IEC 60335-2-53:2026

IEC 60335-2-53 ®
Edition 5.0 2026-10
INTERNATIONAL
STANDARD
REDLINE VERSION
Household and similar electrical appliances - Safety -
Part 2-53: Particular requirements for sauna heating appliances and infrared
cabins
ICS 97.100.10 ISBN 978-2-8327-1562-8
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CONTENTS
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 11
5 General conditions for the tests . 11
6 Classification . 11
7 Marking and instructions . 12
8 Protection against access to live parts . 15
9 Starting of motor-operated appliances . 15
10 Power input and current . 15
11 Heating . 16
12 Void Charging of metal-ion batteries . 18
13 Leakage current and electric strength at operating temperature . 18
14 Transient overvoltages . 18
15 Moisture resistance . 18
16 Leakage current and electric strength . 19
17 Overload protection of transformers and associated circuits . 19
18 Endurance . 19
19 Abnormal operation . 19
20 Stability and mechanical hazards . 22
21 Mechanical strength . 22
22 Construction . 23
23 Internal wiring . 26
24 Components . 26
25 Supply connection and external flexible cords . 26
26 Terminals for external conductors . 27
27 Provision for earthing . 27
28 Screws and connections . 27
29 Clearances, creepage distances and solid insulation . 27
30 Resistance to heat and fire . 27
31 Resistance to rusting . 27
32 Radiation, toxicity and similar hazards . 27
Annexes . 32
Annex R (normative) Software evaluation . 32
Annex AA (normative) Sauna room for testing sauna heating appliances . 33
Annex BB (normative) Estimation of the infrared radiation . 35
Bibliography . 38

Figure 103 101 – Examples of different types of sauna heating appliances . 29
Figure 102 – Probe for measuring surface temperatures . 30
Figure 101 103 – Temperature/relative humidity characteristic during normal operation . 31
Figure 102 104 – Temperature/relative humidity characteristic during abnormal
operation . 31
Figure AA.1 – Sauna room . 34
Figure BB.1 – Estimation of maximum irradiance . 37

Table 101 – Maximum temperature rises for specified external accessible surfaces on
the outside of the sauna room of prefabricated saunas and the outside of the infrared
cabin of prefabricated infrared cabins under normal operating conditions . 18
Table 101 102 – Volume of sauna room . 19

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household and similar electrical appliances - Safety -
Part 2-53: Particular requirements for sauna
heating appliances and infrared cabins

