ISO 16750-4:2023

Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 4: Climatic loads

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 recommended for the specific mounting location on/in the vehicle. This document describes climatic loads. This document is not intended to apply to environmental requirements or testing for systems and components of motorcycles and mopeds. 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.

Véhicules routiers — Spécifications d'environnement et essais de l'équipement électrique et électronique — Partie 4: Contraintes climatiques

General Information

• Status: Published
• Publication Date: 23-Jul-2023
• 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: 9092 - International Standard to be revised
• Due Date: 21-Mar-2025
• Completion Date: 21-Mar-2025

Relations

• Revises: ISO 16750-4:2010 - Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 4: Climatic loads
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16750-4
Fourth edition
2023-07
Road vehicles — Environmental
conditions and testing for electrical
and electronic equipment —
Part 4:
Climatic loads
Véhicules routiers — Spécifications d'environnement et essais de
l'équipement électrique et électronique —
Partie 4: Contraintes climatiques
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Operating temperature ranges . 2
5 Tests and requirements .4
5.1 Tests at constant temperature . 4
5.1.1 Low-temperature tests . 4
5.1.2 High-temperature tests . 4
5.2 Temperature step test . 5
5.2.1 Purpose . 5
5.2.2 Test method . 5
5.2.3 Requirement . 6
5.3 Temperature cycling tests . 6
5.3.1 Temperature cycle with specified change rate . 6
5.3.2 Rapid change of temperature with specified transition duration .13
5.4 Cold water shock tests . 15
5.4.1 Purpose .15
5.4.2 Splash water test . 15
5.4.3 Submersion test . 19
5.5 Salt spray tests . 20
5.5.1 General .20
5.5.2 Corrosion test . 21
5.5.3 Leakage and function test . 21
5.5.4 Salt spray active test for rotating machines with open housing .22
5.5.5 Salt spray combined cycle test . 24
5.5.6 Cyclic corrosion test . 26
5.6 Humid heat, cyclic tests . 27
5.6.1 Purpose . 27
5.6.2 Test method . 27
5.6.3 Requirements .30
5.7 Damp heat, steady state test . 30
5.7.1 Purpose .30
5.7.2 Test method . 30
5.7.3 Requirements .30
5.8 Condensation test. 31
5.8.1 Purpose . 31
5.8.2 Test method . 31
5.8.3 Requirement . 35
5.9 Corrosion test with flow of mixed gas . 35
5.9.1 Purpose . 35
5.9.2 Test method . 35
5.9.3 Requirement . 35
5.10 Solar radiation test . 35
5.10.1 Purpose . 35
5.10.2 Test method . 35
5.10.3 Requirements .36
5.11 Dust test . . . 36
5.11.1 Purpose . 36
5.11.2 Test method . 36
5.11.3 Requirements .38
5.12 Atmospheric pressure test . .38
5.12.1 Purpose .38
iii
5.12.2 Test method .38
5.12.3 Requirements .39
6 Code for climatic loads . .39
7 Protection against water and foreign objects .41
8 Documentation .41
Annex A (informative) Usual tests and requirements for equipment depending on the
mounting location.42
Annex B (informative) Background information to determine the number of cycles of the
salt spray combined cycle test .47
Annex C (informative) Insulation tests .52
Annex D (informative) The necessity of testing atmospheric pressure .55
Bibliography .59
iv
Foreword
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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 document 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).
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of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be requ
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