prEN IEC 61851-23-1:2025

Conductive power and energy transfer systems for electric vehicles - Part 23-1: DC charging with an automatic connection system

This part of the IEC 61851 series, together with [IEC 61851-1 Ed. 3] and [IEC 61851-23 Ed 2.0]1, gives the requirements for DC electric vehicle charging stations with an Automated connection device (ACD) for conductive connection to the vehicle, with a rated supply voltage up to 1 000 V AC or up to 1 500 V DC and a rated output voltage up to 1 500 V DC. NOTE 1 This standard includes information on EV for conductive connection, but limited to the necessary content for describing the power and signalling interface. This part specifies the DC charging systems with an Automated connection device based on - system A described in Annex AA of [IEC 61851-23 Ed 2.0]. - system B described in Annex BB of [IEC 61851-23 Ed 2.0]. - system C described in Annex CC of [IEC 61851-23 Ed 2.0]. EMC requirements for DC EV charging stations are defined in [IEC 61851-21-2 Ed. 1 CDV]. This standard provides the general requirements for the control communication between a DC EV charging station and an EV. The requirements for digital communication between DC EV charging station and electric vehicle for control of DC charging are defined in [ISO15118-20 DIS] and [IEC 61851-24 Ed 2.0 CD]. This part only applies to Automatic couplers of category 2: using an electro-mechanical interface defined by [EN50696] for Systems described in Annex CC and Annex KK. System A, B are under consideration. This part does not apply for Automatic coupler of category 1: using a vehicle coupler defined by IEC 62196-2 or IEC 62196-3. This standard does not cover all safety aspects related to maintenance. Non-regulated DC EV supply equipment is not covered by this edition

Konduktive Ladesysteme für Elektrofahrzeuge – Teil 23-1: Gleichstromladen mit einer automatischen Kontaktvorrichtung

Sistem kabelskega napajanja električnih vozil - 23-1. del: Napajanje električnega vozila z enosmernim tokom z avtomatskim sklopnim sistemom

General Information

• Status: Not Published
• Publication Date: 31-Aug-2026
• Withdrawal Date: 10-Oct-2022
• Technical Committee: CLC/TC 69X - Electrical systems for electric road vehicles
• Drafting Committee: IEC/TC 69 - IEC_TC_69
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 02-May-2025
• Completion Date: 02-May-2025
• Ref Project: oSIST prEN IEC 61851-23-1:2025 - Electric vehicle conductive charging system - Part 23-1: DC charging with an automatic connection system

Overview

prEN IEC 61851-23-1:2025 specifies requirements for DC conductive charging of electric vehicles (EVs) using an Automated Connection Device (ACD). Intended for DC EV supply equipment (up to 1 000 V AC supply or up to 1 500 V DC supply, and output voltages up to 1 500 V DC), this part of the IEC 61851 series defines the power and signalling interface, control communication and safety requirements for automated conductive charging systems. It focuses on systems based on System A, B and C (see IEC 61851-23 Annexes) and applies specifically to automatic couplers of category 2 (electro-mechanical interface per EN 50696 for Annex CC/KK use). Non-regulated DC equipment and some maintenance safety aspects are excluded.

Key topics and technical requirements

• Scope of applicability: DC charging stations with Automated Connection Devices; rated supply/output voltages as above.
• Automated coupler categories: Applies to category 2 ACDs (EN 50696), not to category 1 vehicle couplers (IEC 62196-2/3).
• Power & signalling interface: Defines the conductive interface and necessary EV-related signalling limited to power and control.
• Control communication: General requirements for control communication between charger and EV; digital communication protocols referenced (ISO 15118-20, IEC 61851-24).
• Safety & EMC: Protection against electric shock, insulation checks, overload/short-circuit protection, emergency disconnects; EMC requirements referenced in IEC 61851-21-2.
• Construction & testing: Requirements for EV supply equipment construction, cable assemblies, adaptors, test methods and sequence diagrams for energy transfer.
• ACD-specific rules: Detailed sequences, timing, insulation resistance checks, forward power transfer (FPT) control, fault handling and system-specific annexes (A, B, J, etc.).
• Marking and documentation: Labelling, instructions and hazard communication for installers and users.

