IEC 60335-2-26:2024

Household and similar electrical appliances - Safety - Part 2-26: Particular requirements for clocks

IEC 60335-2-26:2024 deals with the safety of electric clocks having a rated voltage not more than 250 V including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that are within the scope of this standard are
– alarm clocks;
– spring-driven clocks with an electrically operated winding mechanism;
– clocks incorporating driving means other than motors.
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.
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 intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– clocks having other functions, whether or not in combination with time indication, such as master control clocks and timers for cooking ranges, washing machines and similar appliances;
– clocks for "clocking-in" purposes;
– clocks incorporating electronic circuits only (IEC 60065, IEC 62368-1);
– watches.
This fifth edition cancels and replaces the fourth edition published in 2002 and Amendment 1: 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1);
c) application of test probe 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) introduction of limits on the temperature rise of external accessible surfaces (Clause 11).
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 2-26: Exigences particulières pour les horloges

L'IEC 60335-2-26:2024 traite de la sécurité des horloges électriques 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 liste suivante répertorie les exemples d'appareils qui relèvent du domaine d'application de la présente norme:
– les réveils;
– les horloges à entraînement par ressort qui comportent un mécanisme de remontage électrique;
– les horloges qui comprennent des moyens d'entraînement autres que des moteurs.
Dans la mesure du possible, la présente norme traite des dangers courants présentés par les appareils, encourus par toutes les personnes à l'intérieur et autour de l'habitation. Cependant, elle ne tient en général pas compte
– 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 prévus exclusivement pour des usages industriels;
– aux appareils destinés à être utilisés dans des locaux qui présentent des conditions particulières, telles que la présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz);
– aux horloges qui disposent d'autres fonctions, associées au non à l'indication de l'heure, telles que les horloges-mères et les minuteries de cuisinières, de machines à laver et d'appareils analogues;
– aux horloges pointeuses;
– aux horloges qui ne comportent que des circuits électroniques (IEC 60065, IEC 62368-1);
– aux montres.
Cette cinquième édition annule et remplace la quatrième édition parue en 2002 et l'Amendement 1:2008. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) alignement sur l'IEC 60335-1:2020;
b) conversion de certaines notes en texte normatif (Article 1);
c) application du calibre d'essai 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) instauration de limites d'échauffement pour les surfaces accessibles extérieures (Article 11).
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: 22-Aug-2024
• ICS: 13.120 - Domestic safety
• ICS: 97.040.50 - Small kitchen appliances
• 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: 23-Aug-2024
• Completion Date: 20-Sep-2024

Relations

• Revises: IEC 60335-2-26:2002/AMD1:2008 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-26: Particular requirements for clocks
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-26:2002 - Household and similar electrical appliances - Safety - Part 2-26: Particular requirements for clocks
• Effective Date: 05-Sep-2023

Overview - IEC 60335-2-26:2024 (Clocks safety)

IEC 60335-2-26:2024 is the fifth edition of the IEC safety standard that specifies particular requirements for the safety of household and similar electrical clocks rated up to 250 V (including DC and battery-operated appliances). It covers common hazards encountered in and around the home for devices such as alarm clocks, electrically wound spring clocks, and clocks driven by mechanisms other than motors. This edition is a technical revision that replaces the 2002 edition and Amendment 1 (2008) and is intended to be used together with the latest IEC 60335-1 general requirements.

Key topics and technical requirements

• Scope and exclusions: Applies to mains- and battery-powered domestic clocks; excludes industrial clocks, watches, clocking‑in systems, clocks with additional appliance-control functions (e.g., timers for cookers or washing machines), and devices solely with electronic circuits covered by IEC 60065 / IEC 62368‑1.
• Alignment with IEC 60335-1: Updated to conform with the 2020 edition of IEC 60335-1 for harmonized general safety requirements.
• Temperature and heating: Introduces limits on the temperature rise of externally accessible surfaces to reduce burn risks.
• Electrical safety tests: Requirements and test procedures for leakage current, electric strength, transient overvoltages, and insulation (see multiple test circuits and diagrams).
• Mechanical and stability tests: Protection against mechanical hazards, small parts, stability and robustness under normal and abnormal operation.
• Battery and charging safety: Normative Annex B covers battery-operated appliances, separable and detachable batteries, and safe charging considerations.
• Components and construction: Rules for internal wiring, components, switches, transformers, clearances/creepage distances, and resistance to heat, fire and rusting.
• Test details and annexes: Extensive annexes include motor ageing, switch/transformer tests, software evaluation (Annex R), UV‑C effects, and guidance for measurement methods.

