IEC 60335-2-98:2023

IEC 60335-2-98 ®
Edition 3.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-98:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
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IEC 60335-2-98 ®
Edition 3.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-98:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.030 ISBN 978-2-8322-7987-8
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 60335-2-98:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 15
4 General requirement . 27
5 General conditions for the tests . 27
6 Classification . 31
7 Marking and instructions . 31
8 Protection against access to live parts . 40
9 Starting of motor-operated appliances . 43
10 Power input and current . 43
11 Heating . 45
12 Charging of metal-ion batteries . 51
13 Leakage current and electric strength at operating temperature . 53
14 Transient overvoltages . 56
15 Moisture resistance . 56
16 Leakage current and electric strength . 59
17 Overload protection of transformers and associated circuits . 61
18 Endurance . 61
19 Abnormal operation . 61
20 Stability and mechanical hazards . 72
21 Mechanical strength . 73
22 Construction . 75
23 Internal wiring . 89
24 Components . 91
25 Supply connection and external flexible cords . 95
26 Terminals for external conductors . 104
27 Provision for earthing . 106
28 Screws and connections . 108
29 Clearances, creepage distances and solid insulation . 110
30 Resistance to heat and fire . 119
31 Resistance to rusting . 123
32 Radiation, toxicity and similar hazards . 123
Annex A (informative) Routine tests . 137
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 139
Annex C (normative) Ageing test on motors . 160
Annex D (normative) Thermal motor protectors . 161
Annex E (normative) Needle-flame test . 162
Annex F (normative) Capacitors . 163
Annex G (normative) Safety isolating transformers . 165

Annex H (normative) Switches . 166
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 168
Annex J (normative) Coated printed circuit boards . 170
Annex K (informative) Overvoltage categories . 171
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 172
Annex M (informative) Pollution degree . 175
Annex N (normative) Proof tracking test . 176
Annex O (informative) Selection and sequence of the tests of Clause 30 . 177
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 182
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 184
Annex R (normative) Software evaluation . 187
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 . 201
Annex T (normative) UV-C radiation effect on non-metallic materials . 202
Annex U (normative) Appliances intended for remote communication through public
networks . 205
Bibliography . 209
Index of defined terms . 212

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 . 124
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 . 125
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 . 126
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 . 127
Figure 5 – Small part . 128
Figure 6 – Example of an electronic circuit with low-power points . 128
Figure 7 – Test finger nail . 129
Figure 8 – Flexing test apparatus . 130
Figure 9 – Constructions of cord anchorages . 131
Figure 10 – An example of parts of an earthing terminal . 132
Figure 11 – Examples of clearances . 133
Figure 12 – Example of the placement of the cylinder . 134
Figure 13 – Small parts cylinder . 135
Figure 14 – Example of a specified operating region of a lithium-ion cell during
charging . 136
Figure 101 – Probe for measuring surface temperatures . 136
Figure B.1 – Examples of battery-operated appliance constructions and application of
normative Annex B (1 of 2) . 158

– 4 – IEC 60335-2-98:2023 EXV © IEC 2023
Figure B.2 – Examples of correct polarity connection marking representing three
batteries . 159
Figure I.1 – Simulation of faults . 169
Figure L.1 – Sequence for the determination of clearances . 172
Figure L.2 – Sequence for the determination of creepage distances . 173
Figure L.3 – Measurement of clearances . 174
Figure O.1 – Tests for resistance to heat . 177
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 178
Figure O.3 – Selection and sequence of tests for resistance to fire in attended
appliances . 178
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended
appliances . 179
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 181
Figure Q.1 – Flowchart outlining the sequence of tests for the evaluation of electronic

circuits (1 of 2) . 185
Figure S.1 – Flowchart giving guidance on measurement of power input and current
concerning the representative period . 201

Table 1 – Power input deviation . 43
Table 2 – Current deviation . 44
Table 3 – Maximum normal temperature rises . 48
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 51
Table 4 – Voltage for electric strength test . 55
Table 5 – Characteristics of high-voltage sources . 55
Table 6 – Impulse test voltage . 56
Table 7 – Test voltages. 60
Table 8 – Maximum winding temperature . 64
Table 9 – Maximum abnormal temperature rise . 70
Table 10 – Dimensions of cables and conduits . 97
Table 11 – Minimum cross-sectional area of conductors . 99
Table 12 – Pull force and torque . 101
Table 13 – Nominal cross-sectional area of conductors . 105
Table 14 – Torque for testing screws and nuts . 109
Table 15 – Rated impulse voltage . 111
Table 16 – Minimum clearances . 112
Table 17 – Minimum creepage distances for basic insulation . 116
Table 18 – Minimum creepage distances for functional insulation . 117
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting
of a single layer . 119
Table A.1 – Test voltages . 138
Table B.1 – Artificial source characteristics . 141
Table B.2 – Total area of openings for metal-ion cells . 149
Table B.3 – Volume of air injected at 2 070 kPa . 149
Table C.1 – Test conditions . 160

Table R.1 – General fault/error conditions . 189
Table R.2 – Specific fault/error conditions . 191
Table R.3 – Semi-formal methods . 197
Table R.4 – Software architecture specification . 197
Table R.5 – Module design specification . 198
Table R.6 – Design and coding standards . 199
Table R.7 – Software safety validation . 199
Table T.1 – Minimum property retention limits after UV-C exposure . 203
Table T.2 – Minimum electric strength for internal wiring after UV-C exposure . 204
Table U.1 – Examples of acceptable measures against unauthorised access and
transmission fault/error modes . 207

– 6 – IEC 60335-2-98:2023 EXV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

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
thereof. 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
comprehensive content of the Standard.
made to IEC 60335-1:2020.
The specific content of IEC 60335-2-98:2023 is displayed on a blue background.

IEC 60335-2-98 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This third edition cancels and replaces the second edition published in 2002,
Amendment 1:2004 and Amendment 2:2008. 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) additional requirements for a humidifier shaped or decorated like a toy (7.12, 8.1.1, 21.101,
22.12, 22.44, 22.54, 22.105);
c) additional requirements are included for the temperature of accessible surfaces (11.8);
d) application of test probes 18 and 19 has been introduced (Clause 8, 20.2, B.22.3, B.22.4);
e) additional guidance is provided for humidifiers for remote operation.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7013/FDIS 61/7086/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 electric humidifiers.
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;

– 8 – IEC 60335-2-98:2023 EXV © IEC 2023
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 4 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 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.

