prEN IEC 63315:2026

• Status: Not Published
• Publication Date: 23-Feb-2028
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• Technical Committee: CLC/TC 108X - Safety of electronic equipment within the fields of Audio/Video, Information Technology and Communication Technology
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 02-Jan-2026
• Completion Date: 02-Jan-2026
• Ref Project: oSIST prEN IEC 63315:2025 - Audio/video, information and communication technology equipment – Safety – DC power transfer between ICT equipment ports using ICT wiring and cables at voltages not exceeding 60 V DC

prEN IEC 63315:2026 is a CLC draft standard for the safety of audio/video, information and communication technology equipment that transfers DC power between ICT equipment ports using ICT wiring and cables at voltages not exceeding 60 V DC. It sets safeguards, test methods and compliance checks for power sourcing equipment (PSE), powered devices (PD), cables and protocol behavior so connected equipment can be assessed independently. The document is intended to be used with IEC 62368-1 and with the relevant ICT power delivery specification for the interface being used.

What does prEN IEC 63315:2026 specify?

prEN IEC 63315:2026 applies to equipment intended to supply or receive charging or operating power from ICT interfaces that use ICT wiring or cables. It covers DC power transfer through a standardized ICT interface from a PSE to a PD where the rated interface voltage does not exceed 60 V DC and the power exceeds PS1.

The scope includes common interfaces such as PoE, USB and HDMI when they support power transfer. It also covers non-static power source behavior and static power source behavior, as well as manufacturer-specific ICT power delivery specifications when they use an interchangeable ICT interface.

The document excludes custom connectors that are not interchangeable with common ICT interface connectors, wireless power transfer, power transfer controlled only by wireless communication over a physical cable, and RFT circuits and other technologies within IEC 63316.

Annex	What it covers
Annex A	Examples of common interfaces that are in or out of scope
Annex B	Example behaviors of non-static power sources and qualified loads
Annex C	Rationale for the fire-related requirements in 6.3 and 6.4
Annex D	Rationale and examples of communication errors and protocol safeguards
Annex E	Communication errors and USB Power Delivery protocol safeguards

What are the key requirements of prEN IEC 63315:2026?

prEN IEC 63315:2026 adds safety rules on top of IEC 62368-1 for interfaces that both communicate and deliver power. The main aim is to keep PSE output, PD input, cables and protocol behavior within defined limits in normal operation, abnormal operation and single-fault conditions.

Fire and injury protection start from IEC 62368-1

Clause 5 links accessible-circuit protection to IEC 62368-1:2023, using its requirements for ES1 sources or equivalent safeguards from another relevant product safety standard. In practice, equipment makers still need the base safety case from IEC 62368-1 and then add the interface-specific safeguards from this document.

PSE and PD must match the intended ICT power delivery specification

Clause 6.1 requires the relevant ICT interface and ICT power delivery specification to be considered together. PSE and PD ports are assessed by power mode, and multi-role equipment is checked in each applicable mode. For non-static PSEs, a qualified load is needed to create the worst-case conditions for testing.

Normal operation has separate rules for PSE and PD

Clause 6.2 requires the PSE output circuit to be pin-compatible with the industry standard ICT power delivery specification. Static PSEs are limited to the rated voltage and current of the relevant specification under open circuit and maximum rated load conditions. PD input circuits must also be pin-compatible and able to receive the rated voltage and current.

Cables have their own safety conditions

Clause 6.3.2.4 requires detachable local ICT interface cables to meet the connector-material and wiring requirements taken from IEC 62368-1. Cables longer than 3 m need an instructional safeguard saying they are not intended for installation as building wiring, or an equivalent marked instruction. That matters because a long detachable cable can otherwise be mistaken for building wiring.

Abnormal and single-fault limits are tightly controlled

Clauses 6.3.3 and 6.4.1 limit PSE output current and voltage under abnormal operating conditions and single-fault conditions. If the ICT power delivery specification does not give a fault value, the document provides derived limits. The measurements are taken after 5 s, so designs must survive the initial transient and still stay within limits.

The PD must withstand a PSE overvoltage fault

Clause 6.4.2 requires the PD to withstand the simulated PSE fault voltage under test conditions based on the maximum current and voltage limits from 6.3.3 and 6.4.1. For PDs with a secondary lithium battery, the test criterion is especially strict: the unit shall not result in fire or explosion during or after the test.

Protocol safeguards are mandatory when power is negotiated by data packets

Clause 6.5.1 requires basic safeguards for power negotiation. At initial connection, the PSE must stay in the default power mode until a contract is established. If the requested power is not allowed, the output must not change to an unsafe state and may revert to default or disconnect. On disconnection or overload, it must return to the default mode.

