Amendment 2 - Low voltage surge protective devices - Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods

Amendement 2 - Parafoudres basse tension - Partie 21: Parafoudres connectés aux réseaux de signaux et de télécommunications - Prescriptions de fonctionnement et méthodes d'essais

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Publication Date
26-Jul-2012
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Start Date
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IEC 61643-21:2000/AMD2:2012 - Amendment 2 - Low voltage surge protective devices - Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods
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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
IEC 61643-21:2000/A2:2012
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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.
_____________
---------------------- Page: 4 ----------------------
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
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
---------------------- Page: 5 ----------------------
– 4 – 61643-21 Amend.2 © IEC:2012
Table 1 (continued)
Test Requirement – Test Sub- Type of SPD
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
voltage limiting function 6.2.1.6 A A A A A A
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
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
---------------------- Page: 6 ----------------------
61643-21 Amend.2 © IEC:2012 – 5 –
Table 1 (continued)
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 6.2.1.6.

Test not applicable if there is a linear component between its terminals.
Each test series is carried out on three samples.
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
crest value of the current through the SPD having a current waveshape of 8/20
---------------------- Page: 7 ----------------------
– 6 – 61643-21 Amend.2 © IEC:2012
3.34
rated surge current I
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)
---------------------- Page: 8 ----------------------
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

• 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

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

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.
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

shall be tested with DC If U of this SPD has only an AC value this device shall be tested with

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.
---------------------- Page: 9 ----------------------
– 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.

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 .

---------------------- Page: 10 ----------------------
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
voltage current number of tested
applications
A1 10 A, Not applicable X1 – C
≥ 1 kV
(NA) X2 – C
Rate of rise from
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

An open-circuit voltage different from 1 kV may be used as long as the SPD under test operates.

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

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:
---------------------- Page: 11 ----------------------
– 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:
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:
---------------------- Page: 12 ----------------------
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:
---------------------- Page: 13 ----------------------
– 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

current flowing through the SPD shall be adjusted to the value of the specified and calculated surge current i .”

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

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

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

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.
---------------------- Page: 14 ----------------------
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

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 t
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