– 10 – IEC 60335-2-98:2023 EXV © IEC 2023
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

1 Scope
This part of IEC 60335 deals with the safety of electric humidifiers for household and similar
use, their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances, including direct current (DC) supplied appliances and battery-operated
appliances.
Examples of appliances that are within the scope of the standard are
– appliances that atomize water;
– appliances that evaporate water by heating;
– appliances that blow air through a moist element.
Appliances that are not intended for normal household use, but that nevertheless can be a
source of danger to the public, such as appliances intended to be used by laymen in shops, in
light industry and on farms, are within the scope of 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 for heating liquids (IEC 60335-2-15);
– humidifiers intended for use with heating, ventilation or air-conditioning systems
(IEC 60335-2-88);
– appliances for medical purposes (IEC 60601 series);
– 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).

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
___________
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.

– 12 – IEC 60335-2-98:2023 EXV © IEC 2023
IEC 60320 (all parts), Appliance couplers for household and similar general purposes
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-voltage systems – Part 1:
Principles, requirements and tests
IEC 60664-3:2016, Insulation coordination for equipment within low-voltage systems – Part 3:
Use of coating, potting or moulding for protection against pollution
IEC 60664-4:2005, Insulation coordination for equipment within low-voltage systems – Part 4:
Consideration of high-frequency voltage stress
IEC 60691, Thermal-links – Requirements and application guide
IEC 60695-2-11:2014, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products (GWEPT)
IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods – Glow-
wire flammability index (GWFI) test method for materials
___________
There exists a consolidated edition 4.1:2016 that includes edition 4 and its Amendment 1.
There exists a consolidated edition 2.2:2013 that includes edition 2 and its Amendment 1 and Amendment 2.
There exists a consolidated edition 8.1:2017 that includes edition 8 and its Amendment 1.

IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-
wire ignition temperature (GWIT) test method for materials
IEC 60695-10-2, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
IEC 60695-11-5:2016, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method
– Apparatus, confirmatory test arrangement and guidance
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60730-1:2013, Automatic electrical controls – Part 1: General requirements
IEC 60730-1:2013/AMD1:2015
IEC 60730-2-8:2018, Automatic electrical controls – Part 2-8: Particular requirements for
electrically operated water valves, including mechanical requirements
Automatic electrical controls – Part 2-9: Particular requirements for
IEC 60730-2-9:2015,
temperature sensing controls
IEC 60730-2-9:2015/AMD1:2018
IEC 60730-2-10, Automatic electrical controls for household and similar use – Part 2-10:
Particular requirements for motor-starting relays
IEC 60738-1, Thermistors – Directly heated positive temperature coefficient – Part 1: Generic
specification
IEC 60799, Electrical accessories – Cord sets and interconnection cord sets
IEC 60906-1, IEC system of plugs and socket-outlets for household and similar purposes –
Part 1: Plugs and socket-outlets 16 A 250 V a.c.
IEC 60934, Circuit-breakers for equipment (CBE)
IEC 60990:2016, Methods of measurement of touch current and protective conductor current
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
___________
There exists a consolidated edition 5.1:2015 that includes edition 5 and its Amendment 1.
There exists a consolidated edition 4.1:2018 that includes edition 4 and its Amendment 1.

– 14 – IEC 60335-2-98:2023 EXV © IEC 2023
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-11:2020, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measure-
ment techniques – Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current up to 16 A per phase
IEC 61000-4-13:2002, Electromagnetic
...

IEC 60335-2-98 ®
Edition 3.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-98:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
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IEC 60335-2-98 ®
Edition 3.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-98:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.030 ISBN 978-2-8322-7987-8
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 60335-2-98:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 15
4 General requirement . 27
5 General conditions for the tests . 27
6 Classification . 31
7 Marking and instructions . 31
8 Protection against access to live parts . 40
9 Starting of motor-operated appliances . 43
10 Power input and current . 43
11 Heating . 45
12 Charging of metal-ion batteries . 51
13 Leakage current and electric strength at operating temperature . 53
14 Transient overvoltages . 56
15 Moisture resistance . 56
16 Leakage current and electric strength . 59
17 Overload protection of transformers and associated circuits . 61
18 Endurance . 61
19 Abnormal operation . 61
20 Stability and mechanical hazards . 72
21 Mechanical strength . 73
22 Construction . 75
23 Internal wiring . 89
24 Components . 91
25 Supply connection and external flexible cords . 95
26 Terminals for external conductors . 104
27 Provision for earthing . 106
28 Screws and connections . 108
29 Clearances, creepage distances and solid insulation . 110
30 Resistance to heat and fire . 119
31 Resistance to rusting . 123
32 Radiation, toxicity and similar hazards . 123
Annex A (informative) Routine tests . 137
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 139
Annex C (normative) Ageing test on motors . 160
Annex D (normative) Thermal motor protectors . 161
Annex E (normative) Needle-flame test . 162
Annex F (normative) Capacitors . 163
Annex G (normative) Safety isolating transformers . 165

Annex H (normative) Switches . 166
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 168
Annex J (normative) Coated printed circuit boards . 170
Annex K (informative) Overvoltage categories . 171
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 172
Annex M (informative) Pollution degree . 175
Annex N (normative) Proof tracking test . 176
Annex O (informative) Selection and sequence of the tests of Clause 30 . 177
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 182
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 184
Annex R (normative) Software evaluation . 187
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 . 201
Annex T (normative) UV-C radiation effect on non-metallic materials . 202
Annex U (normative) Appliances intended for remote communication through public
networks . 205
Bibliography . 209
Index of defined terms . 212

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 . 124
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 . 125
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 . 126
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 . 127
Figure 5 – Small part . 128
Figure 6 – Example of an electronic circuit with low-power points . 128
Figure 7 – Test finger nail . 129
Figure 8 – Flexing test apparatus . 130
Figure 9 – Constructions of cord anchorages . 131
Figure 10 – An example of parts of an earthing terminal . 132
Figure 11 – Examples of clearances . 133
Figure 12 – Example of the placement of the cylinder . 134
Figure 13 – Small parts cylinder . 135
Figure 14 – Example of a specified operating region of a lithium-ion cell during
charging . 136
Figure 101 – Probe for measuring surface temperatures . 136
Figure B.1 – Examples of battery-operated appliance constructions and application of
normative Annex B (1 of 2) . 158

