IEC 60704-1:2021

Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements

IEC 60704-1:2021 applies to electric appliances (including their accessories or components) for household and similar use, supplied from mains or from batteries.
By "similar use" is understood the use in conditions similar to those found in households, for example in inns, coffee houses, tea rooms, hotels, barber or hairdresser shops, launderettes, etc., if not otherwise specified in the IEC 60704-2 series.
This document does not apply to:
– appliances, equipment, or machines designed exclusively for industrial or professional purposes;
– appliances that are integrated parts of a building or its installations, such as equipment for air conditioning, heating and ventilating (except household fans, cooker hoods, free-standing heating appliances, dehumidifiers, air cleaners, and stand-alone water heaters), oil burners for central heating, pumps for water supply and for sewage systems;
– separate motors or generators and
– appliances exclusively for outdoor use.
For determining and verifying noise emission values declared in product specifications, see IEC 60704-3:2019.
This fourth edition cancels and replaces the third edition published in 2010. This edition constitutes a technical revision.
It includes the following significant changes with respect to the previous edition:
a) update of references (especially to ISO standards);
b) revision of requirements on climatic conditions;
c) revision of requirements on background noise level.

Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 1: Exigences générales

L’IEC 60704-1:2021 s’applique aux appareils électriques pour usages domestiques et analogues, y compris leurs accessoires ou composants, alimentés à partir du réseau ou par piles ou accumulateurs.
L’expression "usages analogues" s’entend des usages dans des conditions similaires à celles des foyers domestiques, par exemple dans les restaurants, cafés, salons de thé, hôtels, salons de coiffure, laveries, etc. sauf spécification contraire dans la série IEC 60704-2.
Le présent document ne s’applique pas
– aux appareils, équipements ou machines conçus exclusivement pour des usages industriels ou professionnels;
– aux appareils qui font partie intégrante d’un bâtiment ou de ses installations, tels que les équipements de climatisation, de chauffage ou de ventilation (à l’exception des ventilateurs domestiques, des hottes de cuisine et des appareils de chauffage indépendants, des déshumidificateurs, des épurateurs d’air et des chauffe-eau indépendants), aux brûleurs à mazout pour le chauffage central, aux pompes pour l’alimentation en eau et pour les systèmes d’eaux usées;
– aux moteurs ou générateurs individuels; et
– aux appareils exclusivement destinés à une utilisation à l’extérieur.
Pour déterminer et vérifier les valeurs d’émission acoustique déclarées dans les spécifications de produit, voir l’IEC 60704-3:2019.
Cette quatrième édition annule et remplace la troisième édition parue en 2010. Cette édition constitue une révision technique.
Elle inclut les modifications majeures suivantes par rapport à l’édition précédente:
a) mise à jour des références (notamment aux normes ISO);
b) révision des exigences relatives aux conditions climatiques;
c) révision des exigences relatives au niveau de bruit de fond.

General Information

• Status: Published
• Publication Date: 10-Mar-2021
• ICS: 13.120 - Domestic safety
• ICS: 97.170 - Body care equipment
• Technical Committee: TC 59 - Performance of household and similar electrical appliances
• Drafting Committee: JWG 2 - TC 59/JWG 2
• Current Stage: PPUB - Publication issued
• Start Date: 02-Apr-2021
• Completion Date: 11-Mar-2021

Relations

• Revises: IEC 60704-1:2010 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60704-1 ®
Edition 4.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Test code for the determination
of airborne acoustical noise –
Part 1: General requirements
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 Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
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
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need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 60704-1 ®
Edition 4.0 2021-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Test code for the determination

of airborne acoustical noise –

Part 1: General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.120; 97.170 ISBN 978-2-8322-9571-7

– 2 – IEC 60704-1:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope and object . 7
1.1 Scope .
1.1.1 General .
1.1.2 Types of noise .
1.1.3 Size of the source .
1.2 Object .
1.3 Measurement uncertainty .
2 Normative references . 8
3 Terms and definitions . 9
4 Measurement methods and acoustical environments . 11
4.1 General . 11
4.2 Direct method . 11
4.3 Comparison method . 12
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 . 13
4.4.3 Environmental conditions . 13
4.5 Measurement uncertainties . 13
4.5.1 General . 13
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification . 13
5 Instrumentation . 14
5.1 Instrumentation for measuring acoustical data . 14
5.2 Instrumentation for measuring climatic conditions . 14
5.3 Instrumentation for measuring operating conditions . 14
6 Operation and location of appliances under test . 15
6.1 Equipping and pre-conditioning of appliances . 15
6.2 Supply of electric energy and of water or gas . 15
6.3 Climatic conditions . 16
6.4 Loading and operating of appliances during tests . 16
6.5 Location and mounting of appliances . 17
7 Measurement of sound pressure levels . 19
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) . 19
7.2 Microphone array and RSS location in hard-walled test rooms . 19
7.3 Microphone array and RSS location in special reverberation test rooms . 29
7.4 Measurements . 29
8 Calculation of sound pressure and sound power levels . 30
8.1 General . 30
8.2 Corrections for background noise levels . 30
8.3 Corrections for the test environment . 31
8.4 Calculation of sound pressure level averaged over the microphone positions . 31
8.5 Calculation of sound power levels with the comparison method . 31

