IEC 60335-2-110:2013

IEC 60335-2-110 ®
Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-110: Particular requirements for commercial microwave appliances with
insertion or contacting applicators

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-110: Exigences particulières pour les appareils à micro-ondes à usage
commercial avec applicateurs par insertion ou par contact

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les
microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: csc@iec.ch.

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: csc@iec.ch.
IEC 60335-2-110 ®
Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-110: Particular requirements for commercial microwave appliances with

insertion or contacting applicators

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-110: Exigences particulières pour les appareils à micro-ondes à usage

commercial avec applicateurs par insertion ou par contact

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 97.040.20 ISBN 978-2-8322-1084-0

– 2 – 60335-2-110 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 General requirement . 12
5 General conditions for the tests . 12
6 Classification . 12
7 Marking and instructions . 12
8 Protection against access to live parts . 16
9 Starting of motor-operated appliances . 16
10 Power input and current. 17
11 Heating. 17
12 Void . 17
13 Leakage current and electric strength at operating temperature . 17
14 Transient overvoltages . 17
15 Moisture resistance . 17
16 Leakage current and electric strength . 17
17 Overload protection of transformers and associated circuits . 18
18 Endurance . 18
19 Abnormal operation . 19
20 Stability and mechanical hazards. 20
21 Mechanical strength . 20
22 Construction . 22
23 Internal wiring . 25
24 Components . 25
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 . 28
32 Radiation, toxicity and similar hazards . 28
101 Protection against accessibility to microwave-containing regions . 29
Annex AA (informative) Rationales for the microwave barrier and associated leakage
tests . 38
Bibliography . 43

Figure 101 – Test rod for interlock concealment . 31
Figure 102 – Arrangement for measurement of microwave leakage . 32
Figure 103 – Construction site, overview of different applicator types and their use . 33

60335-2-110 © IEC:2013 – 3 –
Figure 104 – Large area contacting applicator without traction drive . 34
Figure 105 – Large area contacting applicator with traction drive . 35
Figure 106 – Insertion applicator . 36
Figure 107 – Small area contacting applicator . 37

Table 101 – Specifications for microwave barriers . 30

– 4 – 60335-2-110 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-110: Particular requirements for commercial
microwave appliances with insertion or contacting applicators

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.
This part of International Standard IEC 60335 has been prepared by subcommittee SC61B:
Safety of microwave appliances for household and commercial use, of IEC technical
committee 61: Safety of household and similar electrical appliances.
The text of this standard is based on the following documents:
FDIS Report on voting
61B/477/FDIS 61B/483/RVD
Full information on the voting for the approval of this 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.

60335-2-110 © IEC:2013 – 5 –
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: Safety requirements for commercial microwave
appliances with insertion or contacting applicators.
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 publication 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
• 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.
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.

– 6 – 60335-2-110 © IEC:2013
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.
60335-2-110 © IEC:2013 – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-110: Particular requirements for commercial
microwave appliances with insertion or contacting applicators

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of microwave appliances intended for
commercial use, their rated voltage being not more than 250 V for single-phase appliances
connected between one phase and neutral and 480 V for other appliances.
In general, this standard 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.
Appliances covered by this standard incorporate an open-ended applicator (as example an
overview is given in Figure 103) for treatment of the load. They are divided into three types:
– with insertion applicator, typically for moisture removal by insertion into holes in floors,
walls or ceilings (an example is given in Figure 106);
– with large area contacting applicator, typically for drying of floors, walls or ceilings
(examples are given in Figure 104 and Figure 105);
– with small area contacting applicator, typically for paint removal and spot-heating (an
example is given in Figure 107).
NOTE 101 Appliances with insertion applicator and with large area contacting applicator are portable
appliances. Appliances with small area contacting applicator are handheld appliances.
NOTE 102 Appliances that use non-electrical energy are within the scope of this standard. The microwave-related
portion is considered motor-operated.
NOTE 103 Attention is drawn to the fact that
– these appliances can radiate microwave energy outside a restricted area where they are used. The additional
requirements specified by national authorities responsible for the protection for non-ionising radiation that the
limit of power flux density is 10 W/m , averaged over any time period of 6 min, outside this restricted area is
taken into consideration in this standard;
– these appliances are intended to exclusively treat the load in normal operation, i.e. this standard does not
apply to appliances or systems employing free space microwave propagation;
– for appliances intended to be used in tropical countries, special requirements can be necessary;
– in many countries, additional requirements are specified by the national health authorities, and national
authorities responsible for the protection of labour and for non-ionising radiation protection.
NOTE 104 This standard does not apply to
– household microwave ovens, including combination microwave ovens (IEC 60335-2-25);
– commercial microwave ovens with a cavity door, commercial combination microwave ovens with a cavity door
and commercial microwave ovens without a cavity door and with transportation means (IEC 60335-2-90);
– industrial microwave heating equipment (IEC 60519-6);
– appliances for medical purposes (IEC 60601-1);

