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 is available as IEC 60704-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
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

IEC 60704-1:2021 est disponible sous forme de IEC 60704-1:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
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
• Current Stage: PPUB - Publication issued
• Completion Date: 11-Mar-2021

Standards Content (Sample)

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
IEC 60704-1:2021-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC 60704-1:2021 © IEC 2021 – 3 –

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, table type and floor-treatment appliances ............................................................ 21

Figure 5 – Measurement surface – quarter-sphere – with key microphone positions, for

small floor-standing appliances placed against a wall ........................................................... 22

Figure 6 – Measurement surface – parallelepiped – with five or nine microphone

positions for stand-type appliances ....................................................................................... 24

Figure A.1 – Example of standard test table .......................................................................... 34

Figure B.1 – Test enclosure .................................................................................................. 35

Table 1 – Standard deviations of sound power levels ............................................................ 12

Table 2 – Standard deviations for declaration and verification ............................................... 12

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

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International Standard IEC 60704-1 has been prepared by IEC technical committee 59:

Performance of household and similar electrical appliances.

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.
---------------------- Page: 6 ----------------------
IEC 60704-1:2021 © IEC 2021 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
59/753/FDIS 59/762/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all the parts in the IEC 60704 series, 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.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 60704-1:2021 © IEC 2021
INTRODUCTION

Although the noise emitted by household appliances does not generally present a hazard to

the hearing of the operator and other exposed persons, the need for standardization

procedures for the determination of the noise emitted has been recognized for a long time.

Such procedures should be specified, not only for special types of appliances, but also the

principles should be applicable to the majority of appliances in general use.

Generally, the determination of noise levels is only part of a comprehensive testing procedure

covering many aspects of the properties and performances of the appliance. It is therefore

important that the requirements for noise measurements (such as test environment,

instrumentation, and amount of labour involved) be kept at a modest level.

The results of noise measurements are used for many purposes, for example for noise

declaration, as well as for comparing the noise emitted by a specific appliance to the noise

emitted by other appliances of the same family. In other cases, the results are taken as a

basis for engineering action in the development stages of new pieces of equipment, or in

deciding on means for sound insulation. For all purposes, it is important to specify procedures

with known accuracy so that the results of measurements taken by different laboratories can

be compared.

These conditions have, as far as possible, been taken into account in the preparation of this

test code. The acoustic measuring methods are based on those described in
ISO 3743‑1:2010, ISO 3743-2:2018 and ISO 3744:2010.

The adoption of these methods permits the use of hemi-anechoic rooms, special reverberation

test rooms and hard-walled test rooms. The result of the measurements is the sound power

level of the appliance. Within the measuring uncertainty specific to these methods, the results

from the determination under free field conditions over a reflecting plane are equal to those

obtained in reverberant fields.

The use of intensity methods as described in ISO 9614-1:1993, ISO 9614-2:1996, and

ISO 9614-3:2002 is applicable under special conditions, which are described in specific parts

of the IEC 60704-2 series.

This test code is concerned with airborne noise only. In some cases, structure-borne noise,

for example transmitted to the adjoining room, can be of importance.
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IEC 60704-1:2021 © IEC 2021 – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION
OF AIRBORNE ACOUSTICAL NOISE –
Part 1: General requirements
1 Scope

This part of IEC 60704 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60704-2 (all parts), Household and similar electrical appliances – Test code for the

determination of airborne acoustical noise

IEC 60704-3:2019, Household and similar electrical appliances – Test code for the

determination of airborne acoustical noise – Part 3: Procedure for determining and verifying

declared noise emission values

IEC 61260-1:2014, Electroacoustics – Octave-band and fractional-octave-band filters – Part 1:

Specifications
IEC 61672-1:2013, Electroacoustics – Sound level meters – Part 1: Specifications

ISO 3743-1:2010, Acoustics – Determination of sound power levels of noise sources –

Engineering methods for small, movable sources in reverberant fields – Part 1: Comparison

method for hard-walled test rooms
---------------------- Page: 9 ----------------------
– 8 – IEC 60704-1:2021 © IEC 2021

ISO 3743-2:2018, Acoustics – Determination of sound power levels of noise sources using

sound pressure – Engineering methods for small, movable sources in reverberant fields –

Part 2: Methods for special reverberation test rooms

ISO 3744:2010, Acoustics – Determination of sound power levels of noise sources using

sound pressure – Engineering method in an essentially free field over a reflecting plane

ISO 9614-1:1993, Acoustics – Determination of sound power levels of noise sources using

sound intensity – Part 1: Measurement at discrete points

ISO 9614-2:1996, Acoustics – Determination of sound power levels of noise sources using

sound intensity – Part 2: Measurement by scanning

ISO 9614-3:2002, Acoustics – Determination of sound power levels of noise sources using

sound intensity – Part 3: Precision method for measurement by scanning

ISO 6926:2016, Acoustics – Requirements for the performance and calibration of reference

sound sources used for the determination of sound power levels

ISO 12001:1996, Acoustics – Noise emitted by machinery and equipment – Rules for the

drafting and presentation of a noise test code
3 Terms and definitions

For the purposes of this document, the following terms and definitions apply. Terms and

definitions pertinent to the determination of sound power levels can be found in ISO 3743-

1:2010, ISO 3743-2:2018 and ISO 3744:2010.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
measurement time interval

portion or a multiple of an operational period or operational cycle for which the sound power

levels are determined
3.2
operational period

interval of time during which a specified process is accomplished by the appliance under test

(for example, washing or rinsing or drying for a dishwasher)
3.3
operational cycle

specific sequence of operational periods occurring while the appliance under test performs a

complete work cycle

Note 1 to entry: During the operational cycle, each operational period is associated with a specific process that

can occur only once, or can be repeated (for example, washing and rinsing and drying for a dishwasher).

3.4
time history

continuous recording of the sound pressure level (for a distinct microphone position) as a

function of time, which is obtained during one or more operational periods of an operational

cycle
---------------------- Page: 10 ----------------------
IEC 60704-1:2021 © IEC 2021 – 9 –
3.5
reference box

hypothetical right parallelepiped terminating on the reflecting plane(s) on which the noise

source under test is located, that just encloses the source including all the significant sound

radiating components and any test table on which the source is mounted
[SOURCE: ISO 3744:2010, 3.10, modified – The note has been omitted.]
3.6
test enclosure

enclosure used for simulating the typical acoustic built-in or/and mounting conditions

4 Measurement methods and acoustical environments
4.1 General

This document is concerned with objective methods of engineering accuracy grade 2 in

accordance with ISO 12001:1996 for determining sound power levels L , expressed in

decibels (dB), with reference to a sound power of one picowatt (1 pW), of airborne acoustical

noise within the specified frequency range of interest (generally including the octave-bands

with centre frequencies from 125 Hz to 8 000 Hz), and for prescribed operating conditions of

the appliance to be measured.

Methods for determining sound power levels with precision accuracy grade 1 in accordance

with ISO 12001:1996, as specified for example in ISO 3741 and ISO 3745, are not included in

this document. They may, however, be applied if the appropriate test environment and

instrumentation are available.
NOTE 1 The noise values obt
...