– 4 – IEC 60335-2-98:2023 EXV © IEC 2023
Figure B.2 – Examples of correct polarity connection marking representing three
batteries . 159
Figure I.1 – Simulation of faults . 169
Figure L.1 – Sequence for the determination of clearances . 172
Figure L.2 – Sequence for the determination of creepage distances . 173
Figure L.3 – Measurement of clearances . 174
Figure O.1 – Tests for resistance to heat . 177
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 178
Figure O.3 – Selection and sequence of tests for resistance to fire in attended
appliances . 178
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended
appliances . 179
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 181
Figure Q.1 – Flowchart outlining the sequence of tests for the evaluation of electronic

circuits (1 of 2) . 185
Figure S.1 – Flowchart giving guidance on measurement of power input and current
concerning the representative period . 201

Table 1 – Power input deviation . 43
Table 2 – Current deviation . 44
Table 3 – Maximum normal temperature rises . 48
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 51
Table 4 – Voltage for electric strength test . 55
Table 5 – Characteristics of high-voltage sources . 55
Table 6 – Impulse test voltage . 56
Table 7 – Test voltages. 60
Table 8 – Maximum winding temperature . 64
Table 9 – Maximum abnormal temperature rise . 70
Table 10 – Dimensions of cables and conduits . 97
Table 11 – Minimum cross-sectional area of conductors . 99
Table 12 – Pull force and torque . 101
Table 13 – Nominal cross-sectional area of conductors . 105
Table 14 – Torque for testing screws and nuts . 109
Table 15 – Rated impulse voltage . 111
Table 16 – Minimum clearances . 112
Table 17 – Minimum creepage distances for basic insulation . 116
Table 18 – Minimum creepage distances for functional insulation . 117
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting
of a single layer . 119
Table A.1 – Test voltages . 138
Table B.1 – Artificial source characteristics . 141
Table B.2 – Total area of openings for metal-ion cells . 149
Table B.3 – Volume of air injected at 2 070 kPa . 149
Table C.1 – Test conditions . 160

Table R.1 – General fault/error conditions . 189
Table R.2 – Specific fault/error conditions . 191
Table R.3 – Semi-formal methods . 197
Table R.4 – Software architecture specification . 197
Table R.5 – Module design specification . 198
Table R.6 – Design and coding standards . 199
Table R.7 – Software safety validation . 199
Table T.1 – Minimum property retention limits after UV-C exposure . 203
Table T.2 – Minimum electric strength for internal wiring after UV-C exposure . 204
Table U.1 – Examples of acceptable measures against unauthorised access and
transmission fault/error modes . 207

– 6 – IEC 60335-2-98:2023 EXV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

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
thereof. 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
comprehensive content of the Standard.
made to IEC 60335-1:2020.
The specific content of IEC 60335-2-98:2023 is displayed on a blue background.

IEC 60335-2-98 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This third edition cancels and replaces the second edition published in 2002,
Amendment 1:2004 and Amendment 2:2008. 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) additional requirements for a humidifier shaped or decorated like a toy (7.12, 8.1.1, 21.101,
22.12, 22.44, 22.54, 22.105);
c) additional requirements are included for the temperature of accessible surfaces (11.8);
d) application of test probes 18 and 19 has been introduced (Clause 8, 20.2, B.22.3, B.22.4);
e) additional guidance is provided for humidifiers for remote operation.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7013/FDIS 61/7086/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 electric humidifiers.
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;

– 8 – IEC 60335-2-98:2023 EXV © IEC 2023
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 4 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 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.

– 10 – IEC 60335-2-98:2023 EXV © IEC 2023
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

1 Scope
This part of IEC 60335 deals with the safety of electric humidifiers for household and similar
use, their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances, including direct current (DC) supplied appliances and battery-operated
appliances.
Examples of appliances that are within the scope of the standard are
– appliances that atomize water;
– appliances that evaporate water by heating;
– appliances that blow air through a moist element.
Appliances that are not intended for normal household use, but that nevertheless can be a
source of danger to the public, such as appliances intended to be used by laymen in shops, in
light industry and on farms, are within the scope of 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 for heating liquids (IEC 60335-2-15);
– humidifiers intended for use with heating, ventilation or air-conditioning systems
(IEC 60335-2-88);
– appliances for medical purposes (IEC 60601 series);
– 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).

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
___________
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.

– 12 – IEC 60335-2-98:2023 EXV © IEC 2023
IEC 60320 (all parts), Appliance couplers for household and similar general purposes
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-voltage systems – Part 1:
Principles, requirements and tests
IEC 60664-3:2016, Insulation coordination for equipment within low-voltage systems – Part 3:
Use of coating, potting or moulding for protection against pollution
IEC 60664-4:2005, Insulation coordination for equipment within low-voltage systems – Part 4:
Consideration of high-frequency voltage stress
IEC 60691, Thermal-links – Requirements and application guide
IEC 60695-2-11:2014, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products (GWEPT)
IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods – Glow-
wire flammability index (GWFI) test method for materials
___________
There exists a consolidated edition 4.1:2016 that includes edition 4 and its Amendment 1.
There exists a consolidated edition 2.2:2013 that includes edition 2 and its Amendment 1 and Amendment 2.
There exists a consolidated edition 8.1:2017 that includes edition 8 and its Amendment 1.

IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-
wire ignition temperature (GWIT) test method for materials
IEC 60695-10-2, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
IEC 60695-11-5:2016, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method
– Apparatus, confirmatory test arrangement and guidance
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60730-1:2013, Automatic electrical controls – Part 1: General requirements
IEC 60730-1:2013/AMD1:2015
IEC 60730-2-8:2018, Automatic electrical controls – Part 2-8: Particular requirements for
electrically operated water valves, including mechanical requirements
Automatic electrical controls – Part 2-9: Particular requirements for
IEC 60730-2-9:2015,
temperature sensing controls
IEC 60730-2-9:2015/AMD1:2018
IEC 60730-2-10, Automatic electrical controls for household and similar use – Part 2-10:
Particular requirements for motor-starting relays
IEC 60738-1, Thermistors – Directly heated positive temperature coefficient – Part 1: Generic
specification
IEC 60799, Electrical accessories – Cord sets and interconnection cord sets
IEC 60906-1, IEC system of plugs and socket-outlets for household and similar purposes –
Part 1: Plugs and socket-outlets 16 A 250 V a.c.
IEC 60934, Circuit-breakers for equipment (CBE)
IEC 60990:2016, Methods of measurement of touch current and protective conductor current
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and particular
2 2
requirements for clamping units for conductors from 0,2 mm up to 35 mm (included)
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
___________
There exists a consolidated edition 5.1:2015 that includes edition 5 and its Amendment 1.
There exists a consolidated edition 4.1:2018 that includes edition 4 and its Amendment 1.