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
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) 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 redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 60335-2-53:2011+AMD1:2017+AMD2:2021 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 60335-2-53 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2011, Amendment 1:2017
and Amendment 2:2021. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1, 7.1, 7.14, 19.101, 19.104, 22.101,
22.104);
c) clarification and addition of requirements for sauna heaters with a thermal storage function
(Clause 1, 3.1.9, 3.5.101, 3.8.103, 5.3, 7.1, 7.12, 10.1, 10.2, 13.1, 19.1, 19.105);
d) addition of test probe 19 for accessibility of live parts and moving parts not more than
850 mm above the floor (8.1.1, 8.1.3, 20.2);
e) addition of surface temperatures for external accessible surfaces outside the sauna room
or infrared cabin (11.3, 11.8);
f) clarifications related to the use of the terms "control" and "protective device" (3.5.102,
3.6.102, 5.9, 6.2. 7.7, 7.12.1, 22.105, 24.102, Figure 101).
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7626/FDIS 61/7661/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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) with amendment 1
(2025) 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: Safety requirements for sauna heating appliances and
infrared cabins.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan);
– 19.101: Sauna heating appliances provided with a programmable timer are considered to
be appliances that are used by remote operation (Finland).
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.
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.
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.
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.
NOTE 1 For example, if sauna heating appliances within the scope of this part 2 include a humidifier unit, then
IEC 60335-2-98 is applicable as far as is reasonable.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 2 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 3 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.
Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance
with this document may involve the use of a patent.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from:
Klafs GmbH & Co. KG
Markus Gaebele (markus.gaebele@klafs.de)
Address
Erich-Klafs-Straße 1-3
D-74523 Schwaebisch Hall
Germany
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
IEC (http://patents.iec.ch) maintains on-line data bases of patents relevant to its standards.
Users are encouraged to consult the database for the most up to date information concerning
patents.
1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric sauna heating appliances and infrared
emitting units having a rated power input not exceeding 20 kW, their rated voltage being not
more than 250 V for single-phase appliances and 480 V for other appliances.
The appliances covered by this standard are intended for use in the home and in public saunas
located in blocks of flats, hotels and similar locations.
NOTE 101 Sauna heating appliances may be of the thermal storage type.
This standard also applies to prefabricated saunas, prefabricated infrared cabins and sauna
heaters provided with a thermal storage function.
This standard also deals with the safety of electric sauna heating appliances provided with a
humidifier unit, their rated voltage being not more than 250 V for single-phase appliances and
480 V for other appliances. The room air is humidified by evaporating or atomising water.
NOTE 102 101 A humidifier may can be part of a sauna heating appliance or may can be incorporated in the
sauna heater. The sauna heating appliance or sauna heater may can be operated with or without the humidifier.
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 103 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 104 This standard does not apply to
– 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);
– appliances intended to cause perspiration to only a part of the human body;
– sweating baths where the head of the user remains outside the heated space;
– tents and other collapsible sauna baths;
– room heaters (IEC 60335-2-30);
– humidifiers intended for use with heating, ventilation, or air-conditioning systems
(IEC 60335-2-88);
– humidifiers (IEC 60335-2-98);
– appliances intended for medical purposes (IEC 60601).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60335-1:2020, Household and similar electrical appliances - Safety - Part 1: General
requirements
IEC 60335-1:2020/AMD1:2025
IEC 60584-1, Thermocouples - Part 1: EMF specifications and tolerances
ISO 3864-1, Graphical symbols - Safety colours and safety signs - Part 1: Design principles for
safety signs in workplaces and public areas safety markings
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.9 Replacement Modification:
normal operation
Replace the first paragraph with the following:
operation of the appliance under the following conditions:
Sauna heating appliances, sauna heaters, infrared emitters and infrared emitting units
are installed in the sauna room specified in normative Annex AA and in accordance with the
instructions. The volume of the sauna room is the minimum value specified in the instructions.
The rock container is filled in accordance with the instructions. If the capacity of the rock