Practical applications and users

This standard is essential for:

• EV charger manufacturers designing automated DC charging stations and couplers
• Automotive OEMs integrating ACD-compatible interfaces on vehicles
• Charging infrastructure planners and operators deploying automated conductive chargers
• Test labs and certification bodies performing compliance and EMC testing
• Regulators and procurement teams specifying safe, interoperable DC charging solutions

Using IEC 61851-23-1 helps ensure interoperability, electrical safety, and controlled energy transfer in automated DC charging deployments.

Related standards

• IEC 61851-1 (general EV charging requirements)
• IEC 61851-23 Ed.2 (DC charging)
• IEC 61851-21-2 (EMC for DC charging)
• IEC 61851-24 (communication)
• ISO 15118-20 (digital communication for EV charging)
• EN 50696 (electro‑mechanical ACD interface)
• IEC 62196-2 / IEC 62196-3 (vehicle couplers - category 1, not covered)

Keywords: DC charging, automated connection device, ACD, automated coupler, EV supply equipment, IEC 61851-23-1, conductive charging, ISO 15118-20, EN 50696, EV charger safety.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2025
Sistem kabelskega napajanja električnih vozil - 23-1. del: Napajanje električnega
vozila z enosmernim tokom z avtomatskim sklopnim sistemom
Electric vehicle conductive charging system - Part 23-1: DC charging with an automatic
connection system
Konduktive Ladesysteme für Elektrofahrzeuge – Teil 23-1: Gleichstromladestation für
Elektrofahrzeuge mit einer automatischen Kontaktvorrichtung
Ta slovenski standard je istoveten z: prEN IEC 61851-23-1:2025
ICS:
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

69/1030/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61851-23-1 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-07 2025-05-02
SUPERSEDES DOCUMENTS:
69/943/NP, 69/983/RVN
IEC TC 69 : ELECTRICAL POWER/ENERGY TRANSFER SYSTEMS FOR ELECTRICALLY PROPELLED ROAD VEHICLES AND INDUSTRIAL TRUCKS
SECRETARIAT: SECRETARY:
Belgium Mr Peter Van den Bossche
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
SC 23H
ASPECTS CONCERNED:
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 t hey 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” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Electric vehicle conductive charging system - Part 23-1: DC Charging with an automatic connection system

PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
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 permis sion
in writing from IEC.
2 IEC 61851-23-1 ED1 © IEC 2024

1 CONTENTS
3 ________. 6
4 FOREWORD . 6
5 INTRODUCTION . 9
6 1 Scope . 10
7 2 Normative references . 10
8 3 Terms and definitions . 11
9 4 General requirements . 14
10 5 Classification . 14
11 6 Charging modes and functions . 14
12 7 Communications . 17
13 8 Protection against electric shock . 17
14 9 Conductive electrical interface requirements. 25
15 10 Requirements for adaptors . 26
16 11 Cable assembly requirements . 26
17 12 EV supply equipment constructional requirements and tests . 26
18 13 Overload and short circuit protection . 29
19 14 Automatic reclosing of protective devices . 29
20 15 Emergency switching or disconnect . 29
21 16 Marking and instructions . 29
22 101 Specific requirements for EV supply equipment . 30
23 17 Test methods . 31
24 201 ACD specific requirements . 32
25 34
26 Annex A . 35
27 AA.1 General . 35
28 AA.2 Circuit diagrams . 35
29 AA.3 Parameters of control pilot circuit . 36
30 AA.4 Forward power transfer control process under normal condition . 39
31 AA.5 Safety requirements under failure mode . 41
32 AA.6 Timing sequence diagram of forward power transfer . 44
33 AA.7 Side B current regulation in CCM . 47
34 AA.8 Insulation resistance check before energy transfer. 48
35 AA.9 Side B voltage regulation in CVM . 48
36 AA.10 Periodic and random deviation (voltage ripple at side B in CVM) . 48
37 AA.11 Energy transfer control mode . 48
38 AA.12 Standby mode . 48
39 AA.13 Smart charging . 48
40 AA.14 Minimum cross-sectional area of the protective conductor . 48
41 AA.200 Additional functions. 48

