IEC 60704-2-9:2024
(Main)Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-9: Particular requirements for electric hair care appliances
Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-9: Particular requirements for electric hair care appliances
IEC 60704-2-9:2024 is available as IEC 60704-2-9:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60704-2-9:2024 applies to electric hand-held hairdryers for household and similar use supplied from mains, which operate with a flow of air. These particular requirements can also be applied to analogous electrically operated devices such as hairstyling appliances, which produce the airflow by a fan. Helmet-type hairdryers are excluded from this document. This document does not apply to hair care appliances with radiant heating. For determining and verifying noise emission values declared in product specifications, see IEC 60704-3. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Alignment with IEC 60704-1:2021.
This part 2-9 is intended to be used in conjunction with the fourth edition of IEC 60704-1:2021: Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements.
Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 2-9: Exigences particulières pour les appareils électriques destinés aux soins des cheveux
IEC 60704-2-9:2024 est disponible sous forme de IEC 60704-2-9:2024 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60704-2-9:2024 s’applique aux sèche-cheveux électriques tenus à la main pour usages domestiques et analogues, alimentés à partir du réseau et fonctionnant avec un flux d’air. Ces exigences particulières peuvent également s’appliquer aux appareils électriques analogues tels que les appareils de coiffure dont le flux d’air est produit par un ventilateur. Les casques sèche-cheveux sont exclus du présent document. Le présent document ne s’applique pas aux appareils destinés aux soins des cheveux à chauffage rayonnant. Pour la détermination et la vérification des valeurs d'émission sonore déclarées dans les spécifications de produit, voir l'IEC 60704-3. Cette deuxième édition annule et remplace la première édition parue en 2003. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) Alignement sur l’IEC 60704-1:2021.
Cette partie 2-9 est destinée à être utilisée conjointement avec la quatrième édition de l’IEC 60704-1:2021: Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 1: Exigences générales.
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IEC 60704-2-9 ®
Edition 2.0 2024-06
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 60704-2-9 ®
Edition 2.0 2024-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.170, 17.140.20 ISBN 978-2-8322-9158-0
– 2 – IEC 60704-2-9:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 7
3 Terms and definitions . 8
4 Measurement methods and acoustical environments . 8
5 Instrumentation . 9
6 Operation and location of appliances under test . 9
7 Measurement of sound pressure levels . 11
9 Information to be recorded . 12
10 Information to be reported . 12
Annexes . 13
Bibliography . 14
Table 1 – Standard deviations of sound power levels . 9
Table 2 – Standard deviations for declaration and verification . 9
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-9: Particular requirements for electric hair care appliances
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
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60704-2-9:2003. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC 60704-2-9:2024 RLV © IEC 2024
IEC 60704-2-9 has been prepared by subcommittee 59L: Small household appliances, of IEC
technical committee 59: Performance of household electrical appliances. It is an International
Standard.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Alignment with IEC 60704-1:2021.
The text of this International Standard is based on the following documents:
Draft Report on voting
59L/239/CDV 59L/253/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60704 series, published under the general title Household and
similar electrical appliances – Test code for the determination of airborne acoustical noise, can
be found on the IEC website.
This part 2-9 is intended to be used in conjunction with the fourth edition of IEC 60704-1:2021:
Household and similar electrical appliances – Test code for the determination of airborne
acoustical noise – Part 1: General requirements.
The relevant text of IEC 60704-1:2021 as amended by this standard establishes the test code
for electric hair care appliances.
This document supplements or modifies the corresponding clauses in IEC 60704-1:2021. When
a particular subclause of IEC 60704-1:2021 is not mentioned in this document, that subclause
applies as far as reasonable. Where this standard states "addition", "modification" or
"replacement", the relevant requirements, test specification or explanatory matter in
IEC 60704-1:2021 is adapted accordingly.
