EN IEC 60335-2-25:2021

SLOVENSKI STANDARD
01-februar-2022
Nadomešča:
SIST EN 60335-2-25:2012
SIST EN 60335-2-25:2012/A1:2015
SIST EN 60335-2-25:2012/A2:2016
Gospodinjski in podobni električni aparati - Varnost - 2-25. del: Posebne zahteve
za mikrovalovne pečice, vključno s kombiniranimi mikrovalovnimi pečicami
Household and similar electrical appliances - Safety - Part 2-25: Particular requirements
for microwave ovens, including combination microwave ovens
Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke - Teil 2-25:
Besondere Anforderungen für Mikrowellenkochgeräte und kombinierte
Mikrowellenkochgeräte
Appareils électrodomestiques et analogues - Sécurité - Partie 2-25: Règles particulières
pour les fours à micro-ondes, y compris les fours à micro-ondes combinés
Ta slovenski standard je istoveten z: EN IEC 60335-2-25:2021
ICS:
13.120 Varnost na domu Domestic safety
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60335-2-25

NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2021
ICS 13.120; 97.040.20 Supersedes EN 60335-2-25:2012 and all of its
amendments and corrigenda (if any)
English Version
Household and similar electrical appliances - Safety - Part 2-25:
Particular requirements for microwave ovens, including
combination microwave ovens
(IEC 60335-2-25:2020)
Appareils électrodomestiques et analogues - Sécurité - Sicherheit elektrischer Geräte für den Hausgebrauch und
Partie 2-25: Exigences particulières pour les fours à micro- ähnliche Zwecke - Teil 2-25: Besondere Anforderungen für
ondes, y compris les fours à micro-ondes combinés Mikrowellenkochgeräte und kombinierte
(IEC 60335-2-25:2020) Mikrowellenkochgeräte
(IEC 60335-2-25:2020)
This European Standard was approved by CENELEC on 2021-09-27. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60335-2-25:2021 E

European foreword
This document EN IEC 60335-2-25:2021 consists of the text of IEC 60335-2-25:2020 prepared by
IEC/TC 61 "Safety of household and similar electrical appliances".
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-09-27
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-09-27
document have to be withdrawn
This document supersedes EN 60335-2-25:2012 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 60335-2-25:2021/A11:2021.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directives see informative Annex ZZA, which is an integral part of
Endorsement notice
The text of the International Standard IEC 60335-2-25:2020 was approved by CENELEC as a
European Standard.
IEC 60335-2-25 ®
Edition 7.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety–

Part 2-25: Particular requirements for microwave ovens, including combination

microwave ovens
Appareils électrodomestiques et analogues – Sécurité –

Partie 2-25: Exigences particulières pour les fours à micro-ondes, y compris

les fours à micro-ondes combinés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120; 97.040.20 ISBN 978-2-8322-7725-6

– 2 – IEC 60335-2-25:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 10
6 Classification . 10
7 Marking and instructions . 10
8 Protection against access to live parts . 12
9 Starting of motor-operated appliances . 13
10 Power input and current . 13
11 Heating . 13
12 Void . 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 . 15
17 Overload protection of transformers and associated circuits . 16
18 Endurance . 16
19 Abnormal operation . 16
20 Stability and mechanical hazards . 18
21 Mechanical strength . 18
22 Construction . 20
23 Internal wiring . 26
24 Components . 26
25 Supply connection and external flexible cords . 27
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 . 30
Annex A (informative) Routine tests . 30
Annex AA (normative) Combination microwave ovens . 32
Annex BB (normative) Microwave ovens intended to be used on board ships . 34
Bibliography . 36

Figure 101 – Test rod for interlock concealment . 28

IEC 60335-2-25:2020 © IEC 2020 – 3 –
Figure 102 – Test cabinet including working surface, position of funnel and example
for direction of tilt . 28
Figure 103 – Test cabinet including separation board, position of funnel and example
for direction of tilt . 29

– 4 – IEC 60335-2-25:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-25: Particular requirements for microwave ovens,
including combination microwave ovens