IEC 61851-23-1 ED1 © IEC 2024 3

42 Annex B (normative)  DC EV supply equipment of system C with an automated
43 connection device . 49
44 AA.1 General . 49
45 B.1 Circuit diagrams . 49
46 B.2 Process of energy transfer . 51
47 B.3 Safety related functions . 65
48 B.4 Additional functions . 67
49 B.5 Specific requirements . 68
50 B.6 General test conditions . 68
51 E.8 Automated connection device . 79
52 Annex F . 80
53 Annex G . 81
54 82
55 Multioutlet (AC/DC isolated) DC EV supply equipment . 82
56 FF.2 Classification of multi-outlet DC EV supply equipment . 82
57 Annex H Communication and energy transfer process between DC EV supply
58 equipment and EV . 83
59 FF.1 Digital communication between the EV supply equipment and the EV . 83
60 H.1 System configuration . 83
61 H.2 Energy transfer control process and state . 83
62 Annex I . 84
63 FF.1 General . 84
64 HC.3 Conditional dependent thresholds . 86
65 (informative)  Consideration when road vehicle is interconnected with an off -
66 board charger . 87
67 JJ.1 General . 87
68 I.1 Open interface on the roof of the vehicle . 87
69 I.2 Isolation resistance. 88
70 Annex J (normative)  DC EV supply equipment based on System C with 3 contacts
71 automatic coupler . 89
72 JJ.1 General . 89
73 J.1 Circuit diagrams . 89
74 J.2 Process of energy transfer . 96
75 J.3 Safety measures . 109
76 J.4 Additional functions . 112
77 J.5 Specific requirements . 113
78 J.6 General test conditions . 113
79 J.7 Automated connection device . 124
80 J.8 Ground level ACD case . 124
82 Figure 201 – Case D connection . 12
83 Figure 202 – Case E connection . 12
84 Figure 106 – Measurement of the touch leakage current . 19
85 Figure 203 – Minimum clearances to accessible live parts . 21

4 IEC 61851-23-1 ED1 © IEC 2024

86 Figure 204 – Protection by obstacles . 22
87 Figure 205 – Protection by obstacles test method with the jointed test finger mounted
88 on a straight stick. . 22
89 Figure 206 – Jointed test finger mounted on a straight stick . 23
90 Figure 207 – Protection by electro-sensitive equipment . 23
91 Figure 1 – Example of an SPD-assembly having one voltage switching type SPD
92 between side B live conductors (DC+/DC-) and protective conductor . 28
93 Figure 208 - Hazardous voltage logo according to ISO 7010 – W012 . 30
94 Figure 209 – General test setup for system C with an automated connection device . 31
95 Figure BA.4 – FPT control sequence . 40
96 Figure CC.200 − Recommended control pilot circuit for case D ACD . 50
97 Figure CB.201 – Circuit diagram of a system C EV supply equipment with automatic
98 coupler . 51
99 Figure B.202 – Example of a sequence diagram . 53
100 Figure CC.4 − Sequence diagram for normal start up . 54
101 Figure CC.5 − Sequence diagram for normal shutdown . 58
102 Figure CC.8 − Sequence diagram for an emergency shutdown executed by the EV  –
103 case D . 61
104 Figure HI.2 – Leakage current and impulse current in relation to limits in IEC 60479
105 series . 86
106 Figure JJ.1 Hazardous voltage logo according to –SO 7010 - W012 . 87
107 Figure KK. 206 CP radio signal modulation oscillograms . 96
109 Table 103 – Voltage threshold for emergency shutdown reaction for system B and
110 system C . 15
111 Table 112 – Safety provisions for protection against electric shock for EV supply
112 equipment at side B . 24
113 Table 118 − Current ripple limit of DC EV supply equipment . 30
114 Table 120 – Recommended circuit parameters of the test load . 31
115 Table CB.200 – Component values and tolerances for automatic coupler . 51
116 Table CC.201 - Message code mapping for sequence diagram . 52
117 Table B.3 – Example of a sequence description . 53
118 Table CC.5 − Sequence description for normal start up . 54
119 Table CC.6 − Sequence description for normal shutdown . 59
120 Table B.10 – Overview of error and emergency shutdown cases . 60
121 Table CC.13 − Sequence diagram an emergency shutdown executed by the EV – case
122 D 61
123 Table B.14 – Sequence diagram an emergency shutdown executed by the EV supply
124 equipment . 63
125 Table CC.18 - Insulation states and DC EV supply equipment reaction based on the
126 measured insulation resistance . 66
127 Table CC.5 Emergency shutdown timing parameters . 67
128 Table HH.1 - Exemplary determination if touch current limit is fulfilled by design . 84
129 Table KK 5. Example of a sequence description . 98
130 Table KK 7. Overview of error and emergency shutdown cases . 104