Practical applications - who uses this standard

• Manufacturers and designers of electric and battery-operated clocks for product design, risk assessment and safe component selection.
• Test laboratories and certification bodies performing safety testing and conformity assessment to achieve market access and CE/IEC compliance.
• Regulatory and compliance teams ensuring products meet international safety requirements.
• R&D and quality assurance teams applying temperature, leakage and mechanical test regimes during development and production.

Related standards and notes

• Use in conjunction with IEC 60335-1 (general requirements).
• Clocks that are electronic-only may be covered by IEC 60065 or IEC 62368‑1.
• National health, labour and transport authorities may require additional country-specific rules for vehicle, ship or aircraft use.

Keywords: IEC 60335-2-26:2024, clock safety standard, household electrical appliances, alarm clocks, battery-operated clocks, IEC 60335-1, temperature rise limits, leakage current, product compliance.

Standards Content (Sample)

IEC 60335-2-26 ®
Edition 5.0 2024-08
COMMENTED VERSION
INTERNATIONAL
STANDARD
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inside
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks
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IEC 60335-2-26 ®
Edition 5.0 2024-08
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.120, 97.040.50 ISBN 978-2-8322-9612-7
– 2 – IEC 60335-2-26:2024 CMV © IEC 2024
CONTENTS
FOREWORD .4
INTRODUCTION .7
1 Scope .8
2 Normative references .9
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 .9
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 . 11
20 Stability and mechanical hazards . 11
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 12
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
29 Clearances, creepage distances and solid insulation . 13
30 Resistance to heat and fire . 13
31 Resistance to rusting. 13
32 Radiation, toxicity and similar hazards . 13
Annexes . 17
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 18
Bibliography . 19
List of comments . 20

Figure 101 – Examples of clocks within the scope of this standard . 14
Figure 102 – Examples of clocks out of the scope of this standard . 15

Figure 103 – Probe for measuring surface temperatures . 16

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 10

– 4 – IEC 60335-2-26:2024 CMV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

FOREWORD
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This commented version (CMV) of the official standard IEC 60335-2-26:2024 edition 5.0
allows the user to identify the changes made to the previous IEC 60335-2-
26:2002+AMD1:2008 CSV edition 4.1. Furthermore, comments from IEC TC 61 experts are
provided to explain the reasons of the most relevant changes, or to clarify any part of the
content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
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This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

IEC 60335-2-26 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002 and Amendment 1:
2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1);
c) application of test probe 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) introduction of limits on the temperature rise of external accessible surfaces (Clause 11).
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7266/FDIS 61/7284/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/publications.
A list of all parts of the IEC 60335 series, 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 clocks.
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.
– 6 – IEC 60335-2-26:2024 CMV © IEC 2024
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 following differences exist in the countries indicated below.
– 6.1: Class 0 appliances are allowed (Japan).
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 2 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations can 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.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

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 can 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 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. 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. 1
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. 2

– 8 – IEC 60335-2-26:2024 CMV © IEC 2024
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

1 Scope
This clause of Part 1 is replaced by the following.
This Part of IEC 60335 deals with the safety of electric clocks having a rated voltage not more
than 250 V including direct current (DC) supplied appliances and battery-operated
appliances. 3
NOTE 101 Examples of appliances that are within the scope of this standard are
– alarm clocks;
– spring-driven clocks with an electrically operated winding mechanism;
– clocks incorporating driving means other than motors.
NOTE See Figure 101 and Figure 102 for examples of clocks that are and are not covered by this standard.
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
– battery-operated clocks;
– appliances intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– clocks having other functions, whether or not in combination with time indication, such as
master control clocks and timers for cooking ranges, washing machines and similar
appliances;
– clocks for "clocking-in" purposes;
– clocks incorporating electronic circuits only (IEC 60065, IEC 62368-1);
– watches.
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.
3.1.9 Replacement Modification:
normal operation
Replace the first paragraph with the following:
operation of the clock under the following conditions:
Spring-driven clocks having an electrically operated winding mechanism are operated as in
normal use.
Other clocks are operated with the rotor locked.
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.
7 Marking and instructions
This clause of Part 1 is applicable.
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
For parts of appliances, other than wall or ceiling mounted appliances with installation
instructions that specify that installation must be above 850 mm above the floor, in addition to
the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test probe 18 is
used and with the same test conditions used for test probe 18. 4

