IEC 61326-3-2:2008

IEC 61326-3-2
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical equipment for measurement, control and laboratory use – EMC
requirements –
Part 3-2: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – Industrial
applications with specified electromagnetic environment

Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-2: 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 dont l’environnement
électromagnétique est spécifié
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IEC 61326-3-2
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical equipment for measurement, control and laboratory use – EMC
requirements –
Part 3-2: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – Industrial
applications with specified electromagnetic environment

Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-2: 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 dont l’environnement
électromagnétique est spécifié
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 25.040.40; 33.100.20 ISBN 2-8318-9510-3

SC 65A/Publication 61326-3-2 (2008), First edition/I-SH 01
ELECTRICAL EQUIPMENT FOR MEASUREMENT,
CONTROL AND LABORATORY USE –
EMC REQUIREMENTS –
Part 3-2: Immunity requirements for safety-related
systems and for equipment intended to perform
safety-related functions (functional safety) –
Industrial applications with specified
electromagnetic environment
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 65A: System aspects, of IEC
technical committee 65.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
65A/632/ISH 65A/644/RVD
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
Introduction
equipment intended to perform safety-related functions (functional safety) in industrial
applications with specified electromagnetic environment. The actual immunity levels, test
parameters and applicable basic standards are listed in Table 1a to Table 1f of that standard.
In case of the phenomenon “Conducted r.f.” the basic standard IEC 61000-4-6:2004 shall be
applied. The frequency range under consideration in IEC 61326-3-2:2008 is from 10 kHz to 80
MHz though the basic standard IEC 61000-4-6:2004 lists calibration parameters for the
frequency range from 150 kHz to 80 MHz only. This lack in having some information
concerning the calibration was the reason for having introduced footnote c in Table 1b (and
for the identical footnotes regarding this phenomenon in the other tables).
However, footnote c in Table 1b leaves some space for interpretation as it is not entirely clear
whether it applies to the entire calibration situation for all types of injection methods or to that
one of CDNs only, as in the first case some information would be missing for the situation of
testing via clamp injection.
Interpretation:
Footnote c in Table 1b shall be interpreted as follows:
The basic standard IEC 61000-4-6:2004 allows different injection methods, and their selection
shall be done according to the rules for selecting injection methods and test points (see 7.1 of
IEC 61000-4-6:2004).
June 2013 ICS 25.040.40; 33.100.20

In case the CDN injection method is applied the impedance of the CDN in the frequency range
10 kHz up to 150 kHz has to comply with the asymmetric impedance requirements of
IEC 61000-4-6:2004 at 150 kHz. Calibration shall be performed in accordance with
IEC 61000-4-6:2004. Sufficient decoupling can be demonstrated if the impedance criterion is
met both with the AE port short-circuited and then open-circuited.
In case the clamp injection is applied the procedures of 7.3 or 7.4 of the basic standard
IEC 61000-4-6:2004 are applicable in the frequency range from 10 kHz to 150 kHz as well.

_____________
June 2013 ICS 25.040.40; 33.100.20

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

1 Scope.9
2 Normative references .10
3 Terms and definitions .11
4 General .13
5 EMC test plan.14
5.1 General .14
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 .15
5.2.5 Auxiliary equipment .15
5.2.6 Cabling and earthing (grounding).15
5.3 Operation conditions of EUT during testing.15
5.3.1 Operation modes .15
5.3.2 Environmental conditions.15
5.3.3 EUT software during test .15
5.4 Specification of performance criteria .15
5.5 Test description.15
6 Performance criteria .16
6.1 Performance criteria A, B and C .16
6.2 Performance criterion FS.16
6.3 Application of the performance criterion FS .16
7 Immunity requirements .16
8 Test set-up and test philosophy for EUT with functions intended for safety
applications .19
8.1 Testing of safety-related systems and equipment intended to be used in
safety-related systems .19
8.2 Test philosophy for equipment intended for use in safety-related systems.20
8.3 Test philosophy for safety-related systems .20
8.4 Test configuration.20
8.5 Monitoring .21
9 Test results and test report.21

Annex A (informative) Evaluation of electromagnetic phenomena .25
Annex B (informative) Details of the specified electromagnetic environment .27
Annex C (informative) Example of immunity levels in the process industry.31

Bibliography.32

Figure 1 – Correlation between the standards IEC 61326-1, IEC 61326-2-X,
IEC 61326-3-1 and IEC 61326-3-2 .8

61326-3-2 © IEC:2008 – 3 –
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 .22
Figure 3 – Typical test set-up for equipment intended for use in a safety-related system
tested stand-alone .23
Figure 4 – Test set-up for a safety-related system .24
Figure B.1 – Recommended cable layouts for different categories .28

Tabl
...