IEC 60335-2-52:2021

Household and similar electrical appliances - Safety - Part 2-52: Particular requirements for oral hygiene appliances

IEC 60335-2-52:2021 deals with the safety of electric oral hygiene appliances for household and similar purposes, their rated voltage being not more than 250 V, including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that this standard is applicable to are
- oral irrigators;
- toothbrushes.
As far as is practicable, this standard deals with the common hazards presented by appliances that are encountered by all persons in and around the home. However, in general, it does not take into account
- persons (including children) whose physical, sensory or mental capabilities, or lack of experience and knowledge prevents them from using the appliance safely without supervision or instruction;
- children playing with the appliance.
Attention is drawn to the fact that
- for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements can be necessary;
- in many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour and similar authorities.
This standard does not apply to appliances for medical purposes (IEC 60601).
This fourth edition cancels and replaces the third edition published in 2002, Amendment 1: 2008 and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1, 11.7, 22.101);
c) clarification of requirements for battery-operated appliances (Clause 1, 11.7, B.11.1);
d) application of test probe 19 has been introduced (8.1.1, 20.2);
e) the stability test has been updated to cover hand-held parts of battery-operated appliances when placed on their charging stand (20.1);
f) a drop test is introduced for hand-held parts of an appliance (21.101);
g) additional strength tests for detachable power supply parts are introduced (21.102);
h) Table B.2 and Table B.3 updated to reflect smaller cell capacities for battery-operated appliances covered by this Part 2 standard.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its amendments unless that edition precludes it; in that case, the latest edition that does not preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.

Appareils électrodomestiques et analogues - Sécurité - Partie 2-52: Exigences particulières pour les appareils d'hygiène buccale

L'IEC 60335-2-52:2021 traite de la sécurité des appareils d'hygiène buccale électriques destinées à un usage domestique et analogue, dont la tension assignée est inférieure ou égale à 250 V, y compris les appareils alimentés en courant continu et les appareils alimentés par batteries.
La présente norme est applicable aux exemples d'appareils suivants, tels que:
- les jets dentaires;
- les brosses à dents.
Dans la mesure du possible, la présente norme traite des dangers courants que présentent les appareils et auxquels sont exposés tous les individus situés à l'intérieur et autour de l'habitation. Cependant, cette norme ne tient pas compte en général:
- des personnes (y compris des enfants) dont les capacités physiques, sensorielles ou mentales; ou le manque d'expérience et de connaissance les empêchent d'utiliser l'appareil en toute sécurité sans surveillance ou instruction;
- de l'utilisation de l'appareil comme jouet par des enfants.
L'attention est attirée sur le fait que:
- pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d'avions, des exigences supplémentaires peuvent être nécessaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées par les organismes nationaux de la santé, par les organismes nationaux responsables de la protection des travailleurs et par des organismes similaires.
La présente norme ne s'applique pas aux appareils à usage médical (IEC-60601).
Cette quatrième édition annule et remplace la troisième édition parue en 2002 et l'Amendement 1:2008 et l'Amendement 2:2017. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) alignement du texte sur l'IEC 60335-1:2020;
b) conversion en texte normatif de certaines notes (Article 1, 11.7, 22.101);
c) clarification des exigences pour les appareils alimentés par batteries (Article 1, 11.7, B.11.1);
d) introduction de l'application du calibre d'essai 19 (8.1.1, 20.2);
e) mise à jour de l'essai de stabilité pour couvrir les parties tenues à la main des appareils alimentés par batteries lorsqu'ils sont placés sur leur socle de charge (20.1);
f) introduction d'un essai de chute pour les parties tenues à la main des appareils (21.101);
g) introduction d'essais de résistance supplémentaires pour les parties d'alimentation amovibles (21.102);
h) mise à jour du Tableau B.2 et du Tableau B.3 pour refléter les capacités des éléments de plus petite taille pour les appareils alimentés par batteries couverts par la présente Partie 2.
La présente Partie 2 doit être utilisée conjointement avec la dernière édition de l'IEC 60335-1 et ses amendements, sauf si cette édition l'exclut. Dans ce cas, la dernière édition qui n'exclut pas la présente Partie 2 est utilisée. Elle a été établie sur la base de la sixième édition (2020) de cette norme.

General Information

• Status: Published
• Publication Date: 10-Nov-2021
• ICS: 13.120 - Domestic safety
• ICS: 97.170 - Body care equipment
• Technical Committee: TC 61 - Safety of household and similar electrical appliances
• Drafting Committee: MT 37 - TC 61/MT 37
• Current Stage: PPUB - Publication issued
• Start Date: 11-Nov-2021
• Completion Date: 03-Dec-2021

Relations

• Revises: IEC 60335-2-52:2002 - Household and similar electrical appliances - Safety - Part 2-52: Particular requirements for oral hygiene appliances
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-52:2002/AMD2:2017 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-52: Particular requirements for oral hygiene appliances
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-52:2002/AMD1:2008 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-52: Particular requirements for oral hygiene appliances
• Effective Date: 05-Sep-2023

Overview

IEC 60335-2-52:2021 is the fourth edition of the IEC Part 2 safety standard for electric oral hygiene appliances used in households and similar environments. It covers appliances with a rated voltage up to 250 V (including DC‑supplied and battery‑operated devices) - for example electric toothbrushes and oral irrigators. This edition is a technical revision aligned with IEC 60335-1:2020 and replaces the previous (2002) edition and its amendments.