– 14 – IEC 60335-2-98:2023 EXV © IEC 2023
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-11:2020, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measure-
ment techniques – Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current up to 16 A per phase
IEC 61000-4-13:2002, Electromagnetic
...

IEC 60335-2-98 ®
Edition 3.0 2023-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers

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IEC 60335-2-98 ®
Edition 3.0 2023-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.030 ISBN 978-2-8322-7986-1

– 2 – IEC 60335-2-98:2023 RLV © IEC 2023
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 . 10
8 Protection against access to live parts . 11
9 Starting of motor-operated appliances . 11
10 Power input and current . 11
11 Heating . 12
12 Void Charging of metal-ion batteries . 13
13 Leakage current and electric strength at operating temperature . 13
14 Transient overvoltages . 13
15 Moisture resistance . 14
16 Leakage current and electric strength . 14
17 Overload protection of transformers and associated circuits . 14
18 Endurance . 14
19 Abnormal operation . 14
20 Stability and mechanical hazards . 15
21 Mechanical strength . 15
22 Construction . 15
23 Internal wiring . 17
24 Components . 17
25 Supply connection and external flexible cords . 17
26 Terminals for external conductors . 17
27 Provision for earthing . 17
28 Screws and connections . 17
29 Clearances, creepage distances and solid insulation . 17
30 Resistance to heat and fire . 18
31 Resistance to rusting . 18
32 Radiation, toxicity and similar hazards . 18
Annexes . 19
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 20
Bibliography . 21

Figure 101 – Probe for measuring surface temperatures . 18

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 13

– 4 – IEC 60335-2-98:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

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,
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) 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 thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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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 redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60335-2-98:2002+AMD1:2004+AMD2:2008 CSV. A
vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text.

IEC 60335-2-98 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This third edition cancels and replaces the second edition published in 2002,
Amendment 1:2004 and Amendment 2:2008. 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) additional requirements for a humidifier shaped or decorated like a toy (7.12, 8.1.1, 21.101,
22.12, 22.44, 22.54, 22.105);
c) additional requirements are included for the temperature of accessible surfaces (11.8);
d) application of test probes 18 and 19 has been introduced (Clause 8, 20.2, B.22.3, B.22.4);
e) additional guidance is provided for humidifiers for remote operation.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7013/FDIS 61/7086/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 electric humidifiers.
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;

– 6 – IEC 60335-2-98:2023 RLV © IEC 2023
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 4 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.
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 60335-2-98:2023 RLV © IEC 2023
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric humidifiers for household and similar
use, their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances, including direct current (DC) supplied appliances and battery-operated
appliances.
NOTE 101 Examples of appliances that are within the scope of the standard are
– appliances that atomize water;
– appliances that evaporate water by heating;
– appliances that blow air through a moist element.
Appliances that are not intended for normal household use, but that nevertheless may can be
a source of danger to the public, such as appliances intended to be used by laymen in shops,
in light industry and on farms, are within the scope of 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
– appliances for heating liquids (IEC 60335-2-15);
– humidifiers intended for use with heating, ventilation or air-conditioning systems
(IEC 60335-2-88);
– appliances for medical purposes (IEC 60601 series);
– 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).

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
3 Terms and Definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.6 Addition:
Note 101 to entry: For electrode-type appliances, if no current is assigned to the appliance, the rated current is
calculated from the rated voltage and the mean value of the power input during the first 2 min of operation, the
appliance being supplied at rated voltage and operated under normal operation.
3.1.9 Replacement Modification:
Replace the first paragraph with the following:
normal operation
operation of the appliance under the following conditions:
The appliance is filled with the maximum quantity of water in accordance with the instructions,
unless the appliance is connected to the water mains and the supply is automatically controlled.
For electrode-type appliances, the water has a resistivity of approximately 500 Ωcm at a
temperature of 20 °C.
Note 101 to entry: The appropriate resistivity may be obtained by adding sodium chloride to the water.
3.5 Definitions relating to types of appliances
3.5.101
electrode-type appliance
appliance in which a conductive liquid is heated by a current flowing through it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.6 Addition:
Humidistats are short-circuited or rendered inoperative.
6 Classification
This clause of Part 1 is applicable.

– 10 – IEC 60335-2-98:2023 RLV © IEC 2023
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Modification Addition:
Electrode-type appliances shall be marked with their rated power input.
Addition:
Appliances that are manually filled shall have a level mark or other means to indicate when they
are filled to their rated capacity, unless they cannot be filled beyond this capacity. This
indication shall be visible when the appliance is being filled.
If the temperature of the water vapour exceeds 60 °C, the appliance shall be marked with
symbol IEC 60417-5597 (2002-102014-06) or with the substance of the following:
CAUTION: Hot water vapour
NOTE 101 This symbol is a warning sign and the rules of ISO 3864-1 apply.
7.6 Addition:
[symbol IEC 60417-5597 (2002-10
Steam, low jet
(2014-06)]
7.12 Addition:
The instructions shall include details regarding filling, cleaning and descaling.
The instructions shall state the substance of the following:
– care should be taken when using the appliance due to the emission of hot water vapour;
– unplug the appliance during filling and cleaning.
The instructions for electrode-type appliances shall include the substance of the following:
– the composition and quantity of solution to be used and advice not to use an excessive
amount of salt;
– the appliance is not to be operated from a DC supply.
If symbol IEC 60417-5597 (2002-102014-06) is used, its meaning shall be explained.
The instructions for a humidifier shaped or decorated like a toy shall include the substance of
the following:
This is not a toy. This is an electrical appliance and must be operated and maintained by an
adult. In addition to the water to be vaporised, only any additional liquids advised by the
manufacturer for cleaning or fragrance shall be used.
7.12.1 Addition:
The installation instructions for appliances intended to be connected to the water mains shall
state the maximum permissible water pressure in pascals.