container is adjustable, the container is filled with the most unfavourable quantity of rocks. If
the rock container has a lid, the lid is positioned in accordance with the instructions.
Prefabricated saunas and prefabricated infrared cabins are installed in accordance with the
instructions.
Sauna heaters provided with a thermal storage function are first operated with the lid or similar
means closed for the thermal storage period. The appliance is then operated with the lid or
similar means opened.
3.5 Definitions relating to types of appliances
3.5.101
sauna heater
appliance incorporating heating elements having a container filled with appropriate rocks
Note 1 to entry: A sauna heater of the thermal storage type is provided with a lid or similar means for limiting
thermal energy transfer to a sauna room and is supplied from the mains during the thermal storage period.
Note 2 to entry: A sauna heater can also be provided with a humidifier.
3.5.102
sauna heating appliance
appliance comprising a sauna heater, controls, protective devices user interface and control
board
3.1055.103
infrared emitting unit
appliance comprising at least one infrared emitter, controls, protective devices user interface
and control board
3.1035.104
prefabricated sauna
assembly comprising a sauna room and a sauna heating appliance that is delivered as one
unit
Note 1 to entry: Prefabricated saunas can include also an infrared emitter, in which case the requirements of
both prefabricated saunas and prefabricated infrared cabins are applicable.
3.1065.105
prefabricated infrared cabin
assembly comprising a cabin and at least one infrared emitting unit that is delivered as one
unit
Note 1 to entry: Prefabricated infrared emitters can include also a sauna heating appliance, in which case the
requirements of both prefabricated saunas and prefabricated infrared cabins are applicable.
3.6 Definitions relating to parts of an appliance
3.1046.101
infrared emitter
assembly that emits infrared radiation
3.1076.102
fireguard
part of the enclosure of an infrared emitter through which the infrared emitter is normally
visible and which is intended to guard against direct access to the infrared emitter
Note 1 to entry: The infrared emitter can be visible through the fireguard.
3.1096.103
control board
unit connected to a sauna heater or an infrared emitter and intended to control a sauna heater
or an infrared emitter
Note 1 to entry: Control boards can include protective devices. Control boards can be integrated with a sauna
heater or connected with a cable to a sauna heater. See Figure 103 Figure 101.
3.1106.104
programmable timer
time-based control which continues with a subsequent cycle when the preceding one has been
completed
3.8 Definitions relating to miscellaneous matters
3.1088.101
time pre-selection
switching on a sauna heater within a prefabricated sauna with a delay
3.1118.102
supervised operation
supervision by monitoring person(s) who can be physically present to observe first-hand, or a
combination of physical presence and remote viewing of data to indicate condition and operation
of the appliance
3.8.103
thermal storage period
operating period when a sauna heater of the thermal storage type is supplied from the mains
and the lid is closed or similar means are limiting thermal energy transfer to a sauna room
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.
5.2 Addition:
If the appliance comprises more than one sauna heater or more than one infrared emitter,
these are tested together.
5.3 Addition:
For appliances where both sauna and humidifying operation is possible, the tests for sauna
operation are made first, followed immediately by the tests for humidifying. The thermostats
and humidity controls, if any, are initially set to their maximum setting.
For appliances provided with a thermal storage function, the tests for the thermal storage
period are made after the heater has reached stable conditions or after 24 h, whichever occurs
first followed immediately by the tests for the sauna heater condition.
5.9 Addition:
Sauna heaters and infrared emitters shall be tested with the controls user interfaces and
control boards specified in the instructions that give the most unfavourable results.
5.101 If a ventilating fan operates independently of the heating element, the tests are carried
out with or without the fan in operation, whichever is more unfavourable.
5.102 If a combination of sauna-heating appliancesheaters and infrared emitting units
emitters is to be tested, the devices are assembled according to the assembly instructions and
the tests are carried out under the most unfavourable conditions.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Replace the first paragraph with the following:
Appliances shall be class I, class II or class III.
6.2 Addition:
Appliances, controls, protective devices and control boardsParts of sauna heating
appliances and parts of infrared emitting units intended to be mounted inside a sauna room
shall be at least IPX4.
Electrical components of prefabricated saunas shall be at least IPX4.
Infrared emitters, controls and protective devicesParts of infrared emitting units intended
to be mounted inside an infrared cabin shall be at least IPX2.
Infrared emitters, controls and protective devices intended to be mounted inside a cabin in
combination with a sauna-heating appliance shall be at least IPX4.
