ISO/FDIS 16750-1

Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 1: General

Véhicules routiers — Spécifications d'environnement et essais de l'équipement électrique et électronique — Partie 1: Généralités

General Information

• Status: Not Published
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32/WG 2 - Environmental conditions
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 31-Mar-2023
• Completion Date: 31-Mar-2023

Relations

• Revises: ISO 16750-1:2018 - Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 1: General
• Effective Date: 23-Apr-2020

Standards Content (Sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 16750-1.2
ISO/TC 22/SC 32 Secretariat: JISC
Voting begins on: Voting terminates on:
2023-03-02 2023-04-27
Road vehicles — Environmental conditions and testing for
electrical and electronic equipment —
Part 1:
General

Véhicules routiers — Spécifications d'environnement et essais de l'équipement électrique et électronique —

Partie 1: Généralités
ICS: 43.040.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
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NOT BE REFERRED TO AS AN INTERNATIONAL
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ISO/DIS 16750-1.2:2023(E)
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ISO/DIS 16750-1.2:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16750-1.2
ISO/TC 22/SC 32 Secretariat: JISC
Voting begins on: Voting terminates on:
Road vehicles — Environmental conditions and testing for
electrical and electronic equipment —
Part 1:
General

Véhicules routiers — Spécifications d'environnement et essais de l'équipement électrique et électronique —

Partie 1: Généralités
ICS: 43.040.10
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
THEREFORE SUBJECT TO CHANGE AND MAY
This document is circulated as received from the committee secretariat.

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

NOT BE REFERRED TO AS AN INTERNATIONAL

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CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 16750-1.2:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2023 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
---------------------- Page: 2 ----------------------
ISO/DIS 16750-1.2:2023(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .............................................................................................................................................................................................................................. vi

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

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

3 Terms and definitions .................................................................................................................................................................................... 2

4 Classification by mounting location ................................................................................................................................................5

4.1 Engine/electric motor compartment .................................................................................................................................. 5

4.2 Passenger compartment ................................................................................................................................................................ 6

4.3 Luggage compartment/load compartment .................................................................................................................. 6

4.4 Mounting on exterior/in cavities ........................................................................................................................................... 6

4.5 Other mounting location ................................................................................................................................................................ 7

5 Operating modes .................................................................................................................................................................................................. 7

5.1 General ........................................................................................................................................................................................................... 7

5.2 Operating mode 1 ................................................................................................................................................................................. 9

5.3 Operating mode 2 ................................................................................................................................................................................. 9

5.4 Operating mode 3 ................................................................................................................................................................................. 9

5.5 Operating mode 4 .............................................................................................................................................................................. 10

6 Functional status classification ........................................................................................................................................................10

6.1 General ........................................................................................................................................................................................................ 10

6.2 Class A ......................................................................................................................................................................................................... 10

6.3 Class B ......................................................................................................................................................................................................... 10

6.4 Class C .......................................................................................................................................................................................................... 11

6.5 Class D ......................................................................................................................................................................................................... 11

6.6 Class E ........................................................................................................................................... ............................................................... 11

7 Tests and requirements ............................................................................................................................................................................11

7.1 General ........................................................................................................................................................................................................ 11

7.2 General test conditions ................................................................................................................................................................ 11

7.3 Test sequence ........................................................................................................................................................................................12

7.4 Test setup .................................................................................................................................................................................................12

7.5 Test procedure .....................................................................................................................................................................................12

7.6 Parameter check ................................................................................................................................................................................ 12

7.7 Physical analysis (visual inspection) ............................................................................................................................... 13

8 Designation .............................................................................................................................................................................................................13

8.1 Coding .......................................................................................................................................................................................................... 13

8.2 Use of Code Z “as agreed” ........................................................................................................................................................... 14

Annex A (informative) Example of a test plan ........................................................................................................................................15

Annex B (informative) Example of life test/reliability statement ....................................................................................16

Annex C (informative) Example of component mass classification .................................................................................20

Bibliography .............................................................................................................................................................................................................................21

iii
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ISO/DIS 16750-1.2:2023(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 32,

Electrical and electronic components and general system aspects.

