IEC TR 62368-2:2019
(Main)Audio/video, information and communication technology equipment - Part 2: Explanatory information related to IEC 62368-1:2018
Audio/video, information and communication technology equipment - Part 2: Explanatory information related to IEC 62368-1:2018
IEC TR 62368-2:2019 provides explanatory information related to IEC 62368-1. Only those subclauses considered to need further background reference information or explanation of their content to benefit the reader are included. Therefore, not all numbered subclauses are cited. Unless otherwise noted, all references are to clauses, subclauses, annexes, figures or tables located in IEC 62368-1:2018. This third edition updates the second edition of IEC 62368-2 published in 2014 to take into account changes made to IEC 62368-1:2014 as identified in the Foreword of IEC 62368-1:2018. This Technical Report is informative only. In case of a conflict between IEC 62368-1 and IEC TR 62368-2, the requirements in IEC 62368-1 prevail over this Technical Report.
Key words: Audio/Video, Safeguards, Information, Communication
Équipements des technologies de l'audio/vidéo, de l'information et de la communication - Partie 2 : Précisions relatives à l'IEC 62368-1:2018
L'IEC TR 62368-2:2019 fournit des explications au sujet de l'IEC 62368-1. Ne sont inclus que les paragraphes qui nécessitent des informations complémentaires ou des explications pouvant bénéficier au lecteur. Par conséquent, certains numéros de paragraphes ne sont pas cités. Sauf indication contraire, toutes les références à des articles, paragraphes, annexes, figures ou tableaux renvoient à l'IEC 62368-1:2018 Cette troisième édition actualise la deuxième édition de l'IEC 62368-2 publiée en 2014 et intègre les modifications faites dans l'IEC 62368-1:2014 telles qu'indiquées dans l'Avant-propos de l'IEC 62368-1:2018. Le présent Rapport technique est un document informatif. En cas de conflits entre l'IEC 62368-1 et l'IEC TR 62368-2, les exigences de l'IEC 62368-1 prévalent sur le présent Rapport technique.
Mots-clés: Audio/Vidéo, Protection, Information, Communication
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IEC TR 62368-2 ®
Edition 3.0 2019-05
REDLINE VERSION
TECHNICAL
REPORT
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Audio/video, information and communication technology equipment –
Part 2: Explanatory information related to IEC 62368-1:20142018
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC TR 62368-2 ®
Edition 3.0 2019-05
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Audio/video, information and communication technology equipment –
Part 2: Explanatory information related to IEC 62368-1: 20142018
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.01; 35.020 ISBN 978-2-8322-6916-9
– 2 – IEC TR 62368-2:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
0 Principles of this product safety standard . 10
1 Scope . 12
2 Normative references . 13
3 Terms, definitions and abbreviations . 13
4 General requirements . 16
5 Electrically-caused injury . 23
6 Electrically-caused fire . 73
7 Injury caused by hazardous substances. 108
8 Mechanically-caused injury . 112
9 Thermal burn injury. 120
10 Radiation . 129
Annex A Examples of equipment within the scope of this standard . 136
Annex B Normal operating condition tests, abnormal operating condition tests .
