SIST EN IEC 62368-3:2020

SLOVENSKI STANDARD
SIST EN IEC 62368-3:2020
01-julij-2020
Nadomešča:
SIST EN 60950-21:2004
Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - 3. del: Vidiki
varnosti za prenos enosmerne moči skozi komunikacijske kable ali porte (IEC
62368-3:2017)
Audio/video, information and communication technology equipment - Part 3: Safety
aspects for DC power transfer through communication cables and
ports
Einrichtungen für Audio/Video, Informations- und Kommunikationstechnik - Sicherheit -
Teil 3: Gleichstrom-Leistungsübertragung über Kommunikationskabel der
Informationstechnik (IEC 62368-3:2017)
Équipements des technologies de l'audio/vidéo, de l'information et de la communication -
Partie 3: Aspects liés à la sécurité relatifs au transfert de puissance en courant continu
au moyen de câbles et d'accès de communication (IEC 62368-3:2017)
Ta slovenski standard je istoveten z: EN IEC 62368-3:2020
ICS:
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN IEC 62368-3:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62368-3:2020


EUROPEAN STANDARD EN IEC 62368-3

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2020
ICS 33.160.01; 35.020 Supersedes EN 60950-21:2003 and all of its
amendments and corrigenda (if any)
English Version
Audio/video, information and communication technology
equipment - Part 3: Safety aspects for DC power transfer
through communication cables and ports
(IEC 62368-3:2017)
Équipements des technologies de l'audio/vidéo, de Einrichtungen für Audio/Video, Informations- und
l'information et de la communication - Partie 3: Aspects liés Kommunikationstechnik - Sicherheit - Teil 3: Gleichstrom-
à la sécurité relatifs au transfert de puissance en courant Leistungsübertragung über Kommunikationskabel der
continu au moyen de câbles et d'accès de communication Informationstechnik
(IEC 62368-3:2017) (IEC 62368-3:2017)
This European Standard was approved by CENELEC on 2018-01-11. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62368-3:2020 E

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SIST EN IEC 62368-3:2020
EN IEC 62368-3:2020 (E)
European foreword
The text of document 108/695/FDIS, future edition 1 of IEC 62368-3, prepared by IEC/TC 108 "Safety
of electronic equipment within the field of audio/video, information technology and communication
technology" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 62368-3:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-09-27
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2020-12-20
document have to be withdrawn

This document supersedes EN 60950-21:2003 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association
.
Endorsement notice
The text of the International Standard IEC 62368-3:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62949:2017 NOTE Harmonized as EN 62949:2017 (not modified)


2

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EN IEC 62368-3:2020 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 62368-1 (mod) 2014 Audio/video, information and EN 62368-1 2014
communication technology equipment -
Part 1: Safety requirements
- -  + AC 2015
- -  + A11 2017
- -  EN 62368-1:2014/
AC:2017-03
IEC Guide 104 -  The preparation of safety publications and - -
the use of basic safety publications and
group safety publications
ISO/IEC Guide 51 -  Safety aspects - Guidelines for their - -
inclusion in standards


3

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SIST EN IEC 62368-3:2020



IEC 62368-3

®


Edition 1.0 2017-12




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE






GROUP SAFETY PUBLICATION


PUBLICATION GROUPÉE DE SÉCURITÉ



Audio/video, information and communication technology equipment –

Part 3: Safety aspects for DC power transfer through communication cables and

ports




Équipements des technologies de l’audio/vidéo, de l’information et de la

communication –


Partie 3: Aspects liés à la sécurité relatifs au transfert de puissance en courant

continu au moyen de câbles et d’accès de communication











INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.160.01; 35.020 ISBN 978-2-8322-5131-7



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

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CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
4 General requirements . 9
5 Power transfer using ES1 or ES2 voltages . 9
5.1 General requirements . 9
5.2 Electrical-caused injury, electrical sources and safeguards . 9
5.3 Electrical-caused fire, power sources and safeguards . 9
5.3.1 DC power transfer interconnection to building wiring . 9
5.3.2 DC power transfer interconnection to other equipment . 10
5.4 Safeguards to protect against a single fault condition in the PSE . 10
5.4.1 Requirement for the PSE . 10
5.4.2 Requirement for the PD . 11
6 Power transfer using RFT . 11
6.1 General requirements . 11
6.2 Connection to ICT networks . 11
6.3 Electrically caused injury . 11
6.3.1 Classification and limits of electrical energy sources . 11
6.3.2 Accessibility to electrical energy sources and safeguards . 14
6.3.3 Safeguards . 15
6.3.4 Installation instructions . 16
6.4 Electrically caused fire . 17
6.4.1 Classification of RFT power sources . 17
6.4.2 Fire protection requirements . 17
Annex A (informative) Remote power feeding . 19
A.1 Overview. 19
A.2 Operational considerations . 19
A.3 Safety considerations . 20
A.4 Principle of remote power feeding . 20
A.4.1 RFT-C circuits . 20
A.4.2 RFT-V circuits . 22
A.5 Safety aspects . 22
A.5.1 Steady-state body current . 22
A.5.2 Body resistance . 23
A.5.3 Charged capacitance . 23
Annex B (informative) Rationale for 5.4 . 24
Bibliography . 25

