IEC 60335-2-106:2021

IEC 60335-2-106 ®
Edition 2.1 2025-06
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
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
ICS 97.100.10, 13.120 ISBN 978-2-8327-0524-7
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CONTENTS
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General requirement . 8
5 General conditions for the tests . 9
6 Classification . 9
7 Marking and instructions . 10
8 Protection against access to live parts . 13
9 Starting of motor-operated appliances . 13
10 Power input and current . 13
11 Heating . 13
12 Charging of metal-ion batteries . 16
13 Leakage current and electric strength at operating temperature . 16
14 Transient overvoltages . 16
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 . 20
20 Stability and mechanical hazards . 22
21 Mechanical strength . 23
22 Construction . 26
23 Internal wiring . 28
24 Components . 28
25 Supply connection and external flexible cords . 29
26 Terminals for external conductors . 30
27 Provision for earthing . 30
28 Screws and connections . 30
29 Clearances, creepage distances and solid insulation . 30
30 Resistance to heat and fire . 30
31 Resistance to rusting . 32
32 Radiation, toxicity and similar hazards . 32
Annexes . 42
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 43
Bibliography . 44

Figure 101 – Arrangement for testing heating units . 33
Figure 102 – Arrangement for testing heating units to be used only above concrete or
similar floors . 34
Figure 103 – Arrangement for measuring leakage current and electric strength of the
flexible part . 35
Figure 104 – Jig for locating the contact needle . 36
Figure 105 – Arrangement for the three-thickness fold test . 37
Figure 106 – Equipment for flexing heating elements and internal wiring . 38
Figure 107 – Equipment for the spark ignition test . 39
Figure 108 – Details of the mask. 40
Figure 109 – Probe for measuring surface temperatures . 41

Table 102 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 15
Table 101 – Maximum temperature rises. 16

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

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
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6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60335-2-106 edition 2.1 contains the second edition (2021-11) [documents
61/6369/FDIS and 61/6419/RVD] and its amendment 1 (2025-06) [documents 61/7322/CDV
and 61/7406/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 60335-2-106 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1, 5.2, 5.3, 5.6, 7.12.1, 7.101,
10.1, 18.101.1, 18.101.2, 18.102.5, 19.1, 19.103, 21.1, 21.104, 21.105, 30.102);
c) requirements for portable heated carpets have been added (Clause 1, 5.2, 5.5, 6.1, 6.2, 7.1,
7.6, 7.12, 7.14, 7.101, 11.8, 15.1, 15.101, 16.1, 16.2, 16.3, 19.101, 19.102. 19.103, 21.105,
21.106, 24.1.5, 24.2, 29.3);
d) requirements for washable portable heated carpets have been added (5.3, 7.1, 7.6, 7.12,
7.14);
e) the test of 30.102 has been updated.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6369/FDIS 61/6419/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for heated carpets and for
heating units for room heating installed under removable floor coverings.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification", or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document 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 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 publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class III heating units only are allowed (Finland).