Key topics and technical requirements

This Part 2 standard supplements IEC 60335-1 and focuses on hazards and tests specific to oral hygiene appliances. Important technical topics include:

• Scope and exclusions: applies to household oral hygiene appliances; it does not apply to medical devices (see IEC 60601) and generally does not address users who require supervision or children playing with appliances.
• Battery-operated appliances: clarified requirements for battery and cell capacities; normative Annex B addresses separable and detachable batteries for battery-operated appliances.
• Construction and safety tests: introduces and updates specific tests and requirements such as:
  • Alignment with IEC 60335-1:2020 wording and normative changes.
  • Use of test probe 19 for protection against access to live parts and surface measurements.
  • Updated stability tests covering hand‑held parts when placed on charging stands.
  • New drop test for hand‑held parts (mechanical robustness).
  • Additional strength tests for detachable power‑supply components.
• Thermal, electrical and mechanical safety: limits on surface temperature rises, leakage currents, electric strength, moisture resistance, mechanical strength and endurance, and resistance to fire and corrosion are covered by Part 1 plus Part 2 specific clauses.
• Labeling, instructions and classification: marking and instructions requirements tailored to oral hygiene appliance use.

Practical applications and who uses it

IEC 60335-2-52:2021 is essential for stakeholders involved in the design, manufacture, testing and certification of household oral hygiene products:

• Product designers & R&D teams - to design safe electric toothbrushes and oral irrigators that meet global safety expectations.
• Compliance and regulatory teams - to verify conformity with electrical and mechanical safety requirements for consumer markets.
• Test laboratories & certification bodies - to perform required tests (stability, drop, battery tests, probe testing) and issue conformity/approval reports.
• Manufacturers & suppliers - to prepare technical files, user instructions and ensure safe detachable power supplies and battery systems.

Related standards (use in conjunction)

• IEC 60335-1 – General requirements for household and similar electrical appliances (mandatory companion).
• IEC 60601 – Excluded: applies to medical electrical equipment.
• National health and labour regulations – may impose additional requirements for oral care appliances or specific use environments (vehicles, ships, aircraft).

Keywords: IEC 60335-2-52:2021, oral hygiene appliances safety, electric toothbrush standard, oral irrigator safety, battery-operated appliance requirements, IEC 60335-1 alignment.

Standards Content (Sample)

IEC 60335-2-52 ®
Edition 4.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
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Household and similar electrical appliances – Safety –
Part 2-52: Particular requirements for oral hygiene appliances

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IEC 60335-2-52 ®
Edition 4.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-52: Particular requirements for oral hygiene appliances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.120; 97.170 ISBN 978-2-8322-4095-3

– 2 – IEC 60335-2-52:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 General requirement . 9
5 General conditions for the tests . 9
6 Classification . 9
7 Marking and instructions . 9
8 Protection against access to live parts . 10
9 Starting of motor-operated appliances . 10
10 Power input and current . 10
11 Heating . 10
12 Void Charging of metal-ion batteries . 11
13 Leakage current and electric strength at operating temperature . 11
14 Transient overvoltages . 11
15 Moisture resistance . 11
16 Leakage current and electric strength . 11
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 12
20 Stability and mechanical hazards . 12
21 Mechanical strength . 13
22 Construction . 14
23 Internal wiring . 14
24 Components . 14
25 Supply connection and external flexible cords . 14
26 Terminals for external conductors . 15
27 Provision for earthing . 15
28 Screws and connections . 15
29 Clearances, creepage distances and solid insulation . 15
30 Resistance to heat and fire . 15
31 Resistance to rusting . 15
32 Radiation, toxicity and similar hazards . 15
Annexes . 17
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 18
Bibliography . 20

Figure 101 – Probe for measuring surface temperatures . 16

Table 101 – Maximum temperature rises of external accessible surfaces under normal
operating conditions . 11
Table B.2 – Total area of openings for metal-ion cells . 18
Table B.3 – Volume of air injected at 2 070 kPa . 18

– 4 – IEC 60335-2-52:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-52: Particular requirements for oral hygiene appliances

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60335-2-52:2002+AMD1:2008+AMD2:2017 CSV. A vertical bar appears
in the margin wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
IEC 60335-2-52 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2002, Amendment 1: 2008
and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1, 11.7, 22.101);
c) clarification of requirements for battery-operated appliances (Clause 1, 11.7, B.11.1);
d) application of test probe 19 has been introduced (8.1.1, 20.2);
e) the stability test has been updated to cover hand-held parts of battery-operated appliances
when placed on their charging stand (20.1);
f) a drop test is introduced for hand-held parts of an appliance (21.101);
g) additional strength tests for detachable power supply parts are introduced (21.102);
h) Table B.2 and Table B.3 updated to reflect smaller cell capacities for battery-operated
appliances covered by this Part 2 standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6368/FDIS 61/6418/RVD
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/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When ”Part 1” is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for oral hygiene appliances.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states “addition”, “modification” or “replacement”, the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;

