IEC 60335-2-111:2015

Household and similar electrical appliances - Safety - Part 2-111: Particular requirements for electric ondol mattress with a non-flexible heated part

IEC 60335-2-111:2015 deals with the safety of electric ondol-mattresses for household and similar purposes, their rated voltage being not more than 250 V. This standard also applies to control units supplied with the appliance. 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 in community spas or by persons in cold ambient temperatures, are within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by appliances that are encountered by all persons in and around the home. However, in general, it does not take into account the use of appliances by young children or infirm persons without supervision or children playing with the appliance. It was established on the basis of the fifth edition (2010) of that standard. The attention of National Committees is drawn to the fact that equipment manufacturers and testing organizations may 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 standard be adopted for implementation nationally not earlier than 12 months or later than 36 months from the date of its publication. Key words: ondol mattress, heating element, non-flexible heated part
This publication is to be read in conjunction with IEC 60335-1:2013.

Appareils électrodomestiques et analogues - Sécurité - Part 2-111: Exigences particulières pour les matelas électriques ondol avec une partie chauffée non flexible

L'IEC 60335-2-111:2015 traite de la sécurité des matelas ondol électriques pour usages domestiques et analogues, dont la tension assignée n'est pas supérieure à 250 V. La présente norme s'applique également aux unités de commande alimentées par l'appareil. Les appareils non destinés à un usage domestique normal mais qui néanmoins peuvent constituer une source de danger pour le public, tels que les appareils destinés à être utilisés dans les stations thermales ou par des personnes séjournant à des températures ambiantes froides, relèvent du domaine d'application de la présente norme. Dans la mesure du possible, la présente norme traite des dangers ordinaires présentés par les appareils, encourus par tous les individus à l'intérieur et autour de l'habitation. Cependant, cette norme ne tient pas compte en général de l'utilisation des appareils par des jeunes enfants ou des personnes handicapées sans surveillance ou de l'emploi de l'appareil comme jouet par des jeunes enfants. Elle a été établie sur la base de la cinquième édition (2010) de cette norme. L'attention des Comités nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication IEC, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois ou au plus tard 36 mois après la date de publication. Mots-clés: matelas ondol, élément chauffant, partie chauffée non flexible
Cette publication doit être lue conjointement avec la CEI 60335-1:2013.

General Information

• Status: Published
• Publication Date: 19-Jan-2015
• ICS: 13.120 - Domestic safety
• ICS: 97.100.10 - Electric heaters
• ICS: 97.140 - Furniture
• Technical Committee: TC 61 - Safety of household and similar electrical appliances
• Drafting Committee: MT 37 - TC 61/MT 37
• Current Stage: DELPUB - Deleted Publication
• Start Date: 14-Oct-2024
• Completion Date: 23-Jun-2023

Relations

• Revised: IEC 60335-2-111:2024 - Household and similar electrical appliances - Safety - Part 2-111: Particular requirements for electric ondol mattress with a non-flexible heated part
• Effective Date: 05-Sep-2023

Overview

IEC 60335-2-111:2015 is an international safety standard published by the International Electrotechnical Commission (IEC). It specifically addresses the safety requirements for electric ondol mattresses with a non-flexible heated part designed for household and similar uses. The standard applies to appliances with a rated voltage not exceeding 250 V and also covers associated control units.

Electric ondol mattresses, traditional heating devices widely used in various regions, present unique safety risks such as electrical, mechanical, thermal, and fire hazards. IEC 60335-2-111:2015 aims to mitigate these risks by providing detailed safety requirements to ensure the safe design, manufacture, and operation of these appliances under normal and abnormal conditions. It complements the general requirements outlined in IEC 60335-1:2013 and integrates additional specific provisions tailored for electric ondol mattresses.

The standard also extends to appliances used outside typical household environments, such as community spas or cold ambient locations, reflecting its broad scope concerning user safety.

Key Topics

• Scope and Application
  Defines electric ondol mattresses with non-flexible heated sections intended for household or similar use, including control units, operating at voltages up to 250 V.

• General Safety Requirements
  Builds on IEC 60335-1 by supplementing it with requirements specific to ondol mattress heating elements, focusing on protection against hazards such as overheating, electrical shock, and mechanical damage.