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60335-2-25 has been prepared by subcommittee 61B: Safety of
microwave ovens for household and commercial use, of IEC technical committee 61: Safety of
household and similar electrical appliances.
This seventh edition cancels and replaces the sixth edition published in 2010,
Amendment 1:2014 and Amendment 2:2015. This edition constitutes a technical revision.
This edition includes the following significant changes with respect to the sixth edition:
– 11.7 and 19.13 are improved in clarity;
– in 19.102, a note is converted into normative text;
– 19.101 is improved with an alternative measurement method;
– 22.121 is improved with requirements for simultaneous activation of heating elements and
motors;
− 15.2, 15.101, 21, 22.102, 22.112, 22.119, 22.120, 24.101 and 27.1 are improved in clarity;

IEC 60335-2-25:2020 © IEC 2020 – 5 –
– Annex A has editorial improvements and feasible limits of deviations.
The text of this International Standard is based on the following documents:
CDV RVC
61B/611/CDV 61B/626/RVC
61B/615/CDV 61B/627/RVC
61B/621/CDV 61B/628/RVC
61B/622/CDV 61B/629/RVC
61B/623/CDV 61B/630/RVC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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. It was established on the basis of the fifth edition (2010) 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 microwave ovens, including
combination microwave ovens.
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 committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or

– 6 – IEC 60335-2-25:2020 © IEC 2020
• amended.
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.
The following differences exist in the countries indicated below.
– 5.3: Microwave leakage is not to exceed 10 W/m during the initial test (Japan and
USA).
– 6.1: Microwave ovens may be class 0I if the rated voltage does not exceed more
than 150 V (Japan).
– 7.12: Specific instructions exist pertaining to using and servicing microwave ovens
with respect to the risk of exposure to microwave energy (USA).
– 7.12: It is prohibited to place the appliance in a cabinet with a door (Japan).
– Clause 18: The test is carried out on two appliances (USA).
– 19.11.2: The input voltage variation is not applied (USA).
– 19.13: Microwave leakage is measured only at the end of each test (USA).
– 21.102: The applied force is 222 N (USA).
– 21.105: Microwave leakage is not to exceed 50 W/m (Japan and USA).
– 22.111: Microwave leakage is measured only at the end of the test (USA).
– 22.112: Microwave leakage is not to exceed 50 W/m (Japan and USA).
– 22.115: All access to the cavity has to be prevented (USA).

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

IEC 60335-2-25:2020 © IEC 2020 – 7 –
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.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal and generic standards 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 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 the
standard.
– 8 – IEC 60335-2-25:2020 © IEC 2020
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-25: Particular requirements for microwave ovens,
including combination microwave ovens

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of microwave ovens for household and similar
use, their rated voltage being not more than 250 V.
This standard also deals with combination microwave ovens, for which Annex AA is
applicable.
This standard also deals with microwave ovens intended to be used on board ships, for which
Annex BB is applicable.
Appliances not intended for normal household use but which nevertheless may 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. However, if the appliance is
intended to be used professionally to process food for commercial purposes, the appliance is
not considered to be for household and similar use only.
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 101 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.
NOTE 102 This standard does not apply to
– commercial microwave ovens (IEC 60335-2-90);
– industrial microwave heating equipment (IEC 60519-6);
– appliances for medical purposes (IEC 60601);
– 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).

IEC 60335-2-25:2020 © IEC 2020 – 9 –
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-6, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-52, Environmental testing – Part 2-52: Tests – Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60335-2-5:2012, Household and similar electrical appliances – Safety – Part 2-5: Particular
requirements for dishwashers
IEC 60335-2-6:2014, Household and similar electrical appliances – Safety – Part 2-6: Particular
requirements for stationary cooking ranges, hobs, ovens and similar appliances
IEC 60335-2-9, Household and similar electrical appliances – Safety – Part 2-9: Particular
requirements for grills, toasters and similar portable cooking appliances
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.7 Addition:
NOTE 101 The rated frequency is the input frequency.
3.1.9 Replacement:
normal operation
operation of the appliance with 1 000 g ± 50 g of potable water at an initial temperature of
20 °C ± 2 °C in a cylindrical borosilicate glass vessel having a maximum thickness of 3 mm and
an outside diameter of approximately 190 mm. The vessel is placed on the centre of the shelf
3.101
microwave oven
appliance using electromagnetic energy in one or several of the ISM frequency bands between
300 MHz and 30 GHz, for heating food and beverages in a cavity
3.102
combination microwave oven
microwave oven in which heat is also provided in the cavity by simultaneous or consecutive
operation of resistive heating elements
Note 1 to entry: The resistive heating elements are used to provide radiant heat, convection heat or steam.
3.103
cavity
space enclosed by the inner walls and the door in which the load is placed
___________
ISM frequency bands are the electromagnetic frequencies established by the ITU and reproduced in CISPR 11.

