Low voltage surge protective devices -- Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods

Is applicable to devices for surge protection of telecommunications and signalling etworks against indirect and direct effects of lightning or other transient overvoltages.

Überspannungsschutzgeräte für Niederspannung -- Teil 21: Überspannungsschutzgeräte für den Einsatz in Telekommunikations- und signalverarbeitenden Netzwerken - Leistungsanforderungen und Prüfverfahren

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

Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 21. del: Naprave, priključene na telekomunikacijska in signalna omrežja - Zahtevane lastnosti in preskusne metode (IEC 61643-21:2000/A1:2008, spremenjen)

Uporablja se za naprave za zaščito telekomunikacijskih in signalnih omrežij pred prenapetostnimi udari v primeru posrednih in neposrednih učinkov strele ali drugih prehodnih prenapetosti.

General Information

Status
Published
Publication Date
10-Sep-2009
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
26-Aug-2009
Due Date
31-Oct-2009
Completion Date
11-Sep-2009

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SLOVENSKI STANDARD
SIST EN 61643-21:2002/A1:2009
01-oktober-2009

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SULNOMXþHQHQDWHOHNRPXQLNDFLMVNDLQVLJQDOQDRPUHåMD=DKWHYDQHODVWQRVWLLQ
SUHVNXVQHPHWRGH ,(&$VSUHPHQMHQ

Low voltage surge protective devices -- Part 21: Surge protective devices connected to

telecommunications and signalling networks - Performance requirements and testing

methods

Überspannungsschutzgeräte für Niederspannung -- Teil 21: Überspannungsschutzgeräte

für den Einsatz in Telekommunikations- und signalverarbeitenden Netzwerken -
Leistungsanforderungen und Prüfverfahren

Parafoudres basse-tension -- Partie 21: Parafoudres connectés aux réseaux de signaux

et de télécommunications - Prescriptions de fonctionnement et méthodes d'essais
Ta slovenski standard je istoveten z: EN 61643-21:2001/A1:2009
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
SIST EN 61643-21:2002/A1:2009 en,fr

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

---------------------- Page: 1 ----------------------
SIST EN 61643-21:2002/A1:2009
---------------------- Page: 2 ----------------------
SIST EN 61643-21:2002/A1:2009
EUROPEAN STANDARD
EN 61643-21/A1
NORME EUROPÉENNE
April 2009
EUROPÄISCHE NORM
ICS 29.240; 29.240.10
English version
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)
Parafoudres basse-tension - Überspannungsschutzgeräte
Partie 21: Parafoudres connectés für Niederspannung -
aux réseaux de signaux Teil 21: Überspannungsschutzgeräte
et de télécommunications - für den Einsatz in Telekommunikations-
Prescriptions de fonctionnement und signalverarbeitenden Netzwerken -
et méthodes d'essais Leistungsanforderungen
(CEI 61643-21:2000/A1:2008, modifié) und Prüfverfahren
(IEC 61643-21:2000/A1:2008, modifiziert)

This amendment A1 modifies the European Standard EN 61643-21:2001; it was approved by CENELEC on

2009-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which

stipulate the conditions for giving this amendment the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language

made by translation under the responsibility of a CENELEC member into its own language and notified to the

Central Secretariat has the same status as the official versions.

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. EN 61643-21:2001/A1:2009 E
---------------------- Page: 3 ----------------------
SIST EN 61643-21:2002/A1:2009
EN 61643-21:2001/A1:2009 – 2 –
Foreword

The text of amendment 1:2008 to the International Standard IEC 61643-21:2000, prepared by

SC 37A, Low-voltage surge protective devices, of IEC TC 37, Surge arresters, together with common

modifications prepared by the Technical Committee CENELEC TC 37A, Low voltage surge protective

devices, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as

amendment A1 to EN 61643-21:2001 on 2009-03-01.

In this document the common modifications to IEC 61643-21:2000/A1:2008 are indicated by a vertical

line in the left margin of the text.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-03-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2012-03-01

Annex ZA, which was added by CENELEC, has been updated to reflect the changes in the normative

references.
__________
---------------------- Page: 4 ----------------------
SIST EN 61643-21:2002/A1:2009
– 3 – EN 61643-21:2001/A1:2009
Foreword
Delete the references to the annexes.
1.2 SPD configurations
Replace Figures 1a to 1f with:
X1
SPD
(V)
Figure 1a – Two-terminal SPD
SPD
SPD
X1 Y1
(V,I)
(V)
C X2
Figure 1b – Three-terminal SPD Figure 1c – Three-terminal SPD
X1 Y1
SPD
X1 Y1
SPD
(V,I)
X2 Y2
(V,I)
X2 Y2
Figure 1d – Four-terminal SPD Figure 1e – Five-terminal SPD
X1 Y1
SPD
(V,I)
Xn Yn
The common terminal C may not be provided.
Figure 1f – Multi-terminal SPD
---------------------- Page: 5 ----------------------
SIST EN 61643-21:2002/A1:2009
EN 61643-21:2001/A1:2009 – 4 –
1.3 Use of this standard
Replace the 5 paragraph with:

