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 is applicable to devices for surge protection of telecommunications and signalling networks against indirect and direct effects of lightning or other transient overvoltages. The purpose of these SPDs is to protect modern electronic equipment connected to telecommunications and signalling networks with nominal system voltags up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c. The contents of the corrigendum of March 2001 have been included in this copy. This consolidated version consists of the first edition (2000) and its amendment 1 (2008). Therefore, no need to order amendment in addition to this publication.

Parafoudres basse tension - Partie 21: Parafoudres connectés aux réseaux de signaux et de télécommunications - Prescriptions de fonctionnement et méthodes d'essais

La CEI 61643-21:2000+A1:2008 est applicable aux dispositifs de protection (parafoudres) contre les effets directs et indirects de la foudre ou des autres surtensions transitoires, pour les réseaux de télécommunications et de transmission de signaux. Ces parafoudres sont destinés à protéger les équipements électroniques modernes, connectés aux réseaux de télécommunications et de transmission de signaux, ayant une tension nominale de fontionnement jusqu'à 1 000 V (efficace) en courant alternatif et 1 500 V en courant continu. Le contenu du corrigendum de mars 2001 a été pris en considération dans cet exemplaire.  Cette version consolidée comprend la première édition (2000) et son amendement 1 (2008). Il n'est donc pas nécessaire de commander l'amendement avec cette publication.

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Status
Published
Publication Date
28-Apr-2009
Current Stage
PPUB - Publication issued
Start Date
29-Apr-2009
Completion Date
29-Apr-2009
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IEC 61643-21
Edition 1.1 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low voltage surge protective devices –
Part 21: Surge protective devices connected to telecommunications and
signalling networks – Performance requirements and testing methods
Parafoudres basse tension –
Partie 21: Parafoudres connectés aux réseaux de signaux et de
télécommunications – Prescriptions de fonctionnement et méthodes d’essais
IEC 61643-21:2000+A1:2008
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61643-21
Edition 1.1 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low voltage surge protective devices –
Part 21: Surge protective devices connected to telecommunications and
signalling networks – Performance requirements and testing methods
Parafoudres basse tension –
Partie 21: Parafoudres connectés aux réseaux de signaux et de
télécommunications – Prescriptions de fonctionnement et méthodes d’essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.240; 29.240.10 ISBN 2-8318-9836-6
---------------------- Page: 3 ----------------------
– 2 – 61643-21 © IEC:2000+A1:2008
CONTENTS

FOREWORD...........................................................................................................................5

INTRODUCTION.....................................................................................................................7

1 General ............................................................................................................................8

1.1 Scope......................................................................................................................8

1.2 SPD configurations..................................................................................................8

1.3 Use of this standard ..............................................................................................10

2 Normative references .....................................................................................................13

3 Definitions ......................................................................................................................14

4 Service and test conditions.............................................................................................17

4.1 Service conditions .................................................................................................17

4.1.1 Normal service conditions..........................................................................17

4.1.2 Abnormal service conditions ......................................................................18

4.2 Test temperature and humidity ..............................................................................18

4.3 SPD testing ...........................................................................................................18

4.4 Waveform tolerances.............................................................................................19

5 Requirements .................................................................................................................19

5.1 General requirements............................................................................................19

5.1.1 Identification and documentation ...............................................................19

5.1.2 Marking .....................................................................................................19

5.2 Electrical requirements..........................................................................................20

5.2.1 Voltage-limiting requirements ....................................................................20

5.2.2 Current-limiting requirements ....................................................................21

5.2.3 Transmission requirements........................................................................22

5.3 Mechanical requirements.......................................................................................22

5.3.1 Terminals and connectors..........................................................................23

5.3.2 Mechanical strength (mounting).................................................................24

5.3.3 Resistance to ingress of solid objects and to harmful ingress of water .......24

5.3.4 Protection against direct contact................................................................24

5.3.5 Fire resistance...........................................................................................24

5.4 Environmental requirements ..................................................................................24

5.4.1 High temperature and humidity endurance.................................................24

5.4.2 Environmental cycling with impulse surges ................................................25

5.4.3 Environmental cycling with a.c. surges ......................................................25

6 Type test ........................................................................................................................25

6.1 General tests.........................................................................................................25

