FprEN IEC 63316:2025

Audio/video, information and communication technology equipment - Safety - Power transfer between communications equipment ports using communication wires and cables cabling at non-mains voltage above 60 V DC and ES2/ES3 AC voltage

Equipements des technologies de l'audio/vidéo, de l'information et de la communication - Sécurité - Transfert de puissance entre les accès d'équipements de communication au moyen de câblages de communication ≥ 60 V en courant continu et en courant alternatif

Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - Varnost - Prenos moči med vrati komunikacijske opreme z uporabo komunikacijskih kablov pri ≥ 60 Vd.c. in AC

General Information

• Status: Not Published
• Publication Date: 03-May-2026
• Technical Committee: CLC/TC 108X - Safety of electronic equipment within the fields of Audio/Video, Information Technology and Communication Technology
• Drafting Committee: IEC/TC 108 - IEC_TC_108
• Current Stage: 5020 - Vote circulated - Formal Approval
• Start Date: 19-Dec-2025
• Completion Date: 19-Dec-2025
• Ref Project: oSIST prEN IEC 63316:2023 - Audio/Video, Information and Communication Technology Equipment - Safety - Power transfer between Communications equipment ports using Communications cabling at ≥ 60 Vd.c. and AC

Overview

FprEN IEC 63316:2025 (CLC/CENELEC adoption of IEC 63316) defines safety requirements for power transfer between communications equipment ports using communications wiring and cabling at voltages ≥ 60 V DC and at ES2/ES3 AC voltage. The document prescribes safeguards, compliance requirements and test methods intended to reduce the risks of fire and electrically-caused injury when power is supplied over communications cabling.

This standard applies to ports and circuits designed to transfer AC or DC power from a Power Sourcing Equipment (PSE) to a Powered Device (PD). Examples include repeaters, amplifiers, Optical Network Units (ONUs), remote DSLAMs, telecommunications cabinets and midspan passive equipment.

Key Topics

• Field of application: Equipment ports intended to supply and receive operating power via communications cables; communications cabling is considered such even if no data signalling is present.
• Voltage classification: Focus on circuits at ≥ 60 V DC (classified as ES2) and, in controlled cases, ES3 circuits. The standard distinguishes between DC powering and AC/DC powering topologies used by service providers and utilities.
• Hazard controls: Requirements addressing electrically-caused injury and electrically-caused fire, including limits, accessibility, and safeguards for power sources and cabling interconnections.
• RFT network powering: Requirements and guidance for RFT-V and RFT-C remote feeding topologies used in telecommunications and cable TV networks.
• Annexes: Informative Annex A on remote power feeding (operational and safety considerations) and Normative Annex B covering flammability tests for enclosure materials.

Applications

This standard is directly relevant to manufacturers, integrators and service providers that design, deploy or maintain equipment and cabling that carry remote power at non-mains voltages. Typical use cases include:

• Powering outdoor or remote telecommunications equipment (line/span powering, repeaters, remote DSLAMs).
• Service-provider coaxial distribution where AC/DC powering above ES1 is used for amplifiers and repeaters.
• Midspan devices and passive injectors that interface PSE and PD over structured cabling.

Practical benefits of complying with FprEN IEC 63316:2025:

• Reduced fire and shock risk through defined safeguards and test criteria.
• Clear guidance for classification of circuits (ES2/ES3) and allowable topologies.
• Better alignment between equipment design and network deployment practices (PSE/PD roles, remote feeding scenarios).

Related Standards

• IEC 62368-1:2018 - referenced for ES2/ES3 definitions and related safety classifications.
• IEC 62368-3 - Clause 6 is intended to be replaced by IEC 63316 on publication.

For implementation, consult the normative references listed in the standard, review Annex A for deployment/topology examples, and use Annex B for enclosure flammability testing. Because the document was prepared for parallel IEC–CENELEC consideration, national committees should confirm the final published edition and any national deviations before applying the requirements.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2023
Oprema za avdio/video, informacijsko in komunikacijsko tehnologijo - Varnost -
Prenos moči med vrati komunikacijske opreme z uporabo komunikacijskih kablov
pri ≥ 60 Vd.c. in AC
Audio/Video, Information and Communication Technology Equipment - Safety - Power
transfer between Communications equipment ports using Communications cabling at ≥
60 Vd.c. and AC
Equipements des technologies de l'audio/vidéo, de l'information et de la communication -
Sécurité - Transfert de puissance entre les accès d'équipements de communication au
moyen de câblages de communication ≥ 60 V en courant continu et en courant alternatif
Ta slovenski standard je istoveten z: prEN IEC 63316:2023
ICS:
31.020 Elektronske komponente na Electronic components in
splošno general
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.