– 6 – IEC 60335-2-52:2021 RLV © IEC 2021
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
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,
• replaced by a revised edition, or
• amended.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class 0 appliances are allowed (Japan).
– 6.1: Appliances may have other classifications (USA).
– 7.12.1: Additional instructions are required (USA).
– 11.7: The duration and number of cycles are different (USA).
– 19.101: The test is different (USA).
– 22.36: Hand-held parts may be class 0 construction (Japan).

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.

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal and generic standards publications, basic safety publications and group safety publications
covering a hazard are not applicable since they have been taken into consideration when developing the general and
particular requirements for the IEC 60335 series of standards. For example, in the case of temperature requirements
for surfaces on many appliances, generic standards, such as ISO 13732-1 for hot surfaces, are not applicable in
addition to Part 1 or part 2 standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-52:2021 RLV © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-52: Particular requirements for oral hygiene appliances

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric oral hygiene appliances for household
and similar purposes, their rated voltage being not more than 250 V, including direct current
(DC) supplied appliances and battery-operated appliances.
NOTE 101 Examples of appliances covered by that this standard is applicable to are
– oral irrigators;
– toothbrushes.
As far as is practicable, this standard deals with the common hazards presented by appliances
that are encountered by all persons in and around the home. However, in general, it does not
take into account
– persons (including children) whose
• physical, sensory or mental capabilities; or
• lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
NOTE 102 Attention is drawn to the fact that
– for appliances intended to be used in vehicles or on board ships or aircraft, additional
requirements may can be necessary;
– in many countries additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour and similar authorities.
NOTE 103 This standard does not apply to appliances for medical purposes (IEC 60601).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics

3.1.9 Replacement Addition:
normal operation
operation of the appliance under the following conditions:
Oral irrigators are operated with the reservoir filled with water having a temperature of
approximately 45 °C, to the level specified in the instructions. In the absence of such
instructions, the reservoir is filled to the maximum level.
Other appliances are operated without load.
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Appliances shall be class II or class III.
6.2 Addition:
Class II appliances shall be at least IPX7 except that parts intended to be fixed, and
transformers with pins for insertion into socket-outlets, shall be at least IPX4.
Class III appliances shall be at least IPX4. However, if the rated voltage does not exceed 24
V, they may be IPX0.
Appliances shall be at least IPX7.
This classification does not apply to:
– parts that are intended to be fixed and detachable power supply parts with pins for
insertion into socket outlets that are at least IPX4; or
– class III appliances or parts of class III construction, including hand-held parts, that are
at least IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.12.1 Addition:
The installation instructions shall state that parts that have to be fixed must be fixed so that
they cannot fall into water, unless they are of IPX7 construction.

– 10 – IEC 60335-2-52:2021 RLV © IEC 2021
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.7 Replacement Modification:
Appliances are operated for five cycles, each cycle comprising an operating period of 3 min and
a rest period of 1 min. During the rest period, the reservoir of oral irrigators is refilled.
NOTE 101 If the reservoir empties during the operating period, it is refilled and the test is
continued.
For appliances incorporating integral batteries or separable batteries not disconnected from
the appliance for charging purposes:
– the battery that has been fully discharged is charged for 1 h, while the appliance is
operated as specified, if allowed by the construction of the appliance;
– the battery that has been fully discharged is charged, for a duration of 24 h or until it is
fully charged whichever is shorter, without the battery-operated appliance performing its
intended function.
11.8 Addition Modification:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.

Addition:
Table 101 – Maximum temperature rises of external accessible surfaces
under normal operating conditions
Surface Temperature rise of external accessible surfaces
K
Bare metal 38
a
Coated metal
Glass and ceramic 51
b, c
Plastic and plastic coating > 0,4 mm
NOTE The temperature rise limits of knobs, grips, keyboards, keypads and similar parts are specified in Table 3.
a
Metal is considered coated when a coating having a minimum thickness of 90 µm made by of enamel or non-

substantially plastic coating is used.
b
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
c
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of the coated
metal or of glass and ceramic material apply.

12 Void Charging of metal-ion batteries
This clause of Part 1 is applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.