– 10 – IEC 60335-2-26:2024 CMV © IEC 2024
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 103 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. 5
11.8 Modification:
Replace the first paragraph with the following:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101. 6
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
a
Temperature rise of external accessible surfaces
Surface
K
Surfaces of wall/ceiling- Surfaces of other appliances
mounted appliances situated
more than 850 mm above the
floor according to the
installation instructions after
installation
Bare metal 42
b
Coated metal
Glass and ceramic 56
c d
Plastic and plastic coating > 0,4 mm ,
NOTE The temperature rise limits of handles, knobs, grips, keyboards, keypads and similar parts are specified in
Table 3.
a
Temperature rises are not measured on the rear surface of wall-mounted appliances.
b
Metal is considered coated when a coating having a minimum thickness of 90 µm made of enamel, powder or
non-substantially plastic coating is used.
c
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
d
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
ceramic material apply.
12 Void Charging of metal-ion batteries
This clause of Part 1 is applicable. 7
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.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.7 Addition:
Spring-driven clocks, having an electrically operated winding mechanism incorporating
capacitors or resistors to reduce the motor voltage, are operated with the rotor locked,
capacitors or resistors being short-circuited one at a time.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.2 Addition:
For parts of appliances, other than wall or ceiling mounted appliances with installation
instructions that specify that installation must be above 850 mm above the floor, in addition to
the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test probe 18 is
used and with the same test conditions used for test probe 18. 8

– 12 – IEC 60335-2-26:2024 CMV © IEC 2024
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Modification:
The impact energy is reduced to 0,20 J.
The blows are not applied to spindles for hands.
The blows are only applied to dial glasses if the clock fails to comply with the requirements
of 8.1 with the dial glass removed.
22 Construction
This clause of Part 1 is applicable except as follows.
22.35 Addition:
NOTE 101 Hands are not considered as being actuated in normal use, unless they have to be are touched to alter
the time setting.
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.
25.3 Modification:
The connection to fixed wiring may be made before the clock has been fixed to its support
unless the clock is classified at least IPX1.
25.5 Addition:
Type Z attachment is allowed.
25.7 Addition:
The supply cords may be flat non-sheathed cords (code designation 60227 IEC 42).
25.19 Modification:
Polyvinyl chloride insulated cord is allowed to be tied into a simple overhand knot around a
smooth pin.
26 Terminals for external conductors
This clause of Part 1 is applicable.
27 Provision for earthing
This clause of Part 1 is 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.
30.2.2 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.

– 14 – IEC 60335-2-26:2024 CMV © IEC 2024

Connected directly to the supply mains
Analog clock Mechanical digital clock (Flip clock)

Connected to a detachable power supply part
Analog clock Mechanical digital clock (Flip clock)

Operated by batteries
Analog clock
Figure 101 – Examples of clocks within the scope of this standard

Connected directly to the supply mains
Digital clock with LCD
Connected to a detachable power supply part
Digital clock with LCD
Operated by batteries
Digital clock with LCD
Electronic analogue clock with clock-hands displayed on LCD

Figure 102 – Examples of clocks out of the scope of this standard 9

– 16 – IEC 60335-2-26:2024 CMV © IEC 2024

Key
A adhesive
B thermocouple wires 0,3 mm diameter 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 a flat contact face
Figure 103 – Probe for measuring surface temperatures

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

– 18 – IEC 60335-2-26:2024 CMV © IEC 2024
Annex B
(normative)
Battery-operated appliances, separable batteries
and detachable batteries for battery-operated appliances
This annex of Part 1 is applicable except as follows.
B.11.1 Modification:
Replace the first paragraph with the following:
For appliances operated with detachable batteries or separable batteries that are
disconnected from the appliance for charging purposes, the appliance is operated until it no
longer operates due to depletion of the battery or until steady conditions are established.
Replace the second paragraph with the following:
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 until it no longer operates due to
depletion of the battery or until steady conditions are established. 10
B.22.3 Addition:
In addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test
probe 18 is used and with the same test conditions used for test probe 18.
B.22.4 Addition:
In addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test
probe 18 is used and with the same test conditions used for test probe 18. 11

Bibliography
The Bibliography of Part 1 is applicable except as follows.
Addition:
ISO 13732-1, Ergonomics of the thermal environment – Methods for the assessment of human
responses to contact with surfaces – Part 1: Hot surfaces

