Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-8: Particular requirements for electric shavers, hair clippers or trimmers

IEC 60704-2-8:2020 is available as IEC 60704-2-8:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60704-2-8:2020 applies to electric shavers, clippers or trimmers for domestic and similar use, supplied from mains or secondary batteries or primary batteries. The term "similar use" is understood to mean the use in hotels, hospitals, shops, offices, etc. This document does not apply to shavers, clippers or trimmers that are powered by means other than electrical, for example by a spring-device. If possible, this document can also be applied to analogous electrically operated devices, such as depilating devices. This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) the scope of the products has been enlarged to include hair clippers and trimmers;
b) it includes standard deviations of sound power levels in 1.1.3;
c) the normative references have been updated (ISO 3744:2010 and ISO 3743-1:2010);
d) it is adjusted with respect to IEC 60704-1:2010;
e) it has been updated to comply with the ISO/IEC Directives, Part 2.
This Part 2-8 is intended to be used in conjunction with third edition (2010) of IEC 60704-1, Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements. This Part 2-8 supplements or modifies the corresponding clauses in IEC 60704-1:2010, so as to establish the test code for shavers, hair clippers or trimmers.

Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 2-8: Exigences particulières pour les rasoirs et les tondeuses à barbe ou à cheveux électriques

IEC 60704-2-8:2020 est disponible sous forme de IEC 60704-2-8:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60704-2-8:2020 s'applique aux rasoirs et aux tondeuses à barbe ou à cheveux électriques pour usages domestiques et analogues, alimentés à partir du réseau ou par piles ou accumulateurs. Le terme "usages analogues" couvre les usages dans les hôtels, hôpitaux, magasins, bureaux, etc. Le présent document ne s'applique pas aux rasoirs et aux tondeuses à barbe ou à cheveux qui ne sont pas alimentés par des moyens électriques (mais par un dispositif à ressort, par exemple). Si possible, le présent document peut également être appliqué aux appareils électriques analogues tels que les appareils d'épilation. Cette deuxième édition annule et remplace la première édition parue en 1997. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) le domaine d'application des produits a été élargi aux tondeuses à barbe et à cheveux;
b) des écarts-types sont fournis pour les niveaux de puissance acoustique au 1.1.3;
c) les références normatives ont été mises à jour (ISO 3744:2010 et ISO 3743-1:2010);
d) le présent document a fait l'objet de réajustements par rapport à l'IEC 60704-1:2010;
e) le présent document a été mis à jour pour être conforme aux Directives ISO/IEC, Partie 2.
La présente Partie 2-8 est destinée à être utilisée conjointement avec la troisième édition (2010) de l'IEC 60704-1, Appareils électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien - Partie 1: Exigences générales. La présente Partie 2-8 complète ou modifie les articles correspondants de l’IEC 60704-1:2010, de façon à constituer le code d'essai pour les rasoirs et les tondeuses à barbe ou à cheveux.

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Published
Publication Date
08-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
09-Mar-2020
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IEC 60704-2-8
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –

Part 2-8: Particular requirements for electric shavers, hair clippers or trimmers

Appareils électrodomestiques et analogues – Code d'essai pour la détermination
du bruit aérien –
Partie 2-8: Exigences particulières pour les rasoirs et les tondeuses à barbe
ou à cheveux électriques
IEC 60704-2-8:2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60704-2-8
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –

Part 2-8: Particular requirements for electric shavers, hair clippers or trimmers

Appareils électrodomestiques et analogues – Code d'essai pour la
détermination du bruit aérien –
Partie 2-8: Exigences particulières pour les rasoirs et les tondeuses à barbe
ou à cheveux électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.20; 97.170 ISBN 978-2-8322-7908-3

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 60704-2-8:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope and object ............................................................................................................. 6

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Measurement methods and acoustical environments ....................................................... 8

5 Instrumentation ................................................................................................................ 8

6 Operation and location of appliances under test .............................................................. 8

7 Measurement of sound pressure levels .......................................................................... 12

8 Calculation of sound pressure and sound power levels .................................................. 13

9 Information to be recorded ............................................................................................. 13

10 Information to be reported ............................................................................................. 13

Annexes ............................................................................................................................... 14

Annex B (normative) Test enclosure ................................................................................... 14

Bibliography .......................................................................................................................... 15

Figure 101 – Isometric position views of the shaver, hair clipper or trimmer .......................... 12

Table 101 – Standard deviations of sound power levels .......................................................... 7

Table 102 – Standard deviations for declaration and verification ............................................. 7

---------------------- Page: 4 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-8: Particular requirements for electric shavers,
hair clippers or trimmers
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

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6) All users should ensure that they have the latest edition of this publication.