Figure 1 – Maximum current after a single fault. 12
Figure 2 – Maximum voltages permitted after a single fault . 14
Figure 3 – Limits for capacitance values of RFT circuits of the total system . 17
Figure A.1 – Example of a remote power feeding RFT-C system . 21

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Figure A.2 – Example of a remote power feeding RFT-C system with repeater . 21
Figure A.3 – Example of a remote power feeding RFT-V system . 22

Table 1 – RFT-V circuits, power and current limitations . 18

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

AUDIO/VIDEO, INFORMATION AND COMMUNICATION
TECHNOLOGY EQUIPMENT –

Part 3: Safety aspects for DC power transfer
through communication cables and ports

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62368-3 has been prepared by IEC technical committee 108:
Safety of electronic equipment within the field of audio/video, information technology and
communication technology.
The text of this International Standard is based on the following documents:
FDIS Report on voting
108/695/FDIS 108/696/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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IEC 62368-3:2017 © IEC 2017 – 5 –
This International Standard is to be used in conjunction with IEC 62368-1:2014.
It has the status of a group safety publication in accordance with IEC Guide 104.
The subclauses of IEC 62368-1 apply as far as reasonable. Where safety aspects are similar
to those of IEC 62368-1, the relevant clause or subclause of IEC 62368-1 is given for
reference in a note in the relevant subclause. Where a requirement in IEC 62368-3 refers to a
requirement or criterion of IEC 62368-1, a specific reference to IEC 62368-1 is made.
In this standard, the following print types are used:
– requirements proper and normative annexes: in roman type;
– compliance statements and test specifications: in italic type;
– notes and other informative matter: in smaller roman type;
– normative conditions within tables: in smaller roman type;
– terms that are defined in Clause 3 and in IEC 62368-1:2014: in bold type.
The following differing practices of a less permanent nature exist in the countries indicated
below.
– 6.1: other requirements apply regarding power transfer using RFT (US);
– 6.3.3.1: regarding separation from other circuits and parts, see note in 4.1.15 of
IEC 62368-1:2014 (Norway);
– A.1: RFT-V systems and requirements (North America).
A list of all parts in the IEC 62368 series, published under the general title Audio/video,
information and communication technology equipment, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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AUDIO/VIDEO, INFORMATION AND COMMUNICATION
TECHNOLOGY EQUIPMENT –

Part 3: Safety aspects for DC power transfer
through communication cables and ports



1 Scope
This part of IEC 62368 applies to equipment intended to supply and receive operating power
through communication cables or ports. It covers particular requirements for circuits that are
designed to transfer DC power from a power sourcing equipment (PSE) to a powered
device (PD).
The power transfer uses voltages at ES1 or ES2 or in very specific cases voltage levels at
ES3.
NOTE 1 ES1 can generally be assumed to have similar limits as non-hazardous voltage definitions used in other
standards (for example, SELV, PELV).
NOTE 2 ES2 can generally be assumed to have similar limits for single fault conditions as non-hazardous
voltage definitions used in other standards.
NOTE 3 PS2 circuits are generally expected to provide less than 100 W to an undefined load under both normal
operating conditions and single fault conditions.
EXAMPLES
– For power transfer using voltages at ES1: USB, PoE, ISDN S0, etc.
– For power transfer using voltages at ES2: analogue telephone during ringing, ISDN U, etc.
– For power transfer using voltages at ES3: power feeding used by communications service providers and
utilities communication circuits (for example, RFT circuits, such as line powered HDSLx, SHDSLx, VDSLx
and G.fast).
NOTE 4 Any cable provided with a connector defined by an industry standard that permits DC power transfer
between equipment is considered a communication cable even if communication does not take place. For example,
a USB cable can be used just to recharge a portable device battery.
This group safety publication is primarily intended to be used as a product safety standard for
the products mentioned in the scope, but shall also be used by technical committees in the
preparation of standards for products similar to those mentioned in the scope of this standard,
in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
basic safety publications and/or group safety publications in the preparation of its publications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62368-1:2014, Audio/video, information and communication technology equipment –
Part 1: Safety requirements
IEC Guide 104, The preparation of safety publications and the use of basic safety publications
and group safety publications