– 10 – IEC 60335-2-25:2020 © IEC 2020
3.104
shelf
horizontal support in the cavity on which the load is placed
3.105
door interlock
device or system that prevents the operation of the magnetron, unless the oven door is closed
3.106
monitored door interlock
door interlock system that incorporates a supervision device
3.107
temperature-sensing probe
device that is inserted into the food to measure its temperature and is a part of an oven control
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:
NOTE 101 An additional sample can be required for the test of 19.104.
NOTE 102 Six samples of the interlocks are required for the test of 24.1.4.
5.3 Modification:
Instead of carrying out the tests in the order of clauses, the following sequence of clauses and
subclauses applies: Clause 32, 22.113, 22.108, 22.115, 22.116, Clause 7 to 17, Clause 20,
Clause 21 (except 21.101 to 21.105), Clause 18, Clause 19 (except 19.104), Clause 22 (except
22.108, 22.113, 22.115 and 22.116), Clause 23 to 31, 21.101 to 21.105 and 19.104.
5.101 Microwave ovens are tested as motor-operated appliances.
5.102 Class III temperature-sensing probes are only subjected to the tests of 22.112.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Microwave ovens shall be class I or class II.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
IEC 60335-2-25:2020 © IEC 2020 – 11 –
Appliances shall be marked with the nominal frequency in megahertz of the ISM band in which
they operate.
If the removal of any cover results in microwave leakage exceeding the value specified in
Clause 32, the cover shall be marked with the substance of the following:
WARNING
MICROWAVE ENERGY
DO NOT REMOVE THIS COVER
If an appliance incorporates a socket-outlet protected by means of fuses, other than D-type
fuses, it shall be marked with the rated current of the relevant fuse. When a miniature fuse-link
is provided, this marking shall indicate that the fuse-link is to have a high breaking capacity.
7.12 Addition:
The instructions shall state the substance of the following:
IMPORTANT SAFETY INSTRUCTIONS
READ CAREFULLY AND KEEP FOR FUTURE REFERENCE
The instructions shall include the substance of the following warnings:
– WARNING: If the door or door seals are damaged, the oven must not be operated until it
has been repaired by a competent person.
– WARNING: It is hazardous for anyone other than a competent person to carry out any
service or repair operation that involves the removal of a cover which gives protection
against exposure to microwave energy.
– WARNING: Liquids and other foods must not be heated in sealed containers since they are
liable to explode.
The instructions shall include the substance of the following:
– This appliance is intended to be used in household and similar applications such as:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• by clients in hotels, motels and other residential environments;
• bed and breakfast type environments.
If the manufacturer wishes to limit the use of the appliance to less than the above, this has
to be clearly stated in the instructions.
– The minimum height of free space necessary above the top surface of the oven.
– Only use utensils that are suitable for use in microwave ovens.
– Metallic containers for food and beverages are not allowed during microwave cooking. This
requirement is not applicable if the manufacturer specifies size and shape of metallic
containers suitable for microwave cooking.
– When heating food in plastic or paper containers, keep an eye on the oven due to the
possibility of ignition.
– The microwave oven is intended for heating food and beverages. Drying of food or clothing
and heating of warming pads, slippers, sponges, damp cloth and similar may lead to risk of
injury, ignition or fire.
– If smoke is observed, switch off or unplug the appliance and keep the door closed in order
to stifle any flames.
– Microwave heating of beverages can result in delayed eruptive boiling, therefore care must
be taken when handling the container.