Instructions for fixed appliances intended for installation more than 850 mm from the floor in
normal use shall include the substance of the following:
Mount this product more than 850 mm from the floor.
7.15 Addition:
Symbol IEC 60417-5597 (2002-102014-06) or the marking relating to hot water vapour shall be
near the vapour outlet.
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 situated not more than 850 mm above the floor after installation or in
normal use according to the instructions, in addition to the use of test probe 18, test probe 19
of IEC 61032 is also applied as specified for test probe 18. For humidifiers shaped or decorated
like a toy, test probe 19 of IEC 61032 is also applied to parts situated more than 850 mm above
the floor according to the instructions.
Test probe 18 of IEC 61032 is not applied to appliances that, according to the instructions, are
required to be mounted at a height of more than 1,8 m above the floor.
When test probes 18 and 19 of IEC 61032 are applied to the functional part of a humidifier
shaped or decorated like a toy, any detachable parts shall be removed unless a tool is required
for removal.
8.1.3 Addition:
Test probe 19 of IEC 61032 is not applied.
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 except as follows.
10.1 Addition:
For electrode-type appliances, the negative deviation is not limited.

– 12 – IEC 60335-2-98:2023 RLV © IEC 2023
11 Heating
This clause of Part 1 is applicable except as follows.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.4 Modification Addition:
Electrode-type appliances are supplied at 1,06 times rated voltage.
Addition:
If the temperature rise limits are exceeded in appliances incorporating motors, transformers or
electronic circuits, and the power input is lower than the rated power input, the test is
repeated with the appliance supplied at 1,06 times rated voltage.
11.6 Replacement:
Combined appliances are operated as heating appliances.
11.7 Replacement Modification:
Replace the first paragraph with the following:
Appliances are operated until steady conditions are established.
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.
Addition:
The temperature rise limits of motors, transformers and components of electronic circuits,
including parts directly influenced by them, may be exceeded when the appliance is operated
at 1,15 times rated power input.
The temperature rise of handles or grips of vents and air shutters shall not exceed the value
specified in Table 3 for surfaces of handles, knobs, grips and similar parts which are held for
short periods only in normal use.

Table 101 – Maximum temperature rises
for specified external accessible surfaces under normal operating conditions
a
Surface
Temperature rise of external accessible surfaces
K
Surfaces of Surfaces of Surfaces of other
appliances shaped appliances not appliances more
or decorated like a more than 850 mm than 850 mm above
toy above the floor the floor when
installed or in
normal use
Bare metal 29 38 42
b
30 42 49
Coated metal
Glass and ceramic 40 51 56
c, d
45 58 62
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 rise on surfaces that are inaccessible to a 75 mm diameter probe having a hemispherical end are
not measured.
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.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.1 Modification Addition:
Electrode-type appliances are supplied at 1,06 times rated voltage.
13.2 Addition:
For electrode-type appliances, the leakage current is measured between a metallic mesh
placed in the water vapour, 10 mm from the outlet, and accessible metal parts including the
metal foil.
The leakage current shall not exceed 0,25 mA.
14 Transient overvoltages
This clause of Part 1 is applicable.

– 14 – IEC 60335-2-98:2023 RLV © IEC 2023
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:
In case of doubt, the spillage test is carried out with the appliance deviating from the normal
position of use by an angle not exceeding 5°.
Appliances intended to be connected to the water mains are operated until the maximum water
level is reached. The inlet valve is held open and the filling continued for 15 min after the first
evidence of overflow or until the inflow stops automatically.
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.
19.2 Addition:
The container of electrode-type appliances is filled with a saturated solution of NaCl
at 20 °C ± 5 °C, the appliance being supplied at rated voltage.
NOTE 101 A solution is saturated when no more salt can be dissolved.
19.3 Addition:
The test is not applicable to electrode-type appliances.
19.4 Modification Addition:
Appliances are only filled with sufficient the amount of water necessary to cover the heating
elements.
Fans are switched off.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.2 Addition:
For parts of appliances situated not more than 850 mm above the floor after installation or in
normal use according to the instructions, in addition to the use of test probe 18, test probe 19
of IEC 61032 is also applied as specified for test probe 18. For humidifiers shaped or decorated
like a toy, test probe 19 of IEC 61032 is also applied to parts situated more than 850 mm above
the floor according to the instructions.
During the test with test probe 19, humidifiers having a filter system for air cleaning function
are assembled without any filters removed. However, when test probe 18 and test probe 19 of
IEC 61032 are applied to the functional part of a humidifier shaped or decorated like a toy, any
detachable parts shall be removed unless a tool is required for removal.
Test probe 18 of IEC 61032 is not applied to appliances that, according to the instructions, are
required to be mounted at a height of more than 1,8 m above the floor.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.101 The functional part of a humidifier shaped or decorated like a toy shall be constructed
to withstand dropping that can be expected in normal use. Any parts that are loosened or
become dislodged as a result of dropping shall not present a choking hazard.
Compliance is checked by the following test.
The functional part of the appliance is dropped from a height of 500 mm above a concrete or
similar hard surface.
The test is carried out a total of five times with the functional part of the appliance being
positioned so that it falls onto the surface in five different orientations.
The appliance shall not be damaged to such an extent that compliance with 20.2 is impaired.
Any parts that become dislodged or loosened to the point that they are no longer non-
detachable parts shall not be contained within the small parts cylinder in Figure 13.
22 Construction
This clause of Part 1 is applicable except as follows.
22.6 Addition:
Drain holes A drain hole that is needed to comply with this standard shall be at least 5 mm in
diameter or 20 mm in area with a minimum dimension of at least 3 mm. Holes that do not meet
these dimensions are considered to be blocked when determining compliance.
Compliance is checked by measurement.
22.12 Addition:
– 16 – IEC 60335-2-98:2023 RLV © IEC 2023
For humidifiers shaped or decorated like a toy, all accessible parts shall be fixed in a reliable
manner so that they will not work loose in normal use if loosening could result in a choking
hazard.
22.33 Modification:
Replace the second paragraph with the following:
Liquids may be heated using electrodes and may be in direct contact with their live parts.
22.40 Addition:
These appliances are not considered to be appliances that could give rise to a hazard when
operated continuously, automatically or remotely.
22.44 Modification:
Replace the first paragraph with the following:
Humidifiers shall not be shaped or decorated like a toy unless:
– ultrasonic transducers are not accessible to test probe 19 of IEC 61032 during normal use;
– they do not evaporate water by heating; and
– the water reservoir capacity does not exceed 4 l.
22.49 Not applicable
22.51 Not applicable
22.54 Addition:
For humidifiers shaped or decorated like a toy, button cells and batteries designated R1 shall
not be accessible without the aid of a tool.
22.101 The vapour outlet of appliances incorporating means for heating water shall be free
from obstructions that could give rise to a significant pressure within the container. The
container shall be vented to the atmosphere, the aperture being at least 5 mm in diameter or
20 mm in area with a minimum dimension of at least 3 mm.
Compliance is checked by inspection and by measurement.
22.102 Appliances for wall mounting shall have reliable a provision for fixing to a wall,
independent of the connection to the water mains.
Compliance is checked by inspection.
22.103 Electrode-type appliances shall be constructed to ensure that when the filling
aperture of the container is open, both electrodes are disconnected to provide all-pole
disconnection under overvoltage category III conditions.
This requirement does not apply to an appliance that requires the withdrawal of an appliance
connector in order to gain access to the filling aperture.
Compliance is checked by inspection.

