IEC 60068-3-3:2019

Environmental testing - Part 3-3: Supporting documentation and guidance - Seismic test methods for equipment

IEC 60068-3-3:2019 applies primarily to electro-technical equipment but its application can be extended to other equipment and to components. In addition, if some type of analysis is always performed when making a seismic qualification, for example for the choice of the representative sample to be tested or for the extension of the seismic qualification from the tested specimen to similar specimens, the verification of the performance of an equipment by analysis or by a combination of testing and analysis can be acceptable but is outside the scope of this document, which is restricted to verification based entirely upon data from dynamic testing. This second edition cancels and replaces the first edition published in 1991. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the main aim of this revision is to connect the testing level to the seismic activity level of the zone where the equipment could be installed;
- a standard shape for the required response spectrum is also given for the general seismic class for which the seismic environment is either not known or is imprecisely known;
- Clauses 11 to 15 were renumbered and some adjustments were made as their content is very general and the requirements can be applied both to the general seismic class and to the specific seismic class;
- the word “envelope” is replaced with “dominance” and “to envelop” with “to dominate” in order to provide a more precise meaning from a mathematical point of view.
The contents of the corrigendum of September 2021 have been included in this copy.

Essais d'environnement - Partie 3-3 : Documentation d’accompagnement et recommandations - Méthodes d’essais sismiques applicables aux matériels

L’IEC 60068-3-3:2019 s’applique principalement au matériel électrotechnique mais son application peut s’étendre à d’autres matériels et composants. Par ailleurs, si un certain type d’analyse est toujours effectuée lors de la réalisation d’une qualification sismique, par exemple pour choisir l’échantillon représentatif à soumettre à essai ou pour étendre la qualification sismique du spécimen soumis à essai à des spécimens similaires, la vérification des performances d’un matériel par l’analyse ou par une combinaison d’essais et d’analyses peut être acceptable mais elle n’entre pas dans le domaine d’application du présent document, qui se limite à la vérification uniquement fondée sur les données d’essais dynamiques. Cette deuxième édition annule et remplace la première édition parue en 1991. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le principal objectif de la présente révision est d’adapter le niveau d’essai au niveau d’activité sismique de la zone où le matériel est susceptible d’être installé;
- une forme normalisée du spectre de réponse spécifié est également fournie pour la classe sismique générale pour laquelle l’environnement sismique n’est pas connu ou l’est de manière imprécise;
- les Articles 11 à 15 ont été renumérotés et plusieurs ajustements ont été effectués car le contenu de ces articles est très général et les exigences peuvent s’appliquer aussi bien à la classe sismique générale qu’à la classe sismique spécifique;
- le terme «enveloppe» est remplacé par «dominance» et «envelopper» par «dominer» afin d’expliciter ces termes du point de vue mathématique.
Le contenu du corrigendum de septembre 2021 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 22-Aug-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 19.040 - Environmental testing
• Technical Committee: TC 104 - Environmental conditions, classification and methods of test
• Drafting Committee: MT 17 - TC 104/MT 17
• Current Stage: PPUB - Publication issued
• Start Date: 26-Jul-2019
• Completion Date: 23-Aug-2019

Relations

• Corrected By: IEC 60068-3-3:2019/COR1:2021 - Corrigendum 1 - Environmental testing - Part 3-3: Supporting documentation and guidance - Seismic test methods for equipment
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60068-3-3 ®
Edition 2.0 2019-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for
equipments
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
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If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 60068-3-3 ®
Edition 2.0 2019-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for

equipments
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.040 ISBN 978-2-8322-7315-9

– 2 – IEC 60068-3-3:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Object Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General and qualification considerations . 14
4.1 General seismic class and specific seismic class . 14
4.2 Service conditions . 15
4.3 Malfunction criteria . 15
4.4 Qualification criteria . 15
5 Testing procedures . 15
5.1 General . 15
5.2 Mounting . 15
5.3 Measurements . 15
5.3.1 Vibration measurements at the vibration table . 15
5.3.2 Vibration measurements on the equipment . 16
5.3.3 Functional monitoring of the equipment . 16
5.4 Frequency range . 16
6 Conditioning . 16
Standard amplitude conventional test method .
7 Test wave selection . 17
7.1 General . 17
7.2 Multifrequency waves. 18
7.3 Single-frequency waves . 18
8 Test waves . 18
8.1 General . 18
8.1.1 Specification of test waves . 18
8.1.2 Simulation with a safety margin of the effects of an earthquake . 19
8.2 Multifrequency wave testing . 19
8.2.1 General requirements . 19
8.2.2 Time-history test . 19
8.2.3 Other multifrequency tests . 20
8.3 Single-frequency testing . 20
8.3.1 General requirements . 20
8.3.2 Sine-sweep test . 21
8.3.3 Sine-beat test . 21
8.3.4 Continuous sine test . 21
8.4 Other test wave forms . 22
9 Testing conditions . 22
9.1 General . 22
9.2 Vibration response investigation . 23
9.3 Test methods . 23
9.3.1 Test method for equipment without critical frequencies . 23
9.3.2 Test method for equipment with critical frequencies . 24
9.4 Selection of damping . 24

