IEC TS 61000-3-5:2009

Electromagnetic compatibility (EMC) - Part 3-5: Limits - Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 75 A

IEC/TS 61000-3-5:2009 deals with emission of disturbances due to voltage fluctuations and flicker. The recommendations in this Technical Specification are applicable to electrical and electronic equipment that has a rated input current exceeding 75 A per phase and is intended to be connected to a public low-voltage a.c. distribution system. Recommendations that specify information enabling a supply authority, manufacturer, or consumer to assess equipment are given in Annex A. This second edition cancels and replaces IEC 61000-3-5, published as Technical Report type 2 in 1994 and constitutes a technical revision. It includes the following significant technical changes with respect to the previous edition: the whole document and the title have been modified to eliminate any conflict with the published IEC 61000-3-11. The contents of the corrigenda of September 2009 and May 2010 have been included in this copy.

Compatibilité électromagnétique (CEM) - Partie 3-5: Limites - Limitation des fluctuations de tension et du flicker dans les réseaux basse tension pour les équipements ayant un courant appelé supérieur à 75 A

La CEI/TS 61000-3-5:2009 porte sur l'émission de perturbations de type fluctuations de tension et papillotement. Les recommandations figurant dans cette Spécification Technique sont applicables aux appareils électriques et électroniques dont le courant assigné d'entrée est supérieur à 75 A par phase et qui sont destinés à être raccordés à un réseau public de distribution basse tension. Les recommandations qui précisent les informations nécessaires pour permettre à une compagnie d'électricité, un constructeur ou un consommateur d'évaluer un matériel sont données dans l'Annexe A. Cette deuxième édition annule et remplace la CEI 61000-3-5, publiée comme Rapport Technique de type 2 en 1994 et constitue une révision technique. Elle inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: le document dans son ensemble et le titre ont été modifiés pour éliminer tout conflit avec la CEI 61000-3-11 publiée. Le contenu des corrigenda de septembre 2009 et mai 2010 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 07-Jul-2009
• ICS: 11.040.50 - Radiographic equipment
• ICS: 33.100.10 - Emission
• Technical Committee: SC 77A - EMC - Low frequency phenomena
• Drafting Committee: WG 2 - TC 77/SC 77A/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 08-Jul-2009
• Completion Date: 31-Oct-2009

Relations

• Corrected By: IEC TS 61000-3-5:2009/COR1:2009 - Corrigendum 1 - Electromagnetic compatibility (EMC) - Part 3-5: Limits - Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 75 A
• Effective Date: 05-Sep-2023
• Corrected By: IEC TS 61000-3-5:2009/COR2:2010 - Corridendum 2 - Electromagnetic compatibility (EMC) - Part 3-5: Limits - Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 75 A
• Effective Date: 05-Sep-2023

Overview

IEC TS 61000-3-5:2009 is a Technical Specification issued by the International Electrotechnical Commission (IEC) focusing on Electromagnetic Compatibility (EMC). This part, under the broader IEC 61000 series, specifically defines limits for voltage fluctuations and flicker in low-voltage power supply systems caused by equipment with rated current greater than 75 A per phase. Its aim is to minimize disturbances in public low-voltage AC distribution systems from large electrical and electronic loads.

This second edition updates and replaces the 1994 Technical Report, aligning the title and content to avoid conflicts with IEC 61000-3-11, which covers equipment with current ratings up to 75 A. It integrates corrigenda from 2009 and 2010, making it a crucial reference for manufacturers, supply authorities, and consumers to assess and ensure compliance concerning flicker emissions.

Key Topics

• Scope and Applicability
  IEC TS 61000-3-5 applies to equipment rated above 75 A per phase connected to public low-voltage AC distribution networks. It addresses emission limits for voltage fluctuations and flicker which may impair other users or systems.

• Voltage Fluctuation and Flicker Limits
  The standard recommends specific limits for relative voltage changes as follows:

  • Steady state voltage change (d_c)** should not exceed 3.3%.
  • Maximum voltage change (d_max) varies by use-case:
    • 4% maximum without conditions.
    • 6% maximum for equipment with automated switching occurring more than twice per day, incorporating delayed restarts.
    • 7% maximum for equipment manually switched no more than twice daily or attended during operation, with appropriate restart delays.