– 8 – 60335-2-110 © IEC:2013
– appliances and equipment for laboratory use (series of IEC 61010);
– 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).
NOTE 105 Some of the specifications and tests in this standard are not applicable for other than 2 450 MHz
appliances.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60335-2-90, Household and similar electrical appliances – Safety – Part 2-90: Particular
requirements for commercial microwave ovens
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.7 Addition:
Note 101 to entry: The rated frequency is the input frequency.
3.1.9 Replacement:
normal operation
heating operation of the appliance under the following conditions:
The appliance is operated according to the manufacturer’s instructions for intended use.
However, using a typical load for intended use may be impractical, since it may be part of a
building, unless the manufacturer makes useful and realistic such loads available for the
tests. If that is not the case, the appliance is operated under the following conditions:
The initial temperature of the test load which is used for microwave energy absorption shall
be (20 ± 5) °C.
The highest generator power settings are to be used.
Appliances with an insertion applicator for moisture removal are operated by insertion into
holes in floor, wall or ceiling structures under the following conditions:
a) The test load consists of a metal tank filled with water, having an open top water surface
exceeding that of the horizontal dimensions of the appliance by at least 70 mm on all
sides and having a water column height of at least 150 mm plus the length of the longest
insertion distance of the insertion applicator. At the top sides of the tank there are
horizontal supports of a microwave-transparent material, with a suitable opening for the
applicator antenna. The water level is adjusted so that the distance from the housing of
the appliance to the test load is the same as in its intended use.
Note 101 to entry: If it is obvious that good microwave impedance matching of the insertion applicator can be
obtained only if the hole into which it is inserted is not water-filled, a sleeve or similar of a highly microwave
transparent material such as PTFE is used around the insertion applicator. If wave propagation in the axial
direction occurs in the test set-up and the manufacturer can show that it is not possible in actual use, or monitoring
devices then shut down the insertion applicator, a thin-wall plastic tube with inner diameter corresponding to the
maximum hole diameter according to the manufacturer’s specification can be used.
b) Appliances with large area contacting applicator for drying of floor, wall or ceiling
structures are operated under the following conditions: the test load consists of a metal
tank filled with water, having an open top water surface exceeding that of the horizontal
dimensions of the appliance by at least 70 mm on all sides and having a water column
height of at least 150 mm. At the top of two opposite tank sides there are horizontal
supports of a microwave-transparent material, extending just so far inwards that the

60335-2-110 © IEC:2013 – 9 –
traction drive rests on the support. The water level is adjusted so that the distance from
the applicator to the test load is the same as in its intended use.
The proper reversal function of the traction drive is tested under the following conditions:
the appliance is operated on a horizontal plywood surface with a thickness of 20 mm and
an area sufficient to allow back and forth movement between blocks representing walls.
Note 102 to entry: If needed for representative operation of the appliance, the horizontal supports are extended
as to activate the mechanical microwave interlocks.
Appliances with small area contacting applicator for paint removal and spot-heating are
operated under the following conditions:
The test load consists of a grinding wheel or grinding block made of fine-grained silicon
carbide at least 15 mm in thickness, and its length and width exceeding the corresponding
dimensions of the applicator opening by at least 30 mm; however this test load shall be so
large that it can be air-cooled from the underside without the appliance being influenced.
3.101
microwave appliance with insertion, large or small area contacting applicator
commercial appliance using electromagnetic energy in one or several of the ISM frequency
bands between 300 MHz and 30 GHz, for supplying energy to an external load which is
heated so that a resulting process of drying, moisture transport which may result in forces due
to formation of steam, decomposition or chemical modification, melting, or termination of
organisms such as bacteria or fungus occurs
Note 1 to entry: ISM frequency bands are the electromagnetic frequencies established by the ITU and reproduced
in CISPR 11.
Note 2 to entry: Food and beverages are not loads in the meaning of this standard.
3.102
applicator
structure which applies the microwave energy to the load
3.103
load
object to be treated into which the applicator is introduced or put in close position to
3.104
microwave transparency
property of a material having negligible absorption and reflection of microwaves
Note 1 to entry: The relative permittivity of a microwave transparent material is less than 7 and the relative loss
factor is less than 0,015.
3.105
insertion applicator
applicator for insertion into the load, in which all available microwave power is intended to
be absorbed
3.106
large area contacting applicator
applicator with a metallic enclosure, having at least one geometric non-metallic opening
through which microwave energy is applied to a closely located external load in which all
available microwave power is intended to be absorbed
3.107
small area contacting applicator
applicator with a metallic enclosure, having at least one geometric non-metallic opening or
appropriate device through which microwave energy is applied to a very closely located
external load in which all rated microwave power is intended to be absorbed