For data packet negotiated power systems rated above 100 W, Clause 6.5.2 adds safeguards against corruption, insertion, masquerade, repetition, wrong sequence, loss, delay and wrong addressing. The protocol needs message ID, sequence number, protected content, feedback, keep-alive or watchdog behavior, and recognized identifiers for both devices. Clause 6.5.3 then requires software and firmware updates to preserve those safeguards.

What terms does prEN IEC 63315:2026 define?

• ICT power delivery specification - the formal set of characteristics needed for power compatibility between the PSE, PD, cable and connector interface.
• PSE (power sourcing equipment) - equipment that supplies DC power from its ICT interface to a PD.
• PD (powered device) - equipment that receives DC power at its ICT interface from a PSE.
• local ICT interface - an ICT interface where the PSE and PD are in close proximity and the cable is not used for building wiring.
• remote ICT interface - an ICT interface where the PSE and PD are not in close proximity and the cabling is commonly used in building wiring or an ICT network.
• non-static power source - a PSE that can deliver its maximum rated voltage, current or power only into a qualified load.
• qualified load - a PD verified by the PSE, often through a negotiated contract.
• data packet negotiated power system - a local or remote ICT interface that uses data packet handshaking to agree the DC power output.

Who uses prEN IEC 63315:2026?

prEN IEC 63315:2026 is used by product designers, safety engineers, test laboratories, certification bodies and quality teams working on audio/video and ICT equipment. It is particularly relevant for USB, PoE, HDMI and similar interfaces where the same port can carry both communication and power.

Manufacturers, component suppliers and buyers use it to check interface compatibility, cable marking, power negotiation behavior and fault performance. It is also relevant where a product has both PSE and PD roles, or where protocol-controlled power transfer must be validated mode by mode.

What changed in prEN IEC 63315:2026 from the previous edition?

This first edition cancels and replaces IEC 62368-3:2017, Clause 5. The foreword states that it is a technical revision.

The significant changes listed are:

• unique requirements for local ICT interfaces and remote ICT interfaces
• added requirements for non-static power sources, including supplementary safeguards for PS3
• added protocol safeguards for data packet negotiated power systems
• added cable requirements

Which standards are used with prEN IEC 63315:2026?

IEC 62368-1:2023 is the normative reference in Clause 2. It provides the base safety framework, including the PS1, PS2 and PS3 concepts, the ES1 injury framework and the component safety rules used throughout this document.

Other standards and specifications are used as companions in clauses and annexes:

• IEC 62680-1-1, IEC 62680-1-2 and IEC 62680-1-3 - USB battery charging, USB Power Delivery, and USB Type-C cable and connector rules used in the USB examples
• IEC 60730-1:2022 - used as an alternative reference for Class B communication safeguards and for software or firmware update examples
• IEC 61784-3:2021 - source for protocol safeguard concepts against communication errors
• IEC 63002:2025 - additional USB power rules referenced in the USB examples
• IEC 63316 - related safety standard for power transfer at 60 V DC and above, named in the exclusions
• ITU-T K.50:2018 and IEC 60050 - source definitions for key terms used in Clause 3

What does the prEN IEC 63315:2026 document contain?

The document combines requirements, compliance checks, rationale and worked interface examples. Clause 6 includes tables that map normal, abnormal and single-fault conditions to the relevant requirements, plus current and voltage limit tables and a figure showing the sustained fault-voltage limit.

Annex D explains why the fire limits and protocol safeguards are structured the way they are, including a table that relates safeguard types to communication errors. Annex E applies those ideas to USB Power Delivery with a block diagram, a flowchart and example power-mode calculations, which helps engineers test multi-port and daisy-chained USB systems in realistic configurations.

SLOVENSKI STANDARD
01-december-2025
Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - Varnost -
Prenos enosmerne moči med porti opreme IKT z uporabo ožičenja in kablov IKT
pri napetostih, ki ne presegajo 60 V enosmerno
Audio/video, information and communication technology equipment – Safety – DC power
transfer between ICT equipment ports using ICT wiring and cables at voltages not
exceeding 60 V DC
Ta slovenski standard je istoveten z: prEN IEC 63315:2025
ICS:
33.160.01 Avdio, video in avdiovizualni Audio, video and audiovisual
sistemi na splošno systems in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