– 12 – IEC 60335-2-52:2021 RLV © IEC 2021
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.1 Addition:
Class II oral irrigators are also subjected to the test of 19.101.
19.2 Addition:
The test is carried out without water in the reservoir.
19.101 The hose is punctured within the enclosure of the appliance at the most unfavourable
location. Rubber hoses are punctured by means of a 0,8 mm diameter needle. Thermoplastic
hoses are punctured by means of a 0,5 mm diameter heated needle, care being taken not to
enlarge the hole.
NOTE When reassembling the appliance, sealants such as silicone rubber may can be used to insure ensure that
the joints are watertight.
The appliance is operated as specified in Clause 11, but with water containing 1 % NaCl. During
the last cycle of operation, the water pressure in the hose is increased to the maximum
obtainable by blocking the water outlet. The pressure is then reduced to its normal value.
A vessel of insulating material is filled with the saline solution and the hand-held part of the
appliance is immersed to a depth of approximately 100 mm. The appliance is operated without
restricting the water flow until 30 s after the reservoir has emptied. During the test, the leakage
current is measured, as specified in 13.2. It is measured between any pole of the supply and a
rectangular stainless steel electrode, having dimensions approximately 250 mm × 50 mm,
placed in the solution.
The leakage current shall not exceed 0,5 mA.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.1 Replacement:
Appliances, other than fixed appliances and hand-held appliances, intended to be used on a
surface such as the floor or a table, shall have adequate stability. Hand-held parts of appliances
with a charging stand shall have adequate stability when the hand-held part is placed on its
charging stand. However, adequate stability is not necessary if overturning of the appliance
does not present a risk of fire, electric shock or injury.
Compliance is checked by the following test, appliances incorporating an appliance inlet being
fitted with an appropriate connector and flexible cord. Hand-held parts of appliances with a
charging stand are subjected to the test with the hand-held part placed on its charging stand.
The appliance, not connected to the supply mains, is placed in any normal position of use on a
plane inclined at an angle of 10° to the horizontal, the supply cord resting on the inclined plane
in the most unfavourable position. However, if part of an appliance comes into contact with the
horizontal supporting surface when the appliance is tilted through an angle of 10°, the appliance
is placed on a horizontal support and tilted in the most unfavourable direction through an angle
of 10°.
The test on the horizontal support may be necessary for appliances provided with rollers,
castors or feet. In this case, castors or wheels can be blocked to prevent the appliance from
rolling.
Appliances intended to be filled with liquid by the user in normal use are tested empty or filled
with the most unfavourable quantity of water up to the capacity indicated in the instructions.
The appliance shall not overturn unless the appliance or the part of the appliance that overturns
complies with all of the following:
– it only contains circuits operating at SELV in accordance with 8.1.4;
– it only contains low power circuits in accordance with 19.11.1;
– it is dropped from a height of 700 mm on a rigidly supported hard wood board five times,
the appliance being held in different positions likely to occur. After the drops, the appliance
or part of the appliance, as relevant, shall show no damage so that compliance with 15.1
and 20.2 is not impaired;
– it has a maximum weight of 450 g when ready for use;
– it does not have sharp edges when ready for use. An edge with a radius of 1 mm or more is
not considered a sharp edge.
The test is repeated on appliances with heating elements with the angle of inclination increased
to 15°. If the appliance overturns in one or more positions, it is subjected to the tests of
Clause 11 in each of these overturned positions.
During this test, temperature rises shall not exceed the values shown in Table 9.
20.2 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
Modification:
Test probe 18 and test probe 19 are not applied to appliances for commercial use.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Addition:
Hand-held parts of appliances are also subjected to the test of 21.101.
21.101 The hand-held part of the appliance is placed in a sling that is constructed by tying
together the four corners of a single layer of cheesecloth. The lowest point of the sling is
suspended at a height of 900 mm above a concrete, or similarly hard, surface.
The hand-held part of the appliance in the sling is dropped from a stationary position. The test
is carried out a total of five times with the hand-held part of the appliance being positioned so
that it falls onto the concrete surface in five different orientations.
The hand-held part of the appliance shall not be damaged to such an extent that compliance
with 8.1 and Clause 29 is impaired.

– 14 – IEC 60335-2-52:2021 RLV © IEC 2021
21.102 For appliances with a detachable power supply part, the enclosure of the detachable
power supply part shall have adequate mechanical strength against dropping.
The requirement is not applicable to a detachable power supply part with pins for insertion
into a socket outlet.
Compliance is checked by the following test.
The detachable power supply part is placed in a sling that is constructed by tying together
the four corners of a single layer of cheesecloth. The lowest point of the sling is suspended at
a height of 900 mm above a concrete, or similarly hard, surface.
The detachable power supply part in the sling is dropped from a stationary position. The test
is carried out a total of five times with the detachable power supply part being positioned so
that it falls onto the concrete surface in five different orientations.
The detachable power supply part shall not be damaged to such an extent that compliance
with 8.1 and Clause 29 is impaired.
22 Construction
This clause of Part 1 is applicable except as follows.
22.36 Addition:
Hand-held parts shall be class III construction having a working voltage not exceeding 24 V.
22.101 Class II appliances shall be constructed so that parts intended to be fixed can be
fixed securely, unless they are classified at least IPX7.
NOTE Keyhole slots, hooks and similar means, without further means to prevent the appliance being inadvertently
lifted off the support, are not considered to be adequate means for fixing the appliance securely.
The Class II appliances shall not be fixed by keyhole slots, hooks and similar means, without
further means to prevent the appliance being inadvertently lifted off the support.
Compliance is checked by inspection.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable except as follows.
25.5 Addition:
Type X attachment is not allowed for appliances classified IPX7.

