Electrically propelled road vehicles — Safety specifications — Part 3: Electrical safety

This document specifies electrical safety requirements for voltage class B electric circuits of electric propulsion systems and conductively connected auxiliary electric systems of electrically propelled road vehicles. It specifies electrical safety requirements for protection of persons against electric shock and thermal incidents. It does not provide comprehensive safety information for manufacturing, maintenance and repair personnel. NOTE 1 Electrical safety requirements for post-crash are described in ISO 6469-4. NOTE 2 Electrical safety requirements for conductive connections of electrically propelled road vehicles to an external electric power supply are described in ISO 17409. NOTE 3 Specific electrical safety requirements for magnetic field wireless power transfer between an external electric power supply and an electrically propelled vehicle are described in ISO 19363. NOTE 4 Electrical safety requirements for motorcycles and mopeds are described in the ISO 13063 series.

Véhicules routiers électriques — Spécifications de sécurité — Partie 3: Sécurité électrique

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Publication Date
27-Oct-2021
Current Stage
6060 - International Standard published
Start Date
28-Oct-2021
Completion Date
28-Oct-2021
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INTERNATIONAL ISO
STANDARD 6469-3
Fourth edition
2021-10
Electrically propelled road vehicles —
Safety specifications —
Part 3:
Electrical safety
Véhicules routiers électriques — Spécifications de sécurité —
Partie 3: Sécurité électrique
Reference number
ISO 6469-3:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 6469-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6469-3:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Voltage classes ........................................................................................................................................................................................................6

5 General requirements .................................................................................................................................................................................... 6

5.1 Environmental and operational requirements.......................................................................................................... 6

5.2 Marking ......................................................................................................................................................................................................... 7

5.2.1 Marking of voltage class B electric components .................................................................................... 7

5.2.2 Marking of voltage class B wiring ....................................................................................................................... 7

6 Requirements for protection of persons against electric shock....................................................................... 7

6.1 General requirements ...................................................................................................................................................................... 7

6.1.1 General requirements for connected sections of a circuit ............................................................ 7

6.1.2 General requirements for voltage class B1 ................................................................................................. 7

6.1.3 General requirements for voltage class B2 ................................................................................................. 8

6.2 Basic protection ..................................................................................................................................................................................... 8

6.3 Fault protection and additional measures ..................................................................................................................... 8

6.3.1 Equipotential bonding ................................................................................................................................................... 8

6.3.2 Isolation resistance .......................................................................................................................................................... 9

6.3.3 Provisions for capacitive coupling and capacitive discharge .................................................. 10

6.3.4 De-energization ................................................................................................................................................................ 11

6.3.5 Alternative protection measures ..................................................................................................................... 11

6.4 General requirements for protective provisions ..................................................................................................12

6.4.1 General .....................................................................................................................................................................................12

6.4.2 Requirements for insulation .................................................................................................................................12

6.4.3 Requirements for protective barriers and protective enclosures ......................................12

6.4.4 Requirements for connectors .............................................................................................................................. 13

6.4.5 Insulation coordination............................................................................................................................................. 13

6.5 Alternative approach for protection against electric shock .......................................................................13

7 Protection against thermal incidents ........................................................................................................................................13

7.1 Overload protection ........................................................................................................................................................................ 13

7.2 Short-circuit protection ........................................................................................................................................... ....................13

8 Requirements for vehicle power supply circuit ...............................................................................................................14

9 Owner's manual .................................................................................................................................................................................................14

10 Test procedures .................................................................................................................................................................................................14

10.1 General ........................................................................................................................................................................................................ 14

10.2 Continuity test for equipotential bonding .................................................................................................................. 14

10.3 Isolation resistance measurements for voltage class B2 electric circuits ..................................... 14

10.3.1 Preconditioning and conditioning ................................................................................................................... 14

10.3.2 Isolation resistance measurements of the balance of electric circuits...........................15

10.3.3 Isolation resistance measurement of the voltage class B2 electric power

sources .....................................................................................................................................................................................15

10.3.4 Isolation resistance measurement of entire electric circuits.................................................. 18

10.4 Test for isolation resistance monitoring system ................................................................................................... 18

10.5 Touch current........................................................................................................................................................................................ 18

10.6 Withstand voltage test ................................................................................................................................................................. 19

10.6.1 General ..................................................................................................................................................................................... 19

10.6.2 Preconditioning and conditioning ................................................................................................................... 19

10.6.3 Test procedure................................................................................................................................................................... 19

10.6.4 Test criteria .......................................................................................................................................................................... 20

10.7 Withstand voltage test for electric power sources which are not de-energized ......................20

iii
© ISO 2021 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 6469-3:2021(E)

10.7.1 General .....................................................................................................................................................................................20

10.7.2 Preconditioning and conditioning ................................................................................................................... 21

10.7.3 Test .................. .................................................... ......................................................................................................................... 21

10.7.4 Test criteria .......................................................................................................................................................................... 23

Bibliography .............................................................................................................................................................................................................................24

© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 6469-3:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 22 Road vehicles, Subcommittee SC 37,

Electrically propelled vehicles.