108/851/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63315 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-10-10 2026-01-02
SUPERSEDES DOCUMENTS:
108/840/NP, 108/846/RVN
IEC TC 108 : SAFETY OF ELECTRONIC EQUIPMENT WITHIN THE FIELD OF AUDIO/VIDEO, INFORMATION TECHNOLOGY AND COMMUNICATION
TECHNOLOGY
SECRETARIAT: SECRETARY:
United States of America Ms Valara Davis
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 23, TC 34, TC 61, TC 62, TC 72, TC 100 TC 108 Horizontal Group Safety
ASPECTS CONCERNED:
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).
nex A
TITLE:
Audio/video, information and communication technology equipment – Safety – DC power transfer between ICT
equipment ports using ICT wiring and cables at voltages not exceeding 60 V DC

PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
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108/851/CDV
Link to Committee Draft for Vote (CDV) online document:
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i
IEC CDV 63315 © IEC 2025
CONTENTS
FOREWORD . 3
Introduction. 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Abbreviated terms . 10
5 Electrically-caused injury, electrical sources and safeguards . 10
6 Electrically-caused fire, power sources and safeguards . 10
6.1 General requirements . 10
6.2 Normal operating conditions. 11
6.2.1 PSE . 11
6.2.2 PD . 12
6.3 Circuit safeguards . 12
6.3.1 DC power transfer through a remote ICT interface . 12
6.3.2 DC power transfer through a local ICT interface . 12
6.3.3 PSE output current in abnormal condition and single fault condition
(during interconnection to other equipment) . 13
6.3.4 Voltage limits for PSE under abnormal operating conditions from
external loads . 14
6.4 Supplementary safeguards during single fault conditions in the PSE . 14
6.4.1 Voltage limits for PSE under fault conditions . 14
6.4.2 Supplementary Safeguard for the PD during a PSE overvoltage single
fault condition . 16
6.5 Protocol safeguards . 16
6.5.1 General . 16
6.5.2 Data packet negotiated power systems safeguard requirements for PSE
rated output above 100 W . 17
6.5.3 Protocol updates . 18
Annex A (informative) Examples of common interfaces which are in or out of the
scope of this document . 19
Annex B (informative) Example behaviours of non-static power sources and qualified
loads . 20
B.1 Non-static power sources . 20
B.2 Qualified loads . 20
Annex C (informative) Rationale for 6.3 and 6.4 . 22
Annex D (informative) Rationale and examples of communication errors and protocol
safeguards . 24
D.1 Rationale for 6.5 . 24
D.1.1 General . 24
D.1.2 Software Architecture and software faults . 24
D.1.3 Soft errors . 24
D.1.4 Protocol elements and supplemental information . 24
D.1.5 Cable marker . 26
D.1.6 Source reference . 27
D.2 Typical relationships between errors and protocol safeguards . 27
D.3 Communication errors . 28
D.3.1 General . 28
IEC CDV 63315 © IEC 2025
D.3.2 Corruption . 28
D.3.3 Unintended repetition . 28
D.3.4 Incorrect sequence . 28
D.3.5 Loss . 29
D.3.6 Unacceptable delay . 29
D.3.7 Insertion . 29
D.3.8 Masquerade . 29
D.3.9 Addressing . 29
D.4 Protocol safeguards . 29
D.4.1 General . 29
D.4.2 Sequence number . 29
D.4.3 Time stamp . 29
D.4.4 Time expectation . 30
D.4.5 Connection authentication . 30
D.4.6 Feedback message . 30
D.4.7 Data integrity assurance . 30
D.4.8 Redundancy with cross checking . 30
D.4.9 Different data integrity assurance systems . 30
Annex E (informative) Communication errors and USB Power Delivery protocol
safeguards . 32
E.1 General . 32
E.2 USB PD example walk-through . 33
Bibliography . 37

Figure 1 – PSE maximum sustained output fault voltage limit. 15
Figure E.1 – Block diagram of daisy chained USB devices . 33
Figure E.2 – Flowchart of USB power modes . 35

Table 1 – . 10
Table 2 – Overview of electrically-caused fire clauses for PSE’s (3.2) and PD’s (3.3) . 11
Table 3 – Current limits in abnormal conditions and single-fault conditions for PSE
(3.2) output circuits when no fault current value exists . 14
Table 4 – Voltage limits in single-fault conditions for PSE output circuits when no fault
voltage value exists . 15
Table D.1 – Overview of the effectiveness of the various measures on the possible
errors . 27
Table E.1 – Communication error types and USB PD protocol safeguards . 32
Table E.2 – Examples of different USB PD power modes and how limits are derived . 34