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of
– portable heated carpets;
– heated carpets and similar appliances;
– heating units to heat the room in which they are located and that are intended to be
installed directly under materials used as a removable floor covering such as carpet, cushion
vinyl, or loose laid laminate,
their rated voltage being not more than 250 V for single-phase installations and 480 V for other
installations, including direct current (DC) supplied appliances and battery-operated
appliances.
Attention is drawn to the fact that
– in many countries different wiring rules apply;
– for appliances intended to be used in vehicles or on board ships or aircraft, additional
requirements can be necessary;
– in many countries additional requirements are specified by the national authorities for fire
protection, the national authorities for building regulations, the national health authorities,
the national authorities responsible for the protection of labour and similar authorities.
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);
– heated mats and foot warmers with an area not exceeding 0,5 m (IEC 60335-2-81);
– flexible sheet heating systems permanently incorporated in the floor of the building structure
(IEC 60335-2-96);
– flexible heating elements incorporated in other appliances;.
– battery-operated appliances.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
IEC 60884-1:2002, Plugs and socket-outlets for household and similar purposes – Part 1:
General requirements
IEC 60884-1:2002/AMD1:2006
IEC 60884-1:2002/AMD2:2013
___________
There exists a consolidated edition 3.2:2013 that includes edition 3 and its Amendment 1 and Amendment 2.
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.9 Replacement Modification:
Replace the first paragraph with the following:
operation of the appliance under the following conditions:
heating units are installed under a layer of material having a thermal resistance of
approximately 0,1 m · K/W. Heating units, the current of which can vary depending on the
length of the heating element, and those that can supply other heating units are loaded so that
the current marked on the heating element flows through the heating unit.
3.5 Definitions relating to types of appliances
3.5.101
heating unit
heating element equipped with means for connection to the supply
3.5.102
modular heating unit
prefabricated assembly consisting of a heating unit and other materials
3.5.103
controlled appliance
appliance incorporating means in the flexible part for sensing the changes in temperature when
the appliance is operated under normal operation, thus automatically controlling the average
power input
3.5.104
heated carpet
appliance having an area exceeding 0,5 m on which the user's feet or body are placed in order
to warm them
3.6 Definitions relating to parts of an appliance
3.6.101
electrode
conductive part incorporated in a flexible sheet heating element for supplying the heating
material
3.6.102
flexible part
all layers of material forming the permanent enclosure of the appliance together with the heating
element, thermostats and all other current-carrying parts contained within it, which are
intended to be under or part of the floor covering
Note 1 to entry: The flexible part may be provided with a detachable cover.
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.2 Addition:
For laminated heated carpets, an additional appliance is required for the tests of 22.103.
For heating units, two additional appliances are required for the test of 18.102. For heating
units with deposited film or printed circuit heating elements, two additional appliances are
required for the test of 21.102.
For heated carpets that incorporate a wear indicator, such as a colour change, special samples
with the textile layer worn or removed to expose the indicator are required for the tests of
Clauses 11, 13, 18 and Subclauses 19.2, 19.101, 21.101, 21.102, 21.103 and 21.104.
The tests of 21.101 and 21.104 may be carried out on separate appliances.
A 15 m length of heating element or internal wiring is required for the tests of 21.105.
5.3 Addition:
The test of 21.101 may be carried out in conjunction with the conditioning in 18.102.2.
Washable portable heated carpets are laundered twice in accordance with the instructions
before testing is started.
5.5 Addition:
If portable heated carpets are provided with a detachable cover, tests are carried out with or
without this cover, whichever is the most unfavourable.
5.6 Addition:
Thermostats sensitive to room air temperature or outdoor air temperature are short circuited.
However, the thermostat is not short circuited if it can be set so that it does not cycle.
For electronic controls, it may be necessary to render the sensing elements inoperative instead
of short circuiting the thermostat.
5.10 Addition:
For heating units that are cut to measure, the tests are carried out after connecting the supply
leads and protecting the edges in accordance with the instructions.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Addition:
If a heating unit is classified, the relevant requirements apply.
Portable heated carpets shall be class II or III.
6.2 Addition:
Heating units and other floor mounted parts shall be at least IPX7.
Heated carpets, other than portable heated carpets, and similar appliances shall be IPX7.
This requirement does not apply to the plug for appliances connected via a supply cord fitted
with a plug or to wall-mounted controls.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Modification:
Instead of the marking of rated power input or rated current, the following applies:
Heating units shall be marked with their rated power input and the maximum rated current
at 20 ºC. Heating units that can be cut to measure shall be marked with their rated power
input per metre length.
Heating units shall be marked with their maximum current if
– the current can vary depending on the length of the heating unit; or
– other heating units can be supplied through them.
Appliances with detachable controls shall be marked with the reference number or by other
means of identification of the control.
Addition:
Heating units shall be marked with the indication of orientation, unless they are symmetrical.
The marking shall be repeated at least once every 0,5 m of the heating element or on each
section that can be cut to form a heating unit.
Heating units that can be cut to measure and have to be cut at specified places shall be marked
appropriately.
Heating units intended to be installed only above a floor of concrete or similar material shall
be permanently marked with the substance of the following:
In order to avoid a fire hazard, this heating unit is to be installed only above a floor of
concrete or similar material.
Flexible parts of the portable heated carpets shall be marked with the symbol ISO 7000-3114
(2011-10) and the symbol ISO 7000-3124 (2011-10) or the substance of the following:
Do not dry clean. Do not bleach.
In addition, portable heated carpets not intended to be washed shall be marked with the
symbol ISO 7000-3123 (2011-10) or the substance of the following:
Do not wash.
7.6 Addition:
[symbol ISO 7000-3114 (2011-10)] Do not dry clean