Electrical components of prefabricated infrared cabins shall be at least IPX2.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Sauna heaters and infrared emitters shall be marked with symbol ISO 7000-0790 (2004-01)
or with the substance of the following:
Read operator's manual.
They shall also be marked with:
– the minimum distance between the top of the heater and the ceiling of the sauna room;
– the minimum distance between the bottom of the heater and the floor of the sauna room,
unless this distance is determined by the construction of the heater;
– the minimum horizontal distance between the heater and any combustible material of the
sauna room, including a protective rail, unless these distances are determined by the
construction of the heater;
– the maximum depth and minimum width of the recess for sauna heaters intended to be
installed in a recess.
Sauna heaters and infrared emitters shall be marked with symbol IEC 60417-5641 (2002-10)
combined with the prohibition sign of ISO 3864-1, except for colours, or with the substance of
the following:
WARNING: Do not cover.
The inside wall of prefabricated saunas or prefabricated infrared cabins shall be marked
near the sauna heater or infrared emitter with the symbol IEC 60417-5641 (2002-10)
combined with the prohibition sign of ISO 3864-1, except for colours, or the substance of the
following:
WARNING: Covering the heater or infrared emitter causes fire risk
Unless the sauna heater complies with Clause 11 without rock in the container, sauna heaters
shall be marked with the substance of the following:
WARNING: An inadequately filled rock container causes fire risk
NOTE 101 This warning is not required if the sauna heater complies with Clause 11 without rocks in the container.
7.6 Addition:
do not cover
NOTE 101 This symbol incorporates symbol IEC 60417-5641 (2002-10) combined with the prohibition sign of
ISO 3864-1, except for colours.
7.7 Addition:
Control boards shall have a connection diagram that gives details of the electrical connections
for controls and protective devices user interfaces, temperature sensors and other electrical
components, if any.
NOTE 101 The connection diagram may can also show connections, other than those required, provided the
additional information does not cause confusion.
NOTE 102 If more than one control board is provided, the connection diagram may can be divided so that each
control board has its own connection diagram and a reference to the other control boards.
7.12 Addition:
The instructions for sauna heaters shall state how to fill the rock container.
The instructions for sauna heating appliances and infrared emitting units for public saunas
and infrared cabins that do not have a timer or programmable timer shall state that the
appliance is to be operated supervised. The instructions for sauna heating appliances and
infrared emitting units that have a timer shall state that the sauna room or infrared cabin shall
be inspected before restarting the timer or before switching on the appliance.
The instructions for prefabricated infrared cabins and the instructions for prefabricated
saunas incorporating infrared emitters shall state that cleaning with steam cleaners, high
pressure cleaners and spraying water is not allowed.
If the appliances are marked with the symbol IEC 60417-5641 (2002-10) combined with the
prohibition sign of ISO 3864-1 except for colours, the meaning shall be explained.
The instructions for infrared emitters shall include the substance of the following:
– it is recommended that the infrared cabin should not be used within 24 h after UV radiation
exposure from artificial sources or sun-bathing;
– individuals who may can be at risk from hyperthermia, such as individuals suffering from
cardiovascular disease, should seek medical advice before use of infrared warming cabins;
– when persistent erythema (reddening of the skin lasting more than a day) and netlike colour
changes persist after regular exposure to infrared radiation, exposure should not be
repeated, and medical advice should be sought to prevent development of erythema ab
igne;
– if you are a person with compromised heat pain sensation or under the influence of alcohol
or tranquilizers, you should not use infrared warming cabins.
7.12.1 Addition:
The installation instructions of sauna heaters intended for a recessed installation shall give
details of the proper installation in a recessed area and state that means that prevent
combustible objects being placed on the top of the heater have to shall be installed in the air
channel above the heater.
NOTE 101 For example, an air outlet grill or guard spaced a minimum 40 mm from any heated surfaces beneath,
whose dimensions of the opening do not exceed 53 mm × 20 mm or 126 mm × 12 mm, is considered to be a suitable
means.
The installation instructions for prefabricated saunas and prefabricated infrared cabins shall
give details on how to assemble the appliance.
The installation instructions for sauna heating appliances and infrared emitting units shall
include the following details:
– the minimum and maximum volume, in cubic metres, of the sauna room or cabin in which
the sauna heater or infrared emitter is intended to be installed;
– the minimum height of the sauna room or cabin;
– the materials to be used for the walls and the ceiling of the sauna room or cabin;
– the arrangement of the separate protective rail, if applicable;