Type Z attachment is allowed.
25.23 Addition:
Interconnection cords for parts of class III construction are not required to comply with the
requirements for supply cords.
26 Terminals for external conductors
This clause of Part 1 is applicable.
27 Provision for earthing
This clause of Part 1 is not applicable.
28 Screws and connections
This clause of Part 1 is applicable.
29 Clearances, creepage distances and solid insulation
This clause of Part 1 is applicable.
30 Resistance to heat and fire
This clause of Part 1 is applicable except as follows.
30.2 Modification:
Replace the two dashed items in the compliance statement with the following:
For oral hygiene appliances, 30.2.2 is applicable.
30.2.3 Not applicable.
31 Resistance to rusting
This clause of Part 1 is applicable.
32 Radiation, toxicity and similar hazards
This clause of Part 1 is applicable.

– 16 – IEC 60335-2-52:2021 RLV © IEC 2021

Key
A adhesive
B thermocouple wires 0,3 mm diameter according to IEC 60584-1 Type K (chrome alumel)
C handle arrangement permitting a contact force of 4 N ± 1 N
D polycarbonate tube: inside diameter 3 mm, outside diameter 5 mm
E tinned copper disc: 5 mm diameter, 0,5 mm thick with flat contact face
Figure 101 – Probe for measuring surface temperatures

Annexes
The annexes of Part 1 are applicable except as follows.

– 18 – IEC 60335-2-52:2021 RLV © IEC 2021
Annex B
(normative)
Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances
Annex B of Part 1 is applicable except as follows.
11 Heating
B.11.1 Modification:
Battery-operated appliances are tested under the conditions of normal operation with the
appliance operated for five cycles, where each cycle comprises an operating period of 3 min
and a rest period of 1 min. During the rest period, the reservoir of oral irrigators is refilled. If
the reservoir empties during the operating period, it is refilled and the test is continued.
For appliances incorporating integral batteries or separable batteries not disconnected from
the appliance for charging purposes, and that cannot perform their intended function while the
batteries are being charged, the appliance is operated as specified until it cannot perform its
intended function due to the depletion of the batteries.
20 Stability and mechanical hazards
B.20.1 Modification:
Table B.2 – Total area of openings for metal-ion cells
Capacity of the single metal-ion cell with the Min. total area of openings
highest capacity
Ah
mm
0,2 ≤ Ah < 1 6
1 ≤ Ah < 3 10
3 ≤ Ah < 5 20
5 ≤ Ah < 25 30
25 ≤ Ah < 100 50
Ah ≥ 100 100
Table B.3 – Volume of air injected at 2 070 kPa
Capacity of the single metal-ion cell with the Volume of air (±10 %)
highest capacity
Ah ml
0,2 ≤ Ah < 1 6
1 ≤ Ah < 3 10
3 ≤ Ah < 5 20
5 ≤ Ah < 25 30
25 ≤ Ah < 100 50
Ah ≥ 100 100
22 Construction
B.22.3 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
B.22.4 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.

– 20 – IEC 60335-2-52:2021 RLV © IEC 2021
Bibliography
The bibliography of Part 1 is applicable.

___________
IEC 60335-2-52 ®
Edition 4.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-52: Particular requirements for oral hygiene appliances

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-52: Exigences particulières pour les appareils d'hygiène buccale

– 2 – IEC 60335-2-52:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 9
5 General conditions for the tests . 9
6 Classification . 9
7 Marking and instructions . 9
8 Protection against access to live parts . 10
9 Starting of motor-operated appliances . 10
10 Power input and current . 10
11 Heating . 10
12 Charging of metal-ion batteries . 11
13 Leakage current and electric strength at operating temperature . 11
14 Transient overvoltages . 11
15 Moisture resistance . 11
16 Leakage current and electric strength . 11
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 12
20 Stability and mechanical hazards . 12
21 Mechanical strength . 13
22 Construction . 14
23 Internal wiring . 14
24 Components . 14
25 Supply connection and external flexible cords . 14
26 Terminals for external conductors . 15
27 Provision for earthing . 15
28 Screws and connections . 15
29 Clearances, creepage distances and solid insulation . 15
30 Resistance to heat and fire . 15
31 Resistance to rusting . 15
32 Radiation, toxicity and similar hazards .
...