• Assessment Methods
  It recommends measuring disturbance levels before and after connecting major loads and performing detailed system studies to evaluate equipment impact regarding system impedance and operational conditions.

• Consumer and Supplier Interaction
  The standard underscores the importance of acquiring detailed information from consumers via a questionnaire (Annex A) to facilitate evaluation of potential flicker emissions before connection approval.

• Complementary Standards
  It references essential EMC documents such as IEC 61000-3-3 (limits for equipment ≤16 A) and IEC 61000-3-11 (limits for equipment ≤75 A), guiding consistent assessment practices across varying equipment sizes and impacts.

Applications

• Power Quality Management
  Utilities and distribution network operators use IEC TS 61000-3-5 to regulate and mitigate voltage flicker and fluctuations that degrade power quality, thereby protecting sensitive equipment and ensuring network stability.

• Equipment Design and Manufacture
  Manufacturers designing large electrical and electronic equipment must ensure compliance with these limits to reduce flicker emissions, supporting grid compatibility and avoiding operational restrictions or refusal of connection.

• Installation and System Planning
  Engineers and system planners assess the impact of installing high-current loads on public low-voltage networks by applying the guidelines to maintain electromagnetic compatibility and avoid power interruptions or disturbances to other consumers.

• Regulatory Compliance and Certification
  This specification assists certification bodies and supply authorities in defining requirements for conditional connection, ensuring that equipment meets flicker and voltage change limits before integration into low-voltage public systems.

Related Standards

• IEC 61000-3-3: Addresses limits for voltage changes, fluctuations, and flicker for equipment with rated current up to 16 A, complementing the scope of IEC TS 61000-3-5 for higher current devices.

• IEC 61000-3-11:2000: Defines flicker and voltage fluctuation limits for equipment with rated currents up to 75 A, bridging the gap between low-current equipment and larger loads governed by IEC TS 61000-3-5.

• IEC 61000-3-2: Specifies harmonic current emission limits for equipment with input current ≤16 A, relevant for harmonic distortion management alongside flicker control.

• IEC 60050(161): Provides essential electromagnetic compatibility terminology and definitions referenced throughout the series.

Conclusion

IEC TS 61000-3-5:2009 plays a critical role in maintaining electromagnetic compatibility within low-voltage power systems impacted by high-current equipment. Its clear limits on voltage fluctuations and flicker help supply authorities, manufacturers, and consumers collaboratively manage power quality, prevent disturbances, and ensure safe and reliable electricity distribution. Integrating this Technical Specification in equipment design, assessment, and connection processes optimizes performance and supports sustainable electrical infrastructure worldwide.

Standards Content (Sample)

IEC/TS 61000-3-5 ®
Edition 2.0 2009-07
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Electromagnetic compatibility (EMC) –
Part 3-5: Limits – Limitation of voltage fluctuations and flicker in low-voltage
power supply systems for equipment with rated current greater than 75 A

Compatibilité électromagnétique (CEM) –
Partie 3-5: Limites – Limitation des fluctuations de tension et du flicker dans les
réseaux basse tension pour les équipements ayant un courant appelé supérieur
à 75 A
IEC/TS 61000-3-5:2009
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IEC/TS 61000-3-5 ®
Edition 2.0 2009-07
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Electromagnetic compatibility (EMC) –
Part 3-5: Limits – Limitation of voltage fluctuations and flicker in low-voltage
power supply systems for equipment with rated current greater than 75 A

Compatibilité électromagnétique (CEM) –
Partie 3-5: Limites – Limitation des fluctuations de tension et du flicker dans les
réseaux basse tension pour les équipements ayant un courant appelé supérieur
à 75 A
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
L
CODE PRIX
ICS 33.100.10 ISBN 978-2-88910-371-3
– 2 – TS 61000-3-5 © IEC:2009
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Equipment assessment.6
4.1 General .6
4.2 Information from a consumer.7
4.3 Evaluation of equipment with a rated input current exceeding 75 A per phase .7
5 Recommended voltage change and flicker limits.7
5.1 Recommended voltage change limits.7
5.2 Recommended flicker limits.8

Annex A (informative) Questionnaire to facilitate an accurate evaluation of flicker
emissions .9
Annex B (informative) Explanation of 5.2 .11

TS 61000-3-5 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 3-5: Limits –
Limitation of voltage fluctuations and
flicker in low-voltage power supply systems for
equipment with rated current greater than 75 A

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
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The main task of IEC technical committees is to prepare International Standards. In
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• the required support cannot be obtained for the publication of an International Standard,
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• the subject is still under technical development or where, for any other reason, there is the
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Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC/TS 61000-3-5, which is a technical specification, has been prepared by subcommittee
77A: Low frequency phenomena of IEC technical committee 77: Electromagnetic compatibility.