– 10 – 60335-2-110 © IEC:2013
3.108
rated microwave power output
microwave power output assigned to the appliance by the manufacturer
Note 1 to entry: This can be lower than the available microwave power, due to intentional microwave power
losses in microwave absorbers (see Note in 101.1) and coaxial cables acting for protection of the microwave
generator of small area contacting applicators (see 22.101).
3.109
available microwave power
the microwave generator nominal output under impedance matched condition which is
obtained by the generator manufacturer specification and measurement of its electrical input
to the generator in the appliance during the first 10 s of operation at maximum power
Note 1 to entry: Magnetrons will typically have a stationary power output 3 s after energising.
3.110
instructed person
person who is sufficiently instructed and monitored to know how to avoid any danger caused
by the operation of a microwave appliance with insertion applicator, large area contacting
applicator, or small area contacting applicator
3.111
skilled person
person with suitable professional education, knowledge and experience to discern and to
avoid any danger caused by the operation of a microwave appliance with insertion
applicator, large area contacting applicator, or small area contacting applicator
3.112
ordinary person
person who is neither a skilled person nor an instructed person
3.113
traction drive
means or system used to accomplish movement of an appliance with large area contacting
applicator on a floor
3.114
microwave enclosure
overall structure that is intended to confine the microwave energy
Note 1 to entry: Barriers mounted outside the microwave enclosure are not considered a part of it.
3.115
microwave barrier
microwave transparent part of the microwave appliance that is mounted outside the
microwave enclosure for limiting access into it and can only be removed with the aid of
tools
Note 1 to entry: A microwave barrier can be mounted between the microwave enclosure and the external cover
of the appliance.
Note 2 to entry: Devices such as an array of metal chains or hinged metal plates at the periphery of the opening
of an applicator intended to reduce microwave leakage are not considered microwave barriers.
Note 3 to entry: Microwave barriers cannot be hinged or flexed.

60335-2-110 © IEC:2013 – 11 –
3.116
microwave guard
constructive part of the appliance that is mounted outside or at the microwave enclosure for
reducing microwave leakage by shielding and/or absorption and can only be removed with the
aid of tools
Note 1 to entry: Microwave guards can move or open when the applicator is brought into contact with the load.
Note 2 to entry: Devices such as an array of metal chains or hinged metal plates at the periphery of the opening
of an applicator intended to reduce microwave leakage are considered microwave guards.
3.117
maintenance door
constructive part of the appliance that can be opened or removed with the aid of tools to get
access for service and repair
3.118
microwave interlock
device or system that prevents the operation of the microwave generator if conditions of
excessive microwave leakage occur or are likely to occur
Note 1 to entry: Examples of microwave interlock are switches which stop the microwave power when a
contacting applicator is lifted up or an insertion applicator is removed from its load during operation, and an
integral leakage monitor which does the same if there is insufficient proximity between an applicator and the load
or if an attempt is made to start the appliance without a load.
3.119
intended use
any use of the appliance which is reasonably foreseeable, as described in the user
instructions, and which is consistent with such activities as operating, starting, stopping,
connecting to or disconnecting from the supply mains
3.120
control
any control device requiring the operator’s actuation to perform specific functions
3.121
viewing opening
opening into the applicator through which the treatment can be visually monitored
3.122
restricted area
the space where the operation of the equipment takes place, plus any area outside this where
the exposure level from the equipment may exceed 10 W/m , averaged over any 6 min
Note 1 to entry: The restricted area is determined by measuring the microwave leakage through floor, wall or
ceiling structures of the treatment zone. The thickness of the load in the radially outgoing direction from the
applicator is considered only if the load is accessible from behind for microwave leakage measurements in
normal operation.
3.123
biased-off switch
switch that automatically returns to the off-position when its actuating member is released
3.124
start switch
biased-off switch that shall be actuated by the operator before the operation switch will
function
– 12 – 60335-2-110 © IEC:2013
3.125
operation switch
biased-off switch designed so that it will automatically disconnect the microwave generator
or the supply main circuit when the operator’s actuating force is removed
4 General requirement
This clause of Part 1 is applicable except as follows.
4.101 Instead of the requirements on supervision of the microwave interlocks by monitored
microwave interlocks as in IEC 60335-2-90, this standard applies the concepts of restricted
area and microwave leakage checks of microwave interlock function for large area
contacting applicators and insertion applicators – and start switch as well as operation
switch for small area contacting applicators.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.3 Modification:
Instead of carrying out the tests in the order of clauses, the following sequence of clauses
and subclauses applies: 32, 22.107, 101, 7 to 17, 20, 21, 18, 19, 22 (except 22.107), 23 to 31.
NOTE 101 Clause 101 deals with the protection against leakage by basic design of microwave enclosures;
Clause 22 deals with the additional requirements applicable when handling and against improper handling of the
appliance, and against other hazards caused by the microwaves; Clause 32 deals with the leakage measurement
instrumentation and handling, plus limiting values.
5.101 Addition:
The microwave-related portion of the appliance is considered motor-operated.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Microwave appliances shall be class I.
6.2 Addition:
Large area contacting applicators and insertion applicators shall be at least IPX1. Small
area contacting applicators shall be at least IPX5.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the nominal frequency in megahertz of the ISM band in which
they operate.
60335-2-110 © IEC:2013 – 13 –
Appliances shall be marked with the rated microwave power output.
Appliances shall be marked on an affixed inspection tag or similar, with the date when the
latest complying microwave leakage and function test in accordance with the service manual
was carried out.
Compliance is checked by inspection.
7.12 Addition:
The instructions shall include the substance of the following.
– WARNING: If microwave barriers or microwave guards are damaged, the appliance
must not be operated until repairs by a skilled person have been carried out;
– WARNING: It is hazardous for anyone other than a skilled person to carry out any service
or repair operation that involves the removal of any cover or barrier which gives protection
against exposure to microwave energy;
– if smoke is observed, switch off or unplug the appliance;
– failure to maintain the appliance in a clean condition could lead to deterioration that could
adversely affect the life of the appliance and possibly result in a hazardous situation;
– the appliance shall not be cleaned with a water jet.
The substance of the following warnings, if applicable, shall be placed in a prominent position
on the appliance. The letters, which may be in upper or lower case, shall be a minimum of
3 mm high, in black on a yellow background. Where appropriate IEC/ISO symbols or
pictograms are available, they may be used. Markings or symbols giving cautionary
information shall be located close to the hazard.
– WARNING: Switch off and remove plug from mains before adjusting, cleaning or if the
cord is entangled or damaged.
– WARNING: Read the instruction sheet.
– WARNING: Keep the flexible supply cord away from the microwave-energised parts.
A microwave warning sign (IEC 60417-5140 (2003-04)) of a size specified in IEC 60417, shall
be placed in a location where any microwave barrier or microwave guard is visible, or near
the opening in the microwave barrier of a contacting applicator under which there is a
load.
The warning text shall include the substance of the following:
WARNING
MICROWAVE ENERGY
DO NOT INSERT THE HAND OR FOREIGN OBJECTS
The same type of warning sign shall be placed at viewing openings with holes larger than
diameter 12 mm and which are not protected by visually transparent protective devices. A
warning not to insert objects shall also be given.
Appliances shall be operated only by instructed persons or skilled persons.