This fourth edition cancels and replaces the third edition (ISO 16750-1:2018), which has been

technically revised. However, this revised ISO 16750 series does not contain electrical testing conditions

or requirements in part 2 for the voltage class B circuits of voltage class B components as well as 48 V

circuits of 48 V components. For electrical testing conditions or requirements for voltage class B

components and 48 V circuits of 48 V components, see instead ISO 21498 (voltage class B components)

and ISO 21780 (48 V components).
The main changes compared to the previous edition are as follows:

— Integrating and harmonizing contents from ISO 19453-1:2018, (e.g. addition of 5.5 Operating mode

4);

— Integrating terms from ISO 19453-1:2018 and addition of terms considering common terms in

ISO 16750 series;

— Modification to subdivide mounting locations matching with climate load tests of ISO 16750-4;

— Addition of operating modes for 48 V DUT and voltage class B DUT (Clause 5);
— Reorganization of operating mode tables for easy understanding (Clause 5);

— Clarification of test procedure regarding parameter check and physical analysis (Clause 7.6, 7.7);

— Update of coding system integrating voltage class A DUT and voltage class B DUT (Clause 8);

— Definition of mass and volume classes related to mechanical and climatic loads (Annex C).

A list of all parts in the ISO 16750 series can be found on the ISO website.
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ISO/DIS 16750-1.2:2023(E)

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.
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ISO/DIS 16750-1.2:2023(E)
Introduction

The purpose of the ISO 16750 series is to assist its user in systematically defining and/or applying a set

of internationally accepted environmental conditions, tests and operating requirements based on the

anticipated actual environment which the equipment will be operated in and exposed to during its life

cycle.

The following environmental factors have been considered in the development of this document.

— World geography and climate

Road vehicles are operated in nearly all land regions of the earth. Significant variations in environmental

conditions due to climatic environment, including diurnal and seasonal cycles, can therefore be

expected. Consideration has been given to worldwide ranges in temperature, humidity, precipitation

and atmospheric conditions including dust, pollution and altitude.
— Type of vehicle

Environmental conditions in and on road vehicles can depend on vehicle design attributes, such as

whether to equip an internal combustion engine and/or an electric motor for vehicle propulsion, vehicle

mass, vehicle size, electrical supply voltage and so on. Considerations have been given to typical series

production vehicles, including passenger cars, light duty trucks and commercial (heavy) buses and

trucks not only propelled by diesel or gasoline engines but also propelled by electric motors. These

considerations include hybrid electric vehicles, battery electric vehicles, range extender hybrid electric

vehicles and fuel cell vehicles, but does not include the equipment specific for fuel cell systems.

— Vehicle use conditions and operating modes

Environmental conditions in and on the vehicle vary significantly with road quality, types of road

surface, road topography, vehicle use (e.g. commuting, towing, cargo transport, etc.) and driving

habits. Operating modes such as storage, starting, driving, stopping and so on have been considered.

Additionally, it has been taken into account that there is a difference of engine speed distributions

between conventional vehicles and hybrid electric vehicles where driving modes with shut off

combustion engine exist.
— Equipment life cycle

Electrical and electronic equipment is intended to be resistant to environmental conditions experienced

during manufacture, shipping, handling, storage, vehicle assembly and vehicle maintenance and repair.

Such conditions and tests (e.g. handling drop to be tested by Free fall test) are within the scope of this

document.
— Vehicle supply voltage

Supply voltage varies with vehicle use, operating mode, electrical distribution system design and even

climatic conditions.
— Component mass and volume

The component mass and volume has a significant impact on the response of the device under test (DUT)

to environmental loads, especially with respect to vibration and thermal load. For thermal loads the

higher thermal capacity of the DUT is the major influence. For vibration loads the high dynamic system

coupling (caused by high mass and moment of inertia as well as the centre of gravity) becomes relevant.