IEC CDV 63315 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Audio/video, information and communication technology equipment –
Safety – DC power transfer between ICT equipment ports using ICT wiring
and cables at voltages not exceeding 60 V DC

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
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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) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC CDV 63315 © IEC 2025
IEC had not notice of (a) patent(s), which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which
may be obtained from the patent database available at https://patents.iec.ch and
www.iso.org/patents . IEC shall not be held responsible for identifying any or all such patent
rights.
[30] IEC 63315 has been prepared by IEC technical committee 108: Safety of electronic
equipment within the field of audio/video, information technology and communication
technology. It is an International Standard.
This first edition cancels and replaces IEC 62368-3:2017 [18], Clause 5. This edition constitutes
a technical revision.
This edition includes the following significant technical changes with respect to IEC 62368-
3:2017 [18], Clause 5:
a) establishes unique requirements for local ICT interfaces (3.9) and remote ICT interfaces
(3.11);
b) addition of requirements for non-staticpower sources (3.12), including supplementary
safeguards for PS3;
c) addition of protocol (3.10) safeguards for data packet negotiated power systems (3.7);
d) addition of cable requirements.
The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
In this document, 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 inIEC 62368-1:2023: in bold type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC CDV 63315 © IEC 2025
Introduction
This document prescribes safeguards, test methods and compliance requirements intended to
reduce the risk of fire associated with standardized, common ICT interfaces that are used for
power delivery at voltages not exceeding 60 V DC.
This document does not replace the requirements of other applicable safety standards, but may
be considered for incorporation as a normative reference in other end-product safety standards
by the relevant technical committees.
This document is intended to be used with IEC 62368-1:2023 or other electrotechnical product
standards that includes safety requirements (e.g. lighting, household appliances, novelty items,
etc.) to provide additional safeguards when products with common ICT interfaces are
interconnected.
IEC 62368-1:2023 defines power source (PS) levels with safeguards to reduce risk of fire.
IEC 63315 defines interface compatibility safeguards to address disparity between the power
expected by the powered device (3.3) and the available power from power sourcing equipment
(3.2) by establishing expected values which can be tested respectively and independently.
IEC CDV 63315 © IEC 2025
1 Scope
This document applies to any equipment intended to supply or receive charging or operating
power from Information and Communication Technology (ICT) interfaces using ICT wiring or
cables. It covers particular requirements for circuits that are designed to transfer DC power
through an ICT interface from a power sourcing equipment (3.2) to a powered device (3.3) for
equipment that uses rated interfaces at voltage not exceeding 60 V DC and power exceeding
PS1.
Examples of equipment interfaces that are considered to be within the scope of this document:
– PoE;
– US
– HDMI.
NOTE 1 Any wiring or cable that permits DC power transfer between ICT equipment is considered a communication
cable or ICT cable even if communication does not take place on the conductors. For example, a USB cable can be
used just to recharge a portable device battery.
PSE (3.2) and PD (3.3) using other ICT power delivery specification (3.1) that differ from the
industry standard ICT power delivery specification (3.1) defined for use with the industry
standard connector are in the scope of this document.
Non-static power source (3.12) and static power source (3.13) are covered in this document.
Unless otherwise stated, this document does not cover:
– power sources with output connectors not associated with a local ICT interface (3.9) or
remote ICT interface (3.11);
– power sources with custom connectors that are not interchangeable with common ICT
interface connectors;
– non-static power source (3.12) which can deliver power to multiple PDs (3.3) through a
single port or cable simultaneously;
– power sources with only wireless power transfer;
– power sources which utilize a wireless communication protocol (3.10) to control the power
transfer through a physical cable connection;
– remote feeding telecommunication (RFT) circuits and other specific communication
technologies within the scope of [30] IEC 63316.
NOTE 2 A custom connector is a connector that is not used with an industry communication standard.
NOTE 3 Bluetooth® is an example of a wireless communication protocol (3.10) to control the power transfer through
a physical cable connection.
Refer to Annex A for examples of common interfaces which are in or out of scope of this
document.
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 62368-1:2023, Audio/video, information and communication technology equipment - Part
1: Safety requirements
IEC CDV 63315 © IEC 2025
3 Terms and definitions
For the purposes of this document, the following terms and definitions / terms and definitions
given in IEC 62368-1:2023, as well as 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
ICT power delivery specification
formal statement of those characteristics of a particular ICT interface necessary to ensure
power delivery compatability between the power sourcing equipment (3.2), powered device
(3.3), cable, and connector interface
Note 1 to entry: An ICT power delivery specification (3.1) will normally indicate the protocol (3.10) and procedures
which determine if the (given) requirements are fulfilled, including voltage, current, and power ranges.

