IEC 61643-21:2000/AMD2:2012

IEC 61643-21 ®
Edition 1.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
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/A2:2012
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IEC 61643-21 ®
Edition 1.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
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 R
ICS 29.240; 29.240.10 ISBN 978-2-83220-198-5

– 2 – 61643-21 Amend.2 © IEC:2012
FOREWORD
This amendment has been prepared by subcommittee 37A: Low-voltage surge protective
devices, of IEC technical committee 37: Surge arresters.
The text of this amendment is based on the following documents:
FDIS Report on voting
37A/236/FDIS 37A/237/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability 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• withdrawn,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.
_____________
61643-21 Amend.2 © IEC:2012 – 3 –
Table 1 – General SPD requirements
Replace existing Table 1 with the following new table:
Test Requirement – Test Sub- Type of SPD
d
series clause
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
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
intends for use in
extended range
environment
– 4 – 61643-21 Amend.2 © IEC:2012
Table 1 (continued)
Test Requirement – Test Sub- Type of SPD
d
series clause
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
Environmental tests 6.4
High temperature and
humidity endurance 6.4.1 O O O O A A
Environmental cycling
with impulse surges 6.4.2 O O O O A A
Environmental cycling
with AC surges 6.4.3 O O O O A A
2 Voltage limiting tests 6.2.1
Maximum continuous
operating voltage (Uc) 6.2.1.1 A A A A A A
Insulation resistance 6.2.1.2 A A A A A A
Impulse durability for
a
voltage limiting function 6.2.1.6 A A A A A A
b
Impulse-limiting voltage 6.2.1.3 A A A A A A
Impulse reset switching
types 6.2.1.4 A A A A A A
AC durability for voltage
a
limiting function 6.2.1.5 O O O O O O
Blind spot test multi stage
SPD 6.2.1.8 A A A A A A
Overstressed fault mode 6.2.1.7 O O O O O O
3 Current limiting tests 6.2.2
.e e
Rated current 6.2.2.1 A A A A A A
Series resistance 6.2.2.2 N.A. A A A N.A. A
c c
Current response time 6.2.2.3 N.A. A N.A. A N.A. A
c c
Current reset time 6.2.2.4 N.A. A N.A. A N.A. A
Maximum interrupting
c c
voltage 6.2.2.5 N.A. A N.A. A N.A. A
c c
Operating duty test 6.2.2.6 N.A. A N.A. A N.A. A
AC durability for current
a c c
limiting function 6.2.2.7 N.A. A N.A. A N.A. A
Impulse durability for
a c c
current limiting function 6.2.2.8 N.A. A N.A. A N.A. A
Acceptance tests
4 6.5 O O O O O O
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
intends for use in
extended range
environment
61643-21 Amend.2 © IEC:2012 – 5 –
Table 1 (continued)
A Applicable.
N.A. Not applicable.
O Optional.
a
For each category of test impulse a new set of samples can be used.
b
It is admissible to measure the impulse-limiting voltage 6.2.1.3 while testing impulse durability 6.2.1.6.
c
Test not applicable if there is a linear component between its terminals.
d
Each test series is carried out on three samples.
e
Applicable only for 4/5 terminal SPD (see fig. 1d and 1e)

2 Normative references
Replace the existing reference to IEC 60999-1:1999 with the following:
IEC 60999-1, Connecting devices – Electrical copper conductors – Safety requirements for
screw-type and screwless-type clamping units – Part 1: General requirements and particular

2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
Replace the existing reference to ITU-T Recommendation K.30:1993 with the following:
ITU-T Recommendation K.82, Characteristics and ratings of solid-state, self-restoring
overcurrent protectors for the protection of telecommunications installations
Add the following new references:
IEC 61643-11:2011, Surge protective devices connected to low-voltage power distribution
systems – Part 1: Performance requirements and testing methods
ITU-T Recommendation K.44: 2011, Resistibility tests for telecommunication equipment
exposed to overvoltages and overcurrents – Basic Recommendation
Delete the reference to ITU-T Recommendation K.65

3 Definitions
Replace the existing definition 3.11 with the following:
3.11
total discharge current I
Total
current which flows through the earthing terminal (common terminal C) of a multi-terminal
SPD during the total discharge current test.
NOTE This may also be called “Total surge current”.
Add the following new definitions:
3.33
nominal discharge current I
n
crest value of the current through the SPD having a current waveshape of 8/20

– 6 – 61643-21 Amend.2 © IEC:2012
3.34
rated surge current I
SM
maximum value of SPD impulse current with a defined waveshape
3.35
impulse discharge current I
imp
crest value of a discharge current (10/350) through the SPD

4.2 Test temperature and humidity
Replace the existing first paragraph with the following:
The SPDs shall be tested at a temperature of 25 °C ± 10 °C with relative humidity from 25 %
to 75 %.
If required by the manufacturer or customer, the SPDs shall be tested at the extreme
temperatures of the service temperature range selected for the intended application. The
selected temperature range may be narrower than the full range of 4.1 depending on the
application.
4.3 SPD testing
Replace the existing third paragraph with the following:
When a base is used for testing, the measurements shall be made as close as possible to the
terminals of the SPD base (termination module) intended for external connections. Waveform
recorders used for measurements shall have a minimum performance in accordance with
IEC 61083-1 with respect to the specific measurement.
NOTE For waveform recorders settings, see Annex D.

Replace the existing fourth paragraph with the following:
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 I . The
Total
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.

Delete the 5th paragraph of 4.3.

5.1.1 Identification and documentation
Replace items e), j), l) and m) with the following:
e) Maximum continuous operating voltage U (AC and/or DC)
c
61643-21 Amend.2 © IEC:2012 – 7 –
j) Impulse rating (according to Table 3 - category and corresponding parameters e.g. C2:
2k V/ 1kA)
l) Transmission characteristics (appropriate to the intended SPD use)
m) Additional information, where applicable:
• replaceable components,
• the u
...