Current components of the drive system of electrically propelled road vehicles, such as electric motors,

inverters or DC-DC converters, tend to be much larger and heavier than small and lightweight E/E

equipment, such as small sensors, ECUs or fuel injection equipment. Adding such equipment, the size

and mass of components of the electric powertrain have been considered in this document, for example,

by taking the inertia mass of those components into account as an effect on the measured excitation

during vibration measurements. Also, the size and mass significantly influence the necessary exposure

time at low and high temperatures when applying a thermal profile, such as in ISO 16750-4, as it takes

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ISO/DIS 16750-1.2:2023(E)

much longer to reach the intended temperature in the core of the component (stabilisation time). For

performing proper tests according to different component mass and volume, one of the typical solutions

is to apply different test profiles based on a mass classification. This document shows an example of

such mass classification (see Annex C in this document).
— Mounting location in the vehicle

In current or future vehicle concepts, systems/components are mounted in almost any location of the

vehicle. The environmental requirements for each specific application highly depend on its mounting

location. Each location in a vehicle has its distinct set of environmental loads. As an example, the range

of temperatures in the engine/electric motor compartment differs significantly from the range in the

passenger compartment. This is also true for the vibration loads, except that in this case, not only are

the vibration levels different, but the type of vibration load also varies. Body mounted components

are typically exposed to random vibrations whereas for engine mounted systems/components the

additional sine vibration from the engine is considered. Moreover, devices installed in doors are

exposed to a high number of mechanical shocks from door slamming.

It is desirable for the vehicle manufacturer to group the different environmental load types and levels

in a reasonable number of standard requirement sets. This strategy makes it possible to carry systems/

components from one vehicle project to another. Furthermore, the exact requirement levels are often

unknown when designing a component for a future vehicle concept. The expected environmental loads

are usually compiled from other vehicle concepts with similar conditions. The grouping is normally

done by mounting location, but it is difficult to define the right number of different mounting locations

and respective load profiles, because there is a conflict of aims between having only few requirement

classes and tailoring the requirement levels to each application. The reason is that the environmental

loads are not only depending on the mounting location. There are other major factors that affect the

stress levels for systems/components. For example, body styles, drive-train concepts or package

densities can create absolutely different requirement levels for devices that are installed in different

vehicles at almost the same location.

The purpose of the ISO 16750 series is to define requirement classes for separate load types. It

distinguishes between electrical, mechanical, thermal, climatic and chemical loads. For each load type,

several requirement classes are defined. Every requirement class is determined by a specific code letter.

The complete environmental requirement set is created by defining the code letter combination. The

code letters are defined in the respective clauses of this document. Additionally, tables in the annexes

of each part show the usual mounting locations and give examples of their respective code letters. For

normal applications, these code letters are used. If an application is very specific and therefore, the

given code letter combinations cannot be used, it is possible to create new code letter combinations

to serve this purpose. In case none of the given code letters is usable, new requirement levels can be

created by using the code letter Z. In this case, the specific requirements are defined separately, but it is

desirable not to change the test methods.

At a minimum, the following mounting locations referred to in clause 4 of this document should be

considered for a DUT with respect to thermal, mechanical, climatic and chemical loads.

a) Applicability to manufacturer’s responsibility

Due to technology limitations or variations in vehicle design, the vehicle manufacturer can be required

to place a component in a location where it cannot withstand the environmental conditions described

in the ISO 16750 series. Under these circumstances, it is the responsibility of the vehicle manufacturer

to provide the necessary environmental protection.
b) Applicability to wiring harnesses, cables and electrical connectors

Although some environmental conditions and tests in the ISO 16750 series can be relevant to vehicle

wiring harnesses, cables and connectors, its scope is not sufficient to be used as a complete standard.

It is therefore, not recommended that the ISO 16750 series is directly applied to such devices and

equipment.
c) Applicability to parts or assemblies in or on equipment
vii
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ISO/DIS 16750-1.2:2023(E)

The ISO 16750 series describes environmental conditions and tests to be applied to electrical and

electronic equipment directly mounted in or on the vehicle. It is not intended for direct application to

parts or assemblies that are part of the equipment. For example, the ISO 16750 series should not be

directly applied to integrated circuits (ICs) and discrete components, electrical connectors, printed

circuit boards (PCBs), gauges, etc. that are attached in or on the equipment. Electrical, mechanical,

climatic and chemical loads for such parts and assemblies can be quite different from those described

in the ISO 16750 series.