108/799/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63316 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-01-27 2023-04-21
SUPERSEDES DOCUMENTS:
108/773/CD, 108/792/CC
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: PROPOSED HORIZONTAL STANDARD:

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,
• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are
reminded that the enquiry stage is the final stage for submitting "in some countries" clauses. See
AC/22/2007.
TITLE:
Audio/Video, Information and Communication Technology Equipment – Safety – Power transfer
between Communications equipment ports using Communications cabling at ≥ 60 Vd.c. and AC

PROPOSED STABILITY DATE: 2027
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 63316 ED1 © IEC 2022 – 2 – 108/799/CDV

NOTE FROM TC/SC OFFICERS:
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1 CONTENTS
3 FOREWORD . 5
4 INTRODUCTION . 7
5 1 Scope . 8
6 2 Normative references . 9
7 3 Terms and definitions . 10
8 3.1 Terms and definitions . 10
9 3.2 Abbreviated terms . 13
10 4 General requirements . 13
11 5 Communications power transfer using ≥ 60 V DC but ≤ 120 V DC, classified as
12 external ES2 circuit . 13
13 5.1 General Requirements . 13
14 5.2 Electrical-caused injury, electrical sources and safeguards . 14
15 5.3 Electrical-caused fire, power sources and safeguards . 14
16 5.3.1 DC power transfer interconnection to building wiring (3.1.1) . 14
17 5.3.2 DC power transfer interconnection to other equipment . 15
18 6 RFT-V and -C Network Powering (ES2 or ES3) . 15
19 6.1 General requirements . 15
20 6.2 General . 15
21 6.3 Connection to ICT networks operating at RFT . 16
22 6.4 Electrically caused injury . 17
23 6.4.1 Classification and limits of electrical energy sources . 17
24 6.4.2 Accessibility to electrical energy sources and safeguards . 24
25 6.5 Electrically caused fire . 26
26 6.5.1 Fire Protection requirements for RFT power sources . 26
27 7 AC/DC Power transfer of Hazardous Voltage Coax power circuits used by Cable TV
28 utility service providers . 26
29 7.1 General requirements . 26
30 7.2 Electrically caused injury . 27
31 7.2.1 Classification and limits of electrical energy sources . 27
32 7.2.2 Accessibility. 27
33 7.2.3 Safeguards . 27
34 Annex A (informative) Remote power feeding . 28
35 A.1 Overview . 28
36 A.2 Operational considerations . 29
37 A.3 Safety considerations . 29
38 A.3.1 Work practices . 30
39 A.4 Principle of remote power feeding . 30
40 A.4.1 RFT-C circuits . 30
41 A.4.2 RFT-V circuits (3.1.7) . 31
42 A.5 Safety aspects . 32
43 A.5.1 Steady-state body current . 32
44 A.5.2 Body resistance . 33
45 A.5.3 Charged capacitance . 33
46 Annex B (normative) Flammability test for fire enclosure materials of equipment . 35
47 Bibliography . 36
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49 Figure 1 –Field of application. 15
50 Figure 2 – Maximum current after a single fault. 18
51 Figure 3 – RFT-C circuit capacitance limits . 19
52 Figure 4 – Charge and body resistance versus touch voltage . 20
53 Figure 5 – Basic charge measuring circuit . 20
54 Figure 6 – Characterization circuit . 22
55 Figure 7 – Maximum voltages permitted after a single fault . 24
56 Figure 8 – ES3 CATV Network Example . 26
57 Figure A.1 – Field of application of this recommendation . 28
58 Figure A.2 – Example of a remote power feeding RFT-C system . 31
59 Figure A.3 – Example of a remote power feeding RFT-V system with a repeater . 31
60 Figure A.4 – Example of a remote power feeding system . 31
62 Table 1 . 13
63 Table A.1 . 33
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66 INTERNATIONAL ELECTROTECHNICAL COMMISSION
67 ____________
69 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY
70 EQUIPMENT – SAFETY – POWER TRANSFER BETWEEN
71 COMMUNICATIONS EQUIPMENT PORTS USING COMMUNICATIONS
72 CABLING AT ≥ 60 V D.C. AND AC –
74 FOREWORD
75 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
76 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
77 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
78 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
79 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
80 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
81 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
82 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
83 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
84 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
85 consensus of opinion on the relevant subjects since each technical committee has representation from all
86 interested IEC National Committees.
87 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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89 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
90 misinterpretation by any end user.
91 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
92 transparently to the maximum extent possible in their national and regional publications. Any divergence between
93 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
94 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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96 services carried out by independent certification bodies.
97 6) All users should ensure that they have the latest edition of this publication.
98 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
99 members of its technical committees and IEC National Committees for any personal injury, property damage or
100 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
101 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
102 Publications.
103 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
104 indispensable for the correct application of this publication.
105 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
106 rights. IEC shall not be held responsible for identifying any or all such patent rights.
107 IEC 63316 was prepared by IEC Technical Committee 108, Safety of electronic equipment within
108 the field of audio/video, information technology and communication technology. This standard
109 is intended to replace Clause 6 of IEC 62368-3 upon publication.
110 The text of this International Standard is based on the following documents:
Draft Report on voting
108/XX/FDIS 108/XX/RVD
112 Full information on the voting for its approval can be found in the report on voting indicated in
113 the above table.
114 The language used for the development of this International Standard is English.
115 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
116 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