8.6 Calculation of sound power levels in free field conditions over a reflecting
plane . 32
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms . 32
9 Information to be recorded . 33
9.1 General data . 33
9.2 Description of appliance under test . 33
9.3 Measurement method . 33
9.4 Acoustical test environment . 34
9.5 Instrumentation . 34
9.6 Equipment and pre-conditioning of appliance under test . 34
9.7 Electric supply, water supply, etc. . 34
9.8 Climatic conditions . 34
9.9 Operation of the appliance under test . 35
9.10 Location and mounting of the appliance under test. 35
9.11 Microphone array . 35
9.12 Measurement data . 35
9.13 Calculated sound pressure and sound power levels . 36
9.14 Reporting . 36
10 Information to be reported . 36
10.1 General data . 36
10.2 Appliance under test . 36
10.3 Test conditions for the appliance . 36
10.4 Acoustical data . 37
Annex A (normative) Standard test table . 38
Annex B (normative) Test enclosure . 39
Annex C (informative) Guidelines for the design of simple test rooms with essentially

free field conditions. 40
Bibliography . 41

Figure 1 – Measurement surface – parallelepiped – with key microphone positions, for
floor free-standing appliances . 22
Figure 2 – Measurement surface – parallelepiped – with key microphone positions, for
floor standing appliances placed against a wall . 23
Figure 3 – Measurement surface – parallelepiped – with key microphone positions, for

high floor-standing appliances placed against a wall . 24
Figure 4 – Measurement surface – hemisphere – with key microphone positions, for
hand-held, table type and floor-treatment appliances . 25
Figure 5 – Measurement surface – quarter-sphere – with key microphone positions, for
small floor-standing appliances placed against a wall . 26
Figure 6 – Measurement surface – parallelepiped – with five or nine microphone

positions for stand-type appliances . 28
Figure A.1 – Example of standard test table . 38
Figure B.1 – Test enclosure . 39

Table 1 – Standard deviations of sound power levels . 14
Table 2 – Standard deviations for declaration and verification . 14

– 4 – IEC 60704-1:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION
OF AIRBORNE ACOUSTICAL NOISE –

Part 1: General requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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in the subjec
...

IEC 60704-1 ®
Edition 4.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 1: Exigences générales
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.

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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 online collection - oc.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. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
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Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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need further assistance, please contact the Customer Service
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IEC 60704-1 ®
Edition 4.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120; 97.170 ISBN 978-2-8322-9515-1

– 2 – IEC 60704-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Measurement methods and acoustical environments . 9
4.1 General . 9
4.2 Direct method . 9
4.3 Comparison method . 10
4.4 Acoustical environments . 10
4.4.1 General requirements and criterion for adequacy of the test
environment . 10
4.4.2 Criterion for background noise level . 11
4.4.3 Environmental conditions . 11
4.5 Measurement uncertainties . 11
4.5.1 General . 11
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification . 11
5 Instrumentation . 12
5.1 Instrumentation for measuring acoustical data . 12
5.2 Instrumentation for measuring climatic conditions . 12
5.3 Instrumentation for measuring operating conditions . 12
6 Operation and location of appliances under test . 13
6.1 Equipping and pre-conditioning of appliances . 13
6.2 Supply of electric energy and of water or gas . 13
6.3 Climatic conditions . 14
6.4 Loading and operating of appliances during tests . 14
6.5 Location and mounting of appliances . 15
7 Measurement of sound pressure levels . 17
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) . 17
7.2 Microphone array and RSS location in hard-walled test rooms . 25
7.3 Microphone array and RSS location in special reverberation test rooms . 25
7.4 Measurements . 25
8 Calculation of sound pressure and sound power levels . 26
8.1 General . 26
8.2 Corrections for background noise levels . 26
8.3 Corrections for the test environment . 27
8.4 Calculation of sound pressure level averaged over the microphone positions . 27
8.5 Calculation of sound power levels with the comparison method . 27
8.6 Calculation of sound power levels in free field conditions over a reflecting
plane . 28
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms . 28
9 Information to be recorded . 29
9.1 General data . 29

9.2 Description of appliance under test . 29
9.3 Measurement method . 29
9.4 Acoustical test environment . 29
9.5 Instrumentation . 30
9.6 Equipment and pre-conditioning of appliance under test . 30
9.7 Electric supply, water supply, etc. . 30
9.8 Climatic conditions . 30
9.9 Operation of the appliance under test . 30
9.10 Location and mounting of the appliance under test. 30
9.11 Microphone array . 31
9.12 Measurement data . 31
9.13 Calculated sound pressure and sound power levels . 31
9.14 Reporting . 31
10 Information to be reported . 32
10.1 General data . 32
10.2 Appliance under test . 32
10.3 Test conditions for the appliance . 32
10.4 Acoustical data . 33
Annex A (normative) Standard test table . 34
Annex B (normative) Test enclosure . 35
Annex C (informative) Guidelines for the design of simple test rooms with essentially
free field conditions. 36
Bibliography . 37

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 3 – Measurement surface – parallelepiped – with key microphone positions, for
high floor-standing appliances placed against a wall . 20
Figure 4 – Measurement surface – hemisphere – with key microphone positions, for
hand-held, ta
...