• Testing Methods
  Introduces testing protocols, including power input verification, electrical strength, leakage current measurement, transient overvoltage resistance, moisture resistance, and endurance under normal and abnormal operating conditions.

• Marking and Instructions
  Emphasizes clear labeling and comprehensive user instructions to ensure safe operation, maintenance, and handling of the heating elements and control units.

• Construction and Components
  Details requirements for internal wiring, components, supply connections, and mechanical strength, ensuring robust and durable appliance construction.

• Protection Mechanisms
  Guidelines on overload protection of transformers and circuits, stability against mechanical hazards, and prevention of access to live parts.

• Compatibility with Wiring Rules
  Ensures appliances conform with international wiring standards (IEC 60364) to guarantee safe installation and operation in various national contexts.

Applications

IEC 60335-2-111:2015 is critical for manufacturers, testing organizations, and certification bodies involved with:

• Electric Ondol Mattress Design
  Ensuring products meet international safety criteria before entering the market.

• Quality Assurance and Compliance Testing
  Performing standardized tests to validate electrical, thermal, and mechanical safety, thus reducing risk of fire, shock, or injuries.

• Product Development for Cold Climates
  Appliances intended for use in colder environments or community health spas benefit from better safety assurances.

• Consumer Safety Education
  Providing clear instructions and warnings aligned with IEC standards improves user awareness of safe operation.

• National and Regional Standard Implementations
  Guiding regulators and standards committees to adopt consistent safety frameworks within 12 to 36 months after publication of this IEC standard.

Related Standards

• IEC 60335-1:2013
  The general safety standard for household and similar electrical appliances, which IEC 60335-2-111 supplements for ondol mattresses.

• IEC 60364
  Governs electrical installation and wiring rules, referenced for compatibility with appliance connection safety.

• Other IEC 60335 Part 2 Standards
  Address safety requirements for appliances with specific functions; when multiple functions exist, relevant parts are applied individually.

Practical Value

Adopting IEC 60335-2-111:2015 ensures electric ondol mattresses are designed and tested to minimize risks of:

• Electrical shock or leakage currents
• Fire hazards due to overheating or fault conditions
• Mechanical failures potentially causing injury
• Malfunction during abnormal operation
• Usage errors through clear marking and user guidance

This standard supports safer electric ondol mattress products worldwide, enhancing consumer confidence and fostering international trade compliance.

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Keywords: electric ondol mattress safety, IEC 60335-2-111, household electrical appliances safety, non-flexible heated part, heating element standards, appliance electrical testing, thermal hazard prevention, electrical appliance certification, household heating device standards

Standards Content (Sample)

IEC 60335-2-111 ®
Edition 1.0 2015-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-111: Particular requirements for electric ondol mattress with a non-flexible
heated part
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-111: Exigences particulières pour les matelas électriques ondol
avec une partie chauffée non flexible

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IEC 60335-2-111 ®
Edition 1.0 2015-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-111: Particular requirements for electric ondol mattress with a non-

flexible heated part
Appareils électrodomestiques et analogues – Sécurité –

Partie 2-111: Exigences particulières pour les matelas électriques ondol

avec une partie chauffée non flexible

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120; 97.100.10; 97.140 ISBN 978-2-8322-2186-0

– 2 – IEC 60335-2-111:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirement . 7
5 General conditions for the tests . 7
6 Classification . 8
7 Marking and instructions . 8
8 Protection against access to live parts . 9
9 Starting of motor-operated appliances . 9
10 Power input and current . 9
11 Heating . 9
12 Void . 10
13 Leakage current and electric strength at operating temperature . 10
14 Transient overvoltages . 10
15 Moisture resistance . 10
16 Leakage current and electric strength . 10
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 11
20 Stability and mechanical hazards . 12
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 13
24 Components . 13
25 Supply connection and external flexible cords . 13
26 Terminals for external conductors . 13
27 Provision for earthing . 14
28 Screws and connections . 14
29 Clearances, creepage distances and solid insulation . 14
30 Resistance to heat and fire . 14
31 Resistance to rusting . 14
32 Radiation, toxicity and similar hazards . 14
Bibliography . 17

Figure 101 – Arrangement for measuring leakage current and electric strength of the
ondol-mattress . 15
Figure 102 – Positioning of the thermal insulation on an ondol-mattress incorporating
thermostats . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-111: Particular requirements for electric ondol
mattress with a non-flexible heated part

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 60335-2-111 has been prepared by IEC technical committee 61:
Safety of household and similar electrical appliances.
It forms the first edition of IEC 60335-2-111.
The text of this standard is based on the following documents:
FDIS Report on voting
61/4826/FDIS 61/4873/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.