This fourth edition cancels and replaces the third edition (ISO 6469-3:2018), which has been technically

revised. It also incorporates the Amendment ISO 6469-3:2018/Amd.1:2020.
The main changes are as follows:
— changes from ISO 6469-3:2018/Amd.1:2020 were implemented,
— requirements for equipotential bonding were revised.
A list of all parts in the ISO 6469 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 6469-3:2021(E)
Electrically propelled road vehicles — Safety
specifications —
Part 3:
Electrical safety
1 Scope

This document specifies electrical safety requirements for voltage class B electric circuits of electric

propulsion systems and conductively connected auxiliary electric systems of electrically propelled

road vehicles.

It specifies electrical safety requirements for protection of persons against electric shock and thermal

incidents.

It does not provide comprehensive safety information for manufacturing, maintenance and repair

personnel.

NOTE 1 Electrical safety requirements for post-crash are described in ISO 6469-4.

NOTE 2 Electrical safety requirements for conductive connections of electrically propelled road vehicles to an

external electric power supply are described in ISO 17409.

NOTE 3 Specific electrical safety requirements for magnetic field wireless power transfer between an external

electric power supply and an electrically propelled vehicle are described in ISO 19363.

NOTE 4 Electrical safety requirements for motorcycles and mopeds are described in the ISO 13063 series.

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.

ISO 17409, Electrically propelled road vehicles — Conductive power transfer — Safety requirements

ISO 20653, Road vehicles — Degrees of protection (IP code) — Protection of electrical equipment against

foreign objects, water and access

IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems

IEC 60990:2016, Methods of measurement of touch current and protective conductor current

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
© ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 6469-3:2021(E)
3.1
auxiliary electric system

vehicle system, other than the propulsion system, that operates on electric energy

3.2
balance of electric circuit

remaining section of an electric circuit when all electric power sources (3.37) that are energized (3.16)

[e.g. RESS (3.31) and fuel cell stacks (3.20)] are disconnected
3.3
basic insulation
insulation of hazardous live parts (3.22) which provides basic protection (3.4)

Note 1 to entry: This concept does not apply to insulation used exclusively for functional purposes.

Note 2 to entry: Where insulation is not provided by solid insulation only, it is complemented with protective

barriers (3.29) or protective enclosures (3.30) to prevent access to live parts in order to achieve basic protection.

[SOURCE: IEC 60050-195:2021, 195-06-06, modified — The phrase “hazardous live parts” and Note 2 to

entry were added.]
3.4
basic protection
protection against electric shock (3.14) under fault-free conditions

[SOURCE: IEC 60050-195:2021, 195-06-01, modified — The phrase “fault-free conditions” replaces

“normal conditions”.]
3.5
clearance
shortest distance in air between two conductive parts (3.6)
[SOURCE: IEC 60050-581:2008, 581-27-76]
3.6
conductive part
part which can carry electric current
[SOURCE: IEC 60050-195:2021, 195-01-06]
3.7
conductively connected
not separated by at least a provision for basic protection (3.4)
3.8
creepage distance

shortest distance along the surface of a solid insulating material between two conductive parts (3.6)

[SOURCE: IEC 60050-151:2001/Amd.1:2013, 151-15-50]
3.9
degree of protection

protection provided by an enclosure or barriers against access, foreign objects and/or water and

verified by standardized test methods in accordance with ISO 20653

[SOURCE: ISO 20653:2013, 3.2, modified — The phrases “or barriers” and “in accordance with

ISO 20653”, and the term IP were added.]
© ISO 2021 – All rights reserved
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ISO 6469-3:2021(E)
3.10
direct contact
electric contact of persons or animals with live parts (3.25)

[SOURCE: IEC 60050-195:2021, 195-06-03, modified — “persons” replaces “human beings” and

“animals” replaces “livestock”.]
3.11
double insulation

insulation comprising both basic insulation (3.3) and supplementary insulation (3.33)

[SOURCE: IEC 60050-195:2021, 195-06-08]
3.12
electric chassis

conductive parts (3.6) of a vehicle that are electrically connected and whose potential is taken as

reference
3.13
electric drive

combination of traction motor, power electronics and their associated controls for the conversion of

electric to mechanical power and vice versa
3.14
electric shock

physiological effect resulting from an electric current through a human body or animal body

[SOURCE: IEC 60050-195:2021, 195-01-04, modified —“animal body” replaces “livestock”.]

