prEN IEC 61851-1:2025

SLOVENSKI STANDARD
01-oktober-2025
Sistemi za prenos prevodne moči in energije za električna vozila - 1. del: Splošne
zahteve sistema in posebne zahteve za polnilno postajo za električna vozila v
načinu 3
Conductive power and energy transfer systems for electric vehicles - Part 1: General
system and specific mode 3 EV charging station requirements
Konduktive Ladesysteme für Elektrofahrzeuge - Teil 1: Allgemeine Anforderungen
Système de transfert de puissance/énergie conductive pour véhicules électriques -
Partie 1: Exigences générales et exigences pour station de charge en mode 3
Ta slovenski standard je istoveten z: prEN IEC 61851-1:2025
ICS:
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

69/1069/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61851-1 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-08-29 2025-11-21
SUPERSEDES DOCUMENTS:
69/971/CD, 69/1067/CC
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):
TC 8,TC 23,SC 23E,SC 23H,TC 64,TC 121
ASPECTS CONCERNED:
Safety
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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.
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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).

TITLE:
Conductive power and energy transfer systems for electric vehicles - Part 1: General system
and specific Mode 3 EV charging station requirements

PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
elec tronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
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IEC CDV 61851-1 © IEC 2025
1 CONTENTS
2 CONTENTS . 1
3 FOREWORD . 8
4 INTRODUCTION . 10
5 1 Scope . 12
6 2 Normative references . 13
7 3 Terms and definitions . 17
8 3.1 Electric supply equipment . 17
9 3.2 Earthing and protection against electric shock . 19
10 3.3 Modes and functions . 22
11 3.4 Cords, cables and connection means . 25
12 3.5 Service and usage . 29
13 3.6 General terms . 30
14 4 System requirements . 35
15 4.1 General requirements . 35
16 4.2 Charging Modes . 35
17 4.2.1 Mode 1 . 35
18 4.2.2 Mode 2 . 36
19 4.2.3 Mode 3 . 36
20 4.2.4 Mode 4 . 36
21 4.3 System functional requirements in Mode 2, 3 and 4 . 36
22 4.3.1 General . 36
23 4.3.2 Continuous continuity checking of the protective conductor . 37
24 4.3.3 Verification that the EV is properly connected to the EV supply
25 equipment. 37
26 4.3.4 Energization of the power supply to the EV . 37
27 4.3.5 De-energization of the power supply to the EV . 38
28 4.3.6 Specification of maximum allowable current . 38
29 4.3.7 Intentional and unintentional unmating of the vehicle connector and/or
30 the EV plug . 38
31 4.3.8 Optional functions . 38
32 4.4 Selection of accessories, cables and adaptors . 41
33 4.4.1 General . 41
34 4.4.2 Standard accessories . 41
35 4.4.3 EV plugs, EV socket-outlets, vehicle connectors . 41
36 4.4.4 Cable assembly . 41
37 4.4.5 Adaptors . 42
38 5 Classification of Mode 3 EV charging station . 43
39 5.1 According to the service conditions . 43
40 5.2 According to the mounting method . 43
41 5.3 According to the mechanical resistance . 43
42 5.4 According to the connection case . 43
43 5.5 According to the power distribution system . 43
44 5.6 According to the protection against electric shock . 44
45 5.7 According to the communication function with the vehicle . 44
46 5.8 According to the ability of Reverse Power Transfer . 44
47 6 Service conditions for Mode 3 EV charging station . 44
IEC CDV 61851-1 © IEC 2025
48 7 Void . 44
49 8 Requirements for Mode 3 EV charging station . 44
50 8.1 Strength of materials and parts . 44
51 8.1.1 General . 44
52 8.1.2 Protection against corrosion . 45
53 8.1.3 Damp heat resistance . 45
54 8.1.4 Properties of insulating materials . 45
55 8.1.5 Resistance to UV radiation . 46