– 4 – IEC 60335-2-111:2015 © IEC 2015
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 electric ondol mattress
with a non-flexible heated part.
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 may 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 standard be adopted for implementation
nationally not earlier than 12 months or later than 36 months from the date of its publication.
A list of all parts of the IEC 60335 series, under the general title: Household and similar
electrical appliances – Safety, can be found on the IEC website.
The committee has decided that the contents of this 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.
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 that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of
the requirements and, if found to be substantially equivalent, may be considered to comply
with the standard.
– 6 – IEC 60335-2-111:2015 © IEC 2015
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-111: Particular requirements for electric ondol
mattress with a non-flexible heated part

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric ondol-mattresses for household
and similar purposes, their rated voltage being not more than 250 V.
This standard also applies to control units supplied with the appliance.
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 in community spas or by
persons in cold ambient temperatures, are within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by
appliances that are encountered by all persons in and around the home. However, in general,
it does not take into account
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.
NOTE 101 This standard does not apply to
– appliances intended exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the presence of a
corrosive or explosive atmosphere (dust, vapour or gas);
– blankets, pads and similar flexible heating appliances (IEC 60335-2-17);
– room heaters (IEC 60335-2-30);
– water bed heaters (IEC 60335-2-66);
– heating appliances for breeding and rearing animals (IEC 60335-2-71);
– foot warmers and heating mats (IEC 60335-2-81);
– flexible sheet heating elements for room heating (IEC 60335-2-96);
– heated carpets and for heating units for room heating installed under removable floor coverings
(IEC 60335-2-106);
– appliances specifically intended for use under medical supervision (IEC 80601-2-35).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
ISO 2439, Flexible cellular polymeric materials – Determination of hardness (indentation
technique)
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions:
The ondol-mattress is placed on the floor of the test corner away from the walls, any legs
forming part of the bed frame being removed.
The base of the bed frame is replaced by a piece of 20 mm thick plywood. The ondol-plate is
covered by a sheet of thermal insulation.
Note 1 to entry: The specification for the thermal insulation is given in Annex AA.
3.101
heating element
heating conductor such as a heating sheet or wires covered with insulation material
3.102
ondol-mattress
appliance comprising an ondol-plate that incorporates an imbedded heating element that
heats the ondol-plate, and a bed frame that supports the ondol-plate
Note 1 to entry: Ondol-plates are usually made from inorganic material such as stone or loess.
3.103
control unit
device, incorporated in the bed frame or external to the bed frame, by means of which the
average power input of the appliance can be adjusted or regulated
Note 1 to entry: Multi-position cord switches are not considered to be control units unless they incorporate
components for regulating the power input.
3.104
controlled appliance
appliance incorporating means in the ondol-mattress for sensing changes in temperature
when the appliance is operated under normal operation, thus automatically controlling the
average power input
3.105
bed frame
frame that supports the ondol-plate
Note 1 to entry: The bed frame may incorporate legs to provide a gap between the underside of the ondol-plate
and the floor.
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.
5.8.101 Controlled appliances are supplied as specified for motor-operated appliances.