IEC 61851-23-1 ED1 © IEC 2024 5

131 Table CC.18 - Insulation states and DC EV supply equipment reaction based on the
132 measured insulation resistance . 110
6 IEC 61851-23-1 ED1 © IEC 2024

136 INTERNATIONAL ELECTROTECHNICAL COMMISSION
137 ________
139 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –
141 Part 23-1: DC electric vehicle supply equipment with an automated
142 connection device
144 FOREWORD
146 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
147 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
148 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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154 Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two
155 organizations.
156 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
157 consensus of opinion on the relevant subjects since each technical committee has representation from all
158 interested IEC National Committees.
159 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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163 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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165 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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169 6) All users should ensure that they have the latest edition of this publication.
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173 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
174 Publications.
175 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
176 indispensable for the correct application of this publication.
177 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
178 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
179 International Standard IEC 61851-23-1 has been prepared by IEC technical committee 69:
180 Electric road vehicles and electric industrial trucks.
181 The text of this standard is based on the following documents:
FDIS Report on voting
69/XX/FDIS 69/XX/RVD
183 Full information on the voting for the approval of this standard can be found in the report on
184 voting indicated in the above table

IEC 61851-23-1 ED1 © IEC 2024 7

8 IEC 61851-23-1 ED1 © IEC 2024

187 This publication has been drafted in accordance with the ISO/IEC Directives, 185 Part 2.
188 This standard is to be read in conjunction with [IEC 61851-23 Ed 2.0] and [IEC 61851-1:2017].
189 The clauses of particular requirements in this standard supplement or modify the corresponding
190 clauses in [IEC 61851-23 Ed 2.0] and [IEC 61851-1:2017]. Where the text of subsequent
191 clauses indicates an "addition" to or a "replacement" of the relevant requirement, test
192 specification or explanation of Part 23, these changes are made to the relevant text of Part 23,
193 which then becomes part of this standard. Where no change is necessary, the words "This
194 clause of Part 23 is applicable" are used. The new clauses, which are not included in Part 23,
195 have a clause number starting from 201, e.g. 3.201, 201.1, etc. The annexes of this standard
196 are numbered using double-alphabet, e.g. Annex AA, to be in line with the annexes in Part 23.
197 If the in [IEC 61851-23 Ed 2.0] and [IEC 61851-1:2017] is read in conjunction with this document
198 the following terms have to be replaced:
199 - Vehicle coupler, as defined by IEC 61851-1:2017, by ‘Automatic coupler’ as defined in
200 clause 3
201 - Vehicle connector, as defined by IEC 61851-1:2017, by ‘part of the automatic coupler
202 mounted on the EV supply equipment’
203 - Vehicle inlet, as defined by IEC 61851-1:2017, by ‘part of the automatic coupler mounted
204 on the EV’
205 A list of all parts in the IEC 61851 series, published under the general title Electric vehicle
206 conductive charging system, can be found on the IEC website.
207 In this standard, the following print types are used:
208 – test specifications: italic type.
209 – notes: smaller roman type.
211 The committee has decided that the contents of this publication will remain unchanged until the
212 stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
213 the specific publication. At this date, the publication will be
214 • reconfirmed,
215 • withdrawn,
216 • replaced by a revised edition, or
217 • amended.
The National Committees are requested to note that for this publication the stability date is
December 2019.
THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE DELETED
AT THE PUBLICATION STAGE.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
IEC 61851-23-1 ED1 © IEC 2024 9

222 INTRODUCTION
224 The introduction and commercialisation of electric vehicles has been accelerated in the global
225 market, responding to the global concerns on CO2 reduction and energy security. Concurrently,
226 the development of charging infrastructure for electric vehicles has also been expanding. As a
227 complement to the DC EV supply equipment with a vehicle connector, DC supply equipment
228 using an Automated connection device is recognized as an alternative solution for electric
229 vehicles e.g. buses and trucks.
230 The international standardization of charging infrastructure with an automated connection
231 device is indispensable for the diffusion of electric vehicles, and this standard is developed for
232 the manufacturers’ convenience by providing general and basic requirements for DC EV supply
233 equipment using an automatic conductive connection to the vehicle.
10 IEC 61851-23-1 ED1 © IEC 2024