3.15
electrically propelled vehicle
vehicle with one or more electric drive(s) (3.13) for vehicle propulsion
3.16
energized
live

at an electric potential different from that of electric chassis (3.12) at the worksite and which presents

an electrical hazard

Note 1 to entry: A part is energized when it is electrically connected to a source of electric energy. It can also be

energized when it is electrically charged and/or under the influence of an electric or magnetic field.

[SOURCE: IEC 60050-651:2014, 651-21-08, modified — “electric chassis” replaces “earth” and the Note

2 to entry was deleted.]
3.17
equipotential bonding

provision of electric connections between conductive parts (3.6), intended to achieve equipotentiality

[SOURCE: IEC 60050-195:2021, 195-01-10, modified — “provision” replaces “set”.]
3.18
exposed conductive part

conductive part (3.6) of equipment which can be touched and which is not normally live, but which can

become live when basic insulation (3.3) fails

Note 1 to entry: A conductive part of electrical equipment which can become live only through contact with an

exposed conductive part which has become live, is not considered to be an exposed conductive part itself.

[SOURCE: IEC 60050-442:1998, 442-01-21, modified — “equipment” replaces “electric equipment”.]

© ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 6469-3:2021(E)
3.19
fault protection
protection against electric shock (3.14) under single-fault conditions
[SOURCE: IEC 60050-195:2021, 195-06-02]
3.20
fuel cell stack
assembly of two or more fuel cells that are electrically connected
3.21
fuel cell system

system, typically containing the following subsystems: fuel cell stack (3.20), air processing, fuel

processing, thermal management, water management, and their control
3.22
hazardous live part

live part (3.25) which, under certain conditions, can give a harmful electric shock (3.14)

Note 1 to entry: For guidance on harmful physiological effects see IEC 61140.

[SOURCE: IEC 60050-195:2021, 195-06-05, modified — Term changed from “hazardous-live-part” to

“hazardous live part” and Note 1 to entry was added.]
3.23
isolation resistance
insulation resistance

resistance between live parts (3.25) of an electric circuit and the electric chassis (3.12) as well as other

electric circuits which are insulated from this electric circuit
3.24
isolation resistance monitoring system

system that periodically or continuously monitors the isolation resistance (3.23) between live parts

(3.25) and the electric chassis (3.12)
3.25
live part

conductor or conductive part (3.6) intended to be energized (3.16) in normal use, but by convention not

the electric chassis (3.12)
3.26
maximum working voltage

highest value of AC voltage (rms) or of DC voltage that can occur under any normal operating conditions

according to the manufacturer's specifications, disregarding transients and ripple

3.27
overload protection
protection intended to operate in the event of overload on the protected section
[SOURCE: IEC 60050-448:1995, 448-14-31]
3.28
overcurrent protection

protection intended to operate when the current is in excess of a predetermined value

[SOURCE: IEC 60050-448:1995, 448-14-26]
© ISO 2021 – All rights reserved
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ISO 6469-3:2021(E)
3.29
protective barrier

part providing protection against direct contact (3.10) from any usual direction of access

[SOURCE: IEC 60050-195:2021, 195-06-15, modified — “against direct contact” replaces “against

contact by a human being or livestock with hazardous-live-parts” .]
3.30
protective enclosure

electrical enclosure surrounding internal parts of equipment to prevent access to hazardous live parts

(3.22) from any direction
[SOURCE: IEC 60050-195:2021, 195-06-14]
3.31
RESS
rechargeable energy storage system

rechargeable system that stores energy for delivery of electric energy for the electric drive (3.13)

EXAMPLE Battery, capacitor, flywheel.
3.32
reinforced insulation

insulation of hazardous live parts (3.22) which provides protection against electric shock (3.14)

equivalent to double insulation (3.11)

Note 1 to entry: Reinforced insulation may comprise several layers that cannot be tested singly as basic insulation

(3.3) or supplementary insulation (3.33).
[SOURCE: IEC 60050-581:2008, 581-21-27]
3.33
supplementary insulation

independent insulation applied in addition to basic insulation (3.3), for fault protection (3.19)

[SOURCE: IEC 60050-195:2021, 195-06-07]
3.34
touch current

electric current passing through a human body or through livestock when it touches one or more

accessible parts of cables or equipment
[SOURCE: ISO 17409:2020, 3.57, modified — “cables” replaces “an installation”.]
3.35
vehicle power supply circuit

voltage class (3.36) B electric circuit which includes all parts that are conductively connected (3.7) to

the vehicle inlet (case B, case C) or the plug (case A) or part of an autoconnect charging device that

is mounted on the electrically propelled vehicle (3.15) (case D, case E) and that is operational when

connected to an external electric power supply
Note 1 to entry: Case A, case B, case C are defined in IEC 61851-1.