Note 2 to entry: An ICT power delivery specification (3.1) can include one or more documents, including design,
interoperability, and test specifications.
Note 3 to entry: An industry standard ICT power delivery specification (3.1) is the specification for the industry
standard connector. Other ICT power delivery specification (3.1) can exist, including a manufacturer's specification,
which differ from the industry standard ICT power delivery specification (3.1). In the context of this document, relevant
ICT power delivery specification (3.1) can include industry standard ICT power delivery specification (3.1) and other
ICT power delivery specification (3.1) which utilize the ICT interface.
[SOURCE: IEC 60050 (all parts) [29], IEC 60050-716:1995, 716-01-011, modified — Rewording
of the definition and of Note 1 to entry, addition of two new notes to entry.]
3.2
power sourcing equipment
PSE
equipment supplying DC power from its ICT interface to a PD (3.3) through ICT wiring or cable

Note 1 to entry: It should be noted that ISO/IEC/IEEE 8802-3:2021 [6] has a different definition.
[SOURCE: ITU-T K.50:2018 [28], 3.2.11, modified ─ Rewording of the definition and addition
of a new Note 1 to entry.]]
3.3
powered device
PD
equipment supplied with DC power to its ICT interface from a PSE (3.2)
Note 1 to entry: It should be noted that ISO/IEC/IEEE 8802-3:2021 [6] has a different definition.
[SOURCE: ITU-T K.50:2018 [28], modified ─ Term changed from “powered equipment” to
“powered device”, rewording of the definition and addition of a new Note 1 to entry.]
3.4
information and communication technology network
ICT network
transmission medium, including its associated equipment, ICT wiring and communication cables
Note 1 to entry: An ICT cable consists of two or more conductors intended for communication between the various
parts of ICT equipment and can include power transfer. The equipment can be located within the same or separate
structures, buildings or locations, excluding:
IEC CDV 63315 © IEC 2025
– the mains system for supply, transmission and distribution of electrical power, if used as a communication
transmission medium;
– a dedicated HBES/BACS network. The requirement for interconnection with external circuits in an HBES/BACS
network is given in IEC 63044-3 [26].
Note 2 to entry: This can include some twisted pair circuits, and can include circuits, that are subjected to transients
as indicated by Table 13 of IEC 62368-1:2023.
Note 3 to entry: An ICT network (3.4) can be:
– publicly or privately owned;
– subject to longitudinal (common mode) as well as transverse (differential) voltages and currents induced by
lightning, nearby power lines or electric traction lines.
Note 4 to entry: ICT wiring and cables include common audio and video (AV) connectors used with ICT equipment
(e.g. HDMI) but does not include AV connectors providing power for acoustics (e.g. Audio amplifiers connectors for
speakers).
3.5
building wiring
ICT or AV wires or cables that are intended to be installed wholly within a structure