[symbol ISO 7000-3123 (2011-10)] Do not wash

[symbol ISO 7000-3124 (2011-10)] Do not bleach

7.12 Addition:
The instructions shall contain the substance of the following:
This appliance is for indoor use only.
For heated carpets that incorporate a wear indicator such as a colour change, the instructions
shall clearly explain the purpose of the indicator and the action to be taken when it becomes
visible.
The instructions for portable heated carpets shall contain the substance of the following:
Portable heated carpets should not be used if there are signs of damage.
Portable heated carpets should not be used for warming animals.
The instructions for portable heated carpets shall give details regarding laundering or
cleaning. If symbol ISO 7000-3114 (2011-10), symbol ISO 7000-3123 (2011-10) or symbol
ISO 7000-3124 (2011-10) are used, their meaning shall be explained.
The instructions for portable heated carpets shall state that the appliance shall be repaired or
replaced if the cover is worn. They shall explain how such wear can be observed.
Modification:
The instructions concerning persons (including children) with reduced physical, sensory or
mental capabilities or lack of experience and knowledge and children playing with the appliance
are not required.
7.12.1 Addition:
Instructions shall include the following:
– explanation of the markings, if necessary;
– a statement that heating units have to be separated from other heat sources;
– a statement that the heating unit is not to be installed on irregular surfaces;
– a statement that the heating unit is to be installed with the correct orientation if applicable;
– a statement that the installation is to be in accordance with the national wiring rules; and
– a recommendation that the heating units are to be supplied through a residual current
device (RCD) having a rated residual operating current not exceeding 30 mA.
Instructions shall include the following information for installing the heating units:
– precautions to be taken to avoid damage during installation;
– dimensions and distances to be taken into account;
– description of the fixing areas of the heating unit;
– guidance on how to avoid damage to a heating unit and its terminations due to relative
movement after installation;
– the lowest ambient temperature at which heating units may be installed;
– the minimum radius for bending the heating element, if applicable;
– precautions to be taken to avoid creasing the heating element;
– how to interconnect heating units, giving the cross-sectional area of the leads and type of
leads, if applicable;
– the maximum current allowed to flow through one heating unit when other heating units
are supplied through it or when the current can vary depending on its length;
– list of controls that are necessary to ensure compliance with the standard including the
statement that the appliance must only be used in conjunction with these controls as they
form part of the overheating protection system, unless they are incorporated into the
heating unit; and
– specification of any adhesive to be used.
7.12.101 The instructions for heating units that can be cut to measure shall state that the
installation work is only to be carried out by the manufacturer or its service agent in order to
avoid a hazard.
7.14 Addition:
The height of the lettering on the flexible part of the portable heated carpets shall be at least
2,5 mm.
The height of the symbols shown in the Addition to 7.6 shall be at least 5 mm.
The height of the lettering of the marking for heating units intended to be installed only above
a floor of concrete or similar material shall be at least 20 mm.
7.15 Addition:
The marking for heating units intended to be installed only above a floor of concrete or similar
material shall be visible during installation.
7.101 A label that contains sufficient space for the locations of the heating units to be listed
shall be provided for each installation giving:
– the name, trade mark or identification mark of the manufacturer or responsible vendor;
– the model or type reference;
– rated power input; and
– where the heating units are installed.
It shall state the substance of the following:
– do not restrict the thermal emission of the heated floor;
– do not use fixing materials other than those recommended;
– do not insert nails or screws;
– this label is to be fixed adjacent to the distribution board.
Compliance is checked by inspection.
8 Protection against access to live parts
This clause of Part 1 is applicable except as follows.
8.1.1 Addition:
For parts of appliances situated not more than 850 mm above the floor after installation or in
normal use, in addition to the use of test probe 18, test probe 19 of IEC 61032 is also applied
wherever test probe 18 is used and with the same test conditions used for test probe 18.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Modification:
The requirement also applies to the rated power input per metre length of heating elements of
the heating units.
10.101 The power input of appliances having heating units incorporating PTC heating
elements shall significantly decrease with an increase in temperature.
Compliance is checked by the following test.
The appliance is supplied at rated voltage and operated under normal operation. The power
input shall have decreased by at least 50 % from the initial value when steady conditions are