– 8 – IEC 60335-2-111:2015 © IEC 2015
6 Classification
This clause of Part 1 is applicable.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with
– the rated power input;
– symbol ISO 7000-0790 (2004-01) or "Please read the instructions";
– symbol ISO 7000-0434A (2004-01) or Caution: Do not use with a helpless person, an
infant or a person insensitive to heat.
Appliances to be used with a detachable control unit shall be marked with the reference of
the control unit to be used.
Appliances to be used with a detachable transformer shall be marked with the reference of
the transformer to be used.
Detachable control units and detachable transformers shall be marked with the reference
of the appliances with which they can be used.
7.12 Addition:
The instructions shall contain the substance of the following:
Important instructions. Retain for future use.
The instructions shall contain the substance of the instructions required in 7.1. If symbols are
used, they shall be explained.
The instructions shall specify the appropriate settings of controls for continuous use of the
appliance.
This appliance is not intended for medical use in a hospital.
This appliance must not be used by persons insensitive to heat and other very vulnerable
persons who are unable to react to overheating.
The instructions for appliances provided with detachable control units or detachable
transformers shall state that the appliance is only to be used with the types that are marked
on the appliance.
Examine the appliance frequently for signs of wear or damage. If there are such signs, if the
appliance has been misused or does not work, discontinue use and notify the supplier.
7.101 Detachable control units shall be marked with a reference number or by other
means of identification.
Compliance is checked by inspection.

8 Protection against access to live parts
This clause of Part 1 is applicable.
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 Modification:
When there is a separate control unit, it is placed away from the appliances.
11.3 Addition:
Thermocouples used for determining the surface temperature of the ondol-mattress are
soldered to plates of copper or brass measuring 65 mm × 65 mm × 0,5 mm. The temperatures
are determined in at least four places.
11.7 Replacement:
Appliances are operated until steady conditions are established.
11.8 Addition:
The surface temperature of the ondol-mattress shall not exceed 56 °C.
11.101 It shall be possible to operate the ondol-mattress without risk of heatstroke to the
user.
Compliance is checked by the following test.
The appliance is operated under normal operation supplied as specified in 11.4. The control
units or cord switch is adjusted to the highest setting recommended for continuous use.
When steady conditions are established, but at least 1 h after switching on the appliance, the
surface temperature is measured. The temperature of the surface of the ondol-mattress is
determined by means of a thermocouple attached to the centre of a plate of copper or brass
having dimensions 300 mm × 300 mm × 0,5 mm.
The temperature shall not exceed 37 °C.