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.
Delete the last paragraph.
Replace Table 1 with:
Table 1 – General SPD requirements
Test Sub-
Requirement – Test Type of SPD
series clause
6.1
1 General test
Identification and
6.1.1 A A A A A A
documentation
6.1.2 A A A A A A
Marking
6.2.3
Transmission tests
6.2.3.1 A O O O A O
Capacitance
6.2.3.2 O A A A O A
Insertion loss
6.2.3.3 O O O A O O
Return loss
6.2.3.4 O O O A O O
Longitudinal balance
6.2.3.5 O O O O O O
Bit Error Ratio (BER)
Near-end crosstalk
6.2.3.6 O O O A O O
(NEXT)
6.3
Mechanical tests
Terminals and
6.3.1 A A A A A A
connectors
General testing
6.3.1.1 A A A A A A
procedure
Terminals with
6.3.1.2 A A A A A A
screws
6.3.1.3 A A A A A A
Screwless terminals
Insulating pierced
6.3.1.4 A A A A A A
connections
Pull-out-test on SPD
terminals designed
for single-core
6.3.1.4.1 A A A A A A
conductors
Pull-out-test on SPD
terminals designed
for multi-core cables
6.3.1.4.2 A A A A A A
and cords
Mechanical strength
6.3.2 A A A A A A
(mounting)
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 functions but
intended for use in
extended range
environment
---------------------- Page: 6 ----------------------
SIST EN 61643-21:2002/A1:2009
– 5 – EN 61643-21:2001/A1:2009
Table 1 (continued)
Test Sub-
Requirement – Test Type of SPD
series clause
Resistance to ingress
of solid objects and to
harmful ingress of
6.3.3 A A A A A A
water
Protection against
6.3.4 A A A A A A
direct contact
6.3.5 A A A A A A
Fire resistance
6.4
Environmental tests
High temperature and
6.4.1 O O O O A A
humidity endurance
Environmental cycling
6.4.2 O O O O A A
with impulse surges
Environmental cycling
6.4.3 O O O O A A
with a.c. surges
Voltage limiting
6.2.1
2 tests
Maximum continuous
6.2.1.1 A A A A A A
operating voltage (U )
6.2.1.2 A A A A A A
Insulation resistance
Impulse durability for
voltage limiting
6.2.1.6 A A A A A A
function
Impulse-limiting
6.2.1.3 A A A A A A
voltage
Impulse reset
6.2.1.4 A A A A A A
switching types
AC durability for
voltage limiting
6.2.1.5 O O O O O O
function
Blind spot test multi
6.2.1.8 A A A A A A
stage SPD
Overstressed fault
6.2.1.7 A A A A A A
mode
Current limiting
6.2.2
3 tests
6.2.2.1 N.A. A A A N.A. A
Rated current
6.2.2.2 N.A. A A A N.A. A
Series resistance
3 3
6.2.2.3 N.A. A N.A. A N.A. A
Current response time
3 3
6.2.2.4 N.A. A N.A. A N.A. A
Current reset time
Maximum interrupting
3 3
6.2.2.5 N.A. A N.A. A N.A. A
voltage
3 3
6.2.2.6 N.A. A N.A. A N.A. A
Operating duty test
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 functions but
intended for use in
extended range
environment
---------------------- Page: 7 ----------------------
SIST EN 61643-21:2002/A1:2009
EN 61643-21:2001/A1:2009 – 6 –
Table 1 (continued)
Test Sub-
Requirement – Test Type of SPD
series clause
AC durability for
current limiting
3 3
6.2.2.7 N.A. A N.A. A N.A. A
function
Impulse durability for
current limiting
3 3
6.2.2.8 N.A. A N.A. A N.A. A
function
6.5 O O O O O O
4 Acceptance tests
A Applicable.
N.A. Not applicable.
O Optional.
For each category of test impulse a new set of samples can be used.

It is admissible to measure the impulse-limiting voltage 6.2.1.3 while testing impulse durability 4.2.1.6.