IEC 60335-2-52 ®
Edition 4.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-52: Particular requirements for oral hygiene appliances

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-52: Exigences particulières pour les appareils d'hygiène buccale

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IEC 60335-2-52 ®
Edition 4.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-52: Particular requirements for oral hygiene appliances

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-52: Exigences particulières pour les appareils d'hygiène buccale

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120; 97.170 ISBN 978-2-8322-1045-8

– 2 – IEC 60335-2-52:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 9
5 General conditions for the tests . 9
6 Classification . 9
7 Marking and instructions . 9
8 Protection against access to live parts . 10
9 Starting of motor-operated appliances . 10
10 Power input and current . 10
11 Heating . 10
12 Charging of metal-ion batteries . 11
13 Leakage current and electric strength at operating temperature . 11
14 Transient overvoltages . 11
15 Moisture resistance . 11
16 Leakage current and electric strength . 11
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 12
20 Stability and mechanical hazards . 12
21 Mechanical strength . 13
22 Construction . 14
23 Internal wiring . 14
24 Components . 14
25 Supply connection and external flexible cords . 14
26 Terminals for external conductors . 15
27 Provision for earthing . 15
28 Screws and connections . 15
29 Clearances, creepage distances and solid insulation . 15
30 Resistance to heat and fire . 15
31 Resistance to rusting . 15
32 Radiation, toxicity and similar hazards . 15
Annexes . 17
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 18
Bibliography . 20

Figure 101 – Probe for measuring surface temperatures . 16

Table 101 – Maximum temperature rises of external accessible surfaces under normal
operating conditions . 11
Table B.2 – Total area of openings for metal-ion cells . 18
Table B.3 – Volume of air injected at 2 070 kPa . 18

– 4 – IEC 60335-2-52:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-52: Particular requirements for oral hygiene 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) 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.
IEC 60335-2-52 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2002, Amendment 1: 2008
and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1, 11.7, 22.101);
c) clarification of requirements for battery-operated appliances (Clause 1, 11.7, B.11.1);
d) application of test probe 19 has been introduced (8.1.1, 20.2);
e) the stability test has been updated to cover hand-held parts of battery-operated appliances
when placed on their charging stand (20.1);

f) a drop test is introduced for hand-held parts of an appliance (21.101);
g) additional strength tests for detachable power supply parts are introduced (21.102);
h) Table B.2 and Table B.3 updated to reflect smaller cell capacities for battery-operated
appliances covered by this Part 2 standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6368/FDIS 61/6418/RVD
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/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When ”Part 1” is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for oral hygiene appliances.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states “addition”, “modification” or “replacement”, the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
notes: in small roman type.
–
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.

– 6 – IEC 60335-2-52:2021 © IEC 2021
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,
• replaced by a revised edition, or
• amended.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class 0 appliances are allowed (Japan).
– 6.1: Appliances may have other classifications (USA).
– 7.12.1: Additional instructions are required (USA).
– 11.7: The duration and number of cycles are different (USA).
– 19.101: The test is different (USA).
– 22.36: Hand-held parts may be class 0 construction (Japan).

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-52:2021 © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-52: Particular requirements for oral hygiene appliances

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric oral hygiene appliances for household
and similar purposes, their rated voltage being not more than 250 V, including direct current
(DC) supplied appliances and battery-operated appliances.
Examples of appliances that this standard is applicable to are
– oral irrigators;
– toothbrushes.
As far as is practicable, this standard deals with the common hazards presented by appliances
that are encountered by all persons in and around the home. However, in general, it does not
take into account
– persons (including children) whose
• physical, sensory or mental capabilities; or
• lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
Attention is drawn to the fact that
– for appliances intended to be used in vehicles or on board ships or aircraft, additional
requirements can be necessary;
– in many countries additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour and similar authorities.
This standard does not apply to appliances for medical purposes (IEC 60601).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances

3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.9 Addition:
operation of the appliance under the following conditions:
Oral irrigators are operated with the reservoir filled with water having a temperature of
approximately 45 °C, to the level specified in the instructions. In the absence of such
instructions, the reservoir is filled to the maximum level.
Other appliances are operated without load.
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Appliances shall be class II or class III.
6.2 Addition:
Appliances shall be at least IPX7.
This classification does not apply to:
– parts that are intended to be fixed and detachable power supply parts with pins for
insertion into socket outlets that are at least IPX4; or
– class III appliances or parts of class III construction, including hand-held parts, that are
at least IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.12.1 Addition:
The installation instructions shall state that parts that have to be fixed must be fixed so that
they cannot fall into water, unless they are of IPX7 construction.

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8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.7 Modification:
Appliances are operated for five cycles, each cycle comprising an operating period of 3 min and
a rest period of 1 min. During the rest period, the reservoir of oral irrigators is refilled. If the
reservoir empties during the operating period, it is refilled and the test is continued.
For appliances incorporating integral batteries or separable batteries not disconnected from
the appliance for charging purposes:
– the battery that has been fully discharged is charged for 1 h, while the appliance is
operated as specified, if allowed by the construction of the appliance;
– the battery that has been fully discharged is charged, for a duration of 24 h or until it is
fully charged whichever is shorter, without the battery-operated appliance performing its
intended function.
11.8 Modification:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.

Addition:
Table 101 – Maximum temperature rises of external accessible surfaces
under normal operating conditions
Surface Temperature rise of external accessible surfaces
K
Bare metal 38
a
Coated metal
Glass and ceramic 51
b, c
Plastic and plastic coating > 0,4 mm
NOTE The temperature rise limits of knobs, grips, keyboards, keypads and similar parts are specified in Table 3.
a
Metal is considered coated when a coating having a minimum thickness of 90 µm made of enamel or non-

substantially plastic coating is used.
b
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
c
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of the coated
metal or of glass and ceramic material apply.