Note 2 to entry: Case D, case E and autoconnect charging device are defined in IEC 61851-23–1 .

[SOURCE: ISO 17409:2020, 3.61, modified — Note 1 to entry replaced and Note 2 to entry added.]

3.36
voltage class

classification of an electric component or circuit according to its maximum working voltage (3.26)

1) Under preparation. Stage at the time of publication: IEC/PRVC 61851-23-1:2021.

© ISO 2021 – All rights reserved
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ISO 6469-3:2021(E)
3.37
electric power source
system that provides electric energy
EXAMPLE RESS (3.31), fuel cell system (3.21), photovoltaic system.
4 Voltage classes

Depending on its maximum working voltage U, an electric circuit, a section of a circuit or an electric

component belongs to the voltage classes specified in Table 1.
Table 1 — Voltage classes
Maximum working voltage
Voltage class
DC in V AC in V (rms value)
A 0 < U ≤ 60 0 < U ≤ 30
B 60 < U ≤ 1 500 30 < U ≤ 1 000
B1 60 < U ≤ 75 30 < U ≤ 50
B2 75 < U ≤ 1 500 50 < U ≤ 1 000

The voltage classes B1 and B2 are subclasses of voltage class B. Due to the different voltage levels,

different requirements are specified for voltage class B1 and voltage class B2, whereas the requirements

for voltage class B2 are more stringent. The requirements for voltage class B2 may be applied for the

complete range of voltage class B, including the voltage range of voltage class B1. It is allowed to use

voltage class B instead of voltage class B1 and voltage class B2.

In cases where voltage class B is referenced by another standard, the requirements for voltage class B2

apply.

NOTE 1 Dividing voltage class B into two voltage classes B1 and B2 allows chassis-connected voltage class

B1 drivetrain and connected electrical systems in electric vehicles according to the given scope. Otherwise,

all circuits which contain AC sections with a maximum working voltage between 30 V AC and 50 V AC, and DC

sections with a maximum working voltage up to 60 V DC, would have to be insulated from the chassis, only

because the AC part of the circuit falls into voltage class B range, whereas it would be possible for the DC part to

still fall under the regulations for a voltage class A circuit.

NOTE 2 If the requirements of voltage class B1 are fulfilled, the maximum working voltage of an electric

circuit, a section of a circuit or an electric component can be up to 75 V DC and up to 50 V AC.

NOTE 3 The requirements for voltage class B1 are based on IEC 61140, IEC 60479-1, IEC 60479-2, IEC 60479-5,

and IEC 60364-4–41.

NOTE 4 The voltage limits of voltage class B1 are harmonized with the European Low Voltage Directive and

IEC 61140 (the AC limit). Electric vehicles are not in the scope of the European Low Voltage Directive.

5 General requirements
5.1 Environmental and operational requirements

The requirements given in this document shall be met across the range of environmental and

operational conditions for which the electrically propelled vehicle is designed to operate, as specified

by the vehicle manufacturer.

NOTE See the ISO 16750 series, ISO 21498-1 and the ISO 19453 series for guidance.

© ISO 2021 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 6469-3:2021(E)
5.2 Marking
5.2.1 Marking of voltage class B electric components

The symbol ISO 7010–W012 in Figure 1 shall be visible on protective barriers and protective enclosures,

which, when removed, expose hazardous live parts of voltage class B electric circuits. Accessibility and

removability of protective barriers and protective enclosures should be considered when evaluating

the requirement for the symbol.

The symbol may be embossed or engraved in accordance with Figure 1. In this case colour is not

required.

For a protective enclosure consisting of several parts, one symbol is sufficient when visibility of the

symbol is given.
Figure 1 — ISO 7010-W012 - Warning; Electricity
5.2.2 Marking of voltage class B wiring

The outer covering of cables and harness for voltage class B2 electric circuits not within protective

enclosures or behind protective barriers shall be marked with orange colour. Voltage class B1 cables

and harness shall be marked with a two-colour combination of orange and purple or with orange colour.

In case of the two-colour combination, each colour shall cover at least 30 % of the surface. The marking

shall be visible over the whole cable length and from all usual directions of access.

Voltage class B connectors may be identified by the harnesses to which the connector is attached.