– the means of ventilating the sauna room or cabin;
– the installation of adjacent sauna heaters or infrared emitters or a statement that the
sauna heater or infrared emitter must be used alone;
– the connection and position of controls user interfaces in the sauna room or cabin;
– that thermostat sensors shall be installed so that they are not influenced by incoming air;
– the installation of the control board, including a statement that the control board must be
mounted outside the sauna room or cabin (not necessary if the control board is at least
IPX4);
– the type of cable for supplying of the sauna heater or infrared emitter;
– installation location of any temperature sensor in relation to the sauna heater within the
sauna room or to the infrared emitter within the infrared cabin.
The instructions for infrared emitters shall state:
– the minimum distance between the top of an infrared emitter and the ceiling of the cabin;
– the minimum distance from the bottom of an infrared emitter to the floor of the cabin and
to other flammable surfaces, unless this distance is determined by the construction of the
infrared emitter;
– the minimum horizontal distance between an infrared emitter and any combustible material
of the cabin, including a protective rail, unless these distances are determined by the
construction of the infrared emitter;
– the minimum distance between adjacent infrared emitters.
The instructions for appliances for supervised operation in public saunas or infrared cabins
that do not have a timer shall state that a pilot lamp or similar indication showing that the sauna
heater or infrared emitter is switched on is to be installed where visible to the monitoring
person.
Unless the sauna heater complies with the test of 19.101 or 19.102 as appropriate, the
instructions for sauna heating appliances or infrared emitting units that incorporate a stand-
by mode setting for remote operation shall state that the door of the sauna room or infrared
cabin shall be fitted with an interlock such that the stand-by mode setting for remote operation
is disabled if the sauna room door or infrared cabin door is opened when the stand-by mode
setting for remote operation is set.
The instructions shall state the model number or type reference of controls user interfaces and
control boards that can be used with a sauna heater or an infrared emitter.
7.12.101 The instructions for sauna heating appliances shall list the accessories intended
to be used as additional protection against thermal burn injury which are suitable for use with
the heater and shall include necessary information concerning correct mounting.
7.12.102 If the infrared emitter is user replaceable, the instructions shall state that the
infrared emitter is only to be replaced with a type specified by the appliance manufacturer.
7.14 Addition:
The marking of distances to combustible material of the sauna room or cabin shall be clearly
visible from the outside of the sauna heater or infrared emitter without removing covers.
The warnings concerning fire risks shall be visible after the sauna heater or infrared emitter
has been installed. They may be placed on a recessed low part of the sauna heater or infrared
emitter. The lettering shall have a height of at least
– 5 mm, for headings;
– 3 mm, for other lettering.
NOTE 101 These warnings may be placed on a recessed low part of the sauna heater or infrared emitter.
7.101 The appliance shall be marked with instruction to replace infrared emitters with the
exact same manufacturer and model of emitter.
Compliance is checked by inspection.
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, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied
wherever test probe 18 is used and with the same test conditions used for test probe 18.
8.1.3 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.
11 Heating
This clause of Part 1 is applicable except as follows.
11.2 Addition:
The test is also carried out with the rock container empty unless the sauna heater is marked
with the warning concerning an inadequately filled rock container.
The sauna room of normative Annex AA, prefabricated saunas and prefabricated infrared
cabins are installed away from the walls of the test corner.
Modification:
Appliances normally intended to be placed on a floor in normal use, are placed on the floor as
near to the walls as possible the construction permits, taking into account the instructions.
11.3 Addition:
Temperature rises in front of the sauna heater are measured on a movable wooden rod painted
dull black placed vertically on the floor. The rod has dimensions approximately 20 mm by 20 mm
and has sufficient a length to extend at least 400 mm above the highest point of the sauna
heater or for sauna heaters containing rocks, the highest point of the rocks. The distance
between the rod and the heater is the minimum horizontal distance marked on the heater. For
infrared emitters, the vertical distance between the rod and the emitter is varied so as to attain
the highest temperature. The horizontal distance between the rod and the emitter is the
minimum horizontal distance stated in the instructions.
NOTE 101 If it is indicated that the minimum horizontal distance varies with the height from the floor, the
measurements are made accordingly.
Where the external accessible surfaces on the outside of the sauna room of prefabric
...