– 20 – IEC 60335-2-26:2024 CMV © IEC 2024
List of comments
1 This revision is for alignment with IEC 60335-1:2020.
2 This revision is for alignment with IEC 60335-1:2020.
3 This revision is for alignment with IEC 60335-1:2020.
4 Appliance can be located on the floor or on surface below 850 mm where they would be
accessible to children up to 3 years in age, so test probe 19 is applicable. However, wall-
and ceiling-mounted appliances installed above 850 mm from the floor are not considered
to be within reach of these children, so test probe 19 is not applied.
5 Limits on the temperature rise of external accessible surfaces are introduced to address the
risk of thermal injury from contact with external accessible surfaces based on IEC Guide 117
for Temperatures of touchable hot surfaces.
6 Limits on the temperature rise of external accessible surfaces are introduced to address the
risk of thermal injury from contact with external accessible surfaces based on IEC Guide 117
for Temperatures of touchable hot surfaces.
7 This revision is for alignment with IEC 60335-1:2020.
8 Appliance can be located on the floor or on surface below 850 mm where they would be
accessible to children up to 3 years in age, so test probe 19 is applicable. However, wall-
and ceiling-mounted appliances installed above 850 mm from the floor are not considered
to be within reach of these children, so test probe 19 is not applied.
9 Due to the changes in the Scope to include battery-operated appliances, Figures 101 and
102 are added to clarify what types of clock are and are not covered by this standard.
10 Because battery-operated clocks may operate for many days before the battery is depleted,
operation until steady conditions are established is added as an option.
11 Battery-operated appliance can be located on the floor or on surfaces below 850 mm where
they would be accessible to children up to 3 years in age, so test probe 19 is applied to
battery-operated appliances, detachable batteries and separable batteries.
___________
IEC 60335-2-26 ®
Edition 5.0 2024-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-26: Exigences particulières pour les horloges
– 2 – IEC 60335-2-26:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
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 . 9
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 . 11
20 Stability and mechanical hazards . 11
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 12
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
29 Clearances, creepage distances and solid insulation . 13
30 Resistance to heat and fire . 13
31 Resistance to rusting . 13
32 Radiation, toxicity and similar hazards . 13
Annexes . 17
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 18
Bibliography . 19

Figure 101 – Examples of clocks within the scope of this standard. 14
Figure 102 – Examples of clocks out of the scope of this standard . 15
Figure 103 – Probe for measuring surface temperatures . 16

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 10

– 4 – IEC 60335-2-26:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

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
...

IEC 60335-2-26 ®
Edition 5.0 2024-08
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60335-2-26:2024 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks
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IEC 60335-2-26 ®
Edition 5.0 2024-08
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60335-2-26:2024 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.120; 97.040.50 ISBN 978-2-8322-9615-8

IEC 60335-1:2020/ISH1:2021 – 1 –
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0  2020-09
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –

Part 1: General requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 61: Safety of
household and similar electrical appliances.
The text of this Interpretation Sheet is based on the following documents:
Draft Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
___________
INTRODUCTION
Edition 6 of IEC 60335-1:2020 defines and introduces requirements for a detachable
power supply part of an appliance. In the document, 24.2 prohibits the use of a power
supply in a flexible cord.
QUESTION:
Does Subclause 24.2 prohibit the use of a detachable power supply part?
ANSWER
No, a "detachable power supply part" is a defined term and is not captured by the term
"power supply" as used in Subclause 24.2.
NOTE A detachable power supply part is captured by the defined term when the output of the power supply
part is detachable from the class III construction part of the appliance at:
– the power supply part, or
– the class III construction part of the appliance.
However, the supply cord (if any) does not have to be detachable from the detachable power supply part.
ICS 13.120; 97.030
IEC 60335-1:2020-09/ISH1:2021-11(en)

– 2 – IEC 60335-2-26:2024 EXV © IEC 2024
CONTENTS
FOREWORD . 6
INTRODUCTION to IEC 60335-1:2020 . 9
INTRODUCTION to IEC 60335-2-26:2024 . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 17
4 General requirement . 29
5 General conditions for the tests . 29
6 Classification . 33
7 Marking and instructions . 33
8 Protection against access to live parts . 42
9 Starting of motor-operated appliances . 44
10 Power input and current . 44
11 Heating . 46
12 Charging of metal-ion batteries . 52
13 Leakage current and electric strength at operating temperature . 53
14 Transient overvoltages . 56
15 Moisture resistance . 57
16 Leakage current and electric strength . 59
17 Overload protection of transformers and associated circuits . 61
18 Endurance . 62
19 Abnormal operation . 62
20 Stability and mechanical hazards . 72
21 Mechanical strength . 73
22 Construction . 75
23 Internal wiring . 88
24 Components . 90
25 Supply connection and external flexible cords . 94
26 Terminals for external conductors . 103
27 Provision for earthing . 105
28 Screws and connections . 107
29 Clearances, creepage distances and solid insulation . 109
30 Resistance to heat and fire . 118
31 Resistance to rusting . 122
32 Radiation, toxicity and similar hazards . 122
Annex A (informative) Routine tests . 139
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 141
Annex C (normative) Ageing test on motors . 162
Annex D (normative) Thermal motor protectors . 163
Annex E (normative) Needle-flame test . 164
Annex F (normative) Capacitors . 165