– 12 – IEC 60335-2-25:2020 © IEC 2020
– The contents of feeding bottles and baby food jars shall be stirred or shaken and the
temperature checked before consumption, in order to avoid burns.
– Eggs in their shell and whole hard-boiled eggs should not be heated in microwave ovens
since they may explode, even after microwave heating has ended.
– Details for cleaning door seals, cavities and adjacent parts.
– The oven should be cleaned regularly and any food deposits removed.
– Failure to maintain the oven in a clean condition could lead to deterioration of the surface
that could adversely affect the life of the appliance and possibly result in a hazardous
situation.
– Only use the temperature probe recommended for this oven (for appliances having a facility
to use a temperature-sensing probe).
– The instructions for use for fixed appliances and built-in appliances being used equal or
higher than 900 mm above the floor and having detachable turntables shall state that care
should be taken not to displace the turntable when removing containers from the appliance.
This is not applicable for appliances with horizontal bottom hinged door.
– The appliance shall not be cleaned with a steam cleaner.
The manufacturer shall state in the instructions whether the microwave oven is intended to be
used freestanding, built-in or in a cabinet. If the appliance can be used while placed in a cabinet,
• the minimum dimensions of the cabinet shall be given by the manufacturer, and
• the instructions shall state that the appliance must be operated with any cabinet door open.
The instructions for microwave ovens having an additional decorative door shall state that the
appliance must be operated with the decorative door open.
The instructions for microwave ovens that are not tested in a cabinet shall state that the
appliance must not be placed in a cabinet.
The instructions for microwave ovens that are not in compliance with 22.118 shall state that
the appliance must not be installed equal or higher than 900 mm above the floor.
7.14 Addition:
The height of the lettering of the warning specified in 7.1 shall be at least 3 mm.
Compliance is checked by measurement.
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
Test probe 18 of IEC 61032 is also applied, as specified for test probe B. However, it is only
applied to parts that are accessible when the oven is operated in normal use.
8.2 Addition:
IEC 60335-2-25:2020 © IEC 2020 – 13 –
Test probe 18 of IEC 61032 is also applied, as specified for test probe B. However, it is only
applied to parts that are accessible when the oven is operated in normal use.
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:
Appliances, other than built-in appliances, are positioned as specified for heating appliances.
A ceiling is placed over the appliance at the minimum height stated in the instructions.
The ceiling has a depth of 300 mm from the back wall of the test corner and a length at least
150 mm in excess of the width of the appliance.
Appliances that can be used when placed in a cabinet are placed in a cabinet with the minimum
dimension given in the instructions by the manufacturer, the plywood specified for the test
corner being used. The appliance is positioned against the rear wall and one of the side walls.
The cabinet door is in the open position.
11.7 Replacement:
Appliances are operated for three cycles, each cycle consisting of a heating period of 10 min
followed by a rest period of 1 min. The last cycle does not include a rest period of 1 min. During
the rest periods, the door is open and the load is replaced.
11.8 Addition:
The temperature rises of external surfaces of microwave ovens are only measured on the
surfaces that are not placed against the wall and the floor of the test corner.
There are no temperature rise limits for air-outlet grilles and for surfaces up to a distance of
25 mm from them.
NOTE 101 These surfaces do not include handles.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable.
14 Transient overvoltages
This clause of Part 1 is applicable.

– 14 – IEC 60335-2-25:2020 © IEC 2020
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:
A quantity of 0,5 l of the same spillage solution is poured steadily over the shelf over a period
of 1 min. If the shelf can collect spilled liquid, it is filled with the solution and a further 0,5 l is
then added over a period of 1 min.
15.101 Temperature-sensing probes shall be constructed so that their insulation is not
affected by water.
Compliance is checked by the following test.
The probe is completely immersed in water containing approximately 1 % NaCl and having a
temperature of 20 °C ± 5 °C. The solution is heated to the boiling point in approximately 15 min.
The probe is then removed from the boiling solution and immersed in the solution having a
temperature of 20 °C ± 5 °C for 30 min.
This procedure is carried out five times, after which the probe is removed from the solution. All
traces of liquid are then removed from the surface.
The probe shall then withstand the leakage current test of 16.2.
NOTE Detachable temperature-sensing probes are not connected to the appliance for this test. Non-detachable
temperature-sensing probes are tested in the cavity, the probe being immersed as much as possible.
15.102 Microwave ovens intended to be built-in as underbench installation and therefore
subject to spillage of liquid from containers onto working surfaces shall be constructed so that
such spillage does not affect their electrical insulation.
Compliance is checked by the following test (see Figure 102).
The microwave oven is built-in as underbench installation as specified by the manufacturer.
The test cabinet including the working surface is tilted to an angle of 2° in the most unfavourable
direction. 500 ml of water containing approximately 1 % NaCl and approximately 0,6 % acid
rinsing agent is poured steadily over a period of 20 s through a funnel onto the complete width
of the working surface above the microwave oven. The funnel has an outlet diameter of
approximately 8 mm and the lower edge of its outlet is positioned 20 mm above the working
surface. The centre of the funnel is positioned 15 mm inwards from the leading edge of the
working surface.
The leading edge of the working surface shall be rounded with a radius of 25 mm and the
working surface shall be 50 mm in thickness and free of any drain slots, drain edges, tearing
edges and similar.
Immediately after the test, the appliance shall withstand the electric strength test of 16.3 and
inspection shall show that there is no trace of water on insulation that could result in a reduction
of clearances or creepage distances below the values specified in Clause 29.
The composition of the water containing approximately 1 % NaCl and approximately 0,6 % acid
rinsing agent is described in Annex AA of IEC 60335-2-5:2012.
15.103 Microwave ovens intended to be built-in in cabinets underneath other built-in
appliances and therefore subject to spillage of liquid from filled containers which are handled
during usage of these other appliances shall be constructed so that such spillage does not
affect their electrical insulation.