56 8.1.6 Mechanical strength. 47
57 8.1.7 Lifting provisions . 48
58 8.2 Clearances and creepage distances . 48
59 8.2.1 General . 48
60 8.2.2 Clearances and creepages distances for inner layers of printed wiring
61 boards . 49
62 8.3 Protection against access to hazardous parts, against solid foreign objects
63 and water (IP code) . 50
64 8.3.1 Degrees of protection provided by Mode 3 EV charging station
65 enclosures . 50
66 8.3.2 Degrees of protection provided by basic interface accessories . 50
67 8.4 Temperature rise . 50
68 8.5 Operation at low temperatures . 51
69 8.6 Resistance to abnormal operating and fault conditions . 51
70 8.7 Incorporation of components . 52
71 8.7.1 General . 52
72 8.7.2 Surge protective devices and surge protective components . 52
73 8.7.3 Conductive electrical interface requirements . 54
74 8.7.4 Cable assembly requirements . 55
75 8.7.5 Emergency switching or disconnect equipment (optional) . 56
76 8.7.6 Switching devices intended to supply the connecting points . 57
77 8.8 Internal electrical circuits and connections . 58
78 8.9 Protection against electric shock . 58
79 8.9.1 General requirements for protection against electric shock . 58
80 8.9.2 Handling of welded contacts . 59
81 8.9.3 Residual current protective devices protecting connecting points . 60
82 8.9.4 Automatic or remote reclosing of protective devices . 61
83 8.9.5 Protective conductor . 64
84 8.9.6 Insulation resistance . 64
85 8.9.7 Touch current . 64
86 8.9.8 Protections against hazards caused by stored energy. 65
87 8.9.9 Dielectric withstand voltage . 65
88 8.9.10 Safety requirements for auxiliary circuits . 65
89 8.10 Protection against overcurrent . 66
90 8.10.1 General . 66
91 8.10.2 Overload protection of the cable assembly. 67
92 8.10.3 Short-circuit protection of the cable assembly . 67
93 8.11 Functional requirements of Mode 3 EV charging station . 67
94 8.12 Requirements for Mode 3 EV charging station capable of reverse power
95 transfer . 68
96 9 Marking and instructions for Mode 3 EV charging station . 68
97 9.1 Installation manual . 68
IEC CDV 61851-1 © IEC 2025
98 9.2 User manual . 69
99 9.3 Marking . 70
100 9.4 Status indication . 70
101 10 Design verifications for Mode 3 EV charging station . 72
102 10.1 General . 72
103 10.2 Damp heat test . 72
104 10.3 Minimum temperature functional test . 73
105 10.4 Abnormal operating and simulated fault condition tests . 73
106 10.4.1 General . 73
107 10.4.2 Pass criteria . 73
108 10.4.3 Simulated fault conditions tests . 74
109 10.4.4 Abnormal operating conditions tests . 74
110 10.5 Test of the anchorage of the side B cable assembly . 75
111 10.6 Tests of coordination with short-circuit protective devices (SCPDs) . 78
112 10.7 Simulation of switching device welded contacts . 79
113 10.7.1 Test conditions . 79
114 10.7.2 Pass Criteria . 79
115 10.8 Tests for automatic or remote reclosing of protective devices . 80
116 10.9 Protective conductor overcurrent test . 80
117 10.10 Insulation resistance test . 81
118 10.11 Touch current test . 82
119 10.12 Stored energy test . 82
120 10.13 AC withstand voltage test . 82
121 10.14 Durability test for marking . 84
122 11 Operating and servicing conditions for Mode 3 EV charging station . 84
123 12 Routine verifications for Mode 3 EV charging station . 84
124 Annex A (normative) Control pilot function through a control pilot circuit using a PWM
125 signal and a control pilot conductor . 85
126 A.1 General . 85
127 A.2 Control pilot circuit . 85
128 A.2.1 General . 85
129 A.2.2 Typical control pilot circuit . 86
130 A.2.3 Additional components and high-frequency signals . 86
131 A.3 Requirements for parameters and system behaviour . 88
132 A.3.1 Control pilot circuit parameters and values . 88
133 A.3.2 System states . 90