established, any control operating during this period being short-circuited.
11 Heating
This clause of Part 1 is applicable except as follows.
11.1 Addition:
The tests are carried out in a room that is maintained at an ambient temperature of 20 °C ± 2 °C.
11.2 Replacement:
Heating units intended to be installed only above a floor of concrete or similar material are
positioned in accordance with 11.2.103. Other heating units and heated carpets are installed
on top of the floor and are positioned in accordance with 11.2.102.
If a modular heating unit is provided with a thermostat having a separate floor sensor, the
sensor is located on one of the adjacent heating units
– on the centreline, or
– as per manufacturer's instructions,
but 300 mm ± 50 mm outside the area of the thermal insulation and at least 300 mm from the
edges of the test floor.
For other heating units provided with a thermostat having a separate floor sensor, the sensor
is located on
– the centreline of the heating unit, or
– as per manufacturer's instructions,
but 300 mm ± 50 mm outside the area of the thermal insulation and at least 300 mm from the
edges of the test floor.
11.2.101 Multiple heating units are installed in accordance with the instructions for
installation. They are arranged in a matrix, the heating unit under test being located in the
centre.
11.2.102 The appliance is placed on the test floor as shown in Figure 101 and a layer of
thermal insulation having a thermal resistance of approximately 5 m · K/W is placed beneath
the surface of the test floor.
The test floor has a free space of at least 1,5 m above its upper surface.
A piece of thermal blocking insulation having a thermal resistance of approximately
1,25 m · K/W is placed on the floor centrally across the heating units, as shown in Figure 101.
The insulation has a length of 0,8 m and a width
– of 0,8 m, for heated carpets;
– equal to that of the heating unit, for heating units.
NOTE In order to measure the highest temperature rise of the floor, it can be necessary to repeat the test with the
covering material having the minimum thickness specified in the instructions.
11.2.103 Heating units intended to be installed only above a floor of concrete or similar
material are placed on a test floor as shown in Figure 102. Thermal insulation having a thermal
resistance of approximately 2,5 m · K/W is located under the heating units. A layer of concrete
at least 40 mm thick supports the thermal insulation. Instead of pouring concrete, the concrete
layer may consist of concrete slabs 40 mm thick and having dimensions at least
500 mm × 500 mm, the gaps between the slabs being filled with dry sand.
The test floor has a free space of at least 1,5 m above its upper surface.
A piece of thermal blocking insulation having a thermal resistance of approximately
1,25 m · K/W is placed on the floor centrally across the heating units, as shown in Figure 102.
The insulation has a length of 0,8 m and a width equal to that of the heating unit.
11.3 Addition:
The temperature on top of the simulated carpet is measured by thermocouples attached to the
back of a blackened plate of copper or brass, 65 mm × 65 mm × 0,5 mm.
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 109 is used to measure the temperature rises of external accessible surfaces
specified in Table 102. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.4 Addition:
Controlled appliances are operated under normal operation and supplied with the most
unfavourable voltage between 0,94 times and 1,06 times the rated voltage.
11.7 Replacement Modification:
Replace the first paragraph with the following:
Appliances are operated until steady conditions are established.
11.8 Modification:
Replace the first paragraph with the following:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 102.
Table 102 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions
a
Surface
Temperature rise of external accessible surfaces
K
Surfaces of appliances Surfaces of appliances
situated not more than situated more than
850 mm above the floor 850 mm above the floor
after installation after installation
Bare metal 38 42
b
42 49
Coated metal
Glass and ceramic 51 56
c d
58 62
Plastic and plastic coating > 0,4 mm ,
NOTE The temperature rise limits of handles, knobs, grips, keyboards, keypads and similar parts are specified in
Table 3.
a
Temperature rises are not measured on parts of the appliance in contact with the surfaces measured in Table
101.
b
Metal is considered coated when a coating having a minimum thickness of 90 μm made of enamel, powder or
non-substantially plastic coating is used.
c
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
d
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
ceramic material apply.
Addition:
nd shall not exceed
Temperature rises are also measured at the points indicated in Table 101 a
the values specified. The temperature rises at points away from the thermal blocking insulation
shall be measured at least 100 mm from the edges of the thermal blocking insulation.
Table 101 – Maximum temperature rises
Part Temperature rise
K
Top surface of the 0,1 m · K/W thermal insulation layer or heated carpet
22 (60)
Wood of the test framework
60 (60)
NOTE The temperature rise limits under the thermal blocking insulation are in brackets.