– 4 – TS 61000-3-5 © IEC:2009
This second edition cancels and replaces IEC 61000-3-5, published as Technical Report
type 2 in 1994 and constitutes a technical revision.
It includes the following significant technical changes with respect to the previous edition: the
whole document and the title have been modified to eliminate any conflict with the published
IEC 61000-3-11.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
77A/681/DTS 77A/693/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The contents of the corrigenda of September 2009 and May 2010 have been included in this
copy.
TS 61000-3-5 © IEC:2009 – 5 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits
(in so far as they do not fall under the responsibility of product committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts published either as International Standards
or as technical specifications or technical reports, some of which have already been published
as sections. Others will be published with the part number followed by a dash and a second
number identifying the subdivision (example: 61000-6-1).
IEC/TS 61000-3-5
This Technical Specification is presented as an informative document as it is already a
requirement, in most countries, for equipment having a rated input current exceeding 75 A per
phase to be subject to assessment and connection by the public supply network operator.
Therefore, it is not intended, at the time of publication, to be converted into an International
Standard.
– 6 – TS 61000-3-5 © IEC:2009
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 3-5: Limits –
Limitation of voltage fluctuations and
flicker in low-voltage power supply systems for
equipment with rated current greater than 75 A

1 Scope
This part of IEC 61000 deals with emission of disturbances due to voltage fluctuations and
flicker.
The recommendations in this Technical Specification are applicable to electrical and
electronic equipment that has a rated input current exceeding 75 A per phase and is intended
to be connected to a public low-voltage a.c. distribution system.
Recommendations that specify information enabling a supply authority, manufacturer, or
consumer to assess equipment are given in Annex A.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050(161), International Electrotechnical Vocabulary – Chapter 161: Electromagnetic
compatibility
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤16 A per phase)
IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment
with rated current ≤16 A per phase and not subject to conditional connection
IEC 61000-3-11:2000, 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
3 Terms and definitions
For the purposes of this document the terms and definitions of IEC 61000-3-2, IEC 61000-3-3,
IEC 61000-3-11 and IEC 60050(161) apply.
4 Equipment assessment
4.1 General
Methods of flicker assessment for different types of voltage fluctuations are described in
IEC 61000-3-3 and IEC 61000-3-11.

TS 61000-3-5 © IEC:2009 – 7 –
It is recommended that the disturbance levels present in the electricity supply are measured
before and after the connection of a new load which is critical in any respect. The assessment
method and data used should be verified.
An item of equipment having a rated input-current exceeding 75 A per phase, should comply
with the limits for all relevant phase-to-neutral voltages given in Clause 5.
4.2 Information from a consumer
When a consumer enquires about connection of a major load to a low voltage public supply
network he should, on request, provide information to enable assessment of the possible
disturbances caused by the load, otherwise connection may be refused.
The basic information to facilitate the assessment of equipment is recommended in the
questionnaire contained in Annex A. This questionnaire should be completed by the user, or
his authorized installation engineer, when connections of electrical loads to low-voltage public
power supply networks require special authorization.
The completed questionnaire should be given to the electricity supplier well in advance of
purchase and installation of the equipment to be connected.
4.3 Evaluation of equipment with a rated input current exceeding 75 A per phase
For equipment with a rated input current exceeding 75 A, a detailed system study is
recommended in order to facilitate conditional connection.
The equipment should be evaluated against the actual system impedance. It is recommended
that IEC 61000-3-3 and IEC 61000-3-11 voltage change limits for d and d , given in
max c
Clause 5, are applied.
5 Recommended voltage change and flicker limits
5.1 Recommended voltage change limits
The following limits are recommended to be applicable to equipment having ratings greater
than 75 A per phase:
• the relative steady state voltage change, d , should not exceed 3,3 %;
c
• the maximum relative voltage change, d , should not exceed
max
a) 4 % without additional conditions;
b) 6 % for equipment with automatic switching more than twice per day and that has a
delayed restart (the order of magnitude of the delay being of a few minutes) or that has
manual restart after power supply interruption;
NOTE The cycling frequency is further limited by the P and P limit. For example: a d of 6 % with
max
st lt
rectangular voltage change characteristic twice per hour gives a P of about 0,65.
lt
c) 7 % for equipment which is attended whilst in use, or is switched on automatically, or
is intended to be switched on manually no more than twice per day and has a delayed
restart (the delay being not less than a few tens of seconds) or manual restart after a
power supply interruption.
In the case of equipment incorporating multiple loads, limits b) and c) should only apply if
there is delayed or manual restart after a power supply interruption. For all equipment with
automatic switching, that is energised immediately on restoration of supply after a power
supply interruption, a) should apply. For all equipment with manual switching, limits b) or c)
should apply, depending on the rate of switching.