134 A.3.3 State transitions and sequences . 95
135 A.3.4 Generation and interpretation of PWM duty cycle . 115
136 A.3.5 Switching between three-phase and single-phase supply . 116
137 A.4 Test procedures . 116
138 A.4.1 General . 116
139 A.4.2 Constructional requirements of the EV simulator . 116
140 A.4.3 Test procedure . 117
141 A.4.4 Measurement criteria . 118
142 A.4.5 Oscillator frequency and generator voltage, duty cycle and pulse wave
143 shape test . 119
144 A.4.6 CP state tolerances test. 122
145 A.4.7 State detection test . 125
146 A.4.8 Sequences test . 127
IEC CDV 61851-1 © IEC 2025
147 A.4.9 Test of interruption of the protective conductor . 132
148 A.4.10 Test of short-circuit values of the voltage . 134
149 A.4.11 Test of interruption of the control pilot conductor . 135
150 A.4.12 Example of a test simulator of the vehicle . 135
151 A.5 Information for implementation . 139
152 A.5.1 Retaining a valid authorization until reaching CP state B . 139
153 A.5.2 Load control using transitions between state x1 and x2 . 140
154 A.5.3 Information on difficulties encountered with some legacy EVs for wake-
155 up after a long period of inactivity (informative) . 140
156 A.5.4 Information on legacy EVs using simplified control pilot . 140
157 A.5.5 Ventilation during supply of energy . 141
158 Annex B (normative) Proximity detection and cable current coding circuits for the
159 basic interface . 142
160 B.1 Circuit diagram for vehicle couplers using a connection switch for proximity
161 detection without current coding. 142
162 B.2 Circuit diagram for vehicle couplers using a proximity contact for
163 simultaneous proximity detection and current coding . 143
164 B.3 Circuit diagram for vehicle couplers using a connection switch and current
165 coding . 145
166 Annex C (void) . 147
167 Annex D (normative) Control pilot function that provides LIN communication using the
168 control pilot circuit . 148
169 D.1 Overview. 148
170 D.1.1 General . 148
171 D.1.2 Terms and abbreviations . 148
172 D.1.3 Abbreviated terms . 150
173 D.2 Control pilot circuit . 151
174 D.2.1 General . 151
175 D.2.2 Parameters . 151
176 D.2.3 Generation and detection of CP voltage by the EV supply equipment . 152
177 D.2.4 Detection of the control pilot voltage by the EV . 152
178 D.2.5 LIN transceiver . 153
179 D.3 Requirements for parameters and system behavior . 153
180 D.3.1 General . 153
181 D.3.2 Control pilot circuit states and transitions . 153
182 D.4 System requirements . 156
183 D.4.1 General . 156
184 D.4.2 Control of LIN signals . 156
185 D.4.3 Control of the switch S2 and the vehicle load current . 157
186 D.4.4 Control of the switching device in the EV supply equipment . 158
187 D.4.5 Control of latching and unlatching of IEC 62196-2 type 2 socket-outlets
188 and vehicle inlets . 159
189 D.5 Typical coupling session . 160
190 D.6 LIN Communication . 161
191 D.6.1 General . 161
192 D.6.2 Schedules. 161
193 D.6.3 Frames . 172
194 D.6.4 Signals . 175
195 D.7 Requirements for EV supply equipment and EVs that implement the control
196 pilot functions defined in this Annex and in Annex A . 184
197 D.7.1 General . 184
IEC CDV 61851-1 © IEC 2025
198 D.7.2 Interoperability between EV supply equipment and EVs . 184
199 D.7.3 Control pilot circuit hardware . 185
200 D.7.4 Control pilot circuit functionality . 185
201 D.7.5 Sequence to select the control pilot functions described in this Annex or
202 the control pilot functions described in Annex A after mating . 186
203 D.8 Procedures for test of EV supply equipment . 187
204 D.8.1 General . 187
205 D.8.2 Test of normal use . 187
206 D.8.3 Test of disconnection under load . 187
207 D.8.4 Overcurrent test . 188
208 D.8.5 Test of interruption of LIN communication . 188