and single fault condition tests . 137
Annex C UV Radiation . 140
Annex D Test generators . 140
Annex E Test conditions for equipment containing audio amplifiers . 140
Annex F Equipment markings, instructions, and instructional safeguards . 141
Annex G Components . 142
Annex H Criteria for telephone ringing signals . 150
Annex J Insulated winding wires for use without interleaved insulation . 152
Annex K Safety interlocks . 152
Annex L Disconnect devices . 152
Annex M Equipment containing batteries and their protection circuits . 153
Annex O Measurement of creepage distances and clearances . 162
Annex P Safeguards against conductive objects . 162
Annex Q Circuits intended for interconnection with building wiring . 163
Annex R Limited short-circuit test . 164
Annex S Tests for resistance to heat and fire . 164
Annex T Mechanical strength tests . 166
Annex U Mechanical strength of CRTs and protection against the effects of
implosion . 167
Annex V Determination of accessible parts . 167
Annex X Alternative method for determing clearances for insulation in circuits
connected to an AC mains not exceeding 420 V peak (300 V RMS) . 168
Annex Y Construction requirements for outdoor enclosures . 168
Annex A (informative) Background information related to the use of SPDs . 171
Annex B (informative) Background information related to measurement of discharges
– Determining the R-C discharge time constant for X- and Y-capacitors . 185
Annex C (informative) Background information related to resistance to candle flame
ignition . 196
Bibliography . 197
Figure 1 – Risk reduction as given in ISO/IEC Guide 51. 11
Figure 2 – HBSE Process Chart . 12
Figure 3 – Protective bonding conductor as part of a safeguard . 15
Figure 4 – Safeguards for protecting an ordinary person . 19
Figure 5 – Safeguards for protecting an instructed person . 20
Figure 6 – Safeguards for protecting a skilled person . 20
Figure 7 – Flow chart showing the intent of the glass requirements . 22
Figure 8 – Conventional time/current zones of effects of AC currents (15 Hz to 100 Hz)
on persons for a current path corresponding to left hand to feet (see IEC/TS 60479-
1:2005, Figure 20) . 25
Figure 9 – Conventional time/current zones of effects of DC currents on persons for a
longitudinal upward current path (see IEC/TS 60479-1:2005, Figure 22) . 26
Figure 10 – Illustration that limits depend on both voltage and current . 27
Figure 11 – Illustration of working voltage . 41
Figure 12 – Illustration of transient voltages on paired conductor external circuits . 43
Figure 13 – Illustration of transient voltages on coaxial-cable external circuits . 44
Figure 14 – Basic and reinforced insulation in Table 15 14 of IEC 62368-1:20142018;
ratio reinforced to basic . 46
Figure 15 – Reinforced clearances according to Rule 1, Rule 2, and Table 15 14 . 48
Figure 16 – Example illustrating accessible internal wiring . 56
Figure 17 – Waveform on insulation without surge suppressors and no breakdown . 59
Figure 18 – Waveforms on insulation during breakdown without surge suppressors . 59
Figure 19 – Waveforms on insulation with surge suppressors in operation . 60
Figure 20 – Waveform on short-circuited surge suppressor and insulation . 60
Figure 21 – Example for an ES2 source . 62
Figure 22 – Example for an ES3 source . 62
Figure 23 – Overview of protective conductors . 64
Figure 24 – Example of a typical touch current measuring network . 67
Figure 25 – Touch current from a floating circuit . 69
Figure 26 – Touch current from an earthed circuit . 70
Figure 27 – Summation of touch currents in a PABX . 70
Figure 28 – Possible safeguards against electrically-caused fire . 78
Figure 29 – Fire clause flow chart . 81
Figure 30 – Prevent ignition flow chart . 86
Figure 31 – Control fire spread summary . 88
Figure 32 – Control fire spread PS2 . 89
Figure 33 – Control fire spread PS3 . 90
Figure 34 – Fire cone application to a large component . 99
Figure 35 – Flowchart demonstrating the hierarchy of hazard management . 111
Figure 36 – Model for chemical injury . 112
Figure 37 – Direction of forces to be applied . 117
Figure 38 – Model for a burn injury . 120
– 4 – IEC TR 62368-2:2019 RLV © IEC 2019
Figure 39 – Model for safeguards against thermal burn injury . 122
Figure 40 – Model for absence of a thermal hazard . 123
Figure 41 – Model for presence of a thermal hazard with a physical safeguard in place . 123
Figure 42 – Model for presence of a thermal hazard with behavioural safeguard
in place . 123
Figure 43 – Flowchart for evaluation of Image projectors (beamers) . 131
Figure 44 – Graphical representation of L ,T . 133
Aeq
Figure 45 – Overview of operating modes . 139
Figure 46 – Voltage-current characteristics (Typical data) . 143
Figure 47 – Example of IC current limiter circuit . 148
Figure 48 – Current limit curves . 151
Figure 49 – Example of a dummy battery circuit . 161
Figure 50 – Example of a circuit with two power sources.
...