6.1.1 Identification and documentation ...............................................................25

6.1.2 Marking .....................................................................................................25

6.2 Electrical tests.......................................................................................................26

6.2.1 Voltage-limiting tests .................................................................................26

6.2.2 Current-limiting tests .................................................................................32

6.2.3 Transmission tests ....................................................................................35

6.3 Mechanical tests ...................................................................................................37

6.3.1 Terminals and connectors..........................................................................37

6.3.2 Mechanical strength (mounting).................................................................39

6.3.3 Resistance to ingress of solid objects and to harmful ingress of water .......39

6.3.4 Protection against direct contact................................................................39

---------------------- Page: 4 ----------------------
61643-21 © IEC:2000+A1:2008 – 3 –

6.3.5 Fire resistance...........................................................................................40

6.4 Environmental tests...............................................................................................41

6.4.1 High temperature and humidity endurance.................................................41

6.4.2 Environmental cycling with impulse surges ................................................41

6.4.3 Environmental cycling with a.c. surges ......................................................42

6.5 Acceptance tests...................................................................................................42

Annex A (informative) Devices with current-limiting components only ..................................56

Annex B (Void) .....................................................................................................................57

Annex C (Void) .....................................................................................................................58

Annex D (informative) Measurement accuracy .....................................................................59

Annex E (informative) Determination of let-through current (I )............................................60

Bibliography..........................................................................................................................63

Figure 1 – SPD configurations ................................................................................................9

Figure 16 – Examples of multi-line SPDs with a common protective element.........................28

Figure 2 – Test circuits for impulse reset time.......................................................................43

Figure 3 – Test circuits for a.c. durability and overstressed fault mode .................................44

Figure 4 – Test circuits for impulse durability and overstressed fault mode ...........................45

Figure 5 – Test circuits for rated current, series resistance, response time,

current reset time, maximum interrupting voltage and operating duty test .............................46

Figure 6 – Test circuits for a.c. durability ..............................................................................47

Figure 7 – Test circuits for impulse durability ........................................................................48

Figure 8 – Test circuits for insertion loss...............................................................................49

Figure 9 – Test circuit for return loss ....................................................................................49

Figure 10 – Test circuits for longitudinal balance ..................................................................50

Figure 11 – Test circuit for bit error ratio test ........................................................................51

Figure 12 – Test circuit for near-end crosstalk ......................................................................52

Figure 13 – Test circuits for high temperature/humidity endurance

and environmental cycling.....................................................................................................53

Figure 14 – Environmental cycling schedule A with RH ≥ 90 % .............................................54

Figure 15 – Environmental cycling B .....................................................................................55

Figure A.1 – Configurations of devices with current-limiting component(s) only.....................56

Figure E.1 – Determination of differential mode let-through current.......................................60

Figure E.2 – Determination of common mode let-through current ..........................................61

Figure E.3 – Determination of differential mode let-through current.......................................61

Figure E.4 – Determination of differential mode let-through current.......................................61

Figure E.5 – Determination of common mode max. let-through current .................................61

Figure E.6 – Determination of common mode max. let-through current

at multi-terminal SPDs ..........................................................................................................62

---------------------- Page: 5 ----------------------
– 4 – 61643-21 © IEC:2000+A1:2008

Table 1 – General SPD requirements....................................................................................11

Table 2 – Waveform tolerances.............................................................................................19

Table 3 – Voltage and current waveforms for impulse-limiting voltage...................................27

Table 4 – Source voltages and currents for impulse reset test ..............................................29

Table 5 – Preferred values of currents for a.c. durability test ................................................30

Table 6 – Test currents for response time.............................................................................32

Table 7 – Preferred values of current for operating duty tests ...............................................34

Table 8 – Preferred values of a.c. test currents.....................................................................34

Table 9 – Preferred values of impulse current.......................................................................35

Table 10 – Standard parameters for figure 8 .........................................................................35

Table 11 – Impedance values for longitudinal balance test....................................................36

Table 12 – Test times for BER test .......................................................................................37

Table 13 – Connectable cross-sectional areas of copper conductors

for screw-type terminals or screwless-type terminals ............................................................38

Table 14 – Pulling force (screwless terminals) ......................................................................38

Table 15 – Preferred values of test-time duration for high temperature

and humidity endurance........................................................................................................41

Table 16 – Preferred values of temperature and duration for environmental cycling tests......42

---------------------- Page: 6 ----------------------
61643-21 © IEC:2000+A1:2008 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––––
LOW VOLTAGE SURGE PROTECTIVE DEVICES –
Part 21: Surge protective devices connected to telecommunications
and signalling networks –
Performance requirements and testing methods
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61643-21 has been prepared by subcommittee 37A: Low-voltage

surge protective devices, of IEC technical committee 37: Surge arresters.