Test not applicable if there is a linear component between its terminals.
Each test series is carried out on three samples.
2 Normative references
Add the following new references:

IEC 61643-12:2008, Low-voltage surge protective devices – Part 12: Surge protective devices

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

IEC 61643-22:2004, Low-voltage surge protective devices – Part 22: Surge protection devices

connected to telecommunications and signalling networks – Selection and application

principles

IEC 62305-4:2006, Protection against lightning – Part 4: Electrical and electronic systems

within structures

ITU-T Recommendation K.55:2002, Overvoltage and overcurrent requirements for insulation

displacement connectors (IDC) terminations

ITU-T Recommendation K.65:2004, Overvoltage and overcurrent requirements for termination

modules with contacts for test ports or SPDs
ITU-T Recommendation O.9:1999, Measuring arrangements to assess the degree of
unbalance about earth
Delete the dates from the following references:
IEC 60529, IEC 61000-4-5, IEC 61083-1 and IEC 61643-1.
Delete the following reference:

ITU-T Recommendation K.17:1988, Tests on power-fed repeaters using solid-state devices in

order to check the arrangements for protection from external interference
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 functions but
intended for use in
extended range
environment
---------------------- Page: 8 ----------------------
SIST EN 61643-21:2002/A1:2009
– 7 – EN 61643-21:2001/A1:2009
3 Definitions
Replace 3.8, 3.10, 3.14, 3.15 and 3.22 with:
3.8
surge protective device
SPD

device that restricts the voltage of a designated port or ports, caused by a surge, when it

exceeds a predetermined level

NOTE 1 Secondary functions may be incorporated, such as a current-limiting to restrict a terminal current.

NOTE 2 Typically the protective circuit has at least one non-linear voltage-limiting surge protective component.

NOTE 3 An SPD is a complete assembly, having terminals to connect to the circuit conductors.

3.10
current limiting

action of an SPD, containing at least one non-linear current-limiting component, that causes

currents exceeding a predetermined value to be restricted
3.14
voltage clamping type SPD

SPD that has high shunt impedance and will have a continuous reduction in impedance with

increasing current in response to a voltage surge exceeding the threshold level of the SPD

NOTE Examples of components used in voltage clamping type SPDs: varistors (e.g. MOV) and avalanche

breakdown diodes (ABD).
3.15
voltage switching type SPD

SPD that has a high shunt impedance and will have a sudden and large reduction in

impedance in response to a voltage surge exceeding the threshold level of the SPD

NOTE Examples of components used in voltage switching type SPDs: air gaps, gas discharge tubes (GDT) and

thyristor surge suppressors (TSS).
3.22
rated current

maximum current a current-limiting SPD can conduct continuously with no change in the

impedance of the current-limiting components
NOTE This is also applicable to linear series components.
Add the following new definition 3.32:
3.32
surge (telecommunications)

temporary excessive voltage or current, or both, coupled on a telecommunication line, from an

external electrical source
NOTE 1 Typical electrical sources are lightning and AC/DC power systems.

NOTE 2 Electrical source coupling can be one or more of the following; electric, magnetic, electromagnetic,

conductive.
---------------------- Page: 9 ----------------------
SIST EN 61643-21:2002/A1:2009
EN 61643-21:2001/A1:2009 – 8 –
4.1.1 Normal service conditions
Replace 4.1.1 as follows:
4.1.1.1 Air pressure and altitude

Air pressure is 80 kPa to 106 kPa. These values represent an altitude of +2 000 m to –500 m

respectively.
4.1.1.2 Ambient temperature
• normal range: –5 °C to +40 °C

NOTE 1 This range normally addresses SPDs for indoor use. This corresponds to code AB4 in

IEC 60364-5-51.
• extended range: –40 °C to +70 °C

NOTE 2 This range normally addresses SPDs for outdoor use in non weather-protected locations, class 3K7

in IEC 60721-3-3.
• storage range: –40 °C to +70 °C
NOTE 3 All values beyond will be specified by the manufacturer.
4.1.1.3 Relative humidity
• normal range: 5 % to 95 %

NOTE 1 This range normally addresses SPDs for indoor use. This corresponds to code AB4 in

IEC 60364-5-51.
• extended range: 5 % to 100 %

NOTE 2 This range normally addresses SPDs for outdoor use in non weather-protected locations (e.g. SPD

is contained in a weather proofed enclosure).
4.3 SPD testing
Replace the first two paragraphs by:

The SPDs covered by this standard shall be tested using the connections or terminations that

are used when the SPDs are installed in the field. Also, the measurements shall be made at

the connections or terminations of the SPDs. For those that are intended to be used with a

base or connector, that base or connector shall be part of the tests.

For telecommunication applications ITU-T gives requirements in the K-series for protection

holders (K.65) and termination modules (K.55).

When a base is used for testing, the measurements shall be made as close as possible to the

terminals of the SPD. Oscilloscopes used for measurements shall be in accordance with

IEC 61083-1.
NOTE For oscilloscope settings, see Annex D.