– 14 – 60335-2-110 © IEC:2013
An instruction sheet shall be supplied with the appliance.
The instructions shall include:
a) those warnings required to be marked on the appliance together with further explanation,
where appropriate;
b) specifications of the load surface irregularities (non-flatness) with which the appliance
may be used;
c) that the appliance shall not be used in standing water;
d) advice on the use and type of extension cords to be used (not lighter than required in
25.7);
e) instructions for fitting and use of attachments, if any;
f) the substance of the following, where appropriate:
WARNING: If parts of viewing openings, microwave barriers, microwave guards, the
housing or any other means named by the manufacturer are damaged, the appliance shall
not be operated until it is repaired by a skilled person. Until repairs are carried out, the
appliance shall be set in a permanent non-operational condition (e.g. with key switch,
code-card or similar devices). Further details are included in the instructions for use.
The instructed persons shall regularly, but at a minimum of once a year, be instructed by a
skilled person. A record of the instruction provided shall be required.
1) Training
• Read the instructions carefully. Be familiar with the controls and the proper use of the
appliance.
• Never allow people unfamiliar with these instructions to use the appliance.
2) Preparation
• Thoroughly inspect the area where the appliance is to be used and remove all foreign
objects.
3) Operation
• Operate the appliance only in daylight or in good artificial light.
• The main switch key shall not be left with the appliance when it is unattended.
• The key shall be stored in a safe place.
• Use extreme caution when reversing or pulling an operating insertion applicator or
large area contacting applicator towards you.
• Overheating of potentially flammable loads such as wood and some composite
materials may be locally and internally heated to charring, which may in turn cause the
microwave absorption rate to increase so that a fire occurs. The microwave power
setting may need to be reduced and the treatment shall be constantly attended.
Attention shall also be paid to the risk of a delayed hazardous condition.
• If smoke is observed, switch off the appliance, contain the fire by an extinguisher, pay
attention to the risk of recurrence and see to it that the overheated region does not
expand to unattended spaces.
• Never operate the appliance with defective microwave barriers or microwave
guards, or without other safety devices in place.
• Switch on the appliance according to instructions and with all parts of your body which
are not used for correct handling of the appliance well away from the applicator.
• Do not put hands or feet near or under applicators, microwave barriers or microwave
guards.
60335-2-110 © IEC:2013 – 15 –
• Pull the plug from the socket:
– before clearing a blockage;
– before checking, cleaning or working on the appliance;
– after striking a foreign object. Inspect the appliance and if damaged do not operate
it until it has been repaired by a skilled person.
7.14 Addition:
The warning specified in 7.12 shall be in lettering at least 3 mm high.
The warning specified in 7.101 and 7.102 shall be in lettering at least 5 mm high.
7.101 The service or repair manual shall include the substance of the following:
– WARNING: The appliance shall comply with requirements of Clauses 101 and 32 after
every repair and according to the instructions of the manufacturer.
Attention: Persons shall not be exposed to excessive emitted microwave energy from the
microwave generator. All connections, waveguides, flanges, seals, contacts, etc. of the
applicator, microwave enclosure, microwave barriers and microwave guards shall be
safely constructed so that the microwave leakage does not exceed the allowed limit.
Operation of the appliance without a microwave absorbing load shall be avoided. The
appliance shall be regularly maintained and kept in a good condition to ensure that microwave
leakage does not exceed the allowed limit.
In addition, the service manual shall specify the following:
– the pre
...

