for managing the protective measures ............................................ 14

Table 2 – Coupling mechanisms .......................................................................................... 18

Table 3 – Selection aid for rating SPDs for the use in (zone) interfaces according to

IEC 62305-1 ....................................................................................................................... 20

Table 4 – Relationship between SPD classification of IEC 61643-21 and IEC 61643-11

...

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