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117 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
118 described in greater detail at www.iec.ch/publications.
119 The committee has decided that the contents of this document will remain unchanged until the
120 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
121 specific document. At this date, the document will be
122 • reconfirmed,
123 • withdrawn,
124 • replaced by a revised edition, or
125 • amended.
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127 INTRODUCTION
128 This standard prescribes safeguards, test methods and compliance requirements intended to reduce
129 the risk of fire associated with voltage and current at voltages greater than 60 V DC and AC.
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131 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY
132 EQUIPMENT – SAFETY – POWER TRANSFER BETWEEN
133 COMMUNICATIONS EQUIPMENT PORTS USING COMMUNICATIONS
134 CABLING AT ≥ 60 V D.C. AND AC
138 1 Scope
139 This standard applies to equipment ports intended to supply and receive operating power from
140 communications equipment ports using communication wires and cables. It covers particular
141 requirements for circuits that are designed to transfer AC or DC power from a power sourcing
142 equipment (PSE) to a powered device (PD), including repeaters, amplifiers, Optical Network
143 Units, Remote DSLAMS, service provider terminating equipment, remote telecommunications
144 cabinets and equipment, and midspan passive equipment connected to the PSE and PD.
145 The power transfer of equipment ports covered by this standard uses non-mains AC voltages or
146 DC voltages
147 ≥ 60 V DC classified as ES2 as defined in IEC 62368-1:2018 or, in some very controlled cases,
148 classified as ES3 as defined in IEC 62368-1:2018 .
149 EXAMPLES
150 - DC power transfer using voltages ≥ 60 V DC but ≤ 120 V DC, classified as ES2;
151 - Some telecommunications networks where the voltage was formerly called TNV-3 (see IEC 62368-1:2018, Table
152 W.3), typically used for line/span/express powering outside North America, Long Range Reverse Power Feeding,
153 HDSLx line powering ISDN, Line Powering Primary Rate E1.
154 - Some North American telecommunications networks between the utility service providers´ PSE and service
155 providers side of the PD at the PNI.
156 - For DC power transfer using voltages ≥ 120 V DC at ES3: RFT circuits and the associated telecommunications
157 network equipment and cabling used by communications service providers and communications utilities (for
158 example, line powered E1/T1, HDSLx, SHDSLx, xDSL, repeaters, and telecommunications line powering
159 up/down converters), Optical Network Units, remote DSLAMS, etc. These RFT circuits are used between the
160 utility service providers PSE and service providers side of the PD at the PNI. The customer facing ports of this
161 equipment are ≤ 60 V DC that are covered by IEC 62368-1:2018, see Annex A for deployment topologies.
162 - For AC/DC remote powering voltage above ES1 over coaxial cable in circuits used by cable television utility
163 service providers for repeaters, amplifiers, Optical Network Units. The customer facing ports of this equipment
164 are ≤ 60 V DC that are covered by IEC 62368-1:2018.
165 NOTE 1 Any communications cable that permits power transfer between communications equipment is considered a
166 communication cable even if communication does not take place. For example, a line-powering
167 upconverter/downconverter used to power remote telecommunications equipment, may just provide limited
168 communications RFT power and not necessarily any superimposed data or signalling.
169 This standard does not cover equipment ports within the scope of IEC 63315, which covers
170 equipment intended to supply and/or receive charging and/or operating power from ICT ports
171 such as PoE, USB, HDMI, audio/visual, etc. This standard does not cover ringing signals that
172 are in the scope of IEC 62949:2017.
173 This standard does not cover traditional telecommunications technologies which operate at ≤ 60
174 V DC (circuits classified as ES1 and Table ID1 in IEC 62368-1:2018) with or without ringing
175 signals (classified as ES2 and external port ID1 in IEC 62368-1:2018) as those are adequately
176 covered in IEC 62368-1:2018. Examples include Analogue Telephony, ISDN, T1, E1, VDSL,
177 SHDSL, DDS, etc.
178 NOTE 2 Communications over mains and high-voltage power transmission and distribution lines are beyond the scope
179 of this standard.
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180 2 Normative references
181 The following documents are referred to in the text in such a way that some or all of their content
182 constitutes requirements of this document. For dated references, only the edition cited applies.
183 For undated references, the latest edition of the referenced document (including any
184 amendments) applies.
185 IEC 60479-1:2018: Effects of current on human beings and livestock - Part 1: General aspects
186 IEC TS 60479-1:2005/AMD1:2016: Amendment 1 - Effects of current on human beings and
187 livestock - Part 1: General aspects
188 IEC TS 60479-1:2005/COR2: Corrigendum 2 - Effects of current on human beings and livestock
189 - Part 1: General aspects
190 IEC 60479-2: Effects of current on human beings and livestock - Part 2: Special aspects
191 IEC 60664-1:2020: Insulation coordination for equipment within low-voltage supply systems -
192 Part 1: Principles, requirements and tests
193 IEC 60695-11-5:2016: Fire hazard testing - Part 11-5: Test flames - Needle-flame test method
194 - Apparatus, confirmatory test arrangement and guidance
195 IEC 60728-11: Cable networks for television signals, sound signals and interactive services -
196 Part 11: Safety
197 IEC 60749-11: Semiconductor devices - Mechanical and climatic test methods - Part 11: Rapid
198 change of temperature - Two-fluid-bath method
199 IEC 62368-1:2018: Audio/video, information and communication technology equipment - Part
200 1: Safety requirements
201 IEC 62368-1:2018: Audio/video, information and communication technology equipment - Part
202 1: Safety requirements
203 IEC 62368-3: Audio/video, information and communication technology equipment - Part 3:
204 Safety aspects for DC power transfer through communication cables and ports
205 IEC 62949:2017: Particular safety requirements for equipment to be connected to information
206 and communication technology networks
207 IEC 62949:2017: Particular safety requirements for equipment to be connected to information
208 and communication technology networks
209 IEC 63315: Audio/Video, Information and Communication Technology Equipment – Safety –
210 DC power transfer between ICT equipment ports using ICT cabling at ≤ 60 Vd.c.
211 ISO/IEC/IEEE 8802-3:2021: Telecommunications and exchange between information
212 technology systems - Requirements for local and metropolitan area networks - Part 3: Standard
213 for Ethernet
214 ITU-T K.50: Safe limits for operating voltages and currents of telecommunication systems
215 powered over the network
216 ITU-T K.50:2018: Safe limits for operating voltages and currents of telecommunication systems
217 powered over the network
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218 ITU-T K.64: Safe working practices for outside equipment installed in particular environments
219 ATIS 0600337: Requirements for Maximum Voltage, Current, and Power Levels Used in
220 Communications Transport Circuits
221 DIN VDE 0800-3: Part 3: Safety of installations with remote power feeding
222 IEEE 802.3: IEEE Standard for Ethernet
223 NFPA 70: National Electrical Code
224 Telcordia GR-1089-CORE: Electromagnetic Compatibility and Electrical Safety
225 UL 2391: UL LLC Outline of Investigation for Equipment with Remote Feeding
226 Telecommunication Circuits Intended for Backwards Compatibility in Legacy
227 Telecommunication Equipment
228 3 Terms and definitions
229 3.1 Terms and definitions
230 For the purposes of this document, the terms and definitions given in IEC 62368-1:2018 and
231 the following apply. Terms and definitions from IEC 62368-1:2018 are indicated in bold.
232 ISO and IEC maintain terminology databases for use in standardization at the following
233 addresses:
234 • IEC Electropedia: available at https://www.electropedia.org/
235 • ISO Online browsing platform: available at https://www.iso.org/obp
236 3.1.1
237 building wiring
238 ICT and AV wires or cables that are intended to be installed wholly within a structure
239 EXAMPLE 1 Wire or cables installed in walls, under floors, in plenums, risers, etc. in a building or structure, that are
240 used to connect ICT and AV equipment in different locations within the building and that is not mains. It also includes
241 devices associated with the interconnection of the equipment. The cables may be conductive or non-conductive, such
242 as Fiber Optic cable and connectorization.
243 Note 1 to entry: Under certain circumstances, building wiring (3.1.1) may run outside the building for connection to
244 equipment (for example, a video camera outside of the building).
245 Note 2 to entry: Within this standard building wiring (3.1.1) excludes dedicated controlled wires and cables for
246 connecting known equipment on each end at the time of installation.
247 3.1.2
248 power sourcing equipment
249 PSE
250 equipment, other than dedicated external power supply unit intended to supply specific
251 equipment, supplying AC or DC power from a communications port to other communications
252 equipment through communications wiring or cables
253 Note 1 to entry: It should be noted that ISO/IEC/IEEE 8802-3:2021 has a similar but different definition, however PoE
254 is not covered by this document.
255 3.1.3
256 powered device
257 PD
258 equipment supplied with AC or DC power by a PSE (3.1.2) into a communications port from
259 communications wiring or cables