235 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –
237 Part 23-1: DC electric vehicle supply equipment with an Automated
238 connection device
240 1 Scope
241 This part of the IEC 61851 series, together with [IEC 61851-1:2017] and [IEC 61851-23 Ed
242 2.0], provides the requirements for DC EV supply equipment with an automated connection
243 device (ACD) for conductive connection to the vehicle, with a rated maximum voltage at side
244 A of up to 1 000 V AC or up to 1 500 V DC and a rated maximum voltage at side B up to 1 500
245 V DC.
246 NOTE 1 This standard includes information on EV for conductive connection, but limited to the necessary content for
247 describing the power and signalling interface.
248 This document specifies the DC EV supply equipment with an automated connection device
249 based on
250 • system B described in Annex BB of [IEC 61851-23 Ed 2.0].
251 • system C described in Annex CC of [IEC 61851-23 Ed 2.0].
252 The requirements for reverse power transfer (RPT) and BPT are under consideration and are
253 not specified in this document.
254 EMC requirements for DC EV supply equipment are defined in [IEC 61851-21-2:2018].
255 This standard provides the general requirements for the control communication between a DC
256 EV supply equipment and an EV.
257 The requirements for digital communication between DC EV supply equipment and electric
258 vehicle for control of DC energy transfer are defined in [ISO 15118-20:2022] and [IEC 61851-
259 24 Ed 2.0 CD].
260 This part only applies to automatic couplers of category 2: using an electro-mechanical interface:
261 automatic coupler for an automated charging system according to [IEC 63407].
262 This part does not apply to automatic coupler of category 1 as described in [IEC 61851-27 CD]
263 This part does not apply to automatic coupler of category 3 as described in [IEC 61851-26 CD]
264 This standard does not cover all safety aspects related to maintenance.
265 Requirements for systems not providing simple separation or protective separation between
266 side A and side B are under consideration.
267 Requirements for EV supply equipment without current, voltage and/or power control are under
268 consideration.
269 EV supply equipment in compliance with this document are not intended to provide energy
270 transfer to a single EV with:
271 – multiple vehicle connectors of the same EV supply equipment; or
272 – multiple EV supply equipment.
273 NOTE Requirements for EVs mated to an EV supply equipment are specified in ISO 17409: 2020. ISO 17409 will
274 be revised to ISO 5474 series (under development).
275 2 Normative references
276 IEC 61851-23:2023, Clause 2, is applicable except as follows:

IEC 61851-23-1 ED1 © IEC 2024 11

278 Addition:
279 IEC 61496-1:2012 Safety of machinery - Electro-sensitive protective equipment - Part 1: General
280 requirements and tests
282 ISO 13855:2010 Safety of machinery — Positioning of safeguards with respect to the approach
283 speeds of parts of the human body
285 IEC 62128-1:2013 RAILWAY APPLICATIONS – FIXED INSTALLATIONS – ELECTRICAL SAFETY,
286 EARTHING AND THE RETURN CIRCUIT – Part 1: Protective provisions against electric shock
288 ISO 15118-8 Ed. 1 Vehicle to grid communication interface - Part 8: Physical layer and data link layer
289 requirements for wireless communication
291 ISO 15118-20 Road vehicles — Vehicle to grid communication interface — Part 20: 2nd generation
292 network and application protocol requirements
294 IEC 63407 Conductive charging of electric vehicles – Contact interface for automated connection
295 device (ACD).
297 3 Terms and definitions
298 IEC 61851-23:2023, Clause 3, is applicable except as follows:
299 Addition:
300 3.1 Electric supply equipment
301 3.1.1 3.1.201
302 case D
303 connection of an EV to a supply network utilizing an automatic coupler which has an ACD on
304 the EV supply equipment
—————————
Under preparation. Stage at the time of publication: CD