On the other hand, it is desirable to use the ISO 16750 series to help derive environmental conditions

and test requirements for parts and assemblies that are intended for use in road vehicle equipment. For

example, a temperature range from −40 °C to 90 °C may be specified for parts or assemblies contained

inside a piece of equipment having a temperature range of −40 °C to 70 °C and an additional temperature

rise of 20 K.
d) Applicability relative to system integration and validation

The user of the ISO 16750 series is cautioned that the scope of the ISO 16750 series is limited to

conditions and testing at the equipment level, and therefore does not represent all conditions and

testing necessary for complete verification and validation of the vehicle system. Environmental and

reliability testing of equipment parts and vehicle systems can be required.

For example, the ISO 16750 series does not necessarily ensure that environmental and reliability

requirements for solder joints, solderless connections, integrated circuits and so on are met. Such items

are ensured at the part, material or assembly level. Additionally, vehicle and system level testing can be

required to validate the equipment in the vehicle application.
e) Applicability to high voltage battery packs and systems or components inside

Although some environmental conditions and tests of mechanical loads in ISO 16750-3 and climatic

loads in ISO 16750-4 can be relevant to high voltage battery packs (e.g. for traction) and systems

or components inside, their scope is not sufficient to be used as a complete standard. It is therefore

not recommended that the ISO 16750 series is directly applied to such devices and equipment. The

dedicated International Standard, ISO 19453-6, is taken into account.
viii
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DRAFT INTERNATIONAL STANDARD ISO/DIS 16750-1.2:2023(E)
Road vehicles — Environmental conditions and testing for
electrical and electronic equipment —
Part 1:
General
1 Scope

This document applies to electric and electronic systems and components for vehicles including electric

propulsion systems and components with maximum working voltages according to voltage class B. It

describes the potential environmental stresses and specifies tests and requirements for the specific

mounting location on/in the vehicle.

This document contains the vocabulary for the ISO 16750 series and general requirements.

This document is not intended to apply to environmental requirements or testing for systems and

components of motorcycles and mopeds. Electromagnetic compatibility (EMC) is not covered by this

document.

Systems and their components released for production, or systems and their components already under

development prior to the publication date of this document, can be exempted from fulfilling the changes

in this edition compared to the previous one.
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 6469-3, Electrically propelled road vehicles — Safety specifications — Part 3: Electrical safety

ISO 16750-2, Road vehicles — Environmental conditions and testing for electrical and electronic

equipment — Part 2: Electrical loads

ISO 16750-3, Road vehicles — Environmental conditions and testing for electrical and electronic

equipment — Part 3: Mechanical loads

ISO 16750-4, Road vehicles — Environmental conditions and testing for electrical and electronic

equipment — Part 4: Climatic loads

ISO 16750-5, Road vehicles — Environmental conditions and testing for electrical and electronic

equipment — Part 5: Chemical loads

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

foreign objects, water and access

ISO 21498-1, Electrically propelled road vehicles — Electrical specifications and tests for voltage class B

systems and components — Part 1: Voltage sub-classes and characteristics

ISO 21780, Road vehicles — Supply voltage of 48 V — Electrical requirements and tests

EN 13018, Non-destructive testing — Visual testing — General principles
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ISO/DIS 16750-1.2:2023(E)
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/
3.1
active operating modes
operating modes with electric operation and control in some load

Note 1 to entry: This term is a substitute to avoid redundant repeats, used in requirements when describing

operating modes aforementioned in test method.

EXAMPLE The term “active operating modes” described in requirements substitutes for “operating mode

3.2, 3.3 and/or 3.4” in test method.
3.2
customer
party that is using electrical and electronic equipment
3.3
device under test (DUT)
single component or combination of components (system) as defined to be tested
3.4
dwell time

time that the systems/components reached and stay within the specified conditions (e.g. temperature,

voltage, engine speed)
3.5
electric propulsion system
combination of traction motor, p
...