This consolidated version of IEC 61643-21 consists of the first edition (2000) [documents

37A/101/FDIS and 37A/104/RVD], its amendment 1 (2008) [documents 37A/200/FDIS and

37A/201/RVD] and its corrigendum of March 2001.

The technical content is therefore identical to the base edition and its amendment and has

been prepared for user convenience.
It bears the edition number 1.1.

A vertical line in the margin shows where the base publication has been modified by

amendment 1.
---------------------- Page: 7 ----------------------
– 6 – 61643-21 © IEC:2000+A1:2008

The committee has decided that the contents of the base publication and its amendments will

remain unchanged until the maintenance result date indicated on the IEC web site under

"http://webstore.iec.ch" in the data related to the specific publication. At this date,

the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 8 ----------------------
61643-21 © IEC:2000+A1:2008 – 7 –
INTRODUCTION

The purpose of this International Standard is to identify the requirements for Surge Protective

Devices (SPDs) used in protecting telecommunication and signalling systems, for example,

low-voltage data, voice, and alarm circuits. All of these systems may be exposed to the

effects of lightning and power line faults, either through direct contact or induction. These

effects may subject the system to overvoltages or overcurrents or both, whose levels are

sufficiently high to harm the system. SPDs are intended to provide protection against

overvoltages and overcurrents caused by lightning and power line faults. This standard

describes tests and requirements which establish methods for testing SPDs and determining

their performance.

The SPDs addressed in this International Standard may contain overvoltage protection

components only, or a combination of overvoltage and overcurrent protection components.

Protection devices containing overcurrent protection components only are not within the

coverage of this standard. However, devices with only overcurrent protection components are

covered in annex A.

An SPD may comprise several overvoltage and overcurrent protection components. All SPDs

are tested on a "black box" basis, i.e., the number of terminals of the SPD determines the

testing procedure, not the number of components in the SPD. The SPD configurations are

described in 1.2. In the case of multiple line SPDs, each line may be tested independently of

the others, but there may also be a need to test all lines simultaneously.

This standard covers a wide range of testing conditions and requirements; the use of some of

these is at the discretion of the user. How the requirements of this standard relate to the

different types of SPD is described in 1.3. Whilst this is a performance standard and certain

capabilities are demanded of the SPDs, failure rates and their interpretation are left to the

user. Selection and application principles are covered in IEC 61643-22.

If the SPD is known to be a single component device, it has to meet the requirements of the

relevant standard as well as those in this standard.
---------------------- Page: 9 ----------------------
– 8 – 61643-21 © IEC:2000+A1:2008
LOW VOLTAGE SURGE PROTECTIVE DEVICES –
Part 21: Surge protective devices connected to telecommunications
and signalling networks –
Performance requirements and testing methods
1 General
1.1 Scope

This International Standard is applicable to devices for surge protection of telecommunications

and signalling networks against indirect and direct effects of lightning or other transient

overvoltages.
The purpose of these SPDs is to protect modern electronic equipment connected to

telecommunications and signalling networks with nominal system voltages up to 1 000 V

(r.m.s.) a.c. and 1 500 V d.c.
1.2 SPD configurations

The SPD configurations described in this standard are shown in figure 1. Each SPD

configuration is composed of one or more voltage-limiting components and may include

current-limiting components.
---------------------- Page: 10 ----------------------
61643-21 © IEC:2000+A1:2008 – 9 –
SPD
(V)
IEC 549/08
Figure 1a – Two-terminal SPD
SPD SPD
X1 Y1
(V, I)
(V)
C X2
IEC 550/08 IEC 551/08
Figure 1b – Three-terminal SPD Figure 1c – Three-terminal SPD
X1 Y1
SPD
(V, I)
X2 Y2
X1 Y1
SPD
(V, I)
IEC 552/08
IEC 553/08
Figure 1d – Four-terminal SPD Figure 1e – Five-terminal SPD
SPD
(V, I )
IEC 554/08
The common terminal C may not be provided.
Figure 1f – Multi-terminal SPD
Key
V voltage-limiting component