Subclauses or figures which are additional to those in IEC 60704-1:2021 are numbered starting
from 101. Additional annexes are lettered AA, BB, etc.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
– 6 – IEC 60704-2-9:2024 RLV © IEC 2024
INTRODUCTION
The measuring conditions specified in this document provide for sufficient accuracy in
determining the noise emitted and comparing the results of measurements taken by different
laboratories, whilst simulating as far as possible the practical use of hair care appliances.
It is recommended to consider the determination of noise levels as part of a comprehensive
testing procedure covering many aspects of the properties and performance of electric hair care
appliances.
NOTE As stated in the introduction to IEC 60704-1, this test code is concerned with airborne noise only.
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-9: Particular requirements for electric hair care appliances
1 Scope and object
This clause of Part 1 is applicable except as follows:
1.1 Scope
1.1.1 General
Replacement:
This part of IEC 60704 applies to electric hand-held hairdryers for household and similar use
supplied from mains, which operate with a flow of air.
These particular requirements can also be applied to analogous electrically operated devices
such as hairstyling appliances, which produce the airflow by a fan.
Helmet-type hairdryers are excluded from this document.
This document does not apply to hair care appliances with radiant heating.
1.1.2 Types of noise
Replacement:
ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring noise emitted by electric
hairdryers.
1.1.3 Size of the source
Replacement:
The method specified in ISO 3744 is applicable to noise sources of any size (limited only by
available test environment). When applying ISO 3743-1 and ISO 3743-2, care should be taken
that the maximum size of the electric hair care appliance under test fulfils the requirements
specified in 1.3 of ISO 3743-1 and ISO 3743-2.
1.2 Object
Addition:
Requirements for the declaration of noise emission values are not within the scope of this
standard.
NOTE For determining and verifying noise emission values declared in product specifications,
see IEC 60704-3.
– 8 – IEC 60704-2-9:2024 RLV © IEC 2024
2 Normative references
This clause of Part 1 is
...
IEC 60704-2-9 ®
Edition 2.0 2024-06
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60704-2-9:2024 includes the content of the references made to
IEC 60704-1:2021
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
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 Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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.
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containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60704-2-9 ®
Edition 2.0 2024-06
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60704-2-9:2024 includes the content of the references made to
IEC 60704-1:2021
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.170, 17.140.20 ISBN 978-2-8322-9163-4
– 2 – IEC 60704-2-9:2024 EXV © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION to 60704-1:2021 . 7
INTRODUCTION to 60704-2-9:2024 . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Measurement methods and acoustical environments . 10
4.1 General . 10
4.2 Direct method . 11
4.3 Comparison method . 11
4.4 Acoustical environments . 12
4.4.1 General requirements and criterion for adequacy of the test
environment . 12
4.4.2 Criterion for background noise level . 12
4.4.3 Environmental conditions . 12
4.5 Measurement uncertainties . 12
4.5.1 General . 12
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification . 13
5 Instrumentation . 13
5.1 Instrumentation for measuring acoustical data . 13
5.2 Instrumentation for measuring climatic conditions . 13
5.3 Instrumentation for measuring operating conditions . 13
6 Operation and location of appliances under test . 14
6.1 Equipping and pre-conditioning of appliances . 14
6.2 Supply of electric energy and of water or gas . 14
6.3 Climatic conditions . 15
6.4 Loading and operating of appliances during tests . 15
6.5 Location and mounting of appliances . 15
7 Measurement of sound pressure levels . 18
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) . 18
7.2 Microphone array and RSS location in hard-walled test rooms . 21
7.3 Microphone array and RSS location in special reverberation test rooms . 21
7.4 Measurements . 22
8 Calculation of sound pressure and sound power levels . 22
8.1 General . 22
8.2 Corrections for background noise levels . 22
8.3 Corrections for the test environment . 23
8.4 Calculation of sound pressure level averaged over the microphone positions . 23
8.5 Calculation of sound power levels with the comparison method . 24
8.6 Calculation of sound power levels in free field conditions over a reflecting
plane . 24
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms . 25
9 Information to be recorded . 25
9.1 General data . 25
9.2 Description of appliance under test . 25
9.3 Measurement method . 26
9.4 Acoustical test environment . 26
9.5 Instrumentation . 26
9.6 Equipment and pre-conditioning of appliance under test . 26