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lSO/lEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62368-1:2014 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
– IEC Electropedia: available at http://www.electropedia.org/
– ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
power sourcing equipment
PSE
equipment, other than dedicated external power supply units intended to supply specific
equipment within the scope of IEC 62368-1, supplying DC power to other equipment through
communication cables or ports
Note 1 to entry: It should be noted that the IEEE 802.3-2015 standard has a similar but different definition.
Note 2 to entry: This note applies to the French language only.
3.1.2
powered device
PD
equipment supplied DC power by a PSE through communication cables or ports
Note 1 to entry: It should be noted that the IEEE 802.3-2015 standard has a similar but different definition.
Note 2 to entry: Some in line devices may just function as a PSE to inject power into the cable connecting to PD
equipment. IEEE 802.3-2015 identifies such devices as Midspan PSE.
Note 3 to entry: Some PD equipment may also have a PSE output to pass on unused power to other PD
equipment.
Note 4 to entry: This note applies to the French language only.
3.1.3
information and communication technology network
ICT network
metallically terminated transmission medium and its associated equipment and
communication cables
Note 1 to entry: The cable consists of two or more conductors intended for communication and/or power transfer
between the various pieces of equipment. The equipment may be located within the same or separate structures,
buildings or locations, excluding:
– the mains system for supply, transmission and distribution of electrical power, if used as a communication
transmission medium;
– a dedicated HBES/BACS network.
Note 2 to entry: This may include twisted pairs, and may include circuits, that are subjected to transients as
indicated by ID1 in Table 14 of IEC 62368-1:2014 (assumed to be 1,5 kV).
Note 3 to entry: An ICT network may be:
– publicly or privately owned;
– subject to longitudinal (common mode) voltages induced from nearby power lines or electric traction lines.
Note 4 to entry: Examples of ICT networks are:

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– a public switched telephone network;
– a public data network;
– an Integrated Services Digital Network (ISDN);
– a private network with electrical interface characteristics similar to the above.
Note 5 to entry: For information about circuit voltages and signals which may be present, see Annex B of
IEC 62949:2017.
Note 6 to entry: This note applies to the French language only.
3.1.4
RFT circuit
remote feeding telecommunication circuit
remote feeding communication circuit
equipment circuit within the ICT network not connected to an AC mains, intended to supply
or receive DC power at voltages exceeding the limits of ES2, and on which overvoltages may
occur
Note 1 to entry: Communication signalling is not required to be present on an RFT circuit.
Note 2 to entry: This note applies to the French language only.
3.1.5
RFT-C circuit
RFT circuit which is so designed and protected that under normal operating conditions and
single fault conditions, the currents in the circuit do not exceed defined values
Note 1 to entry: The limit values of current under normal operating conditions and single fault conditions are
specified in 6.3.1.1.
3.1.6
RFT-V circuit
RFT circuit which is so designed and protected that under normal operating conditions and
single fault conditions, the voltages are limited and the accessible area of contact is limited
Note 1 to entry: The limit values of voltage under normal operating conditions and single fault conditions are
specified in 6.3.1.2.
3.2 Abbreviated terms
BACS building automation and control system
HBES home and building electronic system
HDSL high bit-rate digital subscriber line
ICT information and communication technology
ISDN integrated services digital network
LPS limited power source
PD powered device
PoE power over ethernet
PSE power sourcing equipment
RFT remote feeding (tele)communication
SHDSL symmetric high bit-rate digital subscriber line
USB universal serial bus
VDSL very-high-bit-rate digital subscriber line

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4 General requirements
For equipment serving as a PD or a PSE using voltages at ES1 or ES2, the requirements of
Clause 5 apply. However, Clause 5 does not apply to equipment used as PSE or PD with
proprietary connectors or where a proprietary protocol is used to enable the power transfer.
NOTE A proprietary connector is a connector not used in an industry standard and which is under the control of
one manufacturer.
For equipment serving as a PD or a PSE using RFT, the requirements of Clause 6 apply.
5 Power transfer using ES1 or ES2 voltages
5.1 General requirements
The maximum rated output voltage of the PSE under normal operating conditions shall not
exceed the rated limits of the intended communication systems power source functional
specifications under conditions of no load, normal load, and maximum rated load.
NOTE 1 For USB 2.0 and 3.1, the limits are 5,25 V. For a USB battery charger, the limit is 6 V. USB power
delivery can be rated up to 20 V max.
NOTE 2 Other ES1 and ES2 DC power transfer systems are under investigation.
Where a PD or PSE have the capability to both provide power and receive power, all the
requirements from 5.1 to 5.4 shall apply for each mode as applicable.
NOTE 3 Equipment can have multiple ports serving different PSE and PD roles simultaneously in any combination.
5.2 Electrical-caused injury, electrical sources and safeguards
The requirements of Clause 5 of IEC 62368-1:2014 apply for a PSE classified as ES1 and
ES2.
5.3 Electrical-caused fire, power sources and safeguards
5.3.1 DC power transfer interconnection to building wiring
To protect the communication cables, including building wiring, and other devices including
the PD, the PSE shall implement power limiting control to reduce the likelihood of ignition and
shall limit the output current to a value that does not cause damage to the wiring system.
To reduce the likelihood of ignition, the PSE circuit that provides power shall comply with the
requirements for a limited power source (LPS) of Clause Q.1 of IEC 62368 1:2014.
NOTE 1 This means that a fire enclosure is not normally required in the power feeding load circuits of the PD.
For interconnection of PSE circuits to other devices for DC power transfer via building wiring,
where it is unknown whether remotely attached devices comply with this document, the PSE
shall limit the output current to a value that does
...