oSIST prEN IEC 61643-21:2024

SLOVENSKI STANDARD
01-september-2024
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 21. del: Naprave,
priključene na telekomunikacijska in signalna omrežja - Zahteve in preskusne
metode
Low voltage surge protective devices - Part 21: Surge protective devices connected to
telecommunications and signalling networks - 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
télécommunications - Prescriptions de fonctionnement et méthodes d\'essais
Ta slovenski standard je istoveten z: prEN IEC 61643-21:2024
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

37A/414/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61643-21 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-07-19 2024-10-11
SUPERSEDES DOCUMENTS:
37A/399/CD, 37A/411/CC
IEC SC 37A : LOW-VOLTAGE SURGE PROTECTIVE DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr David Richmond
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 37
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

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

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.

IEC CDV 61643-21/Ed2  IEC2024 – 2 – 37A/414/CDV

1 CONTENTS
3 FOREWORD . 8
4 INTRODUCTION . 10
5 1 Scope . 11
6 2 Normative references . 11
7 3 Terms, definitions and abbreviated terms . 11
8 3.1 Terms and definitions. 11
9 4 Classification . 14
10 4.1 General . 14
11 4.5 Type of SPD . 14
12 4.8 Mounting method . 14
13 4.13 End of life mode of the SPDA . 14
14 4.14 Short-Circuit protection function for OCM end of life mode . 14
15 4.100 SPD configurations . 14
16 4.101 Overstressed fault mode acc. 3.1.115 . 15
17 4.101.1 Mode 1 . 15
18 4.101.2 Mode 2 . 15
19 4.101.3 Mode 3 . 15
20 4.102 Additional information about transmission and special applications . 15
21 5 Void . 15
22 6 Marking and other product information . 15
23 6.1 General . 15
24 6.2 List of items . 16
25 6.2.100 Information to be provided by the manufacturer . 17
26 6.2.101 Information which shall be provided by the manufacturer for type
27 testing, as applicable . 17
28 6.3 Information about status indicator . 17
29 7 Service conditions . 17
30 8 Requirements . 18
31 8.1 General requirements . 18
32 8.3 Electrical requirements . 18
33 8.3.1 Protection against electric shock . 18
34 8.3.2 Continuous current I . 18
C
35 8.3.3 Protective conductor current I . 18
PE
36 8.3.4 Measured limiting voltage . 18
37 8.3.5 Operating duty . 19
38 8.3.6 Safety performance of overstressed SPDs . 19
39 8.3.7 Insulation resistance . 19
40 8.3.8 Dielectric withstand . 20
41 8.3.9 Behaviour under temporary overvoltages . 20
42 8.3.100 Impulse durability and voltage protection level . 20
43 8.3.101 Impulse reset . 20
44 8.3.102 AC durability, if declared by the manufacturer . 20
45 8.3.103 Blind spot . 21

IEC CDV 61643-21/Ed2  IEC2024 – 3 – 37A/414/CDV

46 8.3.104 Series resistance . 21
47 8.3.105 Current-limiting requirements . 21
48 8.3.106 Transmission requirements . 22
49 8.4 Mechanical requirements . 22
50 8.4.1 General . 22
51 8.4.5 Mechanical strength . 22
52 8.5 Environmental and material requirements . 22
53 8.5.2 Heat resistance . 22
54 8.5.4 Tracking resistance . 23
55 8.5.5 Ageing behaviour under damp heat . 23
56 8.6 Additional requirements for specific SPD designs . 23
57 8.6.1 Two port SPDs and one port SPDs with separate input/output
58 connections . 23
59 8.6.3 SPDs with electrically separated circuits . 23
60 8.6.4 Total discharge current I , if declared by the manufacturer . 23
Total
61 8.6.5 Two port SPDs . 23
62 8.6.6 Short-circuiting SPDs . 23
63 9 Tests . 23
64 9.1 Type testing procedures. 24
65 9.1.1 General . 24
66 9.1.2 Impulse discharge current. 29
67 9.1.3 8/20 Current impulse . 29
68 9.1.4 1,2/50 voltage impulse . 29
69 9.1.5 Combination wave . 29
70 9.1.100 Waveform tolerances of impulse categories C3 and D2 . 29
71 9.3 Electrical tests . 29
72 9.3.1 Protection against direct contact . 30
73 9.3.2 Continuous current I . 30
C
74 9.3.3 Protective conductor current IPE . 30
75 9.3.4 Measured limiting voltage . 30
76 9.3.5 Operating duty test . 30
77 9.3.6 Safety performance of overstressed SPDs . 30
78 9.3.8 Dielectric withstand . 33
79 9.3.9 Behaviour under temporary overvoltages (TOV) . 36
80 9.3.100 Impulse durability and voltage protection level . 36
81 9.3.101 Impulse reset . 39
82 9.3.102 AC durability . 41
83 9.3.103 Blind spot test . 42
84 9.3.104 Series resistance . 43
85 9.3.105 Current-limiting tests . 44
86 9.3.106 Transmission tests . 47
87 9.4 Mechanical tests . 51
88 9.4.3 Tests for external connections for copper conductors . 51
89 9.4.4 Verification of air clearances and creepage distances . 51
90 9.5 Environmental and material tests . 53
91 9.5.2 Heat resistance . 53
92 9.5.4 Tracking resistance . 54

IEC CDV 61643-21/Ed2  IEC2024 – 4 – 37A/414/CDV

93 9.5.5 Life test under damp heat . 54
94 9.6 Additional tests for specific SPD designs . 54
95 9.6.1 Tests for
...