12 IEC 61851-23-1 ED1 © IEC 2024

306 Key
a automated connection device c automatic coupler
b ACD counterpart
308 Figure 201 – Case D connection
309 Note 1 to entry: The position of the ACD is an example implementation.
310 3.1.2 3.1.202
311 case E
312 connection of an EV to a supply network utilizing an automatic coupler which has an ACD on
313 the EV
315 Key
a automated connection device c automatic coupler
b ACD counterpart
316 Figure 202 – Case E connection
317 Note 1 to entry: The position of the ACD is an example implementation.
318 3.1.3 3.1.203
319 automated connection device
320 ACD
321 active device where the physical connection providing an electromechanical interface between
322 EV supply equipment and vehicle is made without user interaction

IEC 61851-23-1 ED1 © IEC 2024 13

323 3.1.4 3.1.204
324 ACD counterpart
325 passive device which is used in combination with an ACD to make the physical connection
326 providing an electromechanical interface between EV supply equipment and vehicle without
327 user interaction
328 3.1.5 3.1.205
329 automatic coupler
330 system comprising of an ACD and ACD counterpart
331 3.1.6 3.1.206
332 mechanical disconnection
333 physical disconnection between ACD and ACD counterpart
334 3.1.7 3.1.207
335 ground level automated connection device
336 glACD
337 automated connection device located on ground level
338 3.1.8 3.1.208
339 electro-sensitive protection equipment
340 ESPE
341 assembly of devices and/or components working together for protective tripping or presence -
342 sensing purposes and comprising as a minimum of:
343 – a sensing device;
344 – controlling/monitoring devices;
345 – output signal switching devices and/or a safety-related data interface.
346 Note 1 to entry: The safety-related control system associated with the ESPE, or the ESPE itself, may further include
347 a secondary switching device, muting functions, stopping performance monitor, etc. (see Annex A of IEC 61496-
348 1:2012).
349 Note 2 to entry: A safety-related communication interface can be integrated in the same enclosure as the ESPE .
350 [SOURCE: IEC 61496-1:2012, 3.5]
351 3.1.9 3.1.209
352 charging device status
353 The state of the ACD:
354 – Home (signal 1 / home position is active as defined in [IEC 63407]): position where the ACD
355 is not engaged with its counterpart and where safe clearance is present with street and
356 infrastructure
357 – Moving (signal 1 and signal 2 are inactive): ACD is between home and end position
358 – End position (signal 2 / working position is active as defined in [IEC 63407]): position
359 reached when the ACD and the fixed ACD counterpart have mated and when the physical
360 contact is established, and energy transfer is allowed
361 1.7 General terms
362 Addition:
363 3.1.10 3.7.201
364 arm’s reach
365 zone of accessibility to touch extending from any point on a surface where persons usually
366 stand or move about to the limits which a person can reach with the hand, in any direction,
367 without assistance
369 [SOURCE: IEC 60050-826, 826-12-19]

14 IEC 61851-23-1 ED1 © IEC 2024

370 3.1.11 3.7.202
371 EV contactors
372 contactors of the EV that connect the automatic coupler with the EV DC- bus
373 3.1.12 3.7.203
374 EV supply equipment contactors
375 contactors of the EV supply equipment that connect the automatic coupler with the EV supply
376 equipment DC- bus
377 3.1.13 3.7.204
378 automatic coupler of category 1
379 ACD using a vehicle connector and a vehicle plug specified within IEC 62196-2, IEC 62196-3
380 or TS 63379 as specified in [IEC 61851-27 CD]
381 3.1.14 3.7.205
382 automatic coupler of category 2
383 automatic coupler for an automated charging system according to [IEC 63407]
384 3.1.15 3.7.206
385 automatic coupler of category 3
386 automatic coupler for an automated charging system according to [IEC 61851-26]
387 Note 1 to entry: IEC 61851-26 specifies the use of automatic coupler for both AC and DC charging.
388 4 General requirements
389 IEC 61851-23:2023, Clause 4, is applicable.
390 5 Classification
391 IEC 61851-23:2023, Clause 5, is applicable except as follows:
392 Addition:
393 1.201 Position of the ACD
394 – case D
395 – case E
396 6 Charging modes and functions
397 IEC 61851-23:2023, Clause 6, is applicable except as follows:
398 1.3 Functions provided in Mode 4
399 6.1.1 Mandatory functions in Mode 4
400 6.1.1.1 General
401 Replacement:
402 The EV supply equipment shall supply a DC current or voltage to the EV battery system in
403 accordance with a EVCC request.
404 The following functions shall be provided by EV supply equipment:
405 – continuous continuity checking of the protective conductor according to 6.3.1.2;
406 – verification that the EV is properly connected to the EV supply equipment according to
407 6.3.1.3;
408 – energization of the power supply to the EV according to 6.3.1.4;
409 – de-energization of the power supply to the EV according to 6.3.1.5;
410 – maximum allowable current according to 6.3.1.6;
411 – DC supply for EV according to 6.3.1.101;