IEC 60335-2-25:2020 © IEC 2020 – 15 –
Compliance is checked by the following test (see Figure 103).
The microwave oven is built-in as specified by the manufacturer. The test cabinet is tilted to
an angle of 2° in the most unfavourable direction. 200 ml of water containing approximately 1 %
NaCl and approximately 0,6 % acid rinsing agent is poured steadily over a period of 8 s through
a funnel onto the complete width of the separation board above the microwave oven. The
funnel has an outlet diameter of approximately 8 mm and the lower edge of its outlet is
positioned 20 mm above the separation board. The centre of the funnel is positioned 15 mm
inwards from the leading edge of the separation board.
If the manufacturer states in the installation instructions that a separation board above the
microwave oven is not required, the test shall be repeated while pouring the water containing
approximately 1 % NaCl and approximately 0,6 % acid rinsing agent directly onto the complete
width of the top surface of the microwave oven. The lower edge of the funnel outlet is
positioned 20 mm above the top surface of the microwave oven and its centre is positioned
15 mm inwards from the leading edge of the microwave oven.
Immediately after the test, the appliance shall withstand the electric strength test of 16.3 and
inspection shall show that there is no trace of water on insulation that could result in a reduction
of clearances or creepage distances below the values specified in Clause 29.
The composition of the water containing approximately 1 % NaCl and approximately 0,6 % acid
rinsing agent is described in Annex AA of IEC 60335-2-5:2012.
16 Leakage current and electric strength
This clause of Part 1 is applicable except as follows.
16.101 The windings of the power transformer that supplies the magnetron shall have
adequate insulation.
Compliance is checked by the test of 16.101.1 for switch-mode power supplies and by the test
of 16.101.2 for other power transformers.
16.101.1 The insulation between the primary and secondary windings of switch-mode power
supply transformers is subjected for 1 min to a voltage of substantially sinusoidal waveform and
having a frequency of 50 Hz or 60 Hz. The value of the voltage is 1,414 times the peak value
of the secondary working voltage plus 750 V, with a minimum of 1 250 V.
There shall be no breakdown between windings or between adjacent turns of the same winding.
16.101.2 Twice the working voltage is induced in the secondary winding of the transformer
by applying a sinusoidal voltage having a frequency higher than rated frequency to the primary
terminals.
The duration of the test is
– 60 s, for frequencies up to twice the rated frequency, or
rated frequency
– 120 × s, with a minimum of 15 s, for higher frequencies.
test frequency
NOTE The frequency of the test voltage is higher than the rated frequency to avoid excessive excitation current.
A maximum of one-third of the test voltage is applied and is then rapidly increased without
creating transients. At the end of the test, the voltage is decreased in a similar manner to
approximately one-third of its full value before switching off.

– 16 – IEC 60335-2-25:2020 © IEC 2020
There shall be no breakdown between windings or between adjacent turns of the same winding.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable except as follows.
Addition:
The tests are not carried out on the power transformer that supplies the magnetron and its
associated circuits, these being checked during the tests of Clause 19.
18 Endurance
This clause of Part 1 is replaced by the following.
The door system, including hinges, microwave seals and other associated parts, shall be
constructed to withstand wear that may be expected in normal use.
Compliance is checked by the following test.
The door system is subjected to 50 000 cycles of operation with the appliance supplied at rated
voltage and contain
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