9.7 Electric supply, water supply, etc. . 26
9.8 Climatic conditions . 26
9.9 Operation of the appliance under test . 27
9.10 Location and mounting of the appliance under test. 27
9.11 Microphone array . 27
9.12 Measurement data . 27
9.13 Calculated sound pressure and sound power levels . 28
9.14 Reporting . 28
10 Information to be reported . 28
10.1 General data . 28
10.2 Appliance under test . 28
10.3 Test conditions for the appliance . 28
10.4 Acoustical data . 29
Annex A (normative) Standard test table . 30
Annex B (normative) Test enclosure . 31
Annex C (informative) Guidelines for the design of simple test rooms with essentially
free field conditions. 32
Bibliography . 33
Figure 1 – Measurement surface – parallelepiped – with key microphone positions, for
floor free-standing appliances . 18
Figure 2 – Measurement surface – parallelepiped – with key microphone positions, for
floor standing appliances placed against a wall . 19
Figure 4 – Measurement surface – hemisphere – with key microphone positions, for
hand-held, table type and floor-treatment appliances . 20
Figure B.1 – Test enclosure . 31
Table 1 – Standard deviations of sound power levels . 13
Table 2 – Standard deviations for declaration and verification . 13
– 4 – IEC 60704-2-9:2024 EXV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-9: Particular requirements for electric hair care appliances
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 may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent p
...
IEC 60704-2-9 ®
Edition 2.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
Appareils électrodomestiques et analogues – Code d'essai pour la détermination
du bruit aérien –
Partie 2-9: Exigences particulières pour les appareils électriques destinés aux
soins des cheveux
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
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IEC Secretariat Tel.: +41 22 919 02 11
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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 IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.
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details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
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(IEV) online.
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IEC 60704-2-9 ®
Edition 2.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-9: Particular requirements for electric hair care appliances
Appareils électrodomestiques et analogues – Code d'essai pour la
détermination du bruit aérien –
Partie 2-9: Exigences particulières pour les appareils électriques destinés aux
soins des cheveux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.170, 17.140.20 ISBN 978-2-8322-9000-2
– 2 – IEC 60704-2-9:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
3 Terms and definitions . 6
4 Measurement methods and acoustical environments . 6
5 Instrumentation . 8
6 Operation and location of appliances under test . 8
7 Measurement of sound pressure levels . 9
9 Information to be recorded . 10
10 Information to be reported . 10
Annexes . 11
Annex A (normative) Standard test table . 11
Bibliography . 12
Table 1 – Standard deviations of sound power levels . 7
Table 2 – Standard deviations for declaration and verification . 7
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-9: Particular requirements for electric hair care appliances
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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IEC 60704-2-9 has been prepared by subcommittee 59L: Small household appliances, of IEC
technical committee 59: Performance of household electrical appliances. It is an International
Standard.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Alignment with IEC 60704-1:2021.
– 4 – IEC 60704-2-9:2024 © IEC 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
59L/239/CDV 59L/253/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60704 series, published under the general title Household and
similar electrical appliances – Test code for the determination of airborne acoustical noise, can
be found on the IEC website.
This part 2-9 is intended to be used in conjunction with the fourth edition of IEC 60704-1:2021:
Household and similar electrical appliances – Test code for the determination of airborne
acoustical noise – Part 1: General requirements.
The relevant text of IEC 60704-1:2021 as amended by this standard establishes the test code
for electric hair care appliances.
This document supplements or modifies the corresponding clauses in IEC 60704-1:2021. When
a particular subclause of IEC 60704-1:2021 is not mentioned in this document, that subclause
applies as far as reasonable. Where this standard states "addition", "modification" or
"replacement", the relevant requirements, test specification or explanatory matter in
IEC 60704-1:2021 is adapted accordingly.
Subclauses or figures which are additional to those in IEC 60704-1:2021 are numbered starting
from 101. Additional annexes are lettered AA, BB, etc.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
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