9.5 S1-earthquake and S2-earthquake testing . 25
9.6 Specific application testing . 25
9.7 Assembly testing . 25
9.8 Component testing . 25
10 Single and multi-axis testing . 26
10.1 General . 26
10.2 Single-axis testing . 26
10.3 Biaxial testing . 26
10.3.1 General requirements . 26
10.3.2 Two horizontal axes . 26
10.3.3 One horizontal axis and one vertical axis . 26
10.4 Triaxial testing . 27
10.4.1 General . 27
10.4.2 Triaxial installation . 27
10.4.3 Biaxial installation (one horizontal axis, one vertical axis) . 28
11 Conditioning for the general seismic class . 28
11.1 Selection of test type . 28
11.2 Test method . 28
12 Calculated amplitude test method for the general seismic class . 29
12.1 Application . 29
12.2 Testing conditions . 29
12.2.1 General . 29
12.2.2 Performance level . 29
12.2.3 Test wave selection . 29
12.2.4 Damping ratio . 29
12.2.5 Ground acceleration (a ) . 29
g
12.2.6 Superelevation factor (K) . 31
12.2.7 Direction factor (D) . 32
12.2.8 Floor acceleration (a ) . 32
f
13 Testing parameters for the general seismic class . 32
13.1 Duration of test . 32
13.2 Test acceleration (a ) . 33
t
13.2.1 General . 33
13.2.2 Wave factor (α) . 33
13.2.3 Geometric factor (G) . 34
14 Required response spectrum for the general seismic class . 34
15 Testing procedures for the general seismic class . 35
15.1 Vibration response investigation (VRI) . 35
15.2 Types of test . 36
15.2.1 Sine-beat test . 36
15.2.2 Sine-sweep test . 37
15.2.3 Time-history test . 37
15.2.4 Other test wave forms . 37
16 Conditioning for the specific seismic class . 37
17 Test wave selection for the specific seismic class . 37
17.1 General . 37
17.2 Multifrequency waves. 37
17.3 Single-frequency waves . 38

– 4 – IEC 60068-3-3:2019 RLV © IEC 2019
18 Test
...

IEC 60068-3-3 ®
Edition 2.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for
equipment
Essais d’environnement –
Partie 3-3: Documentation d’accompagnement et recommandations – Méthodes
d’essais sismiques applicables aux matériels

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
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les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 60068-3-3 ®
Edition 2.0 2019-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 3-3: Supporting documentation and guidance – Seismic test methods for

equipment
Essais d’environnement –
Partie 3-3: Documentation d’accompagnement et recommandations – Méthodes

d’essais sismiques applicables aux matériels

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-7097-4

– 2 – IEC 60068-3-3:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General and qualification considerations . 14
4.1 General seismic class and specific seismic class . 14
4.2 Service conditions . 14
4.3 Malfunction criteria . 15
4.4 Qualification criteria . 15
5 Testing procedures . 15
5.1 General . 15
5.2 Mounting . 15
5.3 Measurements . 15
5.3.1 Vibration measurements at the vibration table . 15
5.3.2 Vibration measurements on the equipment . 16
5.3.3 Functional monitoring of the equipment . 16
5.4 Frequency range . 16
6 Conditioning . 16
7 Test wave selection . 16
7.1 General . 16
7.2 Multifrequency waves. 16
7.3 Single-frequency waves . 17
8 Test waves . 17
8.1 General . 17
8.1.1 Specification of test waves . 17
8.1.2 Simulation with a safety margin of the effects of an earthquake . 17
8.2 Multifrequency wave testing . 18
8.2.1 General requirements . 18
8.2.2 Time-history test . 18
8.2.3 Other multifrequency tests . 18
8.3 Single-frequency testing . 19
8.3.1 General requirements . 19
8.3.2 Sine-sweep test . 19
8.3.3 Sine-beat test . 19
8.3.4 Continuous sine test . 20
8.4 Other test wave forms . 20
9 Testing conditions . 20
9.1 General . 20
9.2 Vibration response investigation . 21
9.3 Test methods . 21
9.3.1 Test method for equipment without critical frequencies . 21
9.3.2 Test method for equipment with critical frequencies . 22
9.4 Selection of damping . 22
9.5 S1-earthquake and S2-earthquake testing . 23

9.6 Specific application testing . 23
9.7 Assembly testing . 23
9.8 Component testing . 23
10 Single and multi-axis testing . 24
10.1 General . 24
10.2 Single-axis testing . 24
10.3 Biaxial testing . 24
10.3.1 General requirements . 24
10.3.2 Two horizontal axes . 24
10.3.3 One horizontal axis and one vertical axis . 24
10.4 Triaxial testing . 25
10.4.1 General . 25
10.4.2 Triaxial installation . 25
10.4.3 Biaxial installation (one horizontal axis, one vertical axis) . 26
11 Conditioning for the general seismic class . 26
11.1 Selection of test type . 26
11.2 Test method . 26
12 Calculated amplitude test method for the general seismic class . 27
12.1 Application . 27
12.2 Testing conditions . 27
12.2.1 General . 27
12.2.2 Performance level . 27
12.2.3 Test wave selection . 27
12.2.4 Damping ratio . 27
12.2.5 Ground acceleration (a ) . 27
g
12.2.6 Superelevation factor (K) .
...