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260 Note 1 to entry: It should be noted that ISO/IEC/IEEE 8802-3:2021 has a similar but different definition, however PoE
261 is not covered by this standard
262 Note 2 to entry: Some in-line devices may just function as a PSE (3.1.2) to inject power into the cable connecting
263 to PD (3.1.3) equipment.ISO/IEC/IEEE 8802-3:2021 identifies such devices as Midspan PSE (3.1.2), however PoE is
264 not covered by this document.
265 Note 3 to entry: Some PD (3.1.3) equipment may also have a PSE (3.1.2) output to pass on unused power to other
266 PD (3.1.3) equipment, such as repeaters and in-line amplifiers.
267 3.1.4
268 information and communication technology network
269 ICT network
270 metallically terminated transmission medium and its associated equipment and ICT wiring and
271 communication cables
272 Note 1 to entry: The cable or wiring consists of two or more conductors intended for communication and/or power
273 transfer between the various pieces of communications related equipment. The equipment may be located within the
274 same or separate structures, buildings or locations, excluding: the mains system for supply, transmission and
275 distribution of electrical power, if used as a communication transmission medium; a dedicated HBES/BACS network.
276 End customer terminal equipment and associated wiring and cabling that is operating at ES1 DC voltages, as defined
277 in IEC 62368-1:2018.
278 Note 2 to entry: This may include twisted pairs, and may include circuits, that are subjected to transients as indicated
279 by Table 13 of IEC 62368-1:2018 (assumed to be 1,5 kV).
280 Note 3 to entry: An ICT network may be: - publicly or privately owned; - subject to longitudinal (common mode) as well
281 as transverse (differential) voltages and currents induced from nearby power lines or electric traction lines.
282 Note 4 to entry: Examples of ICT networks addressed within this standard are:
283 ﹘ a telecommunication service provider or utility’s RFT T1/E1, HDSLx, or span/line-powering network that is
284 metallically isolated from the end customers terminal equipment (see Annex A);
285 ﹘a RFT public data network located in the service providers utility space;
286 ﹘a Long Range reverse powering network operating above 60 V DC;
287 ﹘a private RFT network with electrical interface characteristics similar to the above;
288 ﹘a cable television network located in the service providers utility space;
289 Note 5 to entry: For information about circuit voltages and signals, which may be present, see Annex B of
290 IEC 62949:2017. For RFT, see ITU-T K.50. For high voltage coax, see IEC 60728-11.
291 3.1.5
292 remote feeding telecommunication circuit
293 RFT circuit
294 equipment circuit, without a direct mains connection, or a limited current circuit or an ES1 PS2
295 and some ES2 PS2 circuits, intended to supply or receive DC power, at voltages, currents and
296 powers that do not exceed defined values under specified operational conditions when
297 connected to paired-conductor communications network on which overvoltages are possible
298 Note 1 to entry: A telecommunications signal is not required to be present on an RFT circuit (3.1.5), but the power
299 delivered must be used to provide a telecommunication service.
300 Note 2 to entry: Specified conditions include normal operating conditions and single fault conditions and may include
301 abnormal operating conditions and safeguard failure conditions.
302 Note 3 to entry: In the context of this standard, RFT circuits (3.1.5) can be regarded as ES3 and some ES2 voltages
303 which are intended to become external circuits as defined in Table 13 of IEC 62368-1:2018. RFT Circuits (3.1.5) are
304 defined and based on ITU-T K.50.
305 3.1.6
306 RFT‑C circuit
307 RFT circuit (3.1.5) which is so designed and safeguarded that under normal operating
308 conditions and single fault conditions, the currents in the circuit do not exceed defined values
309 Note 1 to entry: ITU-T K.50 is the basis for these limits.