NOTE Specifications of the orange colour are given, for example, in standards in the US (8.75R5.75/12.5)

and in Japan (8.8R5.8/12.5) according to the Munsell colour system.
6 Requirements for protection of persons against electric shock
6.1 General requirements
6.1.1 General requirements for connected sections of a circuit

If not specified otherwise, an electric circuit consisting of conductively connected sections with

different maximum working voltages shall be classified according to the highest maximum working

voltage.
6.1.2 General requirements for voltage class B1
Protection against electric shock for voltage class B1 shall be comprising:
— limitation of voltage in accordance with Table 1 under normal conditions;
— provisions for basic protection according to 6.2; and
— additional measures according to 6.3.1 and 6.3.3.
© ISO 2021 – All rights reserved
---------------------- Page: 12 ----------------------
ISO 6469-3:2021(E)

The electric chassis may be used as a conductor for the DC sections of a voltage class B1 electric circuit.

The electric chassis shall not be used as a conductor for the AC sections of a voltage class B

...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6469-3
ISO/TC 22/SC 37
Electrically propelled road vehicles —
Secretariat: DIN
Safety specifications —
Voting begins on:
2021-08-04
Part 3:
Voting terminates on:
Electrical safety
2021-09-29
Véhicules routiers électriques — Spécifications de sécurité —
Partie 3: Sécurité électrique
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6469-3:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 6469-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 6469-3:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Voltage classes ........................................................................................................................................................................................................ 6

5 General requirements ..................................................................................................................................................................................... 6

5.1 Environmental and operational requirements ........................................................................................................... 6

5.2 Marking ......................................................................................................................................................................................................... 7

5.2.1 Marking of voltage class B electric components................................................................................... 7

5.2.2 Marking of voltage class B wiring ..................................................................................................................... 7

6 Requirements for protection of persons against electric shock ......................................................................... 7

6.1 General requirements ....................................................................................................................................................................... 7

6.1.1 General requirements for connected sections of a circuit ........................................................... 7

6.1.2 General requirements for voltage class B1 ............................................................................................... 7

6.1.3 General requirements for voltage class B2 ............................................................................................... 8

6.2 Basic protection ..................................................................................................................................................................................... 8

6.3 Fault protection and additional measures ...................................................................................................................... 8

6.3.1 Equipotential bonding ................................................................................................................................................ 8

6.3.2 Isolation resistance ........................................................................................................................................................ 9

6.3.3 Provisions for capacitive coupling and capacitive discharge .................................................10

6.3.4 De-energization .............................................................................................................................................................11

6.3.5 Alternative protection measures ....................................................................................................................11

6.4 General requirements for protective provisions ....................................................................................................12

6.4.1 General...................................................................................................................................................................................12

6.4.2 Requirements for insulation ...............................................................................................................................12

6.4.3 Requirements for protective barriers and protective enclosures ......................................12

6.4.4 Requirements for connectors ............................................................................................................................13

6.4.5 Insulation coordination ..........................................................................................................................................13

6.5 Alternative approach for protection against electric shock ..........................................................................13

7 Protection against thermal incidents ..........................................................................................................................................13

7.1 Overload protection .........................................................................................................................................................................13

7.2 Short-circuit protection ................................................................................................................................................................13

8 Requirements for vehicle power supply circuit ................................................................................................................14

9 Owner's manual .................................................................................................................................................................................................14

10 Test procedures ..................................................................................................................................................................................................14

10.1 General ........................................................................................................................................................................................................14

10.2 Continuity test for equipotential bonding ....................................................................................................................14

10.3 Isolation resistance measurements for voltage class B2 electric circuits .........................................14

10.3.1 Preconditioning and conditioning .................................................................................................................14

10.3.2 Isolation resistance measurements of the balance of electric circuits ..........................15

10.3.3 Isolation resistance measurement of the voltage class B2 electric power

sources ...................................................................................................................................................................................15

10.3.4 Isolation resistance measurement of entire electric circuits .................................................18

10.4 Test for isolation resistance monitoring system .....................................................................................................18

10.5 Touch current ........................................................................................................................................................................................18

10.6 Withstand voltage test ...................................................................................................................................................................19

10.6.1 General...................................................................................................................................................................................19

10.6.2 Preconditioning and conditioning .................................................................................................................19

10.6.3 Test procedure ................................................................................................................................................................19

10.6.4 Test criteria ........................................................................................................................................................................20

10.7 Withstand voltage test for electric power sources which are not de-energized .........................20

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 6469-3:2021(E)

10.7.1 General...................................................................................................................................................................................20

10.7.2 Preconditioning and conditioning .................................................................................................................21

10.7.3 Test ............................................................................................................................................................................................21

10.7.4 Test criteria ........................................................................................................................................................................23

Bibliography .............................................................................................................................................................................................................................24

iv © ISO 2021 – All rights reserved
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ISO/FDIS 6469-3:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www. iso. org/d irectives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www. iso. org/p atents).