IEC 60335-2-53 ®
Edition 5.0 2026-10
INTERNATIONAL
STANDARD
EXTENDED VERSION
This full version of IEC 60335-2-53:2026 includes the content of the references made
to IEC 60335-1:2020+AMD1:2025
Household and similar electrical appliances - Safety -
Part 2-53: Particular requirements for sauna heating appliances and infrared
cabins
ICS 97.100.10 ISBN 978-2-8327-1563-5

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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.

IEC 60335-1:2020-09/ISH1:2021-11(en)

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0  2020-09
Household and similar electrical appliances - Safety -
Part 1: General requirements
INTERPRETATION SHEET 2
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:
DISH Report on voting
61/7436/DISH 61/7464/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.

___________
TC 61 interpretation sheet on: Mechanical shock and vibration testing on large metal-ion
batteries of IEC 60335-1:2020
INTRODUCTION
Currently the standard mentions:
B.24.1 The relevant standards for non-acid based electrolyte cells employed in batteries
are IEC 62133-1:2017 for nickel systems and IEC 62133-2:2017 for lithium systems.
NOTE The requirement for cells does not extend to the battery itself.
A battery that uses metal-ion chemistry shall additionally be subjected to the tests of
Subclauses 7.3.8.1 (vibration) and 7.3.8.2 (mechanical shock) of IEC 62133-2:2017.
When Annex B was written for the IEC 60335-1 edition 6, the batteries foreseen were for
portable applications and rather lightweight. The IEC 62133-2:2017 standard referred to is
applicable to portable lithium batteries only.

IEC 60335-1:2020-09/ISH2:2025-08(en-fr)

For non-portable and/or large batteries (mass > 12 kg), the tests of IEC 62133-2 for mechanical
shock and vibration are not suitable.
QUESTION:
What test sequence for mechanical shock and vibration can be followed for large batteries?
ANSWER:
For practical reasons, IEC 60335-1 should follow the same differentiation as the UN 38.3
transport test or IEC 62281 standard (Safety of primary and secondary lithium cells and
batteries during transport).
For larger batteries with a mass exceeding 12 kg, Subclauses 6.4.3 (Test T-3: Vibration) and
6.4.4 (Test T-4: Shock) of IEC 62281:2019, including AMD1:2021 and AMD2:2023, may be
applied.
NOTE 1 The tests are technically identical to Test T.3 and Test T.4 of the UN manual of tests and criteria, section
38.3 rev.8 (2023).
NOTE 2 In accordance with Table 5 of IEC 62281:2019, testing is carried out on the battery without packaging.

CONTENTS
FOREWORD . 5
INTRODUCTION to IEC 60335-1:2020+AMD1:2025 CSV . 8
INTRODUCTION to IEC 60335-2-53:2026 . 10
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 17
4 General requirement . 30
5 General conditions for the tests . 30
6 Classification . 35
7 Marking and instructions . 35
8 Protection against access to live parts . 47
9 Starting of motor-operated appliances . 49
10 Power input and current . 49
11 Heating . 51
12 Charging of metal-ion batteries . 58
13 Leakage current and electric strength at operating temperature . 60
14 Transient overvoltages . 62
15 Moisture resistance . 63
16 Leakage current and electric strength . 66
17 Overload protection of transformers and associated circuits . 68
18 Endurance . 68
19 Abnormal operation . 68
20 Stability and mechanical hazards . 81
21 Mechanical strength . 83
22 Construction . 85
23 Internal wiring . 101
24 Components . 103
25 Supply connection and external flexible cords . 108
26 Terminals for external conductors . 116
27 Provision for earthing . 118
28 Screws and connections . 120
29 Clearances, creepage distances and solid insulation . 122
30 Resistance to heat and fire . 131
31 Resistance to rusting . 135
32 Radiation, toxicity and similar hazards . 135
Annex A (informative) Routine tests . 153
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 155
Annex C (normative) Ageing test on motors . 179
Annex D (normative) Thermal motor protectors . 180
Annex E (normative) Needle-flame test . 181
Annex F (normative) Capacitors . 182
Annex G (normative) Safety isolating transformers . 184
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 187
Annex J (normative) Coated printed circuit boards . 189
Annex K (informative) Overvoltage categories . 190
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 191
Annex M (informative) Pollution degree . 195
Annex N (normative) Proof tracking test . 196
Annex O (informative) Selection and sequence of the tests of Clause 30 . 197
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 202
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 204
Annex R (normative) Software evaluation . 207
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 . 222
Annex T (normative) UV-C radiation effect on non-metallic materials . 223
Annex U (normative) Appliances intended for remote communication through public
networks . 226
Annex AA (normative) Sauna room for testing sauna heating appliances . 231
Annex BB (normative) Estimation of the infrared radiation . 233
Bibliography . 235
Index of defined terms . 238