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310 Note 2 to entry: The limit values of current under normal operating conditions and single fault conditions are specified
311 in 6.4.1.1.
312 Note 3 to entry: RFT-C is used outside of North America, unless it also meets RFT-V limits (see Annex A).
313 3.1.7
314 RFT‑V circuit
315 RFT circuit (3.1.5) which is so designed and safeguarded that under normal operating
316 conditions and single fault conditions, the voltages and currents are limited, and the
317 accessible area of contact is limited
318 Note 1 to entry: ITU-T K.50 is the basis for these limits.
319 Note 2 to entry: The limit values of voltage under normal operating conditions and single fault conditions are specified
320 in 6.4.1.2.
321 Note 3 to entry: RFT-V is used only in North America as it does not have safe limits from conductor to conductor.
322 Most limits are conductor to earth (see Annex A).
323 3.1.8
324 public network interface
325 PNI
326 point of demarcation between public and private network
327 Note 1 to entry: In many cases, the public network interface is the point of connection between the network provider's
328 facilities and the customer premises cabling.
329 3.1.9
330 residual differential current device
331 RCD
332 mechanical switching device or association of devices designed to make, carry and break
333 currents under normal service conditions and to cause the opening of the contacts when the
334 residual current attains a given value under specified conditions
335 Note 1 to entry: This term is also known as ground-fault circuit interrupter or GFCI.
336 Note 2 to entry: A RCD (3.1.9) can be a combination of various separate elements designed to detect and evaluate
337 the residual current and to make and break current.
338 Note 3 to entry: In the following countries an RCD (3.1.9) may be either electrical, electronic, mechanical or a
339 combination thereof: US, Canada, Japan, United Kingdom.
340 [IEV ref 442-05-02, modified to add the notes]

