IEC 61000-3-11:2017

IEC 61000-3-11 ®
Edition 2.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electromagnetic compatibility (EMC) –
Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and flicker
in public low-voltage supply systems – Equipment with rated current ≤75 A and
subject to conditional connection

Compatibilité électromagnétique (CEM) –
Partie 3-11: Limites – Limitation des variations de tension, des fluctuations de
tension et du papillotement dans les réseaux publics d’alimentation basse
tension – Équipements ayant un courant assigné ≤75 A et soumis à un
raccordement conditionnel
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IEC 61000-3-11 ®
Edition 2.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electromagnetic compatibility (EMC) –

Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and flicker

in public low-voltage supply systems – Equipment with rated current ≤75 A and

subject to conditional connection

Compatibilité électromagnétique (CEM) –

Partie 3-11: Limites – Limitation des variations de tension, des fluctuations de

tension et du papillotement dans les réseaux publics d’alimentation basse

tension – Équipements ayant un courant assigné ≤75 A et soumis à un

raccordement conditionnel
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-4163-9

– 2 – IEC 61000-3-11:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements . 7
5 Limits . 8
6 Test, measurement and evaluation procedures . 9
6.1 Overview. 9
6.2 Test and measurement procedures . 9
6.2.1 Test impedance Z . 9
test
6.2.2 Test of equipment against Z . 10
test
6.2.3 Evaluation against Z . 10
ref
6.3 Evaluation and declaration by the manufacturer of the maximum permissible
system impedance . 10
6.3.1 Comparison of calculated and measured emission values with Clause 5
limits to enable a declaration of compliance with IEC 61000-3-3 . 10
6.3.2 Calculation of the maximum permissible system impedance . 10
6.4 Evaluation and declaration by the manufacturer of the minimum permissible
service current capacity . 11
Annex A (informative) Explanation of flicker exponents . 12
A.1 Overview. 12
A.2 Explanation of Clause 6 . 12
Annex B (informative) Flow chart showing the evaluation and test procedures leading
to the connection of equipment . 17

Figure A.1 – Typical motor starting RMS voltage variation plot . 12
Figure A.2 – Visualization of the relationship between items of equipment “n” and P . 15
st
Figure A.3 – Impedance requirements as a function of individual P values and
st@Zref
penetration level n . 16
Figure B.1 – Flow chart showing the evaluation and test procedures leading to the
connection of equipment . 17
Figure B.2 – Reference network for single and three-phase supplies derived from a
three-phase, four-wire supply . 18

Table 1 – Suffixes and their applications . 9

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 3-11: Limits – Limitation of voltage changes, voltage fluctuations and
flicker in public low-voltage supply systems – Equipment with rated
current ≤75 A and subject to conditional connection

FOREWORD
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