– 10 – IEC 60335-2-111:2015 © IEC 2015
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.1 Modification:
For testing the ondol-mattress, a sheet of metal foil, approximately 0,1 mm thick and of
sufficient size to cover the area of that part of the ondol-mattress incorporating the current-
carrying parts, is inserted between the ondol-mattress and the sheet of thermal insulation. A
uniformly distributed load of approximately 35 kg/m is placed on the sheet of thermal
insulation.
The arrangement is shown in Figure 101.
13.2 Modification:
The leakage current is measured between any pole of the supply and the sheet of metal foil.
The leakage current for the ondol-mattress shall not exceed 1 mA/m of the heating part with
a maximum of 2,5 mA.
13.3 Modification:
For the ondol-mattress, the test voltage is applied between live parts and the sheet of metal
foil.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:
A quantity of the solution corresponding to 1 l/m of the upper surface area of the ondol-
mattress is poured uniformly over the ondol-mattress at the rate of approximately 1 l/min.
The solution is allowed to soak into the ondol-mattress for a period of 30 min.
After 30 min, the appliance shall then 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 and creepage distances below the values specified in Clause 29.
16 Leakage current and electric strength
This clause of Part 1 is applicable except as follows.
16.2 Addition:
A sheet of metal foil, approximately 0,1 mm thick and of sufficient size to cover the area of
that part of the ondol-mattress incorporating the current-carrying parts, is inserted between
the ondol-mattress and the sheet of thermal insulation. A uniformly distributed load of
approximately 35 kg/m is placed on the top sheet of thermal insulation.
The leakage current for heating part shall not exceed 2,5 mA.
16.3 Addition:
After the ondol-mattress is covered with metal foil, it is tested with the voltage applied
between live parts and the sheet of metal foil.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is applicable.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.1 Modification:
Instead of the tests specified, the following applies.
The appliance is subjected to the tests of 19.101, 19.102 and 19.103.
The appliances incorporating electronic circuits are also subjected to the tests of 19.11,
19.12 and 19.14.
The appliance is supplied with a voltage
– between 0,9 times and 1,1 times the rated voltage, for controlled appliances;
– resulting in a power input between 0,85 times and 1,24 times the rated power input, for
other appliances.
19.13 Addition:
The temperature of the surface of the ondol-mattress shall not exceed 80 °C.
19.101 Appliance are operated under normal operation except that the sheet of thermal
insulation covers only the part of ondol-mattress. The test is carried out eight times, the
boundary of the area covered being in turn parallel to each of the sides and to the diagonals
of the ondol-mattress as shown in Figure 102.
19.102 Appliances are operated under the conditions specified in Clause 11. Any control
that limits the temperature during the test of Clause 11 is short-circuited.
19.103 Ondol-mattresses shall be constructed so that failure of a component, other than
heating elements or internal wiring, does not give rise to a temperature which could be
hazardous to the human body.
– 12 – IEC 60335-2-111:2015 © IEC 2015
Compliance is checked by carrying out the test of 11.101 but simulating failure of components
which might reasonably be expected to occur in normal use. During the test, the temperature
of the surface of the ondol-mattress shall not exceed 56 °C.
Appliance can have one overshoot of up to 85 °C provided when the temperature exceeds
56 °C a non-self resetting thermal cut-out operates.
20 Stability and mechanical hazards
This clause of Part 1 is applicable except as follows.
20.1 Addition:
The test is only applied to control units intended to be placed on a surface.
21 Mechanical strength
This clause of Part 1 is applicable except as follows.
21.1 Addition:
Control units intended to be placed on a surface are also subjected to the test of 21.101.
21.101 The control unit is dropped from a height of 40 mm onto a rigidly mounted steel
plate having a thickness of at least 15 mm and a mass of at least 15 kg. It is dropped so that
it lands on its base, the test being carried out 100 times.
A sandbag with the weight of 80 kg and a square bottom with a length of 300 mm on each
side is placed on the control unit for one minute.
The control unit is then dropped three times from a height 500 mm onto a hardwood floor by
pulling it from a horizontal support by means of its cord so that it falls freely.
After the test, the control unit shall not be damaged to such an extent that compliance with
this standard is impaired. If the control unit still operates, the appliance shall withstand the
tests of Clause 11.
22 Construction
This clause of Part 1 is applicable except as follows.
22.101 The ondol-mattress shall be constructed so that heating elements and internal
wiring are retained in their intended position. No part of the heating element shall cross over
another part of the heating element.
Crossing of internal wiring shall be avoided as far as possible. When this is unavoidable, the
wiring shall be secured in order to prevent any relative movement.
Compliance is checked by inspection.
22.102 The insulation of heating elements and internal wiring shall be integral with the
conductors in the heating part, for other than class III construction.
Compliance is checked by inspection.

22.103 Control units intended to stand on a table shall not have openings on the underside
that could allow small items to penetrate and touch live parts.
Compliance is checked by inspection and measuring the distance between the supporting
surface and live parts through openings. This distance shall be at least 8 mm.
22.104 Control units that automatically switch from a high heat output to a low heat output
after a pre-set time shall not automatically switch back to the high heat output setting.
Compliance is checked by inspection and during the test of 11.101.
22.105 Fuse links or thermal links that are incorporated to protect the ondol-mattress
against overheating or ignition shall not be replaceable by the user.
Compliance is checked by inspection.
23 Internal wiring
This clause of Part 1 is applicable.
24 Components
This clause of Part 1 is applicable except as follows.
24.1.4 Modification:
Thermostats are operated for 100 000 cycles of operation and self-resetting thermal cut-
outs for 10 000 cycles of operation.
24.101 Thermal cut-outs incorporated in appliances for compliance with 19.102 shall not be
self-resetting.
Compliance is checked by inspection.
25 Supply connection and external flexible cords
This clause of Part 1 is applicable except as follows.
25.2 Addition:
Ondol-mattresses having two separate heated areas may have two means of connection to
the supply.
25.15 Modification:
Flexible cords connected to the ondol-mattress are subjected to a pull force of 100 N that is
only applied three times for 1 min each time, the longitudinal measurement not being made.
Flexible cords connected to switches and control units are subjected to a pull force of 100 N.
26 Terminals for external conductors
This clause of Part 1 is applicable.