IEC 60335-2-110 ®
Edition 1.1 2019-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-110: Particular requirements for commercial microwave appliances with
insertion or contacting applicators

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-110: Exigences particulières pour les appareils à micro-ondes à usage
commercial avec applicateurs par insertion ou par contact

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire

Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60335-2-110 ®
Edition 1.1 2019-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-110: Particular requirements for commercial microwave appliances with
insertion or contacting applicators
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-110: Exigences particulières pour les appareils à micro-ondes à usage
commercial avec applicateurs par insertion ou par contact
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20 ISBN 978-2-8322-5431-8

IEC 60335-2-110 ®
Edition 1.1 2019-10
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-110: Particular requirements for commercial microwave appliances with
insertion or contacting applicators

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-110: Exigences particulières pour les appareils à micro-ondes à usage
commercial avec applicateurs par insertion ou par contact

– 2 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 13
5 General conditions for the tests . 13
6 Classification . 13
7 Marking and instructions . 13
8 Protection against access to live parts . 18
9 Starting of motor-operated appliances . 18
10 Power input and current. 19
11 Heating. 19
12 Void . 19
13 Leakage current and electric strength at operating temperature . 19
14 Transient overvoltages . 19
15 Moisture resistance . 19
16 Leakage current and electric strength . 20
17 Overload protection of transformers and associated circuits . 20
18 Endurance . 20
19 Abnormal operation . 21
20 Stability and mechanical hazards. 22
21 Mechanical strength . 22
22 Construction . 24
23 Internal wiring . 27
24 Components . 27
25 Supply connection and external flexible cords . 28
26 Terminals for external conductors . 29
27 Provision for earthing . 29
28 Screws and connections . 29
29 Clearances, creepage distances and solid insulation . 29
30 Resistance to heat and fire . 29
31 Resistance to rusting . 29
32 Radiation, toxicity and similar hazards . 29
101 Protection against accessibility to microwave-containing regions . 31
Annex AA (informative) Rationales for the microwave barrier and associated leakage
tests . 40
Bibliography . 45

Figure 101 – Test rod for interlock concealment . 33
Figure 102 – Arrangement for measurement of microwave leakage . 34

© IEC 2019
Figure 103 – Construction site, overview of different applicator types and their use . 35
Figure 104 – Large area contacting applicator without traction drive . 36
Figure 105 – Large area contacting applicator with traction drive . 37
Figure 106 – Insertion applicator . 38
Figure 107 – Small area contacting applicator . 39

Table 101 – Specifications for microwave barriers . 32

– 4 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-110: Particular requirements for commercial
microwave appliances with insertion or contacting applicators

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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60335-2-110 edition 1.1 contains the first edition (2013-09) [documents
61B/477/FDIS and 61B/483/RVD] and its amendment 1 (2019-10) [documents
61B/613/CDV and 61B/637/RVC as well as 61B/614/CDV and 61B/638/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2019
This part of International Standard IEC 60335 has been prepared by subcommittee SC61B:
Safety of microwave appliances for household and commercial use, of IEC technical
committee 61: Safety of household and similar electrical appliances.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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: Safety requirements for commercial microwave
appliances with insertion or contacting applicators.
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.
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.

– 6 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
The committee has decided that the contents of the base publication and its amendment 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
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
© IEC 2019
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 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-110: Particular requirements for commercial
microwave appliances with insertion or contacting applicators

