IEC TS 61851-3-2:2023

IEC TS 61851-3-2 ®
Edition 1.0 2023-07
TECHNICAL
SPECIFICATION
Electric vehicle conductive charging system –
Part 3-2: DC EV supply equipment where protection relies on double or
reinforced insulation – Particular requirements for portable and mobile
equipment
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IEC TS 61851-3-2 ®
Edition 1.0 2023-07
TECHNICAL
SPECIFICATION
Electric vehicle conductive charging system –

Part 3-2: DC EV supply equipment where protection relies on double or

reinforced insulation – Particular requirements for portable and mobile

equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS  43.120 ISBN 978-2-8322-7085-1

– 2 – IEC TS 61851-3-2:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions, symbols and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviated terms . 9
4 General requirements . 9
5 Classification . 10
6 Requirements for voltage converter units (VCUs) . 10
6.1 General . 10
6.2 Rated voltages and currents . 10
6.3 Requirement for AC/DC VCU for portable and mobile DRI EV supply
equipment . 10
6.4 Built-in DC/DC VCU for battery systems . 10
6.4.1 Built-in DC/DC VCU for battery systems (only AUX supply circuit) . 10
6.4.2 Built-in DC/DC VCU for removable battery systems (IEC PAS 62840-3). 11
7 Marking and instructions . 11
8 Protection against access to live parts . 11
9 Starting of motor-operated appliances . 12
10 Power input and current . 12
11 Heating . 12
12 Void . 12
13 Leakage current and electric strength at operating temperature . 12
14 Transient overvoltages . 12
15 Moisture resistance . 12
16 Leakage current and electric strength . 13
17 Overload protection of transformers and associated circuits . 13
18 Endurance . 13
19 Abnormal operation . 13
20 Stability and mechanical hazards . 13
21 Mechanical strength . 13
22 Construction . 13
23 Internal wiring . 14
24 Components . 14
25 Supply connection and external flexible cords . 14
26 Terminals for external conductors . 15
27 Provision for earthing . 15
28 Screws and connections . 15
29 Clearances, creepage distances and solid insulation . 15
30 Resistance to heat and fire . 15
31 Resistance to rusting . 16
32 Radiation, toxicity and similar hazards . 16

Annexes . 17
Annex AA (normative) Supply systems circuit diagrams . 18
AA.1 Standard supply systems circuit diagrams using NFC . 18
AA.1.1 General . 18
AA.1.2 EV supply system configuration type C, case A, accessories 4-II . 18
AA.1.3 EV supply system configuration type B, case B portable or mobile DRI
EV supply equipment, accessories 4-II . 20
AA.1.4 EV supply system configuration type D, accessories 4-II . 20
AA.2 EV supply system configuration type B, case B, coupler 4-I and 4-III . 21
AA.3 EV supply system conversion device using NFC . 22
AA.3.1 EV supply system configuration type C, case A, type 4-II, EV supply
system conversion device . 22
AA.3.2 EV supply system configuration type C, case B, accessories 4-II, EV

supply system conversion device . 22
AA.4 EV supply system conversion device configuration type B, case B, type 4-I
and 4-III . 23
Annex BB (informative) Examples of VCU wirings . 24
BB.1 AC/DC VCU for portable or mobile DRI EV supply equipment . 24
BB.2 Built-in DC/DC VCU for battery systems (only AUX supply circuit) . 25
BB.3 Built-in DC/DC VCU for removable battery systems (IEC PAS 62840-3) . 25
Annex CC (informative) Current and voltage regulation . 26
CC.1 Current and voltage regulation, AC/DC VCU . 26
CC.2 Current and voltage regulation, DC/DC VCU . 27
CC.3 Current and voltage regulation, DC/DC VCU for removable battery systems . 29
Annex DD (normative) Applicable requirements and tests of IEC 60335-2-29 . 31
Bibliography . 35

Figure AA.1 – EV supply system configuration type C, case A, accessories 4-II . 19
Figure AA.2 – EV supply system configuration type B, case B portable or mobile DRI
EV supply equipment, accessories 4-II . 20
Figure AA.3 – EV supply system configuration type D, accessories 4-II . 21
Figure AA.4 – EV supply system configuration type B, case B, coupler 4-I and 4-III . 21
Figure AA.5 – EV supply system configuration type C, case A, accessories 4-II, EV

supply system conversion device . 22
Figure AA.6 – EV supply system configuration type C, case B, accessories 4-II,
manufacturer device . 22
Figure AA.7 – EV supply system conversion device configuration type B, case B, 4-I
and 4-III . 23
Figure BB.1 – AC/DC VCU for portable and mobile DRI EV supply equipment, +60 V or

–120 V output . 24
Figure BB.2 – Built-in DC/DC VCU: battery system (generation of internal AUX supply
circuit) . 25
Figure BB.3 – Built-in DC/DC VCU for removable battery systems (IEC PAS 62840-3) . 25
Figure CC.1 – Current and voltage regulation, AC/DC VCU . 27
Figure CC.2 – Current and voltage regulation, DC/DC VCU . 29
Figure CC.3 – Current and voltage regulation, DC/DC VCU for removable battery
systems . 30

Table DD.1 – Applicable requirements and tests according to IEC 60335-2-29 . 31

– 4 – IEC TS 61851-3-2:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –

Part 3-2: DC EV supply equipment where protection relies
on double or reinforced insulation – Particular requirements
for portable and mobile equipment

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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