For portable heated carpets, when polyvinyl chloride is used for insulating heating elements,
the temperature rise of the insulation shall not exceed 80 K.
12 Charging of metal-ion batteries
This clause of Part 1 is not applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.1 Addition:
Appliances are installed as specified in 11.2.
Two sheets of metal foil of sufficient size to cover the heated area are inserted, one above the
0,1 m · K/W thermal insulation layer or heated carpet and one below the appliance, these
sheets being electrically connected together. A uniformly distributed load of approximately
2 2
35 kg/m is placed on the top of the 0,1 m · K/W thermal insulation layer.
The arrangement is shown in Figure 103.
13.2 Addition:
The leakage current is measured between any pole of the supply and the sheets of metal foil.
Screens and other earthing means are disconnected from earth.
Instead of the values specified, the leakage current shall not exceed 1 mA/m .
NOTE 101 If the total leakage current is above 10 mA, special installation in accordance with national wiring rules
can be required.
NOTE 102 The major part of the leakage current with these appliances is usually capacitive leakage.
13.3 Modification:
For the flexible part, the test voltage is applied between live parts and the metal foil.
14 Transient overvoltages
This clause of Part 1 is applicable.
...

IEC 60335-2-106 ®
Edition 2.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-106: Exigences particulières pour les tapis chauffants et
les unités chauffantes installées sous des revêtements de sol amovibles, pour
le chauffage des locaux
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IEC 60335-2-106 ®
Edition 2.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-106: Exigences particulières pour les tapis chauffants et

les unités chauffantes installées sous des revêtements de sol amovibles, pour

le chauffage des locaux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.120; 97.100.10 ISBN 978-2-8322-1043-6

– 2 – IEC 60335-2-106:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 10
6 Classification . 11
7 Marking and instructions . 11
8 Protection against access to live parts . 14
9 Starting of motor-operated appliances . 14
10 Power input and current . 14
11 Heating . 15
12 Charging of metal-ion batteries . 16
13 Leakage current and electric strength at operating temperature . 16
14 Transient overvoltages . 17
15 Moisture resistance . 17
16 Leakage current and electric strength . 18
17 Overload protection of transformers and associated circuits . 18
18 Endurance . 18
19 Abnormal operation . 21
20 Stability and mechanical hazards . 23
21 Mechanical strength . 23
22 Construction . 27
23 Internal wiring . 29
24 Components . 29
25 Supply connection and external flexible cords . 29
26 Terminals for external conductors . 30
27 Provision for earthing . 30
28 Screws and connections . 30
29 Clearances, creepage distances and solid insulation . 30
30 Resistance to heat and fire . 31
31 Resistance to rusting . 33
32 Radiation, toxicity and similar hazards . 33
Annexes . 42
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 43
Bibliography . 44

Figure 101 – Arrangement for testing heating units . 34
Figure 102 – Arrangement for testing heating units to be used only above concrete or
similar floