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• withdrawn,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 use of radioisotopes,
• ‘i ’ and ‘AC overstress current’ when impulse overstress test (6.2.1.7) is required
n
• surge currents as I , I , I I

SM n imp, Total
Add the following item to the end of the list:
o) (SPD-) Category and rating (if the category is printed on the SPD it is recommended to
C2
frame the category in a square. Example: )

5.1.2 Marking
Replace the existing first paragraph with the following:
The SPDs shall be clearly marked with 5.1.1 items: a) the manufacturer's name or trademark,
b) manufacturing traceability, c) model number, and e) the maximum continuous operating
voltage. The marking material shall be wipe resistant and resistant to solvents normally used
in the SPD application. The location can be under a cover of the enclosure, but shall be easily
accessible by the end user (e.g. no tools). Any notes for special handling shall be included in
the documentation or on the packaging. Compliance is checked in accordance with 6.1.2.

6.2.1 Voltage-limiting tests
Add the following text immediately after the subheading 6.2.1 Voltage-limiting tests:
If not otherwise specified, for all tests where a power supply at U or at the maximum
C
interrupting voltage is required, the voltage tolerance for testing shall be +0/-5 %. When DC is
used the maximum ripple shall not exceed 5 %. When AC is used tests shall be performed at
50 Hz or 60 Hz, except if otherwise specified by the manufacturer.
At all voltage-limiting tests it is required to test the common mode (X1-C, X2-C). Testing of
the differential mode (X1-X2) is optional.
NOTE Basic configurations for measuring U are listed in informative Annex F.
p
6.2.1.2 Insulation resistance
Replace the existing text with the following:
Insulation resistance shall be measured in both polarities at one pair of terminals at a time.
The test voltage shall be equal to Uc. If U of the SPD has AC and DC values, this device
c
shall be tested with DC If U of this SPD has only an AC value this device shall be tested with
c
DC. At this the DC voltage is calculated as U = U *√2. For polarised (polarity dependent)
dc C ac
constructions of DC SPDs the test shall be carried out in one polarity only. The current
conducted between the tested terminals shall be measured.

– 8 – 61643-21 Amend.2 © IEC:2012
The insulation resistance is equal to the applied test voltage at the device terminals divided
by the measured current and shall be higher than or equal to the value stated by the
manufacturer.
6.2.1.3 Impulse-limiting voltage
Replace the existing first paragraph with the following:
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 current carrying
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 K. series recommendations.
NOTE 1 Testing of the Impulse limiting voltage “U ” is not necessary for test categories A, B and D.
p
Delete the second paragraph.
Replace the existing third paragraph with the following:
Apply five negative and five positive impulses. The generator used shall have its open-circuit
voltage and short-circuit current selected from Table 3.
Replace the existing fifth paragraph with the following note:
NOTE 2 Detailed information about impulse recorder settings can be found in Annex D.
Replace the existing eighth paragraph with the following:
For SPDs that have a common current path (refer to 4.3), the voltage on the line terminals
where no impulse is applied shall be measured during the test and shall not exceed U .
p
61643-21 Amend.2 © IEC:2012 – 9 –
Table 3 – Voltage and current waveforms for impulse-limiting voltage
Replace Table 3 with the following:
Table 3 – Voltage and current waveforms for
impulse-limiting voltage and impulse durability
Category Type of test Open-circuit Short-circuit Minimum Terminals to be
a
voltage current number of tested
applications
A1 10 A, Not applicable X1 – C
≥ 1 kV
(NA) X2 – C
Rate of rise from
b
X1 – X2
0,1 kV/s to ≥ 1 000 µs
100 kV/s (duration)
Very slow rate
of rise
A2 AC Select a test from Table 5 Single cycle
B1 1 kV 100 A, 300
10/1000 10/1000
B2 1 kV to 4 kV 25 A to 100 A 300
Slow rate
10/700 5/320
of rise
B3 ≥ 1 kV 10 A to 100 A 300
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
C3 ≥ 1 kV 10 A to 100 A 300
of rise
10/1 000
1 kV/µs
D1 0,5 kA to 2,5 kA 2
≥ 1 kV
10/350
High energy
0,6 kA to 2,0 kA
D2 5
≥ 1 kV
10/250
a
An open-circuit voltage different from 1 kV may be used as long as  the SPD under test operates.
b
X1 – X2 terminals are tested only if required.
For the verification of U , only one impulse waveform of category C is mandatory. Apply 5 positive and 5 negative
p
impulses.
For impulse durability measurement, one impulse waveform of category C is mandatory and A1, B and D are
optional.
B1, B2, C1, C2 and D2 are voltage driven tests and therefore the column "Short-circuit current” shows the
prospective short-circuit current at the DUT connection point. Categories B3, C3 and D1 are current driven tests,
therefore the required test current is adjusted through the DUT. The max. waveform tolerances as listed in table 2
shall not be exceeded.For the voltage driven tests the effective output impedance of the generators used shall be 10
Ohms for Category B1, 40 Ohms for Category B2 and 2 Ohms for Categories C1, C2 and D2.
NOTE Values listed in Table 3 are minimum requirements.

Delete the existing text below Table 3 (including Figure 16).

6.2.1.4 Impulse reset
Replace the existing first paragraph with the following:

– 10 – 61643-21 Amend.2 © IEC:2012
The SPD shall be connected as shown in Figure 2. The impulse reset voltage and current
values shall be taken from the manufacturer's datasheet or shall be based on the
voltage/current combinations listed in Table 4 following the manufacturer's instructions. These
power sources represent commonly used system values. AC SPDs have to be tested with AC,
DC SPDs have to be tested with DC, and AC/DC SPDs have to be tested with DC Depending
on the construction of DC SPDs the test can be carried out only in one polarity. If an AC test
is performed the impulse generator must be syncronized with the phase of the AC voltage
(typically at a phase angle between 30° and 60°).
Replace the existing second paragraph with the following:
For the impulse voltage and current waveform either Category B1 or C1 shall be selected
from Table 3. The peak open-circuit voltage shall be sufficient to ensure that the voltage-
switching component(s) of the SPD operates. The polarity of the impulse voltage shall be the
same as the polarity of the voltage source. The reset time is defined as the time from
application of the impulse to the return of the SPD to its high-impedance state.
Replace the existing third paragraph with the following:
One positive and one negative impulse shall be applied at an interval not greater than 1 min,
and the reset time shall be measured for each impulse.
NOTE The polarity of the diodes in a decoupling device (figure 2) must be reversed when the polarity of the DC
power supplies and surge generator are reversed.

Table 4 – Source voltages and currents for impulse reset test
Replace Note b of Table 4 with the following:
b
Tolerance (including ripple) +/- 1%

6.2.1.5 AC durability for voltage limiting function
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 3. The AC short-circuit current shall be
selected from Table 5. Apply the currents for the specified number of applications with time
between applications sufficient to prevent accumulation of heat in the device under test. The
applied AC test voltage shall be of sufficient magnitude to cause a full conduction of the
voltage limiting component(s) of the SPD. Prior to testing and after completion of the required
number of AC applications, the SPD shall meet the requirements of 5.2.1.2, 5.2.1.3, 5.2.1.4 (if
applicable) and 5.2.2.2.
Replace the existing third paragraph with the following:
If required by the manufacturer or customer, the currents may be applied additionally to
terminals X1 – X2 of SPDs shown in figures 1c), 1e) and 1f).
Replace the existing fourth paragraph with the following:
For tests on the SPDs shown in figures 1c), 1e) and 1f), each pair of terminals (X1 – C and
X2 – C) may be tested separately.
Replace the existing fifth paragraph with the following:

61643-21 Amend.2 © IEC:2012 – 11 –
For SPDs that have a common current path, refer to 4.3. Otherwise, for multi-terminal SPDs
test each line terminal to common terminal separately.

6.2.1.6 Impulse durability for voltage limiting function
Replace the existing fourth paragraph with the following:
For tests on the SPDs shown in Figures 1c) and 1e), each pair of terminals (X1 – C and X2 –
C) may be tested separately. For tests on the SPD shown in Figure 1f) it is sufficient to select
two terminals as a representative sample, provided all terminals have the same protective
circuit to terminal C.
Delete the 5th paragraph
Add the following new subclause:
6.2.1.6.1 Additional test for Multi-terminal SPDs
If the manufacturer declares a total impulse current the test according 6.2.1.6 shall be
repeated with the following modification and additions.
This test is not required if the SPD’s total impulse current capability is equal to the single line
impulse current capability (e.g . total impulse current = 10 kA, single line impulse current =
10 kA).
Multi-terminal SPDs (fig. 1c, 1f, 1e) may have the total impulse current (I ) flowing through
Total
common components and connections to the earthing terminal. Two examples are shown in
Figure 16. All the protected lines shall have an impulse current equal to the total impulse
current divided by the number of lines, applied simultaneously to verify that the common
current path has sufficient current capability. After this test the SPD shall not be degraded.
This test also verifies that the internal connections of the SPD have sufficient current
capability.
The coupling network shall not substantially influence the test impulse. The permissible
deviation from the 8/20 waveform of the test impulse for categories C1 and C2 shall not
exceed an 8/25 waveform with a tolerance of +/- 30% for both the front time and the time to
half value.
NOTE If it is not possible to reach the above waveform parameters the test may be performed with modified SPDs
provided by the manufacturer, where every “individual protective element” (1) of the star protection circuit shown in
Figure 16 is short circuited. During the test all input terminals X1 to Xn are connected together.

6.2.1.7 Overstressed fault mode
Replace the existing second paragraph with the following:
Insulation resistance, voltage-limiting and series resistance tests shall be performed as
applicable to determine if the SPD has reached an acceptable overstressed fault mode as
described in 3.3. The SPD shall reach its overstressed fault mode in a safe manner without
causing a fire hazard, an explosion hazard, an electrical hazard or emission of toxic fumes.
NOTE 1 For multistage SPDs different fault modes are allowed. (e.g. X1 - C could have a mode 2 and the X1 – X2
could have mode 1)
Add the following note after the fourth paragraph:

– 12 – 61643-21 Amend.2 © IEC:2012
NOTE 2 If i exceeds the capability of the hybrid generator a pure 8/20 current generator shall be used. The peak
n
current flowing through the SPD shall be adjusted to the value of the specified and calculated surge current i .”
n
Replace the existing fifth paragraph with the following:
AC overstress
The SPD shall be connected as shown in Figure 3. The AC overstress current shall be
specified by the manufacturer. The current shall be applied for 15 min. The open-circuit
voltage, 50 Hz or 60 Hz, shall have sufficient magnitude to cause a full conduction of the
SPD.
NOTE 3 The adjusted test current is the short-circuit current of the source.

6.2.1.8 Blind spot test
Replace item a) with the following:
a) Select the same impulse waveform used to determine U (see 6.2.1.3). During the
p
application of this impulse, measure the impulse-limiting voltage and the voltage-time
waveform with an oscilloscope.

6.2.2.1 Rated current
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The source capability shall be sufficient to
supply the rated current. The frequency shall be 0 (DC) or 50 Hz or 60 Hz. AC SPDs have to
be tested with AC, DC SPDs have to be tested with DC, and AC/DC SPDs have to be tested
with DC.
6.2.2.2 Series resistance
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The test source voltage shall be U . The
c
frequency shall be 0 (DC) or 50 Hz or 60 Hz. AC SPDs have to be tested with AC, DC SPDs
have to be tested with DC, and AC/DC SPDs have to be tested with DC.

6.2.2.3 Current response time
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The source voltage shall be U . The
c
frequency shall be either 0 Hz (DC) or 50 Hz or 60 Hz AC SPDs have to be tested with AC,
DC SPDs have to be tested with DC, and AC/DC SPDs have to be tested with DC.

61643-21 Amend.2 © IEC:2012 – 13 –
6.2.2.4 Current reset time
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The source voltage shall be U . The
c
frequency shall be 0 (DC), 50 Hz or 60 Hz. AC SPDs have to be tested with AC, DC SPDs
have to be tested with DC, and AC/DC SPDs have to be tested with DC.

6.2.2.5 Maximum interrupting voltage
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The test voltage shall be the maximum
interrupting voltage as specified by the manufacturer. The frequency shall be 0 (DC) or 50 Hz
or 60 Hz. AC SPDs have to be tested with AC, DC SPDs have to be tested with DC, and
AC/DC SPDs have to be tested with DC.

6.2.2.6 Operating duty test
Replace the existing first paragraph with the following:
The SPD shall be connected as shown in Figure 5. The test voltage shall be the maximum
interrupting voltage as specified by the manufacturer. The frequency shall be 0 (DC) or 50 Hz
or 60 Hz. AC SPDs have to be tested with AC, DC SPDs have to be tested with DC, and
AC/DC SPDs have to be tested with DC.

Table 9 – Preferred values of impulse current
Replace existing Table 9 by the following:

Open-circuit voltage Short-circuit current Number of applications Test terminals
1 kV 100 A, 10/1000 30 X1 – C
X2 – C
X1 – X2
1,5 kV, 10/700 37,5 A, 5/300 10
Maximum interrupting 25 A, 10/1000 30
voltage
Maximum interrupting ITU-T Recommendation 10
voltage K.44, Fig. A.3-1
(R=25Ohm)
4 kV, 1,2/50 2 kA, 8/20 10
6.4.1 High temperature and humidity endurance
Replace the existing first paragraph with the following:

– 14 – 61643-21 Amend.2 © IEC:2012
The SPD shall be exposed to high temperature and relative humidity conditions for a duration
selected from table 15. The temperature shall be 80 °C +/- 2K. The relative humidity shall be
between 90 % and 96 %.
61643-21 Amend.2 © IEC:2012 – 15 –
Figure 2 – Test circuits for impulse reset time
Replace the existing figure by the following:
X1
IE IE V, I Y1
X1
D D
C
R R
s s
G V G
O O
E E
X2
X1
IE
V
C
IE
X2
D D
1 2
R R
s1 s2
G
O O
1 2
E
E
IE
D
X1 Y1
R
s
G
V, I
X2 Y2
O
E
IE
X1 Y1
V, I
X2 Y2
IE
C
D D
1 2
R R
s1 s2
G
O O
1 2
E E
IEC  1186/12
Key
O, O , O oscilloscopes V voltage-limiting component

1 2
E, E1, E2 DC or AC voltage sources V, I voltage-limiting components or combination of
voltage-limiting and current-limiting components
G impulse generator
X1, X2 line terminals
IE isolation element
Y1, Y2 protected line terminals
R , R , R non-inductive source resistors

s s1 s2
C Common terminal
, D diodes are used at
D, D
1 2
DC sources,
decoupling elements are used
at AC sources
– 16 – 61643-21 Amend.2 © IEC:2012
Add the following new Figure 16 immediately after existing Figure 15:

Xn
Yn Xn Yn
X2
Y2 X2 Y2
X1
Y1 X1 Y1
C C C C
IEC  555/08 IEC  556/08
Star protection circuit Diode steering bridge
Key
X1, X2, Xn, Line terminals 1 Individual protective element
Y1, Y2, Yn, Protected line terminals 2 Common protective element
C Common
Figure 16 – Examples of multi-terminal SPDs with a common current path

Add the following new annexes after Annex E:

61643-21 Amend.2 © IEC:2012 – 17 –
Annex F
(informative)
Basic configurations for measuring U
p
X1
X1
V
U V C U
P P
X2
X2
X1
Y1
X1 Y1
V, I
V, I U
P
U
P
X2 Y2
C
C
Y1
X1
Y2
XA X2 YA
X1 Y1 U
V, I
P
U
V, I XB Xn Yn YB
P
X2 Y2
C*
IEC  1187/12
NOTE 1 XA and XB are the surge generator connections, which are sequentially connected to the terminal pairs
formed by X1, X2 through to Xn.
NOTE 2 YA and YB connect to the associated Y terminal pair of the tested X terminal pair to measure U .
P
NOTE 3 -------- Possible link to C terminal used for ITU-T test setups.
Figure F.1 – Differential Mode U measurement of Figure 1 SPDs
P
X1
R1
X1 Y1
R1
V, I
V C U
PY1
R2 X2 Y2
U
PY2
U
PX1
R2
C
X2
U
PX2
R1
X1 Y1
X2 Y2
U
PY1
V, I
U
PY2
Xn Yn
Rn
U
PYn
C
IEC  1188/12
NOTE 4 R1 through Rn are impulse current sharing resistors (may be internal or external)
Figure F.2 – ITU-T test setup for SPD Common Mode U measurement to C terminal
P
– 18 – 61643-21 Amend.2 © IEC:2012
Annex G
(informative)
Special resistibility in telecommunication systems

Special resistibility may be required when mains SPDs cannot be installed and when bonding
between the mains and telecommunication systems cannot be achieved.
For example, ITU-T K.44 requires a B2 impulse with an open circuit voltage of 13 kV and a
short-circuit current of 325 A.

61643-21 Amend.2 © IEC:2012 – 19 –
Bibliography
Add the following references:
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60664-2-1:2011, Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of the IEC 60664 series,
dimensioning examples and dielectric testing
ITU-T Recommendation K.45:2008, Resistibility of telecommunication equipment installed in
the access and trunk networks to overvoltages and overcurrents
ITU-T Recommendation K.65:2011, Overvoltage and overcurrent requirements for termination
modules with contacts for test ports or surge protective devices
Delete the reference to ITU-T Recommendation K.44:2011.

_____________
– 20 – 61643-21 Amend.2 © CEI:2012
AVANT-PROPOS
Le présent amendement a été établi par le sous-comité 37A: Dispositifs de protection basse
tension contre les surtensions, du comité d'études 37 de la CEI: Parafoudres.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
37A/236/FDIS 37A/237/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cet amendement.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant la date de
stabilité indiquée sur le site web de la CEI sous "http://webstore.iec.ch" dans les données
relatives à la publication recherchée. A cette date, la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
_____________
61643-21 Amend.2 © CEI:2012 – 21 –
Tableau 1 – Exigences générales des parafoudres
Remplacer le Tableau 1 existant par la nouvelle table suivante:
Série
Paragra
d'essai Exigence – Essai Type de parafoudres
d phe
1 Essai général 6.1
Identification et
documentation 6.1.1 A A A A A A

Marquage 6.1.2 A A A A A A
Essais d'émission 6.2.3
Capacité 6.2.3.1 A O O O A O
Perte d’insertion 6.2.3.2 O A A A O A

Affaiblissement de
réflexion 6.2.3.3 O O O A O O
Affaiblissement de
conversion longitudinale
(ACL) 6.2.3.4 O O O A O O
Taux d’erreur binaire
(TEB) 6.2.3.5 O O O O O O
Paradiaphonie 6.2.3.6 O O O A O O

Essais mécaniques 6.3
Bornes et connecteurs 6.3.1 A A A A A A

Procédure générale
d'essai 6.3.1.1 A A A A A A
Bornes à vis 6.3.1.2 A A A A A A

Bornes sans vis 6.3.1.3 A A A A A A

Connexions à perçage
d’isolant 6.3.1.4 A A A A A A
Essai de traction sur
des bornes de
parafoudres conçus
pour des mono-
conducteurs 6.3.1.4.1 A A A A A A

Essai de traction pour
des parafoudres conçus
pour des câbles
multiconducteurs et des
cordons 6.3.1.4.2 A A A A A A
Résistance mécanique
(montage) 6.3.2 A A A A A A
Parafoudre limiteur de
tension
Parafoudre limiteur de
tension et limiteur de
courant
Parafoudre limiteur de
tension et ayant un
composant linéaire entre
ses bornes
Parafoudre limiteur de
tension et de courant
ayant des capacités
d'émission améliorées
Parafoudre limiteur de
tension mais destiné à un
environnement à
conditions étendues
Parafoudre limiteur de
tension et de courant
mais destiné à un
environnement à
conditions étendues
– 22 – 61643-21 Amend.2 © CEI:2012
Tableau 1 (suite)
Série Paragra
Exigence – Essai Type de parafoudres
d
d'essai phe
Résistance à
l’introduction de corps
solides et à l'introduction
nocive de l’eau 6.3.3 A A A A A A

Protection contre les
contacts directs 6.3.4 A A A A A A

Résistance au feu 6.3.5 A A A A A A

Essais
d'environnement
6.4
Endurance à haute
température et haute
humidité 6.4.1 O O O O A A
Conditions d’ambiance
cyclées avec impulsions
transitoires 6.4.2 O O O O A A

Conditions d’ambiance
cyclées avec chocs en
courant alternatif 6.4.3 O O O O A A

Essais de limitation en
tension 6.2.1
Tension maximale de
service permanent (Uc) 6.2.1.1 A A A A A A

Résistance d'isolement 6.2.1.2 A A A A A A

Endurance aux
impulsions pour la
fonction limitation de
a
tension 6.2.1.6 A A A A A A
Tension de limitation
b
impulsionnelle 6.2.1.3 A A A A A A

désamorçage sur
impulsion pour type à
coupure 6.2.1.4 A A A A A A
Endurance en courant
alternatif pour la
fonction limitation de
a
tension 6.2.1.5 O O O O O O
Essai du point aveugle
pour parafoudre étagé 6.2.1.8 A A A A A A

Mode de défaut par
surcharge 6.2.1.7 O O O O O O
Parafoudre limiteur de
tension
Parafoudre limiteur de
tension et de courant
Parafoudre limiteur de
tension et ayant un
composant linéaire entre
ses bornes
Parafoudre limiteur de
tension et de courant
ayant des capacités
d'émission améliorées
Parafoudre limiteur de
tension mais destiné à un
environnement à
conditions étendues
Parafoudre limiteur de
tension et de courant
mais destiné à un
environnement à
conditions étendues
61643-21 Amend.2 © CEI:2012 – 23 –
Tableau 1 (suite)
Série Paragra
Exigence – Essai Type de parafoudres
d
d'essai phe
Essais de limitation en
courant 6.2.2
e e
Courant assigné 6.2.2.1 A. A A A A . A

Résistance série 6.2.2.2 N.A. A A A N.A. A

c
Temps de réponse en A
c
courant 6.2.2.3 N.A. A N.A. A N.A.

c
Temps de réamorçage A
c
en courant 6.2.2.4 N.A. A N.A. A N.A.

c
Tension maximale de A
c
coupure 6.2.2.5 N.A. A N.A. A N.A.

c c
Essai de fonctionnement 6.2.2.6 N.A. A N.A. A N.A. A

c
Endurance en courant A
alternatif pour la
fonction de limitation de
a c
courant 6.2.2.7 N.A. A N.A. A N.A.

c
Endurance A
impulsionnelle pour la
fonction de limitation de
a c
courant 6.2.2.8 N.A. A N.A. A N.A.

Essais de réception 6.5 O O O O O O
A S'applique.
N.A. Ne s'applique pas.
O Facultatif.
a
Pour chaque catégorie d'impulsion d'essai, un nouveau lot d'échantillons peut être utilisé.
b
Il est admis de mesurer la tension de limitation impulsionnelle 6.2.1.3 au cours de l'essai de l'endurance
impulsionnelle 6.2.1.6.
c
L'essai ne s'applique pas en présence d'un composant linéaire entre ses bornes.
d
Chaque série d’essai est réalisée sur trois échantillons.
e
Applicable aux parafoudres à 4 ou 5 borne (voir fig. 1d et 1e).
2 Références normatives
Remplacer la référence existante à la CEI 60999-1:1999 par ce qui suit:
CEI 60999-1, Dispositifs de connexion – Conducteurs électriques en cuivre – Prescriptions de
sécurité pour organes de serrage à vis et sans vis – Partie 1: Prescriptions générales et
2 2
particulières pour les organes de serrage pour les conducteurs de 0,2 mm à 35 mm (inclus)
Remplacer la référence existante à la Recommandation ITU-T K.30:1993 par ce qui suit:
Recommandation ITU-T K.82, Caractéristiques des dispositifs à semi-conducteurs et à auto-
rétablissement pour la protection des installations de télécommunication contre les
surintensités
Parafoudre limiteur de
tension
Parafoudre limiteur de
tension et de courant
Parafoudre limiteur de
tension et ayant un
composant linéaire entre
ses bornes
Parafoudre limiteur de
tension et de courant
ayant des capacités
d'émission améliorées
Parafoudre limiteur de
tension mais destiné à un
environnement à
conditions étendues
Parafoudre limiteur de
tension et de courant
mais destiné à un
environnement à
conditions étendues
– 24 – 61643-21 Amend.2 © CEI:2012
Ajouter les nouvelles références suivantes:
IEC 61643-11:2011, Parafoudres connectés aux systèmes de distribution basse tension -
Prescriptions et essais
Recommandation ITU-T K.44: 2011, Tests d'immunité des équipements de télécommunication
exposés aux surtensions et aux surintensités – Recommandation fondamentale
Supprimer la référence à la Recommandation UIT-T K.65:2011

3 Définitions
Remplacer la définition existante 3.11 par la suivante:
3.11
courant total de décharge I
Total
courant circulant dans la borne de terre (borne commune C) d’un parafoudre multibornes
pendant le test de courant total de décharge
Ajouter les nouvelles définitions suivantes:
3.33
courant nominal de décharge I
n
valeur crête du courant d’onde 8/20 traversant le parafoudre
3.34
courant de foudre assigné I
SM
valeur maximum du courant impulsionnel suivant une forme d’onde définie
3.35
courant d’impulsion de foudre I
imp
valeur crête du courant de décharge du parafoudre en onde 10/350µs

4.2 Température et humidité d'essai
Remplacer le premier alinéa existant par ce qui suit:
Le parafoudre doit être testé à une température de 25 °C ± 10 °C avec une humidité relative
de 25 % à 75 %.
En cas de demande du fabricant ou du client, le parafoudre doit être testé aux températures
extrêmes de la plage de températures choisie pour l'application prévue. La plage de
températures choisie peut être plus étroite que la plage complète selon 4.1 en fonction de
l'application.
4.3 Conditions d’essai des parafoudres
Remplacer le troisième alinéa existant par ce qui suit:

61643-21 Amend.2 © CEI:2012 – 25 –
Quand une base est utilisée pour l’essai, les mesures doivent être réalisées aussi près que
possible des bornes de la base du parafoudre (module de terminaison) prévue pour les
connexions externes. Les enregistreurs de formes d’onde utilisés pour les mesures doivent
avoir des performances minimales conformes à la CEI 61083-1 par rapport à la mesure
spécifique.
NOTE Pour les paramètres d'enregistreurs de forme d’onde, voir Annexe D.
Remplacer le quatrième alinéa existant par ce qui suit:
Les types de connexion des figures 1c, 1e et 1f peuvent avoir un chemin d’écoulement du
courant de décharge commun (pouvant inclure des composants de protection et des
connexions internes), pour l’écoulement du courant total de décharge I . Le fabricant doit
total
préciser le courant maximal d’impulsion pour ce chemin d’écoulement. Cette valeur peut être
inférieure à la somme des courants d’impulsion de chaque ligne.
Effacer le cinquième alinéa de 4.3

5.1.1 Identification et documentation
Changer l'énumération e) j) l) m) par ce qui suit:
e) Tension maximale de service permanent Uc (c.a. et/ou c.c.)
j) Impulsion assignée (conformément au Tableau 3 - catégorie et paramètres
correspondants, exemple C2: 2kV/1kA)
l) Caractéristiques de transmission (a
...