IEC 61851-23-1 ED1 © IEC 2024 15

412 – measuring current and voltage according to 6.3.1.102;
413 – compatibility check according to 6.3.1.104;
414 – insulation resistance check before energy transfer according to 6.3.1.106;
415 – protection against overvoltage between DC+ and DC- according to 6.3.1.107;
416 – control circuit supply integrity according to 6.3.1.108;
417 – short circuit check before energy transfer according to 6.3.1.109;
418 – user initiated shutdown according to 6.3.1.110;
419 – overload protection for parallel conductors (conditional function) according to 6.3.1.111;
420 – voltage limitation between side B live parts (DC+ and DC-) and protective conductor
421 according to 6.3.1.112.
422 – shutdown of EV supply equipment according to 6.3.1.113.
423 The EV manufacturer should consider the requirements for overvoltage and overcurrent
424 according to this document and ISO 17409.
425 If the EV supply equipment can supply more than one EV simultaneously, the EV supply
426 equipment shall provide all functions listed above independently at each vehicle connector.
427 6.1.1.2 Continuous continuity checking of the protective conductor
428 Addition:
430 For systems with a case D or case E connection, protective conductor continuity between the
431 EV supply equipment and the EV shall be monitored. For the rated voltage of 60 V DC or higher,
432 the EV supply equipment shall trigger an emergency shutdown after the electrical continuity of
433 protective conductor between EV supply equipment and EV is lost for 20 ms or more. The EV
434 supply equipment may trigger an emergency shutdown when the electrical continuity of
435 protective conductor between EV supply equipment and EV is lost for less than 20 ms.
436 NOTE This clause addresses only the continuity measurement between the DC EV supply equipment and the
437 vehicle. The impedance level of the protective conductor connection is not addressed.
438 6.1.1.3 Verification that the EV is properly connected to the EV supply equipment
439 Replacement:
440 The EV supply equipment shall be able to determine that the EV is properly connected to the
441 EV supply equipment.
442 Proper connection is assumed when the continuity of the control pilot circuit is detected and
443 ACD has reached end position.
444 NOTE Signal 2 is defined in [IEC 63407].
445 1.3.1.103 Latching of the vehicle connector
446 IEC 61851-23:2023, 6.3.1.103, is not applicable.
447 1.3.1.106 Protection against overvoltage at side B between DC+ and DC
448 1.3.1.106.2 Protection against overvoltage at side B between DC+ and DC- by
449 emergency shutdown
450 IEC 61851-23:2023, 6.3.106.2, is applicable except Table 103:
451 Table 103 – Voltage threshold for emergency shutdown reaction for system B and
452 system C
Negotiated maximum voltage at side B Voltage threshold
(U) V
U ≤ 500 V 550
16 IEC 61851-23-1 ED1 © IEC 2024