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 . 137
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 . 138
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 . 139
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 . 140
Figure 5 – Small part . 141
Figure 6 – Example of an electronic circuit with low-power points . 141
Figure 7 – Test finger nail . 142
Figure 8 – Flexing test apparatus . 143
Figure 9 – Constructions of cord anchorages . 144
Figure 10 – An example of parts of an earthing terminal . 145
Figure 11 – Examples of clearances . 146
Figure 12 – Example of the placement of the cylinder . 147
Figure 13 – Small parts cylinder . 148
Figure 14 – Example of a specified operating region of a lithium-ion cell during
charging . 149
Figure 101 – Examples of different types of sauna heating appliances . 150
Figure 102 – Probe for measuring surface temperatures . 151
Figure 103 – Temperature/relative humidity characteristic during normal operation . 151
Figure 104 – Temperature/relative humidity characteristic during abnormal operation . 152
Figure B.1 – Examples of battery-operated appliance constructions and application of
normative Annex B (1 of 2) . 176
Figure B.2 – Examples of correct polarity connection marking representing three
batteries . 178
Figure I.1 – Simulation of faults . 188
Figure L.2 – Sequence for the determination of creepage distances . 193
Figure L.3 – Measurement of clearances . 193
Figure O.1 – Tests for resistance to heat . 197
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 198
Figure O.3 – Selection and sequence of tests for resistance to fire in attended
appliances . 198
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended
appliances . 199
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 201
Figure Q.1 – Flowchart outlining the sequence of tests for the evaluation of electronic
circuits (1 of 2) . 205
Figure R.1 – Examples of software separation . 218
Figure S.1 – Flowchart giving guidance on measurement of power input and current
concerning the representative period . 222
Figure AA.1 – Sauna room . 232
Figure BB.1 – Estimation of maximum irradiance . 234

Table 1 – Power input deviation . 49
Table 2 – Current deviation . 50
Table 3 – Maximum normal temperature rises . 54
Table 101 – Maximum temperature rises for specified external accessible surfaces on
the outside of the sauna room of prefabricated saunas and the outside of the infrared
cabin of prefabricated infrared cabins under normal operating conditions . 58
Table 4 – Voltage for electric strength test . 62
Table 5 – Characteristics of high-voltage sources . 62
Table 6 – Impulse test voltage . 63
Table 7 – Test voltages. 67
Table 102 – Volume of sauna room . 69
Table 8 – Maximum winding temperature . 72
Table 9 – Maximum abnormal temperature rise . 77
Table 20 – Halogen-free cord sets and cords . 106
Table 10 – Dimensions of cables and conduits . 109
Table 11 – Minimum cross-sectional area of conductors . 111
Table 12 – Pull force and torque . 113
Table 13 – Nominal cross-sectional area of conductors . 117
Table 14 – Torque for testing screws and nuts . 121
Table 15 – Rated impulse voltage . 123
Table 16 – Minimum clearances . 124
Table 17 – Minimum creepage distances for basic insulation . 128
Table 18 – Minimum creepage distances for functional insulation . 129
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting
of a single layer . 131
Table A.1 – Test voltages . 154
Table B.1 – Artificial source characteristics . 157
Table B.2 – Total area of openings for metal-ion cells . 166
Table B.3 – Volume of air injected at 2 070 kPa . 166
Table C.1 – Test conditions . 179
Table R.1 – General fault/error conditions . 209
Table R.2 – Specific fault/error conditions . 211
Table R.3 – Semi-formal methods . 217
Table R.4 – Software architecture specification . 217
Table R.8 – Principles of software partitioning . 218
Table R.5 – Module design specification . 219
Table R.6 – Design and coding standards . 219
Table R.7 – Software safety validation . 220
Table T.1 – Minimum property retention limits after UV-C exposure . 224
Table U.1 – Acceptable measures against unauthorised access and transmission
fault/error modes . 228

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household and similar electrical appliances - Safety -
Part 2-53: Particular requirements for sauna
heating appliances and infrared cabins

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
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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
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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 full content
of the Standard.
to IEC 60335-1:2020+AMD1:2025.
The specific content of IEC 60335-2-53:2026 is displayed on a blue background.