V, I voltage-limiting components or a combination of voltage-limiting and current-limiting components

X1, X2....Xn line terminals
Y1, Y2…Yn protected line terminals
C common terminal
Figure 1 – SPD configurations
---------------------- Page: 11 ----------------------
– 10 – 61643-21 © IEC:2000+A1:2008
1.3 Use of this standard
This standard considers two basic types of SPD.

The first type of SPD contains at least one voltage-limiting component and no current-limiting

component(s) in a housing. All the SPD configurations of figure 1 can be of this type. These

SPDs shall satisfy the requirements of 5.1, 5.2.1 and 5.3 (see table 1). The SPDs shown in

figures 1b, 1d, 1e and 1f may contain a linear component between the line terminal and

the corresponding protected line terminal. These SPDs shall also satisfy the applicable

requirements of 5.2.2.

The second type of SPD contains both voltage-limiting and current-limiting components in a

housing. SPD configurations shown in figures 1b, 1d, 1e, and 1f are applicable for SPDs with

both voltage-limiting and current-limiting components. This type of SPD shall satisfy the

requirements of 5.1, 5.2.1, 5.2.2 and 5.3 (see table 1). Configurations of protective devices

having only current-limiting components are covered in annex A.

SPDs may need to satisfy additional requirements depending on the application. The

additional requirements are described in 5.2.3 and 5.4 (see table 1).

Subclause 5.2.3 provides transmission tests that SPDs may need to conform to, depending on

their communication and signalling application. Selection of the applicable transmission tests

from 5.2.3 shall be made, based on the intended application of the SPDs. Table 1 provides

general guidance on how to select the applicable transmission tests.

Subclause 5.4 provides the environmental requirements when the SPDs are intended only for

use in uncontrolled environments as described in 4.1. SPDs shall satisfy these requirements

after an agreement between the user and the manufacturer. Table 1 provides examples of

what requirements different types of SPD shall satisfy.
---------------------- Page: 12 ----------------------
61643-21 © IEC:2000+A1:2008 – 11 –
Table 1 – General SPD requirements
Test Sub-
Requirement – Test Type of SPD
series clause
1 General test 6.1
Identification and
documentation 6.1.1 A A A A A A
Marking 6.1.2 A A A A A A
Transmission tests 6.2.3
Capacitance 6.2.3.1 A O O O A O
Insertion loss 6.2.3.2 O A A A O A
Return loss 6.2.3.3 O O O A O O
Longitudinal balance 6.2.3.4 O O O A O O
Bit Error Ratio (BER) 6.2.3.5 O O O O O O
Near-end crosstalk (NEXT) 6.2.3.6 O O O A O O
Mechanical tests 6.3
Terminals and connectors 6.3.1 A A A A A A
General testing procedure 6.3.1.1 A A A A A A
Terminals with screws 6.3.1.2 A A A A A A
Screwless terminals 6.3.1.3 A A A A A A
Insulating pierced
connections 6.3.1.4 A A A A A A
Pull-out-test on SPD
terminals designed for
single-core conductors 6.3.1.4.1 A A A A A A
Pull-out-test on SPD
terminals designed for multi-
core cables and cords 6.3.1.4.2 A A A A A A
Mechanical strength
(mounting) 6.3.2 A A A A A A
Resistance to ingress of
solid objects and to harmful
ingress of water 6.3.3 A A A A A A
Protection against direct
contact 6.3.4 A A A A A A
Fire resistance 6.3.5 A A A A A A
SPD with only voltage-
limiting function
SPD with both voltage-
limiting and current-
limiting functions
SPD with voltage-
limiting function and
linear component
between its terminals
SPD having both
voltage-limiting and
current-limiting
functions with enhanced
transmission
capabilities
SPD having only
voltage-limiting function
but intended for use in
extended range
environment
SPD having both
voltage-limiting and
current-limiting
function
...

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