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341 3.2 Abbreviated terms
342 Table 1
AV Audio/Video
BACS building automation and control system
GFCI ground-fault circuit interrupter
HBES home and building electronic system
HDSL high bit-rate digital subscriber line
ICT information and communication technology
LPS limited power source
PoE power over ethernet
RFT remote feeding telecommunication
SHDSL symmetric high bit-rate digital subscriber line
TNV telecommunication network voltage
USB universal serial bus
VDSL very-high-bit-rate digital subscriber line
344 4 General requirements
345 The subclauses of IEC 62368-1:2018 apply as far as reasonable. However, IEC 63316 takes
346 precedence when there is a conflict. Where safety aspects are similar to those of IEC 62368-
347 1:2018, the relevant clause or subclause of IEC 62368-1:2018 is given for reference in a note
348 in the relevant subclause. Where a requirement in IEC 63316 refers to a requirement or criterion
349 of IEC 62368-1:2018, a specific reference to IEC 62368-1:2018 is made.
350 5 Communications power transfer using ≥ 60 V DC but ≤ 120 V DC, classified as
351 external ES2 circuit
352 5.1 General Requirements
353 This situation was formerly known as TNV-2 and TNV-3 and is used as an alternative to RFT-C
354 when RFT-C cannot provide enough power to remote equipment. This type of powering is
355 permitted on traditional telecommunications circuits. The maximum rated output voltage of the
356 PSE (3.1.2) under normal operating conditions shall not exceed the rated limits of the intended
357 communication systems power source functional specifications under conditions of no load,
358 normal load, and maximum rated load.
359 Generally, the requirements of IEC 62368-1:2018 shall be followed, however the 60 V DC limit of
360 Annex Q.1 is replaced with 120 V DC.
361 Where a PD (3.1.3) or PSE (3.1.2) have the capability to change power source and power sink
362 roles, all the requirements for both the PD (3.1.3) and PSE (3.1.2) shall apply to the power
363 feeding circuit in each mode as applicable. The requirements in Clause 5 of this standard
364 summarize some of the more important IEC 62368-1:2018 criteria.

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PSE (3.1.2) PD (3.1.3)
365 NOTE Equipment can have multiple ports serving different and roles simultaneously in any
366 combination.
367 5.2 Electrical-caused injury, electrical sources and safeguards
368 The requirements of Clause 5 of IEC 62368-1:2018 apply as applicable.
369 External circuits that could reasonably be expected to be accessible by an ordinary person
370 either within the ICT network (3.1.4), or at the far end of the circuit (for example,
371 plugs/jacks/terminal blocks), shall have the external circuit conductors assumed to be
372 accessible to an ordinary person (regardless of accessibility at the equipment), and shall be
373 limited to ES1 per Table 4 of IEC 62368-1:2018. However, telephone ringing signals, as defined
374 in Annex H of IEC 62368-1:2018, may also be accessible to an ordinary person at these types
375 of locations.
376 5.3 Electrical-caused fire, power sources and safeguards
377 5.3.1 DC power transfer interconnection to building wiring (3.1.1)
378 To protect the communication cables, including building wiring (3.1.1), and other devices
379 including the
380 PD (3.1.3), the PSE (3.1.2) shall implement power limiting control to reduce the likelihood of
381 ignition and shall limit the output current to a value that does not cause damage to the wiring
382 system.
383 To reduce the likelihood of ignition, the PSE (3.1.2) circuit that provides power shall comply
384 with the requirements for a limited power source (LPS) of Clause Q.1 of IEC 62368-1:2018,
385 except that the voltage can be up to 120 V DC or PS2 under:
386 – normal operating conditions; and
387 – abnormal operating conditions of overload or short-circuit on the output; and
388 – single fault conditions.
389 Compliance is checked in accordance with 6.2 or Clause Q.1 of IEC 62368-1:2018.
390 NOTE 1 This means that a fire enclosure is normally not required in the power feeding load circuits of the PD (3.1.3)
391 or the PSE (3.1.2).
392 For interconnection of PSE (3.1.2) circuits to other devices for DC power transfer via building
393 wiring (3.1.1), where it is unknown whether remotely attached devices comply with this document,
394 the PSE (3.1.2) shall limit the output current to a value that does not cause damage to the ICT
395 network (3.1.4)due to overheating, under any conditions of external load up to and including
396 short circuits. The maximum continuous current from the equipment shall not exceed a current
397 limit that is suitable for the minimum wire gauge specified in the equipment installation
398 instructions.
399 The current limit shall be 1,3 A per conductor if such wiring is not specified and the network wiring
400 is not known to be sufficient to carry a higher current.
401 NOTE 2 The overcurrent protective device may be a discrete device such as a fuse, or a circuit that performs that
402 function.
403 NOTE 3 The minimum wire diameter normally used in telecommunication wiring is 0,4 mm, for which the maximum
404 continuous current for a multipair cable is 1,3 A. This building wiring (3.1.1) is not usually controlled by the equipment
405 installation instructions, since the building wiring (3.1.1) is often installed independent of the equipment installation.
406 NOTE 4 Further current limitation may be necessary for equipment intended for connection to networks that are
407 subject to overvoltages, due to operating parameters for protective devices.
408 For a PD (3.1.3) that receives multiple power input circuits from one or more PSE (3.1.2), the
409 PD (3.1.3) shall also implement power limiting (other than voltage is extended to up to 120 V DC)
410 in accordance with PS2 or Annex Q of IEC 62368-1:2018 to control additive power from

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411 returning to another PSE (3.1.2) under normal operating conditions, abnormal operating
412 conditions and single fault conditions.
413 The requirement for single fault condition does not apply to an IC current limiter in compliance
414 with Clause G.9 of IEC 62368-1:2018.
415 Compliance is checked with 6.2 or Clause Q.1 of IEC 62368-1:2018.
416 NOTE 5 These safeguards typically apply to equipment that are not located in close proximity to each other and are
417 connected via building wires.
418 5.3.2 DC power transfer interconnection to other equipment
419 For interconnection of DC power transfer PSE (3.1.2) circuits to other equipment, via either direct
420 plug-in connectors or other means, the requirements of 5.3.1 apply.
421 6 RFT-V and -C Network Powering (ES2 or ES3)
422 6.1 General requirements
423 RFT networks are defined in ITU-T K.50 and the requirements in Clause 6 are derived from that
424 recommendation and are to be used in conjunction with applicable portions of IEC 62368-1:2018.
425 Figure 1 (from ITU-T K.50:2018) depicts the architecture used for RFT.
427 a) In the trunk network
429 b) In the access network
430 Figure 1 –Field of application
431 6.2 General
432 ITU-T K.50 defines two methods for safe powering of telecommunication systems over the
433 network. They are both based on IEC 60479-1:2018. The first method, called RFT-V, which
434 starts at 60 V DC, limits the touch voltage (and above 80 V DC limits the current), so that the
435 insulation or the resistance of the body limits the current conducted by service personnel to