IEC 60335-2-53 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2011, Amendment 1:2017
and Amendment 2:2021. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60335-1:2020;
b) conversion of some notes to normative text (Clause 1, 7.1, 7.14, 19.101, 19.104, 22.101,
22.104);
c) clarification and addition of requirements for sauna heaters with a thermal storage function
(Clause 1, 3.1.9, 3.5.101, 3.8.103, 5.3, 7.1, 7.12, 10.1, 10.2, 13.1, 19.1, 19.105);
d) addition of test probe 19 for accessibility of live parts and moving parts not more than
850 mm above the floor (8.1.1, 8.1.3, 20.2);
e) addition of surface temperatures for external accessible surfaces outside the sauna room
or infrared cabin (11.3, 11.8);
f) clarifications related to the use of the terms "control" and "protective device" (3.5.102,
3.6.102, 5.9, 6.2. 7.7, 7.12.1, 22.105, 24.102, Figure 101).
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7626/FDIS 61/7661/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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) with amendment 1
(2025) 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: Safety requirements for sauna heating appliances and
infrared cabins.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan);
– 19.101: Sauna heating appliances provided with a programmable timer are considered to
be appliances that are used by remote operation (Finland).
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.
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.
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.
INTRODUCTION to IEC 60335-1:2020+AMD1:2025 CSV
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website –
www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If the functions of an appliance are covered by different parts 2 of IEC 60335, the relevant part 2
is applied to each function separately, as far as is reasonable. If applicable, the influence of
one function on the other is taken into account.
Throughout this publication, when "part 2" is mentioned, it refers to the relevant part of
IEC 60335.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
Individual countries may wish to consider the application of this standard, as far as is
reasonable, to appliances not mentioned in a part 2, and to appliances designed on new
principles. In this case, consideration should be given to defining normal operation, specifying
the classification of the appliance according to Clause 6 and specifying whether the appliance
is operated attended or unattended. Consideration should also be given to particular categories
of likely users and to related specific risks such as access to live parts, hot surfaces or

hazardous moving parts.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of this standard if, when examined and tested, it is found to
have other features which impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with this
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

INTRODUCTION to IEC 60335-2-53:2026
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.

1 Scope
This part of IEC 60335 deals with the safety of electric sauna heating appliances and infrared
emitting units having a rated power input not exceeding 20 kW, their rated voltage being not
more than 250 V for single-phase appliances and 480 V for other appliances.
The appliances covered by this standard are intended for use in the home and in public saunas
located in blocks of flats, hotels and similar locations.
This standard also applies to prefabricated saunas, prefabricated infrared cabins and sauna
heaters provided with a thermal storage function.
This standard also deals with the safety of electric sauna heating appliances provided with a
humidifier unit. The room air is humidified by evaporating or atomising water.
NOTE 101 A humidifier can be part of a sauna heating appliance or can be incorporated in the sauna heater. The
sauna heating appliance or sauna heater can be operated with or without the humidifier.
As far as is practicable, this standard deals with the common hazards presented by appliances
that are encountered by all persons in and around the home. However, in general, it does not
take into account
– persons (including children) whose
• physical, sensory or mental capabilities; or
• lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
Attention is drawn to the fact that
– for appliances intended to be used in vehicles or on board ships or aircraft, additional
requirements can be necessary;
– in many countries, additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour and similar authorities.
This standard does not apply to
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances intended to cause perspiration to only a part of the human body;
– sweating baths where the head of the user remains outside the heated space;
– tents and other collapsible sauna baths;
– room heaters (IEC 60335-2-30);
– humidifiers intended for use with heating, ventilation, or air-conditioning systems
(IEC 60335-2-88);
– humidifiers (IEC 60335-2-98);
– appliances intended for medical purposes (IEC 60601).
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.
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