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of microwave appliances intended for
commercial use, their rated voltage being not more than 250 V for single-phase appliances
connected between one phase and neutral and 480 V for other appliances.
In general, this standard 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.
Appliances covered by this standard incorporate an open-ended applicator (as example an
overview is given in Figure 103) for treatment of the load. They are divided into three types:
– with insertion applicator, typically for moisture removal by insertion into holes in floors,
walls or ceilings (an example is given in Figure 106);
– with large area contacting applicator, typically for drying of floors, walls or ceilings
(examples are given in Figure 104 and Figure 105);
– with small area contacting applicator, typically for paint removal and spot-heating (an
example is given in Figure 107).
NOTE 101 Appliances with insertion applicator and with large area contacting applicator are portable
appliances. Appliances with small area contacting applicator are handheld appliances.
NOTE 102 Appliances that use non-electrical energy are within the scope of this standard. The microwave-related
portion is considered motor-operated.
NOTE 103 Attention is drawn to the fact that
– these appliances can radiate microwave energy outside a restricted area where they are used. The additional
requirements specified by national authorities responsible for the protection for non-ionising radiation that the
limit of power flux density is 10 W/m , averaged over any time period of 6 min, outside this restricted area is
taken into consideration in this standard;
– these appliances are intended to exclusively treat the load in normal operation, i.e. this standard does not
apply to appliances or systems employing free space microwave propagation;
– for appliances intended to be used in tropical countries, special requirements can be necessary;
– in many countries, additional requirements are specified by the national health authorities, and national
authorities responsible for the protection of labour and for non-ionising radiation protection.
NOTE 104 This standard does not apply to
– household microwave ovens, including combination microwave ovens (IEC 60335-2-25);
– commercial microwave ovens with a cavity door, commercial combination microwave ovens with a cavity door
and commercial microwave ovens without a cavity door and with transportation means (IEC 60335-2-90);
– industrial microwave heating equipment (IEC 60519-6);
– appliances for medical purposes (IEC 60601-1);

© IEC 2019
– appliances and equipment for laboratory use (series of IEC 61010);
– 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).
NOTE 105 Some of the specifications and tests in this standard are not applicable for other than 2 450 MHz
appliances.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60335-2-90, Household and similar electrical appliances – Safety – Part 2-90: Particular
requirements for commercial microwave ovens
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs and safety markings
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.7 Addition:
Note 101 to entry: The rated frequency is the input frequency.
3.1.9 Replacement:
normal operation
heating operation of the appliance under the following conditions:
The appliance is operated according to the manufacturer’s instructions for intended use.
However, using a typical load for intended use may be impractical, since it may be part of a
building, unless the manufacturer makes useful and realistic such loads available for the
tests. If that is not the case, the appliance is operated under the following conditions:
The initial temperature of the test load which is used for microwave energy absorption shall
be (20 ± 5) °C.
The highest generator power settings are to be used.
Appliances with an insertion applicator for moisture removal are operated by insertion into
holes in floor, wall or ceiling structures under the following conditions:
a) The test load consists of a metal tank filled with water, having an open top water surface
exceeding that of the horizontal dimensions of the appliance by at least 70 mm on all
sides and having a water column height of at least 150 mm plus the length of the longest
insertion distance of the insertion applicator. At the top sides of the tank there are
horizontal supports of a microwave-transparent material, with a suitable opening for the
applicator antenna. The water level is adjusted so that the distance from the housing of
the appliance to the test load is the same as in its intended use.
Note 101 to entry: If it is obvious that good microwave impedance matching of the insertion applicator can be
obtained only if the hole into which it is inserted is not water-filled, a sleeve or similar of a highly microwave
transparent material such as PTFE is used around the insertion applicator. If wave propagation in the axial
direction occurs in the test set-up and the manufacturer can show that it is not possible in actual use, or monitoring
devices then shut down the insertion applicator, a thin-wall plastic tube with inner diameter corresponding to the
maximum hole diameter according to the manufacturer’s specification can be used.

– 10 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
b) Appliances with large area contacting applicator for drying of floor, wall or ceiling
structures are operated under the following conditions: the test load consists of a metal
tank filled with water, having an open top water surface exceeding that of the horizontal
dimensions of the appliance by at least 70 mm on all sides and having a water column
height of at least 150 mm. At the top of two opposite tank sides there are horizontal
supports of a microwave-transparent material, extending just so far inwards that the
traction drive rests on the support. The water level is adjusted so that the distance from
the applicator to the test load is the same as in its intended use.
The proper reversal function of the traction drive is tested under the following conditions:
the appliance is operated on a horizontal plywood surface with a thickness of 20 mm and
an area sufficient to allow back and forth movement between blocks representing walls.
Note 102 to entry: If needed for representative operation of the appliance, the horizontal supports are extended
as to activate the mechanical microwave interlocks.
Appliances with small area contacting applicator for paint removal and spot-heating are
operated under the following conditions:
The test load consists of a grinding wheel or grinding block made of fine-grained silicon
carbide at least 15 mm in thickness, and its length and width exceeding the corresponding
dimensions of the applicator opening by at least 30 mm; however this test load shall be so
large that it can be air-cooled from the underside without the appliance being influenced.
3.101
microwave appliance with insertion, large or small area contacting applicator
commercial appliance using electromagnetic energy in one or several of the ISM frequency
bands between 300 MHz and 30 GHz, for supplying energy to an external load which is
heated so that a resulting process of drying, moisture transport which may result in forces due
to formation of steam, decomposition or chemical modification, melting, or termination of
organisms such as bacteria or fungus occurs
Note 1 to entry: ISM frequency bands are the electromagnetic frequencies established by the ITU and reproduced
in CISPR 11.
Note 2 to entry: Food and beverages are not loads in the meaning of this standard.
3.102
applicator
structure which applies the microwave energy to the load
3.103
load
object to be treated into which the applicator is introduced or put in close position to
3.104
microwave transparency
property of a material having negligible absorption and reflection of microwaves
Note 1 to entry: The relative permittivity of a microwave transparent material is less than 7 and the relative loss
factor is less than 0,015.
3.105
insertion applicator
applicator for insertion into the load, in which all available microwave power is intended to
be absorbed
3.106
large area contacting applicator
applicator with a metallic enclosure, having at least one geometric non-metallic opening
through which microwave energy is applied to a closely located external load in which all
available microwave power is intended to be absorbed