Annex G (normative) Safety isolating transformers . 167
Annex H (normative) Switches . 168
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 170
Annex J (normative) Coated printed circuit boards . 172
Annex K (informative) Overvoltage categories . 173
Annex L (informative) Guidance for the measurement of clearances and creepage

distances . 174
Annex M (informative) Pollution degree . 177
Annex N (normative) Proof tracking test . 178
Annex O (informative) Selection and sequence of the tests of Clause 30 . 179
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 184
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 186
Annex R (normative) Software evaluation . 189
Annex S (informative) Guidance for the application of this standard on measurement
of power input and current based on the requirements of 10.1 and 10.2 concerning the

representative period . 203
Annex T (normative) UV-C radiation effect on non-metallic materials . 204
Annex U (normative) Appliances intended for remote communication through public
networks . 207
Bibliography . 211
Index of defined terms . 214

Figure 1 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of class II appliances and for parts of class ll construction . 123
Figure 2 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of other than class II appliances or parts of class ll
construction . 124
Figure 3 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral class II appliances and for parts of class ll construction . 125
Figure 4 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral appliances other than those of class II or parts of class ll
construction . 126
Figure 5 – Small part . 127
Figure 6 – Example of an electronic circuit with low-power points . 127
Figure 7 – Test finger nail . 128
Figure 8 – Flexing test apparatus . 129
Figure 9 – Constructions of cord anchorages . 130
Figure 10 – An example of parts of an earthing terminal . 131
Figure 11 – Examples of clearances . 132
Figure 12 – Example of the placement of the cylinder . 133
Figure 13 – Small parts cylinder . 134
Figure 14 – Example of a specified operating region of a lithium-ion cell during
charging . 135
Figure 101 – Examples of clocks within the scope of this standard . 136
Figure 102 – Examples of clocks out of the scope of this standard . 137

– 4 – IEC 60335-2-26:2024 EXV © IEC 2024
Figure 103 – Probe for measuring surface temperatures . 138
Figure B.1 – Examples of battery-operated appliance constructions and application of
normative Annex B (1 of 2) . 160
Figure B.2 – Examples of correct polarity connection marking representing three
batteries . 161
Figure I.1 – Simulation of faults . 171
Figure L.1 – Sequence for the determination of clearances . 174
Figure L.2 – Sequence for the determination of creepage distances . 175
Figure L.3 – Measurement of clearances . 176
Figure O.1 – Tests for resistance to heat . 179
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 180
Figure O.3 – Selection and sequence of tests for resistance to fire in attended
appliances . 180
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended

appliances . 181
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 183
Figure Q.1 – Flowchart outlining the sequence of tests for the evaluation of electronic
circuits (1 of 2) . 187
Figure S.1 – Flowchart giving guidance on measurement of power input and current
concerning the representative period . 203

Table 1 – Power input deviation . 44
Table 2 – Current deviation . 45
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 48
Table 3 – Maximum normal temperature rises . 49
Table 4 – Voltage for electric strength test . 55
Table 5 – Characteristics of high-voltage sources . 56
Table 6 – Impulse test voltage . 56
Table 7 – Test voltages. 61
Table 8 – Maximum winding temperature . 64
Table 9 – Maximum abnormal temperature rise . 70
Table 10 – Dimensions of cables and conduits . 96
Table 11 – Minimum cross-sectional area of conductors . 98
Table 12 – Pull force and torque . 100
Table 13 – Nominal cross-sectional area of conductors . 104
Table 14 – Torque for testing screws and nuts . 108
Table 15 – Rated impulse voltage . 110
Table 16 – Minimum clearances . 111
Table 17 – Minimum creepage distances for basic insulation . 115
Table 18 – Minimum creepage distances for functional insulation . 116
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting
of a single layer . 118
Table A.1 – Test voltages . 140
Table B.1 – Artificial source characteristics . 143

Table B.2 – Total area of openings for metal-ion cells . 151
Table B.3 – Volume of air injected at 2 070 kPa . 151
Table C.1 – Test conditions . 162
Table R.1 – General fault/error conditions . 191
Table R.2 – Specific fault/error conditions . 193
Table R.3 – Semi-formal methods . 199
Table R.4 – Software architecture specification . 199
Table R.5 – Module design specification . 200
Table R.6 – Design and coding standards . 201
Table R.7 – Software safety validation . 201
Table T.1 – Minimum property retention limits after UV-C exposure . 205
Table T.2 – Minimum electric strength for internal wiring after UV-C exposure . 206
Table U.1 – Examples of acceptable measures against unauthorised access and
transmission fault/error modes . 209

– 6 – IEC 60335-2-26:2024 EXV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s).
IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect
'èèthereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which may
be required to implement this document. However, implementers are cautioned that this may not represent the
latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC shall
not be held responsible for identifying any or all such patent rights.
This extended version (EXV) of the official IEC Standard provides the user with the full
content of the Standard.
made to IEC 60335-1:2020.
The specific content of IEC 60335-2-26:2024 is displayed on a blue background.

IEC 60335-2-26 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002 and Amendment 1:
2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1);
c) application of test probe 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) introduction of limits on the temperature rise of external accessible surfaces (Clause 11).
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7266/FDIS 61/7284/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/publications.
A list of all parts of the IEC 60335 series, 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 clocks.
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.
– 8 – IEC 60335-2-26:2024 EXV © IEC 2024
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 following differences exist in the countries indicated below.
– 6.1: Class 0 appliances are allowed (Japan).
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 2 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations can 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.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION to IEC 60335-1:2020
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 –
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 the functions of an appliance are covered by different parts 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.
Throughout this publication, when "part 2" is mentioned, it refers to the relevant part of
IEC 60335.
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.
Individual countries may wish to consider the application of this standard, as far as is
reasonable, to appliances not mentioned in a part 2, and to appliances designed on new
principles. In this case, consideration should be given to defining normal operation, specifying
the classification of the appliance according to Clause 6 and specifying whether the appliance
is operated attended or unattended. Consideration should also be given to particular categories
of likely users and to related specific risks such as access to live parts, hot surfaces or

hazardous moving parts.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of this standard if, when examined and tested, it is found to
have other features which impair the level of safety covered by these requirements.

– 10 – IEC 60335-2-26:2024 EXV © IEC 2024
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 this
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.

INTRODUCTION to IEC 60335-2-26:2024
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 can 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.

– 12 – IEC 60335-2-26:2024 EXV © IEC 2024
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

1 Scope
This Part of IEC 60335 deals with the safety of electric clocks having a rated voltage not more
than 250 V including direct current (DC) supplied appliances and battery-operated appliances.
Examples of appliances that are within the scope of this standard are
– alarm clocks;
– spring-driven clocks with an electrically operated winding mechanism;
– clocks incorporating driving means other than motors.
NOTE See Figure 101 and Figure 102 for examples of clocks that are and are not covered by this standard.
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 intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– clocks having other functions, whether or not in combination with time indication, such as
master control clocks and timers for cooking ranges, washing machines and similar
appliances;
– clocks for "clocking-in" purposes;
– clocks incorporating electronic circuits only (IEC 60065, IEC 62368-1);
– watches.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60061-1, Lamp caps and holders together with gauges for the control of interchangeability
and safety – Part 1: Lamp caps
IEC 60065:2014, Audio, video and similar electronic apparatus – Safety requirements
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-31, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling shocks,
primarily for equipment-type specimens
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in
member countries of IEC
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
IEC 60112:2003/AMD1:2009
IEC 60127 (all parts), Miniature fuses
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
IEC 60227-5:2011, Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V – Part 5: Flexible cables (cords)
IEC 60238, Edison screw lampholders
IEC 60245 (all parts), Rubber insulated cables – Rated voltages up to and including 450/750 V
IEC 60252-1:2010, AC motor capacitors – Part 1: General – Performance, testing and rating –
Safety requirements – Guidance for installation and operation
IEC 60252-1:2010/AMD1:2013
IEC 60309-2, Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional
interchangeability requirements for pin and contact-tube accessories
IEC 60320 (all parts), Appliance couplers for household and similar general purposes
___________
There exists a consolidated edition 4.1:2009 that includes edition 4 and its Amendment 1.
There exists a consolidated edition 2.1:2013 that includes edition 2 and its Amendment 1.

– 14 – IEC 60335-2-26:2024 EXV © IEC 2024
IEC 60320-1, Appliance couplers for household and similar general purposes – Part 1: General
requirements
IEC 60320-2-3, Appliance couplers for household and similar general purposes – Part 2-3:
Appliance couplers with a degree of protection higher than IPX0
IEC 60320-3, Appliance couplers for household and similar general purposes – Part 3: Standard
sheets and gauges
IEC 60384-14:2013, Fixed capacitors for use in electronic equipment – Part 14: Sectional
specification – Fixed capacitors for electromagnetic interference suppression and connection
to the supply mains
IEC 60384-14:2013/AMD1:2016
IEC 60417, Graphical symbols for use on equipment
IEC 60445:2017, Basic and safety principles for man-machine interface, marking and
identification – Identification of equipment terminals, conductor terminations and conductors
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)

IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
IEC 60598-1:2014, Luminaires – Part 1: General requirements and tests
IEC 60598-1:2014/AMD1:2017
IEC 60603-11, Connectors for frequencies below 3 MHz for use with printed boards – Part 11:
Detail specification for concentric connectors (dimensions for free connectors and fixed
connectors)
IEC 60664-1:2007, Insulation coordination for equipment within low
...

IEC 60335-2-26 ®
Edition 5.0 2024-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-26: Particular requirements for clocks

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-26: Exigences particulières pour les horloges
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IEC 60335-2-26 ®
Edition 5.0 2024-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-26: Particular requirements for clocks

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-26: Exigences particulières pour les horloges

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120, 97.040.50 ISBN 978-2-8322-9561-8

– 2 – IEC 60335-2-26:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
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 . 9
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 . 11
20 Stability and mechanical hazards . 11
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 12
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
29 Clearances, creepage distances and solid insulation . 13
30 Resistance to heat and fire . 13
31 Resistance to rusting . 13
32 Radiation, toxicity and similar hazards . 13
Annexes . 17
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 18
Bibliography . 19

Figure 101 – Examples of clocks within the scope of this standard. 14
Figure 102 – Examples of clocks out of the scope of this standard . 15
Figure 103 – Probe for measuring surface temperatures . 16

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 10

– 4 – IEC 60335-2-26:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect 'èèthereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s),
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
https://patents.iec.ch. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60335-2-26 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002 and Amendment 1:
2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1);
c) application of test probe 19 (8.1.1, 20.2, B.22.3, B.22.4);
d) introduction of limits on the temperature rise of external accessible surfaces (Clause 11).

The text of this International Standard is based on the following documents:
Draft Report on voting
61/7266/FDIS 61/7284/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/publications.
A list of all parts of the IEC 60335 series, 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 clocks.
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.
The following differences exist in the countries indicated below.
– 6.1: Class 0 appliances are allowed (Japan).

– 6 – IEC 60335-2-26:2024 © IEC 2024
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 2 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations can 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.

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 can 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 60335-2-26:2024 © IEC 2024
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-26: Particular requirements for clocks

1 Scope
This clause of Part 1 is replaced by the following.
This Part of IEC 60335 deals with the safety of electric clocks having a rated voltage not more
than 250 V including direct current (DC) supplied appliances and battery-operated
appliances.
Examples of appliances that are within the scope of this standard are
– alarm clocks;
– spring-driven clocks with an electrically operated winding mechanism;
– clocks incorporating driving means other than motors.
NOTE See Figure 101 and Figure 102 for examples of clocks that are and are not covered by this standard.
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 intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– clocks having other functions, whether or not in combination with time indication, such as
master control clocks and timers for cooking ranges, washing machines and similar
appliances;
– clocks for "clocking-in" purposes;
– clocks incorporating electronic circuits only (IEC 60065, IEC 62368-1);
– watches.
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.
3.1.9 Modification:
normal operation
Replace the first paragraph with the following:
operation of the clock under the following conditions:
Spring-driven clocks having an electrically operated winding mechanism are operated as in
normal use.
Other clocks are operated with the rotor locked.
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.
7 Marking and instructions
This clause of Part 1 is applicable.
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
For parts of appliances, other than wall or ceiling mounted appliances with installation
instructions that specify that installation must be above 850 mm above the floor, in addition to
the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test probe 18 is
used and with the same test conditions used for test probe 18.

– 10 – IEC 60335-2-26:2024 © IEC 2024
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 103 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.
11.8 Modification:
Replace the first paragraph with the following:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
a
Temperature rise of external accessible surfaces
Surface
K
Surfaces of wall/ceiling- Surfaces of other appliances
mounted appliances situated
more than 850 mm above the
floor according to the
installation instructions after
installation
Bare metal 42
b
Coated metal
Glass and ceramic 56
c d
Plastic and plastic coating > 0,4 mm ,
NOTE The temperature rise limits of handles, knobs, grips, keyboards, keypads and similar parts are specified in
Table 3.
a
Temperature rises are not measured on the rear surface of wall-mounted appliances.
b
Metal is considered coated when a coating having a minimum thickness of 90 µm made of enamel, powder or
non-substantially plastic coating is used.
c
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
d
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
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.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.7 Addition:
Spring-driven clocks, having an electrically operated winding mechanism incorporating
capacitors or resistors to reduce the motor voltage, are operated with the rotor locked,
capacitors or resistors being short-circuited one at a time.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.2 Addition:
For parts of appliances, other than wall or ceiling mounted appliances with installation
instructions that specify that installation must be above 850 mm above the floor, in addition to
the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test probe 18 is
used and with the same test conditions used for test probe 18.

– 12 – IEC 60335-2-26:2024 © IEC 2024
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Modification:
The impact energy is reduced to 0,20 J.
The blows are not applied to spindles for hands.
The blows are only applied to dial glasses if the clock fails to comply with the requirements
of 8.1 with the dial glass removed.
22 Construction
This clause of Part 1 is applicable except as follows.
22.35 Addition:
NOTE 101 Hands are not considered as being actuated in normal use, unless they are touched to alter the time
setting.
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.
25.3 Modification:
The connection to fixed wiring may be made before the clock has been fixed to its support
unless the clock is classified at least IPX1.
25.5 Addition:
Type Z attachment is allowed.
25.7 Addition:
The supply cords may be flat non-sheathed cords (code designation 60227 IEC 42).
25.19 Modification:
Polyvinyl chloride insulated cord is allowed to be tied into a simple overhand knot around a
smooth pin.
26 Terminals for external conductors
This clause of Part 1 is applicable.
27 Provision for earthing
This clause of Part 1 is 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.
30.2.2 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.

– 14 – IEC 60335-2-26:2024 © IEC 2024

Connected directly to the supply mains
Analog clock Mechanical digital clock (Flip clock)

Connected to a detachable power supply part
Analog clock Mechanical digital clock (Flip clock)

Operated by batteries
Analog clock
Figure 101 – Examples of clocks within the scope of this standard

Connected directly to the supply mains
Digital clock with LCD
Connected to a detachable power supply part
Digital clock with LCD
Operated by batteries
Digital clock with LCD
Electronic analogue clock with clock-hands displayed on LCD

Figure 102 – Examples of clocks out of the scope of this standard

– 16 – IEC 60335-2-26:2024 © IEC 2024

Key
A adhesive
B thermocouple wires 0,3 mm diameter 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 a flat contact face
Figure 103 – Probe for measuring surface temperatures

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

– 18 – IEC 60335-2-26:2024 © IEC 2024
Annex B
(normative)
Battery-operated appliances, separable batteries
and detachable batteries for battery-operated appliances
This annex of Part 1 is applicable except as follows.
B.11.1 Modification:
Replace the second paragraph with the following:
For appliances operated with detachable batteries or separable batteries that are
disconnected from the appliance for charging purposes, the appliance is operated until it no
longer operates due to depletion of the battery or until steady conditions are established.
Replace the third paragraph with the following:
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 until it no longer operates due to
depletion of the battery or until steady conditions are established.
B.22.3 Addition:
In addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test
probe 18 is used and with the same test conditions used for test probe 18.
B.22.4 Addition:
In addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied wherever test
probe 18 is used and with the same test conditions used for test probe 18.

Bibliography
The Bibliography of Part 1 is applicable except as follows.
Addition:
ISO 13732-1, Ergonomics of the thermal environment – Methods for the assessment of human
responses to contact with surfaces – Part 1: Hot surfaces

___________
– 20 – IEC 60335-2-26:2024 © IEC 2024
SOMMAIRE
AVANT-PROPOS . 22
INTRODUCTION . 25
1 Domaine d'application . 26
2 Références normatives . 27
3 Termes et définitions . 27
4 Exigences générales . 27
5 Conditions générales d'essais . 27
6 Classification . 27
7 Marquage et instructions . 27
8 Protection contre l'accès aux parties actives. 28
9 Démarrage des appareils à moteur . 28
10 Puissance et courant . 28
11 Échauffements. 28
12 Charge des batteries à ions métalliques . 29
13 Courant de fuite et rigidité diélectrique à la température de régime . 29
14 Surtensions transitoires . 29
15 Résistance à l'humidité . 29
16 Courant de fuite et rigidité diélectrique . 29
17 Protection contre la surcharge des transformateurs et des circuits associés . 29
18 Endurance . 30
19 Fonctionnement anormal . 30
20 Stabilité et dangers mécaniques . 30
21 Résistance mécanique . 30
22 Construction . 30
23 Conducteurs internes. 30
24 Composants . 31
25 Raccordement au réseau et câbles souples extérieurs . 31
26 Bornes pour conducteurs externes . 31
27 Dispositions en vue de la mise à la terre . 31
28 Vis et connexions . 31
29 Distances dans l'air, lignes de fuite et isolation solide. 31
30 Résistance à la chaleur et au feu . 31
31 Protection contre la rouille . 32
32 Rayonnement, toxicité et dangers analogues . 32
Annexes . 35
Annexe B (normative) Appareils alimentés par batteries, batteries séparables et
batteries amovibles pour les appareils alimentés par batteries . 36
Bibliographie . 37

Figure 101 – Exemples d'horloges relevant du domaine d'application de la présente
norme . 32
Figure 102 – Exemples d'horloges ne relevant pas du domaine d'application de la
présente norme . 33

Figure 103 – Dispositif de mesure des températures de surface . 34

Tableau 101 – Échauffement maximaux pour les surfaces accessibles extérieures
spécifiées en conditions de fonctionnement normal . 29

– 22 – IEC 60335-2-26:2024 © IEC 2024
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
APPAREILS ÉLECTRODOMESTIQUES ET ANALOGUES –
SÉCURITÉ –
Partie 2-26: Exigences particulières pour les horloges

AVANT-PROPOS
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...