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expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www. iso. org/

iso/f oreword. html.

This document was prepared by Technical Committee ISO/TC 22 Road vehicles, Subcommittee SC 37,

Electrically propelled vehicles.

This fourth edition cancels and replaces the third edition (ISO 6469-3:2018), which has been technically

revised. It also incorporates the Amendment ISO 6469-3:2018/Amd.1:2020. The main changes compared

to the previous edition are as follows:
— changes from ISO 6469-3:2018/Amd.1:2020 were implemented,
— requirements for equipotential bonding were revised.
A list of all parts in the ISO 6469 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www. iso. org/m embers. html.
© ISO 2021 – All rights reserved v
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6469-3:2021(E)
Electrically propelled road vehicles — Safety
specifications —
Part 3:
Electrical safety
1 Scope

This document specifies electrical safety requirements for voltage class B electric circuits of electric

propulsion systems and conductively connected auxiliary electric systems of electrically propelled

road vehicles.

It specifies electrical safety requirements for protection of persons against electric shock and thermal

incidents.

It does not provide comprehensive safety information for manufacturing, maintenance and repair

personnel.

NOTE 1 Electrical safety requirements for post-crash are described in ISO 6469-4.

NOTE 2 Electrical safety requirements for conductive connections of electrically propelled road vehicles to an

external electric power supply are described in ISO 17409.

NOTE 3 Specific electrical safety requirements for magnetic field wireless power transfer between an external

electric power supply and an electrically propelled vehicle are described in ISO 19363.

NOTE 4 Electrical safety requirements for motorcycles and mopeds are described in the ISO 13063 series.

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.

ISO 17409, Electrically propelled road vehicles — Conductive power transfer — Safety requirements

ISO 20653, Road vehicles — Degrees of protection (IP code) — Protection of electrical equipment against

foreign objects, water and access

IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems

IEC 60990:2016, Methods of measurement of touch current and protective conductor current

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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ISO/FDIS 6469-3:2021(E)
3.1
auxiliary electric system

vehicle system, other than the propulsion system, that operates on electric energy

3.2
balance of electric circuit

remaining section of an electric circuit when all electric power sources (3.37) that are energized (3.16)

[e.g. RESS (3.31) and fuel cell stacks (3.20)] are disconnected
3.3
basic insulation
insulation of hazardous live parts (3.22) which provides basic protection (3.4)

Note 1 to entry: This concept does not apply to insulation used exclusively for functional purposes.

Note 2 to entry: Where insulation is not provided by solid insulation only, it is complemented with protective

barriers (3.29) or protective enclosures (3.30) to prevent access to live parts in order to achieve basic protection.

[SOURCE: IEC 60050-195:2021, 195-06-06, modified — The phrase “hazardous live parts” and Note 2 to

entry were added.]
3.4
basic protection
protection against electric shock (3.14) under fault-free conditions

[SOURCE: IEC 60050-195:2021, 195-06-01, modified — The phrase “fault-free conditions” replaces

“normal conditions”.]
3.5
clearance
shortest distance in air between two conductive parts (3.6)
[SOURCE: IEC 60050-581:2008, 581-27-76]
3.6
conductive part
part which can carry electric current
[SOURCE: IEC 60050-195:2021, 195-01-06]
3.7
conductively connected
not separated by at least a provision for basic protection (3.4)
3.8
creepage distance

shortest distance along the surface of a solid insulating material between two conductive parts (3.6)

[SOURCE: IEC 60050-151:2001/Amd.1:2013, 151-15-50]
3.9
degree of protection

protection provided by an enclosure or barriers against access, foreign objects and/or water and

verified by standardized test methods in accordance with ISO 20653

[SOURCE: ISO 20653:2013, 3.2, modified — The phrases “or barriers” and “in accordance with

ISO 20653”, and the term IP were added.]
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ISO/FDIS 6469-3:2021(E)
3.10
direct contact
electric contact of persons or animals with live parts (3.25)

[SOURCE: IEC 60050-195:2021, 195-06-03, modified — “persons” replaces “human beings” and

“animals” replaces “livestock”.]
3.11
double insulation

insulation comprising both basic insulation (3.3) and supplementary insulation (3.33)

[SOURCE: IEC 60050-195:2021, 195-06-08]
3.12
electric chassis

conductive parts (3.6) of a vehicle that are electrically connected and whose potential is taken as

reference
3.13
electric drive

combination of traction motor, power electronics and their associated controls for the conversion of

electric to mechanical power and vice versa
3.14
electric shock

physiological effect resulting from an electric current through a human body or animal body

[SOURCE: IEC 60050-195:2021, 195-01-04, modified —“animal body” replaces “livestock”.]