SPDs of Figures 1c, 1e and 1f may have a common current path (including protective

components or just internal connections) that conducts the total impulse current. The

manufacturer shall state the maximum value of impulse current for this current path. This

value of impulse current may be less than n times the maximum current capability of each line

terminal, where n equals the number of line terminals.

These SPDs shall have all of their line terminals tested simultaneously with respect to the

common terminal.
---------------------- Page: 10 ----------------------
SIST EN 61643-21:2002/A1:2009
– 9 – EN 61643-21:2001/A1:2009
5.2.1.1 Maximum continuous operating voltage (U )
Replace by:
5.2.1.1 Maximum continuous operating voltage (U )

The manufacturer shall state the maximum continuous operating voltage for the SPD appropriate for

the application such as AC rms or DC.
Compliance shall be checked in accordance with 6.2.1.1.
5.2.3 Transmission requirements
Replace by:
5.2.3 Transmission requirements

The SPD, in addition to the requirements of 5.2.1 and 5.2.2, may need to conform to specific

requirements of 5.2.3 depending on its communication and signalling application (for example, voice,

data, and video). Table 1 provides guidance in the selection of applicable transmission tests.

6.2.1.3 Impulse-limiting voltage
Replace the first paragraph by:

The SPDs shall be tested using one impulse selected from category C of Table 3 and applied

to the appropriate terminals. The current level shall be selected based on the energy

capability of the SPD as determined in the impulse durability test (see 6.2.1.6). Both impulse-

limiting voltage and impulse durability tests shall be performed with the same impulse. Values

listed in Table 3 are minimum requirements; other surge current ratings can be found in

standards e.g. ITU-T Recommendations.
Replace the fourth paragraph by:

Measure the voltage limitation for each impulse without load. The maximum voltage measured

at the appropriate terminals shall not exceed the specified voltage protection level (U ).

Sufficient time shall be allowed between impulses to prevent accumulation of heat. It is

understood that different SPDs will have different thermal characteristics, and consequently

will require different times between impulses.
For detail impulse recorders settings refer to Annex D.
---------------------- Page: 11 ----------------------
SIST EN 61643-21:2002/A1:2009
EN 61643-21:2001/A1:2009 – 10 –
Replace Table 3 by:
Table 3 – Voltage and current waveforms for impulse-limiting voltage
Category Type of test Open-circuit Short-circuit Minimum Terminals to be
voltage current number of tested
applications
A1 10 A, Not applicable X1 – C
≥ 1 kV
0,1 A/µs to (NA) X2 – C
Rate of rise from
X1 – X2
0,1 kV/µs to 2 A/µs,
Very slow rate
100 kV/s
≥ 1 000 µs
of rise
(duration)
A2 AC Select a test from Table 5 Single cycle
B1 1 kV 100 A, 300
10/1 000 10/1 000
B2 Slow rate 1 kV to 4 kV 25 A to 100 A 300
of rise 10/700 5/300
B3 10 A to 100 A 300
≥ 1 kV
10/1 000
100 V/µs
C1 0,5 kV to < 2 kV 0,25 kA to < 1 kA 300
1,2/50 8/20
C2 2 kV to 10 kV 1 kA to 5 kA 10
1,2/50 8/20
Fast rate
of rise
C3 10 A to 100 A 300
≥ 1 kV
10/1 000
1 kV/µs
D1 High energy ≥ 1 kV 0,5 kA to 2,5 kA 2
10/350

An open-circuit voltage different from 1 kV may be used. However, it must be sufficient to operate the SPD under

test.
X1 – X2 terminals shall be tested only if it is required.

NOTE 1 For the verification of Up, one of the above impulse waveform of category C is mandatory and A, B and D

are optional. Unless otherwise specified, apply 5 positive and 5 negative pulses.

NOTE 2 For impulse reset, select test from category B, C and D. Unless otherwise specified, apply 3 positive and

3 negative pulses.

NOTE 3 For impulse durability measurement, one impulse waveform of category C is mandatory and A1, B and D

are optional.

NOTE 4 Values listed in Table 3 are minimum requirements; other surge current ratings are possible and can also

be found in other standards e.g. ITU-T K series – Recommendations.
Add the following text (including new Figure 16) immediately after Table 3:
Simultaneous surge on all protected conductors

Multi-line SPDs may use a common protective element for the ground return of the total

impulse current. Two examples are shown in Figure 16. All the protected lines shall have an

impulse current equal to total impulse current divided by number of lines applied

simultaneously to verify that the common protective element had adequate current capability.

After this test the SPD shall not be degraded. This test also verifies that the internal

connections of the SPD have adequate current capability.
---------------------- Page: 12 --------
...

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