22.104 Appliances intended to be connected to the water mains shall withstand the water
pressure expected in normal use.
Compliance is checked by connecting the appliance to a water supply having a pressure equal
to twice the maximum inlet water pressure or 1,2 MPa, whichever is the higher, for a period of
5 min.
There shall be no leakage.
22.105 The functional part of a humidifier shaped or decorated like a toy shall be class III
construction with a working voltage of no more than 24 V.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable except as follows.
24.101 Thermal cut-outs incorporated in appliances for compliance with Clause 19 shall not
be a self-resetting thermal cut-out.
Compliance is checked by inspection.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable.
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 except as follows.
29.2 Addition:
For electrode-type appliances, the microenvironment of the insulation supporting the
electrodes is pollution degree 3.

– 18 – IEC 60335-2-98:2023 RLV © IEC 2023
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.

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 101 – Probe for measuring surface temperatures

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

– 20 – IEC 60335-2-98:2023 RLV © IEC 2023
Annex B
(normative)
Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances
Annex B of Part 1 is applicable except as follows.
22 Construction
B.22.3 Addition:
For humidifiers shaped or decorated like a toy and humidifiers intended to be located 850 mm
or less from the floor, test probe 19 is also applied as specified for test probe 18.
When test probes 18 and 19 of IEC 61032 are applied to the functional part of a humidifier
shaped or decorated like a toy, any detachable parts shall be removed unless a tool is required
for removal.
B.22.4 Addition:
For humidifiers shaped or decorated like a toy and humidifiers intended to be located 850 mm
or less from the floor, test probe 19 is also applied as specified for test probe 18.
When test probes 18 and 19 of IEC 61032 are applied to separable batteries or detachable
batteries of a humidifier shaped or decorated like a toy, any detachable parts shall be removed
unless a tool is required for removal.
B.22.101 The working voltage of the functional part of a humidifier shaped or decorated like
a toy shall not exceed 24 V.
Compliance is checked by inspection and by measurement.

Bibliography
The bibliography of Part 1 is applicable except as follows.
Addition:
IEC 60335-2-15, Household and similar electrical appliances − Safety − Part 2-15: Particular
requirements for appliances for heating liquids
IEC 60335-2-88, Household and similar electrical appliances – Safety – Part 2-88: Particular
requirements for humidifiers intended for use with heating, ventilation, or air-conditioning
systems
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs in workplaces and public areas safety markings
ISO 13732-1, Ergonomics of the thermal environment – Methods for the assessment of human
responses to contact with surfaces – Part 1: Hot surfaces

___________
IEC 60335-2-98 ®
Edition 3.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-98: Exigences particulières pour les humidificateurs
– 2 – IEC 60335-2-98:2023 © IEC 2023
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 . 10
8 Protection against acc
...

IEC 60335-2-98 ®
Edition 3.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-98: Exigences particulières pour les humidificateurs
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IEC 60335-2-98 ®
Edition 3.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-98: Particular requirements for humidifiers

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-98: Exigences particulières pour les humidificateurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.030  ISBN 978-2-8322-7952-6

– 2 – IEC 60335-2-98:2023 © IEC 2023
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 . 10
8 Protection against access to live parts . 11
9 Starting of motor-operated appliances . 11
10 Power input and current . 11
11 Heating . 12
12 Charging of metal-ion batteries . 13
13 Leakage current and electric strength at operating temperature . 13
14 Transient overvoltages . 13
15 Moisture resistance . 14
16 Leakage current and electric strength . 14
17 Overload protection of transformers and associated circuits . 14
18 Endurance . 14
19 Abnormal operation . 14
20 Stability and mechanical hazards . 15
21 Mechanical strength . 15
22 Construction . 15
23 Internal wiring . 17
24 Components . 17
25 Supply connection and external flexible cords . 17
26 Terminals for external conductors . 17
27 Provision for earthing . 17
28 Screws and connections . 17
29 Clearances, creepage distances and solid insulation . 17
30 Resistance to heat and fire . 18
31 Resistance to rusting . 18
32 Radiation, toxicity and similar hazards . 18
Annexes . 19
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 20
Bibliography . 21

Figure 101 – Probe for measuring surface temperatures . 18

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 13

– 4 – IEC 60335-2-98:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

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 thereof. 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 60335-2-98 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This third edition cancels and replaces the second edition published in 2002,
Amendment 1:2004 and Amendment 2:2008. 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) additional requirements for a humidifier shaped or decorated like a toy (7.12, 8.1.1, 21.101,
22.12, 22.44, 22.54, 22.105);
c) additional requirements are included for the temperature of accessible surfaces (11.8);

d) application of test probes 18 and 19 has been introduced (Clause 8, 20.2, B.22.3, B.22.4);
e) additional guidance is provided for humidifiers for remote operation.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7013/FDIS 61/7086/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 electric humidifiers.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
notes: in small roman type.
–
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.

– 6 – IEC 60335-2-98:2023 © IEC 2023
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 4 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 60335-2-98:2023 © IEC 2023
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric humidifiers for household and similar
use, their rated voltage being not more than 250 V for single-phase appliances and 480 V for
other appliances, including direct current (DC) supplied appliances and battery-operated
appliances.
Examples of appliances that are within the scope of the standard are
– appliances that atomize water;
– appliances that evaporate water by heating;
– appliances that blow air through a moist element.
Appliances that are not intended for normal household use, but that nevertheless can be a
source of danger to the public, such as appliances intended to be used by laymen in shops, in
light industry and on farms, are within the scope of 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 for heating liquids (IEC 60335-2-15);
– humidifiers intended for use with heating, ventilation or air-conditioning systems
(IEC 60335-2-88);
– appliances for medical purposes (IEC 60601 series);
– 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).