IEC TR 62368-2 ®
Edition 3.0 2019-05
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
Audio/video, information and communication technology equipment –
Part 2: Explanatory information related to IEC 62368-1:2018
Équipements des technologies de l'audio/vidéo, de l'information
et de la communication –
Partie 2: Précisions relatives à l'IEC 62368-1:2018
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
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IEC TR 62368-2 ®
Edition 3.0 2019-05
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
Audio/video, information and communication technology equipment –
Part 2: Explanatory information related to IEC 62368-1:2018
Équipements des technologies de l'audio/vidéo, de l'information
et de la communication –
Partie 2: Précisions relatives à l'IEC 62368-1:2018
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.01; 35.020 ISBN 978-2-8322-6716-5
– 2 – IEC TR 62368-2:2019 © IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
0 Principles of this product safety standard . 10
1 Scope . 12
2 Normative references . 13
3 Terms, definitions and abbreviations . 13
4 General requirements . 16
5 Electrically-caused injury . 23
6 Electrically-caused fire . 70
7 Injury caused by hazardous substances . 105
8 Mechanically-caused injury . 109
9 Thermal burn injury . 117
10 Radiation . 126
Annex A Examples of equipment within the scope of this standard . 133
Annex B Normal operating condition tests, abnormal operating condition tests and
single fault condition tests . 133
Annex C UV Radiation . 136
Annex D Test generators . 136
Annex E Test conditions for equipment containing audio amplifiers . 137
Annex F Equipment markings, instructions, and instructional safeguards . 137
Annex G Components . 138
Annex H Criteria for telephone ringing signals . 146
Annex J Insulated winding wires for use without interleaved insulation . 148
Annex K Safety interlocks . 148
Annex L Disconnect devices . 148
Annex M Equipment containing batteries and their protection circuits . 149
Annex O Measurement of creepage distances and clearances . 158
Annex P Safeguards against conductive objects . 158
Annex Q Circuits intended for interconnection with building wiring . 159
Annex R Limited short-circuit test . 160
Annex S Tests for resistance to heat and fire . 160
Annex T Mechanical strength tests . 162
Annex U Mechanical strength of CRTs and protection against the effects of
implosion . 163
Annex V Determination of accessible parts . 163
Annex X Alternative method for determing clearances for insulation in circuits
connected to an AC mains not exceeding 420 V peak (300 V RMS) . 163
Annex Y Construction requirements for outdoor enclosures . 164
Annex A (informative) Background information related to the use of SPDs . 167
Annex B (informative) Background information related to measurement of discharges
– Determining the R-C discharge time constant for X- and Y-capacitors . 180
Annex C (informative) Background information related to resistance to candle flame
ignition . 192
Bibliography . 193
Figure 1 – Risk reduction as given in ISO/IEC Guide 51. 11
Figure 2 – HBSE Process Chart . 12
Figure 3 – Protective bonding conductor as part of a safeguard . 15
Figure 4 – Safeguards for protecting an ordinary person . 19
Figure 5 – Safeguards for protecting an instructed person . 19
Figure 6 – Safeguards for protecting a skilled person . 20
Figure 7 – Flow chart showing the intent of the glass requirements . 22
Figure 8 – Conventional time/current zones of effects of AC currents (15 Hz to 100 Hz)
on persons for a current path corresponding to left hand to feet (see IEC/TS 60479-
1:2005, Figure 20) . 25
Figure 9 – Conventional time/current zones of effects of DC currents on persons for a
longitudinal upward current path (see IEC/TS 60479-1:2005, Figure 22) . 26
Figure 10 – Illustration that limits depend on both voltage and current . 27
Figure 11 – Illustration of working voltage . 39
Figure 12 – Illustration of transient voltages on paired conductor external circuits . 41
Figure 13 – Illustration of transient voltages on coaxial-cable external circuits . 42
Figure 14 – Basic and reinforced insulation in Table 14 of IEC 62368-1:2018; ratio
reinforced to basic . 43
Figure 15 – Reinforced clearances according to Rule 1, Rule 2, and Table 14 . 45
Figure 16 – Example illustrating accessible internal wiring . 53
Figure 17 – Waveform on insulation without surge suppressors and no breakdown . 56
Figure 18 – Waveforms on insulation during breakdown without surge suppressors . 57
Figure 19 – Waveforms on insulation with surge suppressors in operation . 57
Figure 20 – Waveform on short-circuited surge suppressor and insulation . 57
Figure 21 – Example for an ES2 source . 59
Figure 22 – Example for an ES3 source . 59
Figure 23 – Overview of protective conductors . 61
Figure 24 – Example of a typical touch current measuring network . 64
Figure 25 – Touch current from a floating circuit . 66
Figure 26 – Touch current from an earthed circuit . 67
Figure 27 – Summation of touch currents in a PABX .
...
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