EXAMPLE Wires or cables installed in walls, under floors, in plenums, risers, etc. in a building or structure, that
are used to connect ICT or AV equipment in different locations within the building and that is not mains. It also
includes devices associated with the interconnection of the equipment, LAN cables, telecommunication cables, data
cables, patch panels, connectors, etc.
Note 1 to entry: Under certain circumstances building wiring (3.5) can run outside the building for connection to
equipment (for example, a video camera outside of the building).
Note 2 to entry: building wiring (3.5) also includes devices associated with the interconnection of the equipment.
The cables can be conductive or non-conductive, such as optical fibre cable.
3.6
cyclic redundancy check
CRC
cyclic code used to protect messages from the influence of data corruption
Note 1 to entry: A CRC (3.6) (i.e. check value) is generated using message data and a generating polynomial.
Note 2 to entry: A CRC (3.6) can be provided with various lengths in bits, referred to as a n-bit CRC (3.6) where
the n is the number bits of the check value.
Note 3 to entry: A CRC (3.6) is appended to the protocol (3.10) message which is used to validate data integrity on
the receiving end.
[SOURCE: IEC 60050 (all parts) [29], IEC 60050-821:2017, 821‑11‑10, modified ─ New Notes
to entry.]
3.7
data packet negotiated power system
type of remote ICT interface (3.11) or local ICT interface (3.9) that requires data packet
handshaking negotiation between a PD (3.3) and a PSE (3.2) to establish an agreed upon DC
power output from the PSE (3.2)
Note 1 to entry: USB Power Delivery is an example of a data packet negotiated power system (3.7), which can also
be considered a type characterizing a non-static power source (3.12).
3.8
Hamming distance
number of digit positions in which the corresponding digits of two n-bit bytes of the same length
are different
EXAMPLE An example of two data sets having a Hamming distance (3.8) of 3 between these datasets is “111000”
and “000000”.
IEC CDV 63315 © IEC 2025
Note 1 to entry: The Hamming distance (3.8) is relevant to different control messages used in the protocol (3.10).
[SOURCE: IEC 60050 (all parts) [29], IEC 60050-721:1991, 721‑08‑25, modified ─ New Notes
to entry.]
3.9
local ICT interface
ICT interface supplying or receiving DC power to or from local equipment via communication
cable, where the PSE (3.2) and PD (3.3) are located in close proximity and the communication
cable is not used for building wiring (3.5)
Note 1 to entry: Example of local ICT interface (3.9) is USB Power Delivery, typically less than 3 meters of cabling.
3.10
protocol
set of rules for data transmission between two devices
EXAMPLE Examples of elements within a protocol (3.10) include:
– data packets transferred between devices (messages),
– the meaning of data packets (semantics),
– the format of data packets (syntax) and
– the logic time sequence of data exchange.
Note 1 to entry: A protocol (3.10) can define the conditions for establishing a connection to a transmission medium
(e.g. physical layer), the rules governing access to the transmission medium, the procedures for error protection, the
functional and procedural means of data exchange, the transport mechanisms, the communication control, the
representation of data and the exchange of application data.
[SOURCE: IEC 60050 (all parts) [29], IEC 60050-351:2013, 351‑56‑14, modified ─ Replacement
of “in a system interlinking several participants” with “between two devices”.]
3.11
remote ICT interface
ICT interface supplying or receiving DC power to or from remote equipment via communication
cabling, where the PSE (3.2) and PD (3.3) are not located in close proximity to each other and
the communication cable is commonly used in building wiring (3.5) or connected through an
ICT network (3.4)
EXAMPLE An example of remote ICT Interface (3.11) is PoE.
3.12
non-static power source
PSE (3.2) that can deliver the maximum rated voltage, current, or power only into a qualified
load (3.14)
Note 1 to entry: To enable various power modes, one or more qualified loads (3.14) with behaviours outlined in
Clause B.2 can be used.
3.13
static power source
PSE (3.2) that is capable of delivering one or more of the maximum rated voltage, current, or
power into a resistive load
3.14
qualified load
PD (3.3) that has been verified by the PSE (3.2)
Note 1 to entry: Verification can include where the PSE (3.2) has established a contract with the PD (3.3). A contract
is a negotiated agreement between the PD (3.3) and PSE (3.2) that determines the power direction and maintains
the power level within known limits.
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Note 2 to entry: Clause B.2 provides examples with common behaviours and characteristics associated with
qualified loads (3.14).
4 Abbreviated terms
Table 1 –
AV audio/video
BACS building automation and control system
CRC (3.6) cyclic redundancy check
FIFO first in, first out
HBES home and building electronic system
HDMI high-definition multimedia interface
IC integrated circuit
ICT information and communication technology
ID identifier
LAN local area network
LPS limited power source
PD (3.3) powered device
PoE power over ethernet
PSE (3.2) power sourcing equipment
USB universal serial bus
USB BC USB battery charging
USB PD USB power delivery