3.15
electrically propelled vehicle
vehicle with one or more electric drive(s) (3.13) for vehicle propulsion
3.16
energized
live

at an electric potential different from that of electric chassis (3.12) at the worksite and which presents

an electrical hazard

Note 1 to entry: A part is energized when it is electrically connected to a source of electric energy. It can also be

energized when it is electrically charged and/or under the influence of an electric or magnetic field.

[SOURCE: IEC 60050-651:2014, 651-21-08, modified — “electric chassis” replaces “earth” and the Note

2 to entry was deleted.]
3.17
equipotential bonding

provision of electric connections between conductive parts (3.6), intended to achieve equipotentiality

[SOURCE: IEC 60050-195:2021, 195-01-10, modified — “provision” replaces “set”.]
3.18
exposed conductive part

conductive part (3.6) of equipment which can be touched and which is not normally live, but which can

become live when basic insulation (3.3) fails

Note 1 to entry: A conductive part of electrical equipment which can become live only through contact with an

exposed conductive part which has become live, is not considered to be an exposed conductive part itself.

[SOURCE: IEC 60050-442:1998, 442-01-21, modified — “equipment” replaces “electric equipment”.]

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ISO/FDIS 6469-3:2021(E)
3.19
fault protection
protection against electric shock (3.14) under single-fault conditions
[SOURCE: IEC 60050-195:2021, 195-06-02]
3.20
fuel cell stack
assembly of two or more fuel cells that are electrically connected
3.21
fuel cell system

system, typically containing the following subsystems: fuel cell stack (3.20), air processing, fuel

processing, thermal management, water management, and their control
3.22
hazardous live part

live part (3.25) which, under certain conditions, can give a harmful electric shock (3.14)

Note 1 to entry: For guidance on harmful physiological effects see IEC 61140.

[SOURCE: IEC 60050-195:2021, 195-06-05, modified — Term changed from “hazardous-live-part” to

“hazardous live part” and Note 1 to entry was added.]
3.23
isolation resistance
insulation resistance

resistance between live parts (3.25) of an electric circuit and the electric chassis (3.12) as well as other

electric circuits which are insulated from this electric circuit
3.24
isolation resistance monitoring system

system that periodically or continuously monitors the isolation resistance (3.23) between live parts

(3.25) and the electric chassis (3.12)
3.25
live part

conductor or conductive part (3.6) intended to be energized (3.16) in normal use, but by convention not

the electric chassis (3.12)
3.26
maximum working voltage

highest value of AC voltage (rms) or of DC voltage that can occur under any normal operating conditions

according to the manufacturer's specifications, disregarding transients and ripple

3.27
overload protection
protection intended to operate in the event of overload on the protected section
[SOURCE: IEC 60050-448:1995, 448-14-31]
3.28
overcurrent protection

protection intended to operate when the current is in excess of a predetermined value

[SOURCE: IEC 60050-448:1995, 448-14-26]
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ISO/FDIS 6469-3:2021(E)
3.29
protective barrier

part providing protection against direct contact (3.10) from any usual direction of access

[SOURCE: IEC 60050-195:2021, 195-06-15, modified — “against direct contact” replaces “against

contact by a human being or livestock with hazardous-live-parts” .]
3.30
protective enclosure

electrical enclosure surrounding internal parts of equipment to prevent access to hazardous live parts

(3.22) from any direction
[SOURCE: IEC 60050-195:2021, 195-06-14]
3.31
RESS
rechargeable energy storage system

rechargeable system that stores energy for delivery of electric energy for the electric drive (3.13)

EXAMPLE Battery, capacitor, flywheel.
3.32
reinforced insulation

insulation of hazardous live parts (3.22) which provides protection against electric shock (3.14)

equivalent to double insulation (3.11)

Note 1 to entry: Reinforced insulation may comprise several layers that cannot be tested singly as basic insulation

(3.3) or supplementary insulation (3.33).
[SOURCE: IEC 60050-581:2008, 581-21-27]
3.33
supplementary insulation

independent insulation applied in addition to basic insulation (3.3), for fault protection (3.19)

[SOURCE: IEC 60050-195:2021, 195-06-07]
3.34
touch current

electric current passing through a human body or through livestock when it touches one or more

accessible parts of cables or equipment
[SOURCE: ISO 17409:2020, 3.57, modified — “cables” replaces “an installation”.]
3.35
vehicle power supply circuit

voltage class (3.36) B electric circuit which includes all parts that are conductively connected (3.7) to

the vehicle inlet (case B, case C) or the plug (case A) or part of an autoconnect charging device that

is mounted on the electrically propelled vehicle (3.15) (case D, case E) and that is operational when

connected to an external electric power supply
Note 1 to entry: Case A, case B, case C are defined in IEC 61851-1.