500 V < U ≤ 750 V 825
750 V < U ≤ 850 V 935
850 V < U ≤ 1 000 V 1 100
1 000 V < U ≤ 1250 V 1 375
454 1.3.1.107 Verification of vehicle connector latching
455 IEC 61851-23:2023, 6.3.1.107 is not applicable.
456 6.1.1.4 Control circuit supply integrity
st
457 Replacement of the 1 paragraph:
459 If an earth fault, short circuit or overcurrent is detected at side B, the power supply for the control
460 circuit of the EV supply equipment shall not be interrupted until the FPT sequence is completed.
461 1.3.1.110 User initiated shutdown
462 Replacement:
463 The EV supply equipment may have means to allow the user to initiate the normal shutdown.
464 If such means are provided, compliance is checked for system C by the tests in CC.9.3.20. For
465 system B, the test is under consideration.
466 1.3.1.112 Voltage limitation between side B live parts (DC+ and DC-) and protective
467 conductor
468 6.1.1.4.1 Maximum voltage between side B live parts (DC+/DC-) and the protective
469 conductor in case of an insulation fault at side B to the protective
470 conductor
471 Addition:
472 For EV supply equipment based on case 3, with a rated maximum voltage of the EV supply
473 equipment at side B of > 1000 V DC and ≤ 1 250 V DC: if a voltage more than 110 % of the
474 present voltage at side B between DC+ and DC- is present for more than 1 s between side B
475 live parts (DC+/DC-) and the protective conductor, the EV supply equipment shall trigger and
476 complete an error shutdown in 4 s or less. See Figure 105.
477 For EV supply equipment based on case 3, with a rated maximum voltage of the EV supply
478 equipment at side B of > 1000 V DC and ≤ 1 250 V DC: if a voltage more 1 250 V is present for
479 more than 1 s between side B live parts (DC+/DC-) and the protective conductor, the EV supply
480 equipment shall trigger and complete an error shutdown in 4 s or less. See Figure 105.
481 1.3.1.113 Shutdown of DC EV supply equipment
482 6.1.1.4.2 Error shutdown
483 Addition:
484 After the error shutdown is triggered, the ACD shall disconnect and go to home position.
485 NOTE Detecting an isolation error is considered a trigger for an error shutdown.
486 6.1.1.4.3 Emergency shutdown
487 Replacement:
488 After the emergency shutdown is triggered by the EV supply equipment, the EV supply
489 equipment shall reduce:
490 – The present current at side B ≤ 5 A within 70 ms;

IEC 61851-23-1 ED1 © IEC 2024 17

491 – and maintain the present voltage at side B ≤ 60 V between DC+ and DC-, between DC+ and
492 the protective conductor, and DC- and the protective conductor in 1 s or less for system B,
493 and in 80 ms or less for system C.
494 NOTE The timing can only be met if the vehicle contactors are opened and the capacitance between DC+ and DC -
495 in the vehicle (between interface and contactors) is negligible.
496 After the emergency shutdown is triggered, the ACD shall disconnect and go to home position.
497 NOTE Pressing the emergency stop button is considered a trigger for an emergency shutdown.
498 Further requirements are specified in AA.4.3.5.3, BB.5.1 of [IEC 61851-23 Ed 2.0], CC.3.4 and
499 KK.3.4.
500 NOTE A welded contactor on the vehicle can prevent the EV supply equipment to reduce the voltage.
501 Compliance for system B is checked by the following test. Compliance for system C is checked by
502 CC.7.5.4, or KK.7.5.4.
503 The test system is shown in Figure 129 of [IEC 61851-23 Ed. 2.0].
504 The test shall be performed according to the following procedure.
505 1) Connect the EV supply equipment to a test load with dedicated EV simulator with a test load
506 for each system.
507 2) Start energy transfer with the procedure specified by the EV supply equipment
508 manufacturer.
509 3) Confirm that VT8 is at the rated maximum voltage of the EV supply equipment at side B and
510 the EV supply equipment is operating at the rated maximum current at side B.
511 4) Open the relay for each system as specified below:
512 – for system B: S 4
T
513 5) The EV supply equipment shall trigger and complete an emergency shutdown, displaying a
514 relevant alarm or error information, if any, according to the following:
515 – for system B, according to BB.5.1 and Table BB.3.
516 6.1.2 Optional functions for Mode 4
517 1.3.1.3 Intentional and unintentional disconnection of the vehicle connector and/or
518 the EV plug
519 IEC 61851-23:2023, 6.3.2.3, is not applicable.
520 6.1.2.1 Mode 4 using the combined charging system
521 IEC 61851-23:2023, 6.3.2.4, is not applicable.
522 7 Communications
523 IEC 61851-23:2023, Clause 7, is applicable except as follows:
524 1.3.101 Basic communication interface
525 Replacement:
526 Typical interfaces of control pilot function on DC EV supply equipment are specified in Annex
527 BB, Annex CC and Annex KK. Each system shall carry out control pilot function through the
528 control pilot conductors and terminals specified in [IEC 63407].
529 8 Protection against electric shock
530 IEC 61851-23:2023, Clause 8, is applicable except as follows:
531 1.101 General provisions
532 1.101.2 Intended use and reasonably foreseeable misuse
533 Replacement:
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