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.6
Note 101 to entry: For electrode-type appliances, if no current is assigned to the appliance, the rated current is
calculated from the rated voltage and the mean value of the power input during the first 2 min of operation, the
appliance being supplied at rated voltage and operated under normal operation.
3.1.9 Modification:
Replace the first paragraph with the following:
operation of the appliance under the following conditions:
The appliance is filled with the maximum quantity of water in accordance with the instructions,
unless the appliance is connected to the water mains and the supply is automatically controlled.
For electrode-type appliances, the water has a resistivity of approximately 500 Ωcm at a
temperature of 20 °C.
Note 101 to entry: The appropriate resistivity may be obtained by adding sodium chloride to the water.
3.5 Definitions relating to types of appliances
3.5.101
electrode-type appliance
appliance in which a conductive liquid is heated by a current flowing through it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.6 Addition:
Humidistats are short-circuited or rendered inoperative.
6 Classification
This clause of Part 1 is applicable.

– 10 – IEC 60335-2-98:2023 © IEC 2023
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Electrode-type appliances shall be marked with their rated power input.
Appliances that are manually filled shall have a level mark or other means to indicate when they
are filled to their rated capacity, unless they cannot be filled beyond this capacity. This
indication shall be visible when the appliance is being filled.
If the temperature of the water vapour exceeds 60 °C, the appliance shall be marked with
symbol IEC 60417-5597 (2014-06) or with the substance of the following:
CAUTION: Hot water vapour
NOTE 101 This symbol is a warning sign and the rules of ISO 3864-1 apply.
7.6 Addition:
[symbol IEC 60417-5597
Steam, low jet
(2014-06)]
7.12 Addition:
The instructions shall include details regarding filling, cleaning and descaling.
The instructions shall state the substance of the following:
– care should be taken when using the appliance due to the emission of hot water vapour;
– unplug the appliance during filling and cleaning.
The instructions for electrode-type appliances shall include the substance of the following:
– the composition and quantity of solution to be used and advice not to use an excessive
amount of salt;
– the appliance is not to be operated from a DC supply.
If symbol IEC 60417-5597 (2014-06) is used, its meaning shall be explained.
The instructions for a humidifier shaped or decorated like a toy shall include the substance of
the following:
This is not a toy. This is an electrical appliance and must be operated and maintained by an
adult. In addition to the water to be vaporised, only any additional liquids advised by the
manufacturer for cleaning or fragrance shall be used.
7.12.1 Addition:
The installation instructions for appliances intended to be connected to the water mains shall
state the maximum permissible water pressure in pascals.
Instructions for fixed appliances intended for installation more than 850 mm from the floor in
normal use shall include the substance of the following:
Mount this product more than 850 mm from the floor.

7.15 Addition:
Symbol IEC 60417-5597 (2014-06) or the marking relating to hot water vapour shall be near the
vapour outlet.
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 situated not more than 850 mm above the floor after installation or in
normal use according to the instructions, in addition to the use of test probe 18, test probe 19
of IEC 61032 is also applied as specified for test probe 18. For humidifiers shaped or decorated
like a toy, test probe 19 of IEC 61032 is also applied to parts situated more than 850 mm above
the floor according to the instructions.
Test probe 18 of IEC 61032 is not applied to appliances that, according to the instructions, are
required to be mounted at a height of more than 1,8 m above the floor.
When test probes 18 and 19 of IEC 61032 are applied to the functional part of a humidifier
shaped or decorated like a toy, any detachable parts shall be removed unless a tool is required
for removal.
8.1.3 Addition:
Test probe 19 of IEC 61032 is not applied.
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 except as follows.
10.1 Addition:
For electrode-type appliances, the negative deviation is not limited.

– 12 – IEC 60335-2-98:2023 © IEC 2023
11 Heating
This clause of Part 1 is applicable except as follows.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.4 Addition:
Electrode-type appliances are supplied at 1,06 times rated voltage.
Addition:
If the temperature rise limits are exceeded in appliances incorporating motors, transformers or
electronic circuits, and the power input is lower than the rated power input, the test is
repeated with the appliance supplied at 1,06 times rated voltage.
11.6 Replacement:
Combined appliances are operated as heating appliances.
11.7 Modification:
Replace the first paragraph with the following:
Appliances are operated until steady conditions are established.
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.
Addition:
The temperature rise limits of motors, transformers and components of electronic circuits,
including parts directly influenced by them, may be exceeded when the appliance is operated
at 1,15 times rated power input.
The temperature rise of handles or grips of vents and air shutters shall not exceed the value
specified in Table 3 for surfaces of handles, knobs, grips and similar parts which are held for
short periods only in normal use.

Table 101 – Maximum temperature rises
for specified external accessible surfaces under normal operating conditions
a
Surface
Temperature rise of external accessible surfaces
K
Surfaces of Surfaces of Surfaces of other
appliances shaped appliances not appliances more
or decorated like a more than 850 mm than 850 mm above
toy above the floor the floor when
installed or in
normal use
Bare metal 29 38 42
b
30 42 49
Coated metal
Glass and ceramic 40 51 56
c, d
45 58 62
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 rise on surfaces that are inaccessible to a 75 mm diameter probe having a hemispherical end are
not measured.
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 except as follows.
13.1 Addition:
Electrode-type appliances are supplied at 1,06 times rated voltage.
13.2 Addition:
For electrode-type appliances, the leakage current is measured between a metallic mesh
placed in the water vapour, 10 mm from the outlet, and accessible metal parts including the
metal foil.
The leakage current shall not exceed 0,25 mA.
14 Transient overvoltages
This clause of Part 1 is applicable.