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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60704-2-8 has been prepared by subcommittee 59L: Small

household appliances, of IEC technical committee 59: Performance of household and similar

electrical appliances.

This second edition cancels and replaces the first edition published in 1997. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) the scope of the products has been enlarged to include hair clippers and trimmers;

b) it includes standard deviations of sound power levels in 1.1.3;

c) the normative references have been updated (ISO 3744:2010 and ISO 3743-1:2010);

---------------------- Page: 5 ----------------------
– 4 – IEC 60704-2-8:2020 © IEC 2020
d) it is adjusted with respect to IEC 60704-1:2010;
e) it has been updated to comply with the ISO/IEC Directives, Part 2.
The text of this standard is based on the following documents:
FDIS Report on voting
59L/176/FDIS 59L/177/RVD

Full information on the voting for the approval of this 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.

This Part 2-8 is intended to be used in conjunction with third edition (2010) of IEC 60704-1,

Household and similar electrical appliances – Test code for the determination of airborne

acoustical noise – Part 1: General requirements.

The relevant text of IEC 60704-1:2010 as amended by this standard establishes the test code

for shavers, hair clippers or trimmers.

This Part 2-8 supplements or modifies the corresponding clauses in IEC 60704-1:2010, so as

to establish the test code for shavers, hair clippers or trimmers. When a particular subclause

of IEC 60704-1:2010 is not mentioned in this Part 2-8, that subclause is applicable as far as

reasonable. Where this standard states "addition", "modification" or "replacement", the

relevant requirements, test specifications or explanatory matter in IEC 60704-1:2010 should

be adapted accordingly.

Subclauses, tables and figures that are numbered starting from 101 are additional to those in

IEC 60704-1:2010.

Unless notes are in a new subclause or involve notes in IEC 60704-1:2010, they are

numbered starting from 101, including those in a replaced clause or subclause.
Additional annexes are lettered AA, BB, etc.

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.

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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
---------------------- Page: 6 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 5 –
INTRODUCTION

The measuring conditions specified in this document provide for sufficient steadiness in the

noise emitted and reproducibility in different laboratories, whilst simulating as far as possible

the practical use of shavers, hair clippers or trimmers.

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 shavers, hair

clippers or trimmers.

NOTE As stated in the Introduction to IEC 60704-1:2010, this test code is concerned with airborne noise only.

---------------------- Page: 7 ----------------------
– 6 – IEC 60704-2-8:2020 © IEC 2020
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF
AIRBORNE ACOUSTICAL NOISE –
Part 2-8: Particular requirements for electric shavers,
hair clippers or trimmers
1 Scope and object
This clause of IEC 60704-1:2010 is applicable except as follows:
1.1 Scope
1.1.1 General
Replacement:

This document applies to electric shavers, hair clippers or trimmers for domestic and similar

use, supplied from mains or secondary batteries or primary batteries.

The term "similar use" is understood to mean the use in hotels, hospitals, shops, offices, etc.

NOTE 101 This document does not apply to shavers, hair clippers or trimmers that are powered by means other

than electrical, for example by a spring-device.

NOTE 102 If possible, this document can also be applied to analogous electrically operated devices, such as

depilating devices.
1.1.2 Types of noise
Replacement:

The methods specified in ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring

noise emitted by shavers, hair clippers or trimmers
1.1.3 Size of the source
Replacement:

The method specified in ISO 3744:2010 is applicable to noise sources of any size. Limitations

for the size of the source are given in Subclause 1.2 of ISO 3743-1:2010 and Clause 5 of

ISO 3743-2:2018.
1.2 Object
Addition:

Requirements for the declaration of noise emission values are not within the scope of this

document.

NOTE 101 For determining and verifying noise emission values declared in product specifications, see

IEC 60704-3.
1.3 Measurement uncertainty
Replacement:
---------------------- Page: 8 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 7 –

The estimated values of standard deviations of sound power levels determined in accordance

with this document are given in Table 101.
Table 101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
0,4 0,8
Addition:
1.101 Standard deviation for declaration and verification

For the purpose of determining and verifying declared noise emission values in accordance

with IEC 60704-3, the values in Table 102 apply.
Table 102 – Standard deviations for declaration and verification
Standard deviation (dB)
σ (production) σ (total) σ (reference)
P t M
0,7 to 1,3 1,1 to 1,5 1,5
2 Normative references
This clause of IEC 60704-1:2010 is applicable except as follows:
Replacement:

ISO 3743-1:2010, Acoustics – Determination of sound power levels and sound energy levels

of noise sources using sound pressure – Engineering methods for small movable sources in

reverberant fields – Part 1: Comparison method for a hard-walled test room

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 and sound energy levels of

noise sources using sound pressure – Engineering methods for an essentially free field over a

reflecting plane
3 Terms and definitions
This clause of IEC 60704-1:2010 is applicable except as follows:
Addition:

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
---------------------- Page: 9 ----------------------
– 8 – IEC 60704-2-8:2020 © IEC 2020
3.101
mains powered

shaver, hair clipper or trimmer that can be operated directly from the mains supply

3.102
rechargeable

shaver, hair clipper or trimmer that is supplied by a secondary battery belonging to it

3.103
battery powered
shaver, hair clipper or trimmer that is supplied by primary batteries
3.104
trimmer accessory

accessory incorporated in the shaver to groom particular facial hair, for example, moustache,

beard or side whiskers
4 Measurement methods and acoustical environments
This clause of IEC 60704-1:2010 is applicable except as follows:
4.2 Direct method
Addition:

Shavers, hair clippers or trimmers can produce pure tones. If pure tone components are

present in the noise emitted by the source, the estimated standard deviation of the measured

sound pressure levels in the special reverberation room can increase. In such cases,

additional microphone positions or source positions can be necessary, as specified in

ISO 3743-2.
4.3 Comparison method
Addition:

If pure tone components are present in the noise emitted by the source, the estimated

standard deviation of the measured sound pressure levels in the hard-walled test room or in

the special reverberation room can increase. In such cases, additional microphone positions

or source positions can be necessary, as specified in ISO 3743-1 or ISO 3743-2.
5 Instrumentation
This clause of IEC 60704-1:2010 is applicable.
6 Operation and location of appliances under test
This clause of IEC 60704-1:2010 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliances
6.1.1
Replacement:
---------------------- Page: 10 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 9 –

Shavers, hair clippers or trimmers shall be equipped as for ordinary shaving, clipping or

trimming. Shavers, hair clippers or trimmers with a cutting selector shall be adjusted in such a

way that the cutting head is in the least visible position that the construction allows.

The shaver, hair clipper or trimmer shall be clean, including the hair chamber, if any. The

appliance shall be oiled with a light oil having a viscosity not exceeding 20 cSt at 50 °C. If the

manufacturer prescribes a different method of cleaning or lubrication, the manufacturer's

method should be followed.

NOTE 101 During handling, take care to avoid any damage, especially to the cutting parts of the appliance as

these parts tend to be very delicate.
6.1.3
Replacement:

Prior to noise measurements, the appliance shall have been in operation for at least 10 min,

unless otherwise specified by the manufacturer.
6.1.4
Replacement:

Immediately before each series of noise measurements, the appliance is operated for 35 s ±

5 s to stabilize, without load, at the highest speed.
6.2 Supply of electric energy and of water or gas
6.2.2
Replacement:

Battery-operated shavers, hair clippers or trimmers are started, for noise measurements, with

fully loaded batteries as specified by the manufacturer. The batteries have to be replaced

when the voltage under load has dropped below 0,9 times the battery voltage under load with

fully loaded batteries.

Rechargeable shavers, hair clippers or trimmers are measured with fully charged batteries,

and disconnected from any external power source.
6.4 Loading and operating of appliances during tests
6.4.1
Replacement:

The shaver, hair clipper or trimmer is to be measured under no-load condition. If speed

control is provided, the highest speed setting has to be chosen.

When shavers, hair clippers or trimmers are equipped with more than one cutting head and if

a cutting selector for cutting heads is available, the selector setting that gives the highest

noise value shall be used.

Shavers can be equipped with a trimmer accessory. When the trimmer accessory can be

switched on and off, the following measurements shall be made:
– only shaving heads,
and the following measurements could be made:
---------------------- Page: 11 ----------------------
– 10 – IEC 60704-2-8:2020 © IEC 2020
– shaving heads + trimmer accessory (if possible);
– only trimmer accessory (if possible).

If there is more than one position for the trimmer accessory, the trimmer accessory position

that gives the highest noise value shall be measured.
6.4.3
Addition:

For shavers that operate with an operational cycle, the loudest part of the cycle should be

measured. This is preferably done by forcing the machine to operate in this loud part of the

cycle. If this is not possible, the actual measurement should be done during that particular

loud part of the cycle.
6.5 Location and mounting of appliances
6.5.1
Not applicable.
6.5.2
Addition:

Shavers, hair clippers or trimmers are positioned in such a way that the tangent plane of the

surface, which is normally in contact with the skin, is located vertically. The longitudinal axis

of the shaver, hair clipper or trimmer is located horizontally, if possible. The height, z , of 25

cm is measured from the centre of the cutting area towards the bottom surface.
Figure 101 show the different isometric postion views.
---------------------- Page: 12 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 11 –
a) Isometric position view, -z direction.
b) Isometric position view, -x direction
c) Isometric position view, +z direction
---------------------- Page: 13 ----------------------
– 12 – IEC 60704-2-8:2020 © IEC 2020
d) Isometic position view, +x direction
Figure 101 – Isometric position views of the shaver, hair clipper or trimmer
6.5.3
Not applicable.
6.5.4
Not applicable.
6.5.5
Not applicable.
7 Measurement of sound pressure levels
This clause of IEC 60704-1:2010 is applicable except as follows:
7.1 Microphone array, measurement surface and RSS location for essentially free-
field conditions over reflecting plane(s)
7.1.1
Not applicable.
7.1.2
Not applicable.
7.1.3
Not applicable.
7.1.5
Not applicable.
7.1.6
Not applicable.
7.4.1
Addition:
---------------------- Page: 14 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 13 –
The A-weighted sound pressure level shall be time-averaged during at least 30 s.
8 Calculation of sound pressure and sound power levels
This clause of IEC 60704-1:2010 is applicable.
9 Information to be recorded
This clause of IEC 60704-1:2010 is applicable except as follows:
9.7 Electric supply, water supply, etc.
9.7.3
Not applicable.
9.7.4
Not applicable.
9.8 Climatic conditions
9.8.3
Not applicable.
10 Information to be reported
This clause of IEC 60704-1:2010 is applicable except as follows:
10.3 Test conditions for the appliance
10.3.4
Not applicable.
10.3.5
Not applicable.
10.3.8
Not applicable.
---------------------- Page: 15 ----------------------
– 14 – IEC 60704-2-8:2020 © IEC 2020
Annexes
The annexes of IEC 60704-1:2010 apply with the following exception:
Annex B
(normative)
Test enclosure
This annex of IEC 60704-1:2010 is not applicable.
---------------------- Page: 16 ----------------------
IEC 60704-2-8:2020 © IEC 2020 – 15 –
Bibliography
Addition:
IEC 61254:1993, Electric shavers for household use – Methods for measuring the
performance

IEC 62863:2017, Method of measuring performances of electric hair clippers or trimmers for

household use
___________
---------------------- Page: 17 ----------------------
– 16 – IEC 60704-2-8:2020 © IEC 2020
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 17

INTRODUCTION ................................................................................................................... 20

1 Domaine d'application et objet ....................................................................................... 21

2 Références normatives .................................................................................................. 22

3 Termes et définitions ..................................................................................................... 22

4 Méthodes de mesure et environnements acoustiques .................................................... 23

5 Appareillage .................................................................................................................. 23

6 Fonctionnement et emplacement des appareils en essai ............................................... 24

7 Mesure des niveaux de pression acoustique .................................................................. 27

8 Calcul des niveaux de pression acoustique et de puissance acoustique ........................ 28

9 Informations à enregistrer .............................................................................................. 28

10 Informations à fournir .................................................................................................... 28

Annexes ............................................................................................................................... 29

Annexe B (normative) Meuble d’essai ................................................................................. 29

Bibliographie ......................................................................................................................... 30

Figure 101 – Vues en perspective isométrique du rasoir et de la tondeuse à barbe ou

à cheveux ............................................................................................................................. 27

Tableau 101 – Écarts-types des niveaux de puissance acoustique........................................ 22

Tableau 102 – Écarts-types pour la déclaration et la vérification ........................................... 22

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