– 14 – IEC 60335-2-111:2015 © IEC 2015
27 Provision for earthing
This clause of Part 1 is applicable.
28 Screws and connections
This clause of Part 1 is applicable except as follows.
28.2 Addition:
The requirement does not apply to the connections to the heating elements.
29 Clearances, creepage distances and solid insulation
This clause of Part 1 is applicable.
30 Resistance to heat and fire
This clause of Part 1 is applicable except as follows.
30.2.2 Not applicable.
31 Resistance to rusting
This clause of Part 1 is applicable.
32 Radiation, toxicity and similar hazards
This clause of Part 1 is applicable.

A
1 2
C D E
B
F
IEC
Key
A circuit of Figure 4 of IEC 60990
B sheet of thermal insulation
C ondol-mattress
D uniformly distributed load
E aluminium foil
F plywood base
Figure 101 – Arrangement for measuring leakage current
and electric strength of the ondol-mattress
A
IEC
Key
A thermal insulation
Figure 102 – Positioning of the thermal insulation on
an ondol-mattress incorporating thermostats

– 16 – IEC 60335-2-111:2015 © IEC 2015
Annexes
The annexes of Part 1 are applicable except as follows:
Annex AA
(normative)
Specification for thermal insulation

The thermal insulation has the following composition:
+2
– cell count: 18 per cm
+10
– specific mass: 30 kg/m %
– hardness: 120 N to 170 N at 40 % impression, measured according to ISO 2439
– thickness: 25 mm
Bibliography
The bibliography of Part 1 is applicable except as follows.
Addition:
IEC 60335-2-17, Household and similar electrical appliances – Safety – Part 2-17: Particular
requirements for blankets, pads and similar flexible heating appliances
IEC 60335-2-30, Household and similar electrical appliances – Safety – Part 2-30: Particular
requirements for room heaters
IEC 60335-2-66, Household and similar electrical appliances – Safety – Part 2-66: Particular
requirements for water-bed heaters
IEC 60335-2-71, Household and similar electrical appliances – Safety – Part 2-71: Particular
requirements for electrical heating appliances for breeding and rearing animals
IEC 60335-2-81, Household and similar electrical appliances – Safety – Part 2-81: Particular
requirements for foot warmers and heating mats
IEC 60335-2-96, Household and similar electrical appliances – Safety – Part 2-96: Particular
requirements for flexible sheet heating elements for room heating
IEC 60335-2-106, Household and similar electrical appliances – Safety – Part 2-106:
Particular requirements for heated carpets and for heating units for room heating installed
under removable floor coverings
IEC 80601-2-35, Medical electrical equipment – Part 2-35: Particular requirements for the
basic safety and essential performance of heating devices using blankets, pads and
mattresses and intended for heating in medical use

_____________
– 18 – IEC 60335-2-111:2015 © IEC 2015
SOMMAIRE
AVANT-PROPOS . 19
INTRODUCTION . 22
1 Domaine d’application . 23
2 Références normatives . 23
3 Termes et définitions . 24
4 Exigences générales . 24
5 Conditions générales d'essais . 24
6 Classification . 25
7 Marquage et instructions . 25
8 Protection contre l’accès aux parties actives . 26
9 Démarrage des appareils à moteur . 26
10 Puissance et courant . 26
11 Échauffements. 26
12 Vacant . 27
13 Courant de fuite et rigidité diélectrique à la température de régime . 27
14 Surtensions transitoires . 27
15 Résistance à l’humidité . 27
16 Courant de fuite et rigidité diélectrique . 27
17 Protection contre la surcharge des transformateurs et des circuits associés . 28
18 Endurance . 28
19 Fonctionnement anormal . 28
20 Stabilité et dangers mécaniques . 29
21 Résistance mécanique . 29
22 Construction . 29
23 Conducteurs internes. 30
24 Composants . 30
25 Raccordement au réseau et câbles souples extérieurs . 30
26 Bornes pour conducteurs externes . 31
27 Dispositions en vue de la mise à la terre . 31
28 Vis et connexions . 31
29 Distances dans l’air, lignes de fuite et isolation solide . 31
30 Résistance à la chaleur et au feu . 31
31 Protection contre la rouille . 31
32 Rayonnement, toxicité et dangers analogues .
...