12 Charging of metal-ion batteries
This clause of Part 1 is applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.

– 12 – IEC 60335-2-52:2021 © IEC 2021
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.1 Addition:
Class II oral irrigators are also subjected to the test of 19.101.
19.2 Addition:
The test is carried out without water in the reservoir.
19.101 The hose is punctured within the enclosure of the appliance at the most unfavourable
location. Rubber hoses are punctured by means of a 0,8 mm diameter needle. Thermoplastic
hoses are punctured by means of a 0,5 mm diameter heated needle, care being taken not to
enlarge the hole.
NOTE When reassembling the appliance, sealants such as silicone rubber can be used to ensure that the joints are
watertight.
The appliance is operated as specified in Clause 11, but with water containing 1 % NaCl. During
the last cycle of operation, the water pressure in the hose is increased to the maximum
obtainable by blocking the water outlet. The pressure is then reduced to its normal value.
A vessel of insulating material is filled with the saline solution and the hand-held part of the
appliance is immersed to a depth of approximately 100 mm. The appliance is operated without
restricting the water flow until 30 s after the reservoir has emptied. During the test, the leakage
current is measured, as specified in 13.2. It is measured between any pole of the supply and a
rectangular stainless steel electrode, having dimensions approximately 250 mm × 50 mm,
placed in the solution.
The leakage current shall not exceed 0,5 mA.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.1 Replacement:
Appliances, other than fixed appliances and hand-held appliances, intended to be used on a
surface such as the floor or a table, shall have adequate stability. Hand-held parts of appliances
with a charging stand shall have adequate stability when the hand-held part is placed on its
charging stand. However, adequate stability is not necessary if overturning of the appliance
does not present a risk of fire, electric shock or injury.
Compliance is checked by the following test, appliances incorporating an appliance inlet being
fitted with an appropriate connector and flexible cord. Hand-held parts of appliances with a
charging stand are subjected to the test with the hand-held part placed on its charging stand.
The appliance, not connected to the supply mains, is placed in any normal position of use on a
plane inclined at an angle of 10° to the horizontal, the supply cord resting on the inclined plane
in the most unfavourable position. However, if part of an appliance comes into contact with the
horizontal supporting surface when the appliance is tilted through an angle of 10°, the appliance
is placed on a horizontal support and tilted in the most unfavourable direction through an angle
of 10°.
The test on the horizontal support may be necessary for appliances provided with rollers,
castors or feet. In this case, castors or wheels can be blocked to prevent the appliance from
rolling.
Appliances intended to be filled with liquid by the user in normal use are tested empty or filled
with the most unfavourable quantity of water up to the capacity indicated in the instructions.
The appliance shall not overturn unless the appliance or the part of the appliance that overturns
complies with all of the following:
– it only contains circuits operating at SELV in accordance with 8.1.4;
– it only contains low power circuits in accordance with 19.11.1;
– it is dropped from a height of 700 mm on a rigidly supported hard wood board five times,
the appliance being held in different positions likely to occur. After the drops, the appliance
or part of the appliance, as relevant, shall show no damage so that compliance with 15.1
and 20.2 is not impaired;
– it has a maximum weight of 450 g when ready for use;
– it does not have sharp edges when ready for use. An edge with a radius of 1 mm or more is
not considered a sharp edge.
The test is repeated on appliances with heating elements with the angle of inclination increased
to 15°. If the appliance overturns in one or more positions, it is subjected to the tests of
Clause 11 in each of these overturned positions.
During this test, temperature rises shall not exceed the values shown in Table 9.
20.2 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
Modification:
Test probe 18 and test probe 19 are not applied to appliances for commercial use.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Addition:
Hand-held parts of appliances are also subjected to the test of 21.101.
21.101 The hand-held part of the appliance is placed in a sling that is constructed by tying
together the four corners of a single layer of cheesecloth. The lowest point of the sling is
suspended at a height of 900 mm above a concrete, or similarly hard, surface.
The hand-held part of the appliance in the sling is dropped from a stationary position. The test
is carried out a total of five times with the hand-held part of the appliance being positioned so
that it falls onto the concrete surface in five different orientations.
The hand-held part of the appliance shall not be damaged to such an extent that compliance
with 8.1 and Clause 29 is impaired.