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436 tolerable levels. The second method, called RFT-C, limits the current of the remote power
437 feeding circuit, so that higher voltages can be allowed.
438 Both methods have been used and defined for many years by various operators. RFT-V is used
439 in North America and is based on the US and Canadian Electrical codes and Electrical safety
440 codes, in conjunction with Telcordia GR-1089-CORE, UL 2391, ATIS 0600337, IEC 62368-
441 1:2018, and NFPA 70. RFT-C is used outside USA and Canada and is based on DIN VDE 0800-
442 3 test.
443 PSE (3.1.2) and PD (3.1.3) hardware designed for RFT-V limits shall only be connected to PSE
444 (3.1.2) and PD (3.1.3) hardware intended for RFT-V, unless the equipment meets both the RFT-
445 V and RFT-C requirements.
446 PSE (3.1.2) and PD (3.1.3) hardware designed for RFT-C limits shall only be connected to PSE
447 (3.1.2) and
448 PD (3.1.3) hardware intended for RFT-C, unless the equipment meets both RFT-C and RFT-V
449 requirements.
450 RFT-C and RFT-V are typically > 120 V DC levels in most countries, but starts at 60 V DC due
451 to North American safety standard deviations.
452 RFT DC voltage levels are characterized as follows:
453 – ≤ 60 V DC shall be treated like an ES1;
454 – > 60 V DC, but ≤ 120 V DC shall be treated like an ES3, (or as an RFT-V in North America);
455 – > 120 V DC shall be treated like (ES2, RFT )
456 NOTE 1 Treating RFT-C and RFT-V similarly to ES1/ES2 external circuits is considered to be acceptable, since the
457 controls on RFT [residual current devices (RCDs), voltage or current limits] and its limited accessibility, and
458 limitations on where it occurs in the network, substantially mitigate the safety hazard to customers of service providers
459 as well as the general public if a fault were to occur in the PSE (3.1.2), the PD (3.1.3), or the cabling.
460 Remote Feeding Telecommunications (RFT) powering is a very specific technology used for
461 supplying Network Interface Units (NIU’s), Integrated/intelligent Network Interface Devices
462 (INIDS), repeaters, ONU’s, and telecommunications down converters via typically a long
463 distance (hundreds of metres to many kilometers) over traditional outside plant twisted pair
464 telecommunication cables.
465 RFT voltages are isolated from the end customers network at the public network interface (PNI)
466 providing a safeguard to the customers network. Voltages on the customers side of the PNI
467 shall not exceed the ES2 levels as described in IEC 62368-1:2018 (in North America voltages
468 are limited to ES1 voltage limits).
469 Access to the conductors of the RFT circuit (3.1.5) is restricted to a telecommunications service
470 provider’s or utilities assigned and appropriately trained skilled person. Access by an
471 instructed person is restricted in accordance with 5.3.2.1 and 5.3.2.2 of IEC 62368-1:2018.
472 Access by an ordinary person is not allowed.
473 NOTE 2 Clause 6 covers power feeding to remote equipment at voltages in excess of the typical voltage limits for
474 telecommunications networks (for example, ES1/ES2), see Annex A.
475 Where a PD (3.1.3) or PSE (3.1.2) has the capability to change the power source and power
476 sink roles, all the requirements from this section for both the PD (3.1.3) and PSE (3.1.2) shall
477 apply to the power feeding circuit in each mode as applicable.
478 6.3 Connection to ICT networks operating at RFT
479 An RFT circuit (3.1.5) may be directly connected to an ICT network (3.1.4), but cannot be
480 directly connected to non- RFT circuits (3.1.5) in ICT networks (3.1.4).

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481 6.4 Electrically caused injury
482 6.4.1 Classification and limits of electrical energy sources
483 6.4.1.1 RFT‑C circuit (3.1.6) limits
484 6.4.1.1.1 General
485 Unless the current limits in 6.4.1.1.2 to 6.4.1.1.4 are inherently met, the RF T-C circuit
486 (3.1.6)shall have a monitoring and control device (for example, a balance control) that maintains
487 the required current limits.
488 6.4.1.1.2 Limits under normal operating conditions
489 Under normal operating conditions, an RFT-C circuit
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