209 D.8.6 Test of short-circuit between the control pilot conductor and the
210 protective conductor . 188
211 D.8.7 Test of options . 188
212 Annex E (informative) EV charging station designed with a standard socket-outlet –
213 Minimum gap for connection of Modes 1 and 2 cable assembly . 189
214 E.1 Overview. 189
215 E.2 General . 190
216 E.3 Minimum gap for connection of Mode 2 cables with type E/F plug and
217 socket-outlet systems . 190
218 E.4 Minimum gap for connection of Mode 2 cables with type BS1363 plug and
219 socket-outlet systems . 190
220 E.5 Minimum gap for connection of Mode 2 cables with IEC 60309-2 straight
221 plug and socket-outlet systems . 190
222 Annex F (normative)  Reverse power transfer through Mode 3 EV charging station . 193
223 F.1 General . 193
224 F.2 RPT enabling conditions . 193
225 F.3 Communication . 193
226 F.4 Grid integration requirements – grid connected RPT in grid-following
227 operation . 196
228 F.4.1 General . 196
229 F.4.2 Frequency operating range and voltage operating range . 196
230 F.4.3 Interface Protection . 197
231 F.4.4 Storage and transmission of local grid codes . 199
232 F.4.5 Functions to support dynamic network stability and steady state voltage
233 stability . 205
234 F.4.6 Grid code immunity and emission requirements . 208
235 F.4.7 Current imbalance . 210
236 F.5 Protective devices and switching devices . 210
237 F.6 Protection against overcurrent . 210
238 F.7 Installation manual . 210
239 F.8 Test of RPT enabling . 211
240 Bibliography . 212
242 Figure 1 – Case A connection . 25
243 Figure 2 – Case B connection . 25
244 Figure 3 – Case C connection . 25
245 Figure 4 – Example of coupling session including digital communication session . 41
246 Figure 5 – Reset cycle sequence . 71
247 Figure 6 – Apparatus to test the side B cable assembly anchorage . 84
IEC CDV 61851-1 © IEC 2025
248 Figure 7 – Test setup the side B cable assembly anchorage . 85
249 Figure A.1 – Electric equivalent circuit of typical control pilot circuit . 94
250 Figure A.2 – Example of circuit for high-frequency signals . 96
251 Figure A.3 – Example of state diagram at EV supply equipment . 102
252 Figure A.4 – Test A . 136
253 Figure A.5 – Test B . 136
254 Figure A.6 – Test C . 137
255 Figure A.7 – Example of a test circuit (EV simulator) for case A, B . 145
256 Figure A.8 – Example of a test circuit (EV simulator) for case C . 146
257 Figure B.1 – Equivalent circuit diagram for proximity function using a connection switch
258 and no current coding . 150
259 Figure B.2 – Equivalent circuit diagram for simultaneous proximity detection and
260 current coding . 152
261 Figure B.3 – Equivalent circuit diagram for vehicle couplers using a connection switch
262 and current coding resistor . 154
263 Figure D.1 – Typical control pilot circuit with LIN transceivers (equivalent circuit) . 159
264 Figure D.2 – State diagram at the EV supply equipment for the control pilot functions
265 defined in this Annex (informative) . 162
266 Figure D.3 – Sequence diagram of a simple example of version selection . 171
267 Figure D.4 – Sequence diagram of a simple example of initialization . 174
268 Figure D.5 – Sequence diagram of a simple example of start of operation . 177
269 Figure D.6 –Power transfer between different EV supply equipment and EVs that are
270 equipped with accessories according to IEC 62196-2 . 193
271 Figure D.7 – State diagram at the EV supply equipment for a transition from the control
272 pilot functions defined in this Annex to the control pilot functions defined in Annex A
273 (informative) . 194
274 Figure E.1 – Examples of standard plugs that are considered for this Annex E . 198
275 Figure E.2 – Packaging configurations (free volume) allowing to accommodate most
276 common plugs and socket-outlets . 200