– 14 – IEC 60335-2-52:2021 © IEC 2021
21.102 For appliances with a detachable power supply part, the enclosure of the detachable
power supply part shall have adequate mechanical strength against dropping.
The requirement is not applicable to a detachable power supply part with pins for insertion
into a socket outlet.
Compliance is checked by the following test.
The detachable power supply part is placed in a sling that is constructed by tying together
the four corners of a single layer of cheesecloth. The lowest point of the sling is suspended at
a height of 900 mm above a concrete, or similarly hard, surface.
The detachable power supply part in the sling is dropped from a stationary position. The test
is carried out a total of five times with the detachable power supply part being positioned so
that it falls onto the concrete surface in five different orientations.
The detachable power supply part shall not be damaged to such an extent that compliance
with 8.1 and Clause 29 is impaired.
22 Construction
This clause of Part 1 is applicable except as follows.
22.36 Addition:
Hand-held parts shall be class III construction having a working voltage not exceeding 24 V.
22.101 Class II appliances shall be constructed so that parts intended to be fixed can be
fixed securely, unless they are classified at least IPX7.
The Class II appliances shall not be fixed by keyhole slots, hooks and similar means, without
further means to prevent the appliance being inadvertently lifted off the support.
Compliance is checked by inspection.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable except as follows.
25.5 Addition:
Type X attachment is not allowed for appliances classified IPX7.
Type Z attachment is allowed.
25.23 Addition:
Interconnection cords for parts of class III construction are not required to comply with the
requirements for supply cords.
26 Terminals for external conductors
This clause of Part 1 is applicable.
27 Provision for earthing
This clause of Part 1 is not applicable.
28 Screws and connections
This clause of Part 1 is applicable.
29 Clearances, creepage distances and solid insulation
This clause of Part 1 is applicable.
30 Resistance to heat and fire
This clause of Part 1 is applicable except as follows.
30.2 Modification:
Replace the two dashed items in the compliance statement with the following:
For oral hygiene appliances, 30.2.2 is applicable.
31 Resistance to rusting
This clause of Part 1 is applicable.
32 Radiation, toxicity and similar hazards
This clause of Part 1 is applicable.

– 16 – IEC 60335-2-52:2021 © IEC 2021

Key
A adhesive
B thermocouple wires 0,3 mm diameter according to IEC 60584-1 Type K
C handle arrangement permitting a contact force of 4 N ± 1 N
D polycarbonate tube: inside diameter 3 mm, outside diameter 5 mm
E tinned copper disc: 5 mm diameter, 0,5 mm thick with flat contact face
Figure 101 – Probe for measuring surface temperatures

Annexes
The annexes of Part 1 are applicable except as follows.

– 18 – IEC 60335-2-52:2021 © IEC 2021
Annex B
(normative)
Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances
Annex B of Part 1 is applicable except as follows.
11 Heating
B.11.1 Modification:
Battery-operated appliances are tested under the conditions of normal operation with the
appliance operated for five cycles, where each cycle comprises an operating period of 3 min
and a rest period of 1 min. During the rest period, the reservoir of oral irrigators is refilled. If
the reservoir empties during the operating period, it is refilled and the test is continued.
For appliances incorporating integral batteries or separable batteries not disconnected from
the appliance for charging purposes, and that cannot perform their intended function while the
batteries are being charged, the appliance is operated as specified until it cannot perform its
intended function due to the depletion of the batteries.
20 Stability and mechanical hazards
B.20.1 Modification:
Table B.2 – Total area of openings for metal-ion cells
Capacity of the single metal-ion cell with the Min. total area of openings
highest capacity
Ah
mm
0,2 ≤ Ah < 1 6
1 ≤ Ah < 3 10
3 ≤ Ah < 5 20
5 ≤ Ah < 25 30
25 ≤ Ah < 100 50
Ah ≥ 100 100
Table B.3 – Volume of air injected at 2 070 kPa
Capacity of the single metal-ion cell with the Volume of air (±10 %)
highest capacity
Ah ml
0,2 ≤ Ah < 1 6
1 ≤ Ah < 3 10
3 ≤ Ah < 5 20
5 ≤ Ah < 25 30
25 ≤ Ah < 100 50
Ah ≥ 100 100
22 Construction
B.22.3 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.
B.22.4 Addition:
For toothbrushes, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also
applied as specified for test probe 18.

– 20 – IEC 60335-2-52:2021 © IEC 2021
Bibliography
The bibliography of Part 1 is applicable.

___________
– 22 – IEC 60335-2-52:2021 © IEC 2021
SOMMAIRE
AVANT-PROPOS . 24
INTRODUCTION . 27
1 Domaine d'application . 28
2 Références normatives . 28
3 Termes et définitions . 29
4 Exigences générales . 29
5 Conditions générales d'essais . 29
6 Classification . 29
7 Marquage et instructions . 29
8 Protection contre l'accès aux parties actives. 30
9 Démarrage des appareils à moteur . 30
10 Puissance et courant . 30
11 Echauffements. 30
12 Charge des batteries à ions métalliques . 31
13 Courant de fuite et rigidité diélectrique à la température de régime . 31
14 Surtensions transitoires . 31
15 Résistance à l'humidité . 31
16 Courant de fuite et rigidité diélectrique . 31
17 Protection contre la surcharge des transformateurs et des circuits associés . 31
18 Endurance . 31
19 Fonctionnement anormal . 32
20 Stabilité et dangers mécaniques . 32
21 Résistance mécanique . 33
22 Construction . 34
23 Conducteurs internes. 34
24 Composants . 34
25 Raccordement au réseau et câbles souples extérieurs .
...