USB PD EPR USB PD extended power range
USB PD SPR USB PD standard power range
5 Electrically-caused injury, electrical sources and safeguards
The requirements of Clause 5 of IEC 62368-1:2023 I apply for sources classified as ES1 as
defined in IEC 62368-1:2023. Safeguards shall be provided to reduce the risk of electrical-
caused injury to persons associated with accessible circuits:
- according to the requirements of Clause 5 of IEC 62368-1:2023 for sources classified as ES1
as defined in IEC 62368-1:2023; or
- according to equivalent safeguards in accordance with a relevant IEC product safety standard
referencing this document.
NOTE See 5.3.2.1 of IEC 62368-1:2023 for accessibility consideration of equipment intended for outdoor locations.
6 Electrically-caused fire, power sources and safeguards
6.1 General requirements
The ICT interface and the relevant ICT power delivery specifications (3.1) shall be considered
when applying the requirements of this document.
For electrically-caused fire, PSE’s (3.2) and PD’s (3.3) shall comply with the relevant clauses
as indicated in Table 2. Unless otherwise specified, the voltage and current limits for single
fault conditions are applicable to abnormal operating conditions.
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Table 2 – Overview of electrically-caused fire clauses for PSE’s (3.2) and PD’s (3.3)
Conditions PSE’s (3.2) PD’s (3.3)
Voltage Current
Voltage Current
Normal operating conditions 6.2.1 6.2.1 6.2.2 6.2.2
Abnormal operating conditions 6.3.4 6.3.3 6.4.2 6.4.2
a
Single-fault conditions 6.4.1 6.3.3
Not applicable
a
Except as a result of abnormal operating condition of 6.4.2.
Output care considered to comply with the requirements of 6.3, 6.4, and 6.5 without further
evaluation and testing.
If the PSE (3.2) is a non-static power source (3.12), (for example, a data packet negotiated
power system (3.7)), the PSE (3.2) shall be connected to a qualified load (3.14) (for example,
a terminating device) that turns on the PSE (3.2) and generates the worst case test conditions
under, normal operating conditions, abnormal operating conditions,and single fault
conditions.
NOTE 2 For more information on non-static power sources (3.12) and qualified loads (3.14) refer to Annex B.
Where a PSE (3.2) circuit supports more than one output power mode, each power mode shall
be separately assessed.
Where a device has the capability to change power source and power sink roles, the
requirements for PSE (3.2) and the PD (3.3) shall apply to the ICT interface power circuits for
each applicable power mode.
Where a device has multiple interfaces which support PSE (3.2) and the PD (3.3) roles, they
shall be checked to ensure PSE (3.2) outputs function independently of the PD (3.3) input.
NOTE 3 Equipment can have multiple interfaces serving different PSE (3.2) and PD (3.3) roles simultaneously in
any combination. To validate a device’s worst case conditions, PSE (3.2) and PD (3.3) ports can be tested together
to ensure output voltages are correctly negotiated.
NOTE 4 See Annex E for more information on USB PD.
Where a PD (3.3) or PSE (3.2) supports a data packet negotiated power system (3.7),
requirements for protocol (3.10) safeguards in 6.5 shall apply.
Single fault conditions do not apply to:
– isolating components (for example, optocouplers and transformers) complying with the
relevant component requirements in Annex G of IEC 62368-1:2023 for reinforced
insulation; or
– IC current limiters complying with Annex G.9 of IEC 62368-1:2023.
NOTE 5 For the purpose of this document, when establishing a single fault condition, a PSE (3.2) circuit is one
that directly controls the function of the PSE (3.2) output interface only and is not intended to apply to the source of
the power (for example, in all circuits extending back to an isolating transformer).
NOTE 6 See Annex C for the rationale.
6.2 Normal operating conditions
6.2.1 PSE
The output circuit of the PSE (3.2) shall be pin compatible with the industry standard ICT power
delivery specification (3.1).
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For static power sources (3.13), the output voltage and current shall not exceed the rated
limits of the relevant ICT power delivery specifications (3.1), under the following load
conditions:
– open circuit; and
– load representing the maximum rated operating power.
If a static power source (3.13) utilizes an ICT interface which can support non-static power
modes, the static power source (3.13) shall not output a rated voltage and a rated current that
exceeds the default power mode of the industry standard power delivery specification (3.1).
For example, a static power source (3.13) with a USB Type-C connector would be limited to
a rated voltage and current of 5 V, 3 A, since providing rated power above 15W also requires
USB PD which is a non-static power mode.
Non-static power sources (3.12) shall meet basic protocol (3.10) safeguards in 6.5.1 for
normal operating conditions.
Compliance is checked inspection of the output circuit and if necessary, by test.
6.2.2 PD
The input circuit of the PD (3.3) shall be:
– pin compatible with the industry standard ICT power delivery specification (3.1); and
– capable of receiving the rated voltage and current in accordance with the relevant ICT
power delivery specifications (3.1).
Compliance is checked inspection of the input circuit and if necessary, by test.
6.3 Circuit safeguards
6.3.1 DC power transfer through a remote ICT interface
PSE (3.2) circuits that provide power through a remote ICT interface (3.11) to building wiring
(3.5) shall comply with the requirements of 6.5.2 of IEC 62368-1:2023.
Compliance is checked by test, inspection, and the requirements of Annex Q of IEC 62368-
1:2023.
NOTE These safeguards typically apply to equipment that are not located in close proximity to each other, such
as those associated with PoE and similar ICT cables.
EXAMPLE of such PD (3.3) equipment are: PoE powered security camera, network switch, or hub.
6.3.2 DC power transfer through a local ICT interface
6.3.2.1 Static PSEs
Static power source (3.13) providing power to a local ICT interface (3.9) shall comply with
6.6 of IEC 62368-1:2023.
Compliance is checked by inspection or measurement.
6.3.2.2 Non-static PSEs
Non-static power source (3.12) shall comply with all of the following:
– connection to an unknown PD (3.3) shall limit output power to PS2 in accordance with 6.6
of IEC 62368-1:2023; and
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– validation of protocol (3.10) basic safeguards at initial connection and at disconnection in
accordance with 6.5.1.
NOTE 1 When the PD (3.3) is known (i.e. after power mode is established between the PSE (3.2) and PD (3.3)),
the PSE (3.2) can exceed PS2 limits, as defined in IEC 62368-1:2023, when compliant with 6.3.3, 6.4.1, and 6.5.
NOTE 2 A known PD (3.3) is one that is recognized by the PSE (3.2).
Compliance is checked in accordance with 6.6 of IEC 62368-1:2023and 6.5.1 of this document.
6.3.2.3 PDs
PDs (3.3) intended for connection to PS2 shall comply with the safeguards for PS2 as defined
in IEC 62368-1:2023 .
PDs (3.3) intended for connection to PS3 shall comply with the safeguards for PS3 as defined
in IEC 62368-1:2023 .
EXAMPLE for such PDs (3.3) equipment are: cell phones, tablets, laptops.
NOTE Not all cell phones, tablets, laptops, or similar devices are intended for connection to PS3.
Compliance is checked in accordance with 6.3 and 6.4 of IEC 62368-1:2023.
6.3.2.4 Cables
Detachable local ICT interface (3.9) cables shall comply will all of the following:
– Connector materials shall comply with;
• 6.4.5 in IEC 62368-1:2023 for PS2 circuits;
• 6.4.6 in IEC 62368-1:2023 for PS3 circuits; and
– Wiring shall comply with 6.5.1 in IEC 62368-1:2023.
Detachable local ICT interface (3.9) cables longer than 3 meters shall be:
– marked with an instructional safeguard, “CAUTION: Cable not intended for installation
as building wiring (3.5)” or similar text; or
– as an alternative, be marked with an instructional safeguard according to F.5 of IEC
62368-1:2023 with element 1b where the complete instructional safeguard shall be in the
text of a document accompanying the equipment.
NOTE Detachable local ICT interface (3.9) cables fall under scope of IEC 62368-1:2023 as accessories intended
to be used with equipment within the scope of IEC 62368-1:2023 1. Cable requirements for material selection and
validation are already addressed in IEC 62368-1:2023 IEC 62368-1:2023 by applying relevant tests in Annex D (e.g.
D.2.6, D.3.5, D.4.6).
Durability, legibility and performance of the marking shall be in accordance with F.3.10 of IEC
62368-1:2023 .
Compliance is checked by inspection, as applicable in accordance with 6.4.5, 6.4.6 and 6.5.1
of IEC 62368-1:2023 and when applicable, the language requirement of F.1, legibility of F.3.9,
and test of F.3.10 of IEC 62368-1:2023 .
6.3.3 PSE output current in abnormal condition and single fault condition (during
interconnection to other equipment)
To reduce the likelihood of electrically-caused fire under abnormal operating conditions and
single fault conditions in the PSE (3.2), the output current from the PSE (3.2) circuit shall not
exceed the specified fault current rating in the relevant ICT power delivery specifications
(3.1) for the referenced standardized interface.
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Where a PSE (3.2) supports more than one power mode, the output current of the PSE (3.2)
shall not exceed the maximum fault current for each power mode.
Where there is no specified maximum fault current in the relevant ICT power delivery
specifications (3.1) for the standardized interface the maximum sustained current shall not
exceed the current limits in Table 3.
Table 3 – Current limits in abnormal conditions and single-fault conditions for PSE (3.2)
output circuits when no fault current value exists
Abnormal condition output Single fault condition output
a a
Power mode Rated current
current limit current limit
Less than or
150 % of maximum rated current
Static power sources
equal to 2 A
(3.13)
Greater than 2 A 3 A or 130 % of maximum rated current whichever is greater
Less than or
150 % of a power mode’s maximum rated current
equal to 2 A
Non-static power
sources (3.12)
a
3 A or 130 % of a power mode’s maximum rated current
Greater than 2 A
whichever is greater
a
For non-static power sources (3.12), where a PSE (3.2) circuit supports more than one output power mode,
each power mode shall be separately assessed in accordance with the limits in Table 3.
If the operation of a protective device or circuitry is used to limit the current, current that
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