Note 2 to entry: Case D, case E and autoconnect charging device are defined in IEC 61851-23–1 .

[SOURCE: ISO 17409:2020, 3.61, modified — Note 1 to entry replaced and Note 2 to entry added.]

3.36
voltage class

classification of an electric component or circuit according to its maximum working voltage (3.26)

1) Under preparation. Stage at the time of publication: IEC/PRVC 61851-23-1:2021.

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ISO/FDIS 6469-3:2021(E)
3.37
electric power source
system that provides electric energy
EXAMPLE RESS (3.31), fuel cell system (3.21), photovoltaic system.
4 Voltage classes

Depending on its maximum working voltage U, an electric circuit, a section of a circuit or an electric

component belongs to the voltage classes specified in Table 1.
Table 1 — Voltage classes
Maximum working voltage
Voltage class
DC in V AC in V (rms value)
A 0 < U ≤ 60 0 < U ≤ 30
B 60 < U ≤ 1 500 30 < U ≤ 1 000
B1 60 < U ≤ 75 30 < U ≤ 50
B2 75 < U ≤ 1 500 50 < U ≤ 1 000

The voltage classes B1 and B2 are subclasses of voltage class B. Due to the different voltage levels,

different requirements are specified for voltage class B1 and voltage class B2, whereas the requirements

for voltage class B2 are more stringent. The requirements for voltage class B2 may be applied for the

complete range of voltage class B, including the voltage range of voltage class B1. It is allowed to use

voltage class B instead of voltage class B1 and voltage class B2.

In cases where voltage class B is referenced by another standard, the requirements for voltage class B2

apply.

NOTE 1 Dividing voltage class B into two voltage classes B1 and B2 allows chassis-connected voltage class

B1 drivetrain and connected electrical systems in electric vehicles according to the given scope. Otherwise,

all circuits which contain AC sections with a maximum working voltage between 30 V AC and 50 V AC, and DC

sections with a maximum working voltage up to 60 V DC, would have to be insulated from the chassis, only

because the AC part of the circuit falls into voltage class B range, whereas it would be possible for the DC part to

still fall under the regulations for a voltage class A circuit.

NOTE 2 If the requirements of voltage class B1 are fulfilled, the maximum working voltage of an electric

circuit, a section of a circuit or an electric component can be up to 75 V DC and up to 50 V AC.

NOTE 3 The requirements for voltage class B1 are based on IEC 61140, IEC 60479-1, IEC 60479-2, IEC 60479-5,

and IEC 60364-4–41.

NOTE 4 The voltage limits of voltage class B1 are harmonized with the European Low Voltage Directive and

IEC 61140 (the AC limit). Electric vehicles are not in the scope of the European Low Voltage Directive.

5 General requirements
5.1 Environmental and operational requirements

The requirements given in this document shall be met across the range of environmental and

operational conditions for which the electrically propelled vehicle is designed to operate, as specified

by the vehicle manufacturer.

NOTE See the ISO 16750 series, ISO 21498-1 and the ISO 19453 series for guidance.

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ISO/FDIS 6469-3:2021(E)
5.2 Marking
5.2.1 Marking of voltage class B electric components

The symbol ISO 7010–W012 in Figure 1 shall be visible on protective barriers and protective enclosures,

which, when removed, expose hazardous live parts of voltage class B electric circuits. Accessibility and

removability of protective barriers and protective enclosures should be considered when evaluating

the requirement for the symbol.

The symbol may be embossed or engraved in accordance with Figure 1. In this case colour is not

required.

For a protective enclosure consisting of several parts, one symbol is sufficient when visibility of the

symbol is given.
Figure 1 — ISO 7010-W012 - Warning; Electricity
5.2.2 Marking of voltage class B wiring

The outer covering of cables and harness for voltage class B2 electric circuits not within protective

enclosures or behind protective barriers shall be marked with orange colour. Voltage class B1 cables

and harness shall be marked with a two-colour combination of orange and purple or with orange colour.

In case of the two-colour combination, each colour shall cover at least 30 % of the surface. The marking

shall be visible over the whole cable length and from all usual directions of access.

Voltage class B connectors may be identified by the harnesses to which the connector is attached.

NOTE Specifications of the orange colour are given, for example, in standards in the US (8.75R5.75/12.5)

and in Japan (8.8R5.8/12.5) according to the Munsell colour system.
6 Requirements for protection of persons against electric shock
6.1 General requirements
6.1.1 General requirements for connected sections of a circuit

If not specified otherwise, an electric circuit consisting of conductively connected sections with

different maximum working voltages shall be classified accordi
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