– 8 – TS 61000-3-5 © IEC:2009
P and P requirements should not be applicable to voltage changes caused by manual
st lt
switching.
The limits should not be applicable to emergency switching or emergency interruptions.
5.2 Recommended flicker limits
The recommended limit of P for a particular item of equipment is calculated by application of
st
Equation (1):
1/ 3
P =()S /S Equation (1)
st_LIMIT L TR
within the range 0,6 < P < 1.
st
NOTE 1 All P values that are calculated by application of Equation (1), and are less than 0,6, should be
st_LIMIT
set to 0,6.
where
S is the rated apparent power of the load to be connected, and
L
S is the rated apparent power of the feeding MV/LV transformer.
TR
NOTE 2 P and P are defined in IEC 61000-3-3.
st lt
The recommended limit of P for a particular item of equipment is determined by Equation (2):
lt
1/ 3
()
P = 0,65 S /S Equation (2)
lt_LIMIT L TR
i.e. P = 0,65 P
lt_LIMIT st_LIMIT
NOTE 3 The calculated flicker limits are recommended values, as the existing flicker level in the associated MV
network, the compatibility level of the low-voltage network and any existing utility regulations should be taken into
account.
TS 61000-3-5 © IEC:2009 – 9 –
Annex A
(informative)
Questionnaire to facilitate an accurate
evaluation of flicker emissions

A.1 Main purpose of the equipment
Concise description of the equipment:
Type of equipment, with estimated mechanical and thermal ratings, as applicable.
A.2 Electrical characteristics of the equipment
A.2.1 Rating
Voltage . . …
Number of phases .
Apparent power rating…………………………
Power factor . ……….
Starting current .
Power factor during start………………………
Rating of the largest motor ………………….
Largest switched thermal load …………….
Capacitive load ………. ……………………
Maximum permissible system impedance
to give compliance with the limits in Clause 5.…………….
The largest production of harmonics should be specified in amperes for each harmonic in an
appendix. For linear loads, this information is not necessary.
A.2.2 Effect on supply quality
Does the proposed load have any other characteristics, which could affect the supply quality?
In particular
a) Does it produce transients?  YES NO
b) Does it produce voltage unbalance?  YES NO
c) Does it produce a d.c. component in the supply?  YES NO
d) Does it produce commutation notches, or extra zero crossings?  YES NO
e) Does it produce harmonics, or other frequencies?
YES NO
– 10 – TS 61000-3-5 © IEC:2009
f) Does it inject any frequencies into the supply system for signalling purposes?  YES NO
g) Can the equipment generate back into the supply system?
YES NO
A.3 Work cycle
If the equipment has a varying load, the variation should be described generally (that is step
or sinusoidal) and in detailed terms (that is depth and rate of occurrence), together with any
information of value in the assessment of possible disturbance to the power supply.
Are the electric motors working with constant or varying torque?
If the torque is variable, state the variation frequency .
Number of starts per day/per hour .
Max. load . . _. kVA
Min. load . . _. kVA
Typical load variation frequency:
Time of the day at which switching, motor starts, or major variations of load are performed:
Type of power control:
A.4 limitation
Disturbance
Measures taken to limit disturbances caused by the equipment should be specified.
A.5 Compliance with standards and rules
The equipment manufacturer may specify any standards and rules for electrical disturbances
with which the
...