IEC TS 61851-3-2:2023

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

IEC TS 61851-3-2:2023 This part of IEC 61851, which is a Technical Specification, applies to the portable and mobile DRI EV supply equipment where the protection against electric shocks relies on double or reinforced insulation, and with double or reinforced insulation between all AC and DC inputs and outputs with a rated input voltage being not more than 250 V AC and output voltages not more than 120 V DC.

General Information

• Status: Published
• Publication Date: 17-Jul-2023
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 69 - Electrical power/energy transfer systems for electrically propelled road vehicles and industrial trucks
• Drafting Committee: WG 10 - TC 69/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 05-Jul-2023
• Completion Date: 18-Jul-2023

Standards Content (Sample)

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

IEC TS 61851-3-2:2023-07(en)

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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




  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 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

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IEC TS 61851-3-2:2023 © IEC 2023 – 3 –
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

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– 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
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC TS 61851-3-2 has been prepared by IEC technical committee 69: Electrical power/energy
transfer systems for electrically road vehicles and industrial trucks. It is a Technical
Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
69/846/DTS 69/883/RVDTS

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.

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IEC TS 61851-3-2:2023 © IEC 2023 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This part is to be used in conjunction with IEC 60335-2-29:2016 and IEC 60335-1:2020.
The clauses of the particular requirements in this document supplement or modify the
corresponding clauses of IEC 60335-2-29:2016 and IEC 60335-1:2020. Where the text
indicates an "addition" to or a "replacement" of the relevant requirement, test specification or
explanation of IEC 60335-2-29:2016 and IEC 60335-1:2020, these changes are made to the
relevant text of IEC 60335-2-29:2016 and IEC 60335-1:2020, which then becomes part of this
document. Where no change is necessary, the words "The xxx of portable and mobile DRI EV
supply equipment shall be in accordance with the relevant requirements (for class II appliances
or heating appliances) of IEC 60335-2-29:2016" are used, where "xxx" represents the relevant
title of the clause referred to. See also Annex DD. Additional annexes are lettered AA, BB, CC
and DD.
In this document, the following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
A list of all parts in the IEC 61851 all parts, published under the general title Electric vehicles
conductive charging system, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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– 6 – IEC TS 61851-3-2:2023 © IEC 2023
INTRODUCTION
This document is published in separate parts according to the following structure:
IEC TS 61851-3-1, Electric vehicle conductive charging system – Part 3-1: DC EV supply
equipment where protection relies on double or reinforced insulation – General rules and
requirements for stationary equipment
IEC TS 61851-3-2, 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
IEC TS 61851-3-4, Electric vehicle conductive charging system – Part 3-4: DC EV supply
equipment where protection relies on double or reinforced insulation – General definitions and
requirements for CANopen communication
IEC TS 61851-3-5, Electric vehicle conductive charging system – Part 3-5: DC EV supply
equipment where protection relies on double or reinforced insulation – Pre-defined
communication parameters and general application objects
IEC TS 61851-3-6, Electric vehicle conductive charging system – Part 3-6: DC EV supply
equipment where protection relies on double or reinforced insulation – Voltage converter unit
communication
IEC TS 61851-3-7, Electric vehicle conductive charging system – Part 3-7: DC EV supply
equipment where protection relies on double or reinforced insulation – Battery system
communication

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IEC TS 61851-3-2:2023 © IEC 2023 – 7 –
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



1 Scope
This part of IEC 61851, which is a Technical Specification, applies to the portable and mobile
DRI EV supply equipment where the protection against electric shocks relies on double or
reinforced insulation, and with double or reinforced insulation between all AC and DC inputs
and outputs with a rated input voltage being not more than 250 V AC and output voltages not
more than 120 V DC.
NOTE 1 In the following countries, the acceptable nominal supply voltage is up to 600 V AC: CA, US.
NOTE 2 These specified rated input and output voltages supersede all references.
This document applies to
• VCUs intended to be a part of portable and mobile DRI EV supply equipment,
• portable and mobile DRI EV supply equipment according to the IEC 61851-3 series intended
to be installed and/or used at an altitude of up to 2 000 m, and
• portable and mobile DRI EV supply equipment for the conductive transfer of electric power
between the supply network and an electric road vehicle/RESS according to the
IEC 61851-3 series intended to be connected to vehicles where the vehicle power supply
circuit is protected against electric shock by double or reinforced insulation.
NOTE 3 For information regarding protection against electric shock by double or reinforced insulation of the EV or
of the vehicle power supply circuit, see ISO 18246:2023, 6.1.1 b) and Table 3.
The aspects covered in this document include
• the characteristics and operating conditions of the portable and mobile DRI EV supply
equipment,
• the specification for required level of electrical safety for the portable and mobile DRI EV
supply equipment,
• requirements for bidirectional power transfer from DC to DC, and
• requirements for command and control basic communication for safety and process matters,
if required.
This document does not apply to
• safety aspects related to maintenance, and
• electrical devices and components, which are covered by their specific product standards.

