IEC 61326-3-1:2008

IEC 61326-3-1
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical equipment for measurement, control and laboratory use – EMC
requirements –
Part 3-1: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – General
industrial applications
Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-1: Exigences d'immunité pour les systèmes relatifs à la sécurité et pour
les matériels destinés à réaliser des fonctions relatives à la sécurité (sécurité
fonctionnelle) – Applications industrielles générales

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IEC 61326-3-1
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical equipment for measurement, control and laboratory use – EMC
requirements –
Part 3-1: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – General
industrial applications
Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-1: Exigences d'immunité pour les systèmes relatifs à la sécurité et pour
les matériels destinés à réaliser des fonctions relatives à la sécurité (sécurité
fonctionnelle) – Applications industrielles générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS 25.040.40; 33.100.20 ISBN 2-8318-9509-X

– 2 – 61326-3-1 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.9
2 Normative references .9
3 Terms and definitions .11
4 General .13
5 EMC test plan.13
5.1 General .13
5.2 Configuration of EUT during testing.14
5.2.1 General .14
5.2.2 Composition of EUT.14
5.2.3 Assembly of EUT.14
5.2.4 I/O ports .14
5.2.5 Auxiliary equipment .14
5.2.6 Cabling and earthing (grounding).14
5.3 Operation conditions of EUT during testing.14
5.3.1 Operation modes .14
5.3.2 Environmental conditions.14
5.3.3 EUT software during test .15
5.4 Specification of performance criteria .15
5.5 Test description.15
6 Performance criteria .15
6.1 Performance criteria A, B and C .15
6.2 Performance criterion FS.15
6.3 Application of the performance criterion FS .16
7 Immunity requirements .16
8 Test set-up and test philosophy for EUTs with functions intended for safety
applications .22
8.1 Testing of safety-related systems and equipment intended to be used in
safety-related systems .22
8.2 Test philosophy for equipment intended for use in safety-related systems.23
8.3 Test philosophy for safety-related systems .24
8.4 Test configuration.24
8.5 Monitoring .24
9 Test results and test report.25

Annex A (informative) Evaluation of electromagnetic phenomena .29
Annex B (informative) Allowed effects during immunity tests.33

Bibliography.38

Figure 1 – Correlation between the standards IEC 61326-1, IEC 61326-2-X,
IEC 61326-3-1 and IEC 61326-3-2 .8
Figure 2 – Typical test set-up for equipment intended for use in a safety-related system
integrated into a representative safety-related system during test .26

61326-3-1 © IEC:2008 – 3 –
Figure 3 – Typical test set-up for equipment intended for use in safety-related system
tested stand-alone .27
Figure 4 – Typical test set-up for a safety-related system .28
Figure A.1 – Emission/immunity levels and compatibility level, with an example of
emission/immunity levels for a single emitter and susceptor, as a function of some
independent variables (see IEC 61000-1-1) .30

Table 1a – Immunity test requirements for equipment intended for use in industrial
locations – Enclosure port.17
Table 1b – Immunity test requirements for equipment intended for use in industrial
locations – Input and output a.c. power ports .18
Table 1c – Immunity test requirements for equipment intended for use in industrial
locations – Input and output d.c. power ports .19
Table 1d – Immunity test requirements for equipment intended for use in industrial
locations – I/O signal/control ports .20
Table 1e – Immunity test requirements for equipment intended for use in industrial
locations – I/O signal/control ports connected direct to power supply networks .21
Table 1f – Immunity test requirements for equipment intended for use in industrial
locations – Functional earth port .21
Table 2 – Selected frequencies for electromagnetic field tests .22
Table 3 – Selected frequencies for conducted r.f. tests .22
Table 4 – Applicable performance criteria and observed behaviour during test for
equipment intended for use in safety-related systems .23
Table A.1 – Exemplary considerations on electromagnetic phenomena and test levels
with regard to functional safety in industrial applications.32
Table B.1 – Allowed effects during immunity tests on functions of equipment.34
Table B.2 – Allowed effects during immunity tests on functions of a system .36

– 4 – 61326-3-1 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL EQUIPMENT FOR MEASUREMENT,
CONTROL AND LABORATORY USE –
EMC REQUIREMENTS –
Part 3-1: Immunity requirements for safety-related
systems and for equipment intended to perform
safety-related functions (functional safety) –
General industrial applications

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with
...