– 14 – IEC 60335-2-98:2023 © IEC 2023
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:
In case of doubt, the spillage test is carried out with the appliance deviating from the normal
position of use by an angle not exceeding 5°.
Appliances intended to be connected to the water mains are operated until the maximum water
level is reached. The inlet valve is held open and the filling continued for 15 min after the first
evidence of overflow or until the inflow stops automatically.
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.
19.2 Addition:
The container of electrode-type appliances is filled with a saturated solution of NaCl
at 20 °C ± 5 °C, the appliance being supplied at rated voltage.
NOTE 101 A solution is saturated when no more salt can be dissolved.
19.3 Addition:
The test is not applicable to electrode-type appliances.
19.4 Addition:
Appliances are only filled with the amount of water necessary to cover the heating elements.
Fans are switched off.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.2 Addition:
For parts of appliances situated not more than 850 mm above the floor after installation or in
normal use according to the instructions, in addition to the use of test probe 18, test probe 19
of IEC 61032 is also applied as specified for test probe 18. For humidifiers shaped or decorated
like a toy, test probe 19 of IEC 61032 is also applied to parts situated more than 850 mm above
the floor according to the instructions.
During the test with test probe 19, humidifiers having a filter system for air cleaning function
are assembled without any filters removed. However, when test probe 18 and test probe 19 of
IEC 61032 are applied to the functional part of a humidifier shaped or decorated like a toy, any
detachable parts shall be removed unless a tool is required for removal.
Test probe 18 of IEC 61032 is not applied to appliances that, according to the instructions, are
required to be mounted at a height of more than 1,8 m above the floor.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.101 The functional part of a humidifier shaped or decorated like a toy shall be constructed
to withstand dropping that can be expected in normal use. Any parts that are loosened or
become dislodged as a result of dropping shall not present a choking hazard.
Compliance is checked by the following test.
The functional part of the appliance is dropped from a height of 500 mm above a concrete or
similar hard surface.
The test is carried out a total of five times with the functional part of the appliance being
positioned so that it falls onto the surface in five different orientations.
The appliance shall not be damaged to such an extent that compliance with 20.2 is impaired.
Any parts that become dislodged or loosened to the point that they are no longer non-
detachable parts shall not be contained within the small parts cylinder in Figure 13.
22 Construction
This clause of Part 1 is applicable except as follows.
22.6 Addition:
A drain hole that is needed to comply with this standard shall be at least 5 mm in diameter or
20 mm in area with a minimum dimension of at least 3 mm. Holes that do not meet these
dimensions are considered to be blocked when determining compliance.
Compliance is checked by measurement.
22.12 Addition:
– 16 – IEC 60335-2-98:2023 © IEC 2023
For humidifiers shaped or decorated like a toy, all accessible parts shall be fixed in a reliable
manner so that they will not work loose in normal use if loosening could result in a choking
hazard.
22.33 Modification:
Replace the second paragraph with the following:
Liquids may be heated using electrodes and may be in direct contact with their live parts.
22.40 Addition:
These appliances are not considered to be appliances that could give rise to a hazard when
operated continuously, automatically or remotely.
22.44 Modification:
Replace the first paragraph with the following:
Humidifiers shall not be shaped or decorated like a toy unless:
– ultrasonic transducers are not accessible to test probe 19 of IEC 61032 during normal use;
– they do not evaporate water by heating; and
– the water reservoir capacity does not exceed 4 l.
22.49 Not applicable
22.51 Not applicable
22.54 Addition:
For humidifiers shaped or decorated like a toy, button cells and batteries designated R1 shall
not be accessible without the aid of a tool.
22.101 The vapour outlet of appliances incorporating means for heating water shall be free
from obstructions that could give rise to a significant pressure within the container. The
container shall be vented to the atmosphere, the aperture being at least 5 mm in diameter or
20 mm in area with a minimum dimension of at least 3 mm.
Compliance is checked by inspection and by measurement.
22.102 Appliances for wall mounting shall have a provision for fixing to a wall, independent of
the connection to the water mains.
Compliance is checked by inspection.
22.103 Electrode-type appliances shall be constructed to ensure that when the filling
aperture of the container is open, both electrodes are disconnected to provide all-pole
disconnection under overvoltage category III conditions.
This requirement does not apply to an appliance that requires the withdrawal of an appliance
connector in order to gain access to the filling aperture.
Compliance is checked by inspection.

22.104 Appliances intended to be connected to the water mains shall withstand the water
pressure expected in normal use.
Compliance is checked by connecting the appliance to a water supply having a pressure equal
to twice the maximum inlet water pressure or 1,2 MPa, whichever is the higher, for a period of
5 min.
There shall be no leakage.
22.105 The functional part of a humidifier shaped or decorated like a toy shall be class III
construction with a working voltage of no more than 24 V.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable except as follows.
24.101 Thermal cut-outs incorporated in appliances for compliance with Clause 19 shall not
be a self-resetting thermal cut-out.
Compliance is checked by inspection.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable.
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 except as follows.
29.2 Addition:
For electrode-type appliances, the microenvironment of the insulation supporting the
electrodes is pollution degree 3.

– 18 – IEC 60335-2-98:2023 © IEC 2023
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.

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 101 – Probe for measuring surface temperatures

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

– 20 – IEC 60335-2-98:2023 © IEC 2023
Annex B
(normative)
Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances
Annex B of Part 1 is applicable except as follows.
22 Construction
B.22.3 Addition:
For humidifiers shaped or decorated like a toy and humidifiers intended to be located 850 mm
or less from the floor, test probe 19 is also applied as specified for test probe 18.
When test probes 18 and 19 of IEC 61032 are applied to the functional part of a humidifier
shaped or decorated like a toy, any detachable parts shall be removed unless a tool is required
for removal.
B.22.4 Addition:
For humidifiers shaped or decorated like a toy and humidifiers intended to be located 850 mm
or less from the floor, test probe 19 is also applied as specified for test probe 18.
When test probes 18 and 19 of IEC 61032 are applied to separable batteries or detachable
batteries of a humidifier shaped or decorated like a toy, any detachable parts shall be removed
unless a tool is required for removal.
B.22.101 The working voltage of the functional part of a humidifier shaped or decorated like
a toy shall not exceed 24 V.
Compliance is checked by inspection and by measurement.

Bibliography
The bibliography of Part 1 is applicable except as follows.
Addition:
IEC 60335-2-15, Household and similar electrical appliances − Safety − Part 2-15: Particular
requirements for appliances for heating liquids
IEC 60335-2-88, Household and similar electrical appliances – Safety – Part 2-88: Particular
requirements for humidifiers intended for use with heating, ventilation, or air-conditioning
systems
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs and safety markings
ISO 13732-1, Ergonomics of the thermal environment – Methods for the assessment of human
responses to contact with surfaces – Part 1: Hot surf
...