277 Figure F.1 – Sequence diagram of BPT coupling session . 203
278 Figure F.2 – Sequence diagram : BPT as a service is temporarily interrupted for grid
279 support, due to grid frequency variation . 213
280 Figure F.3 – Sequence diagram : BPT as a service is stopped and restarted because
281 the interface protection has tripped, due to grid frequency variation . 214
283 Table 1 – Mechanical requirements and tests for Mode 3 EV charging station . 57
284 Table 2 – Requirements and tests for SPCs for OVC reduction . 63
285 Table 3 – Provisions for protection against electric shock for a Mode 3 EV charging
286 station . 68
287 Table 4 – Touch current limits . 75
288 Table 5 – Example of colour codes for status indication . 81
289 Table 6 – Pull force and torque test values for side B cable assembly anchorage . 88
290 Table 7 – Test duration for protective conductor overcurrent test . 91
291 Table A.1 – Maximum allowable high-frequency signal voltages on control pilot
292 conductor and the protective conductor . 97
293 Table A.2 – Control pilot circuit parameters and values for the EV supply equipment . 99
294 Table A.3 – Control pilot circuit parameters and values for the EV . 100
IEC CDV 61851-1 © IEC 2025
295 Table A.4 – System states detected by the EV supply equipment . 101
296 Table A.5 – State behaviour . 103
297 Table A.6 – List of sequences . 106
298 Table A.7 – PWM duty cycle provided by EV supply equipment . 125
299 Table A.8 – Maximum current to be drawn by vehicle . 125
300 Table A.9 – Test resistance values . 127
301 Table A.10 – Parameters of control pilot voltages . 131
302 Table A.11 – Test parameters of control pilot signals . 132
303 Table A.12 – Parameter for the CP states tolerance test . 133
304 Table A.13 – Parameters for sequence tests . 139
305 Table A.14 – Position of switches . 149
306 Table B.1 – Component values of proximity circuit without current coding . 153
307 Table B.2 – Current coding resistor for EV plug and vehicle connector . 155
308 Table B.3 – Values for other components of PP circuit of EV . 155
309 Table B.4 – Component value of proximity circuit with current coding . 156
310 Table D.1 – Generation and detection of CP states . 162
311 Table D.2 – Generation and detection of LIN communication levels . 163
312 Table D.3 – Key list for Figure D.2 and Figure D.7 . 165
313 Table D.4 – Control of LIN communication . 166
314 Table D.5 – Control of the switch S2 and the vehicle load . 167
315 Table D.6 – Control of the switching device . 168
316 Table D.7 – Control of latching and unlatching . 169
317 Table D.8 – Typical coupling session flow (informative) . 170
318 Table D.9 – LIN schedules and states of the EV supply equipment . 172
319 Table D.10 – Frames for AC charging . 182
320 Table D.11 – Signals for communication control . 185
321 Table D.12 – Signals for version selection . 186
322 Table D.13 – Signals for system initialization . 187
323 Table D.14 – Signals for EV status information . 191
324 Table D.15 – Signals for status of EV supply equipment . 192
325 Table D.16 – Codes for the signals SeInfoEntryX and EvInfoEntryX . 193
326 Table D.17 – Normal charge cycle test . 197
327 Table F.1 – Description of the different timestamps of Figures F.1 . 205
328 Table F.2 – List of grid code parameters sent by the Mode 3 EV charging station to the
329 EV for the service AC_DER of ISO 15118-20 AMD1 (under development) . 211
330 Table F.3 – Description of the different timestamps of Figures F.1 and F.2 . 216
IEC CDV 61851-1 © IEC 2025
333 INTERNATIONAL ELECTROTECHNICAL COMMISSION
334 ____________
336 CONDUCTIVE POWER/ENERGY TRANSFER SYSTEMS FOR ELECTRIC
337 VEHICLES –
339 Part 1: General system and specific Mode 3 EV charging station
340 requirements
342 FOREWORD
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