© IEC 2019
3.107
small area contacting applicator
applicator with a metallic enclosure, having at least one geometric non-metallic opening or
appropriate device through which microwave energy is applied to a very closely located
external load in which all rated microwave power is intended to be absorbed
3.108
rated microwave power output
microwave power output assigned to the appliance by the manufacturer
Note 1 to entry: This can be lower than the available microwave power, due to intentional microwave power
losses in microwave absorbers (see Note in 101.1) and coaxial cables acting for protection of the microwave
generator of small area contacting applicators (see 22.101).
3.109
available microwave power
the microwave generator nominal output under impedance matched condition which is
obtained by the generator manufacturer specification and measurement of its electrical input
to the generator in the appliance during the first 10 s of operation at maximum power
Note 1 to entry: Magnetrons will typically have a stationary power output 3 s after energising.
3.110
instructed person
person who is sufficiently instructed and monitored to know how to avoid any danger caused
by the operation of a microwave appliance with insertion applicator, large area contacting
applicator, or small area contacting applicator
3.111
skilled person
person with suitable professional education, knowledge and experience to discern and to
avoid any danger caused by the operation of a microwave appliance with insertion
applicator, large area contacting applicator, or small area contacting applicator
3.112
ordinary person
person who is neither a skilled person nor an instructed person
3.113
traction drive
means or system used to accomplish movement of an appliance with large area contacting
applicator on a floor
3.114
microwave enclosure
overall structure that is intended to confine the microwave energy
Note 1 to entry: Barriers mounted outside the microwave enclosure are not considered a part of it.
3.115
microwave barrier
microwave transparent part of the microwave appliance that is mounted outside the
microwave enclosure for limiting access into it and can only be removed with the aid of
tools
Note 1 to entry: A microwave barrier can be mounted between the microwave enclosure and the external cover
of the appliance.
Note 2 to entry: Devices such as an array of metal chains or hinged metal plates at the periphery of the opening
of an applicator intended to reduce microwave leakage are not considered microwave barriers.
Note 3 to entry: Microwave barriers cannot be hinged or flexed.

– 12 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
3.116
microwave guard
constructive part of the appliance that is mounted outside or at the microwave enclosure for
reducing microwave leakage by shielding and/or absorption and can only be removed with the
aid of tools
Note 1 to entry: Microwave guards can move or open when the applicator is brought into contact with the load.
Note 2 to entry: Devices such as an array of metal chains or hinged metal plates at the periphery of the opening
of an applicator intended to reduce microwave leakage are considered microwave guards.
3.117
maintenance door
constructive part of the appliance that can be opened or removed with the aid of tools to get
access for service and repair
3.118
microwave interlock
device or system that prevents the operation of the microwave generator if conditions of
excessive microwave leakage occur or are likely to occur
Note 1 to entry: Examples of microwave interlock are switches which stop the microwave power when a
contacting applicator is lifted up or an insertion applicator is removed from its load during operation, and an
integral leakage monitor which does the same if there is insufficient proximity between an applicator and the load
or if an attempt is made to start the appliance without a load.
3.119
intended use
any use of the appliance which is reasonably foreseeable, as described in the user
instructions, and which is consistent with such activities as operating, starting, stopping,
connecting to or disconnecting from the supply mains
3.120
control
any control device requiring the operator’s actuation to perform specific functions
3.121
viewing opening
opening into the applicator through which the treatment can be visually monitored
3.122
restricted area
the space where the operation of the equipment takes place, plus any area outside this where
the exposure level from the equipment may exceed 10 W/m , averaged over any 6 min
Note 1 to entry: The restricted area is determined by measuring the microwave leakage through floor, wall or
ceiling structures of the treatment zone. The thickness of the load in the radially outgoing direction from the
applicator is considered only if the load is accessible from behind for microwave leakage measurements in
normal operation.
3.123
biased-off switch
switch that automatically returns to the off-position when its actuating member is released
3.124
start switch
biased-off switch that shall be actuated by the operator before the operation switch will
function
© IEC 2019
3.125
operation switch
biased-off switch designed so that it will automatically disconnect the microwave generator
or the supply main circuit when the operator’s actuating force is removed
4 General requirement
This clause of Part 1 is applicable except as follows.
4.101 Instead of the requirements on supervision of the microwave interlocks by monitored
microwave interlocks as in IEC 60335-2-90, this standard applies the concepts of restricted
area and microwave leakage checks of microwave interlock function for large area
contacting applicators and insertion applicators – and start switch as well as operation
switch for small area contacting applicators.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.3 Modification:
Instead of carrying out the tests in the order of clauses, the following sequence of clauses
and subclauses applies: 32, 22.107, 101, 7 to 17, 20, 21, 18, 19, 22 (except 22.107), 23 to 31.
NOTE 101 Clause 101 deals with the protection against leakage by basic design of microwave enclosures;
Clause 22 deals with the additional requirements applicable when handling and against improper handling of the
appliance, and against other hazards caused by the microwaves; Clause 32 deals with the leakage measurement
instrumentation and handling, plus limiting values.
5.101 Addition:
The microwave-related portion of the appliance is considered motor-operated.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Microwave appliances shall be class I.
6.2 Addition:
Large area contacting applicators and insertion applicators shall be at least IPX1. Small
area contacting applicators shall be at least IPX5.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Modification:
Add the following new dashed item and text before the last dashed item of Part 1:
– substance of the following warnings, if applicable:

– 14 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
– WARNING: Switch off and remove plug from mains before adjusting, cleaning or if
the cord is entangled or damaged.
– WARNING: Read the instruction sheet.
– WARNING: Keep the flexible supply cord away from the microwave-energised
parts.
Where appropriate IEC/ISO symbols or pictograms are available, they may be used.
Add the following new text before the compliance paragraph of Part 2-110:
Where appropriate, appliances shall be marked with symbols ISO 7000-0434A (2004-01) and
IEC 60417-6167 (2012-07).
Addition:
Appliances shall be marked with the nominal frequency in megahertz of the ISM band in which
they operate.
Appliances shall be marked with the rated microwave power output.
Appliances shall be marked on an affixed inspection tag or similar, with the date when the
latest complying microwave leakage and function test in accordance with the service manual
was carried out.
Compliance is checked by inspection.
7.6 Addition:
[symbol IEC 60417-6166 caution, non-ionizing radiation
(2012-07)]
[symbol IEC 60417-6167 keep out of microwave radiation
(2012-07)]
[symbol ISO 7010-P004 no thoroughfare
(2011-05)]
7.12 Addition:
The instructions shall include the substance of the following.
– WARNING: If microwave barriers or microwave guards are damaged, the appliance
must not be operated until repairs by a skilled person have been carried out;
– WARNING: It is hazardous for anyone other than a skilled person to carry out any service
or repair operation that involves the removal of any cover or barrier which gives protection
against exposure to microwave energy;
– if smoke is observed, switch off or unplug the appliance;

© IEC 2019
– failure to maintain the appliance in a clean condition could lead to deterioration that could
adversely affect the life of the appliance and possibly result in a hazardous situation;
– the appliance shall not be cleaned with a water jet.
The substance of the following warnings, if applicable, shall be placed in a prominent position
on the appliance. The letters, which may be in upper or lower case, shall be a minimum of
3 mm high, in black on a yellow background. Where appropriate IEC/ISO symbols or
pictograms are available, they may be used. Markings or symbols giving cautionary
information shall be located close to the hazard.
– WARNING: Switch off and remove plug from mains before adjusting, cleaning or if the
cord is entangled or damaged.
– WARNING: Read the instruction sheet.
– WARNING: Keep the flexible supply cord away from the microwave-energised parts.
A microwave warning sign (IEC 60417-5140 (2003-04)) of a size specified in IEC 60417, shall
be placed in a location where any microwave barrier or microwave guard is visible, or near
the opening in the microwave barrier of a contacting applicator under which there is a
load.
The warning text shall include the substance of the following:
WARNING
MICROWAVE ENERGY
DO NOT INSERT THE HAND OR FOREIGN OBJECTS
The same type of warning sign shall be placed at viewing openings with holes larger than
diameter 12 mm and which are not protected by visually transparent protective devices. A
warning not to insert objects shall also be given.
Appliances shall be operated only by instructed persons or skilled persons.
An instruction sheet shall be supplied with the appliance.
The instructions shall include:
a) those warnings required to be marked on the appliance together with further explanation,
where appropriate;
b) specifications of the load surface irregularities (non-flatness) with which the appliance
may be used;
c) that the appliance shall not be used in standing water;
d) advice on the use and type of extension cords to be used (not lighter than required in
25.7);
e) instructions for fitting and use of attachments, if any;
f) the substance of the following, where appropriate:
WARNING: If parts of viewing openings, microwave barriers, microwave guards, the
housing or any other means named by the manufacturer are damaged, the appliance shall
not be operated until it is repaired by a skilled person. Until repairs are carried out, the

– 16 – IEC 60335-2-110:2013+AMD1:2019 CSV
© IEC 2019
appliance shall be set in a permanent non-operational condition (e.g. wi
...