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– 8 – IEC TS 61851-3-2:2023 © IEC 2023
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60038, IEC standard voltages
IEC 60335-1:2020, Household and similar electrical appliances – Safety – Part 1: General
requirements
IEC 60335-2-29:2016, Household and similar electrical appliances – Safety – Part 2-29:
Particular requirements for battery chargers
IEC 60335-2-29:2016/AMD1:2019
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC TS 61851-3-1:2023, Electric vehicle conductive charging system – Part 3-1: DC EV supply
equipment where protection relies on double or reinforced insulation – General rules and
requirements for stationary equipment
IEC TS 62196-4:2022, Plugs, socket-outlets, vehicle connectors and vehicles inlets –
Conductive charging of electric vehicles – Part 4: Dimensional compatibility and
interchangeability requirements for DC pin and contact-tube accessories for class II or class III
applications
CiA 454-12, CANopen application profile for energy management systems – Part 12: Gateway
1
unit, available at www.can-cia.org
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61851-3-1:2023
apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
protective impedance
impedance connected between live parts and accessible conductive parts of class II
constructions so that the current, in normal use and under likely fault conditions in the
appliance, is limited to a safe value
[SOURCE: IEC 60335-1:2020, 3.3.6]
___________
1
Under preparation.

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IEC TS 61851-3-2:2023 © IEC 2023 – 9 –
3.2 Symbols and abbreviated terms
AC alternating current
DC direct current
EMS energy management system
EMSC energy management system controller
IMD insulation monitoring device
EV electric vehicle
NFC near field communication
VCU voltage converter unit

4 General requirements
Portable and mobile DRI EV supply equipment shall be constructed so that, in normal use, they
function safely so as to cause no danger to persons or surroundings, even in the event of
carelessness that may occur in normal use.
Compliance is checked by meeting all of the relevant requirements of this document.
Annex DD provides references to applicable requirements and tests to the relevant clauses of
IEC 60335-2-29:2016.
The portable and mobile DRI EV supply equipment may have one or more "connecting points"
according to IEC 60364-7-722:2018 that are used for energy supply to electric vehicle. This
includes socket-outlets (case A or case B) and/or cord sets attached with vehicle connectors
(case C). Each connecting point shall have its own dedicated protection means.
Each connecting point shall be supplied by its own safety isolating transformer according to
IEC TS 61851-3-1:2023, 7.1.1.
Measures for fault protection are specified in IEC TS 61851-3-1:2023, 9.3.
Unless otherwise specified, the tests are carried out in accordance with Clause 5.
Unless otherwise specified, all tests indicated in this document are type tests.
NOTE 1 Routine tests are carried out for portable and mobile DRI EV supply equipment, according to
IEC 60335-1:2020, Annex A.
Unless otherwise specified, all tests shall be carried out in the order of the clauses and
subclauses in this document.
The tests of IEC 60335-2-29:2016, Clause 5, are carried out on one sample (portable and
mobile DRI EV supply equipment) that shall withstand all the relevant tests.
The DRI EV supply equipment shall be rated for one or a range of standard nominal voltages
as given in IEC 60038.
For the purpose of portable and mobile DRI EV supply equipment, IEC TS 61851-3-1:2023,
Clause 7 and Clause 8, apply.
NOTE 2 IEC TS 61851-3-1:2023, Figure 1, shows EV supply system configuration type A, B and D covering portable
and mobile DRI EV supply equipment.

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– 10 – IEC TS 61851-3-2:2023 © IEC 2023
Compliance is tested according to IEC TS 61851-3-1:2023, Clause 7 and Clause 8.
5 Classification
For the purposes of this document, the classifications as given in IEC TS 61851-3-1:2023 apply.
6 Requirements for voltage converter units (VCUs)
6.1 General
Clause 6 covers requirements for VCUs for AC/DC or DC/DC conversion of electric power used
within the DRI EV supply equipment.
6.2 Rated voltages and currents
Standard ratings of voltages and currents shall be in accordance with IEC TS 61851-3-1:2023,
7.2.
Compliance shall be verified by inspection.
NOTE Current and voltage regulation is shown in Annex CC.
6.3 Requirement for AC/DC VCU for portable and mobile DRI EV supply equipment
The AC/DC VCU for portable and mobile DRI EV supply equipment provides AC input voltage
(side A) according to IEC TS 61851-3-1:2023, Table 2, and DC output voltages (side B)
according to IEC TS 61851-3-1:2023, Table 3.
AC/DC VCUs for portable and mobile DRI EV supply equipment provides AUX voltage for AUX
supply circuit at side B.
AC/DC VCUs for portable and mobile DRI EV supply equipment intended for maximum output
voltage of +60 V DC to the DC power circuits on side B by the following connection:
• DC +60 V;
• DC 0 V.
AC/DC VCUs for portable and mobile DRI EV supply equipment intended for maximum output
voltage of –120 V DC to the DC power circuits on side B by the following connection:
• DC 0 V;
• DC –120 V.
NOTE Example for wiring and insulation of AC/DC VCU for portable and mobile DRI EV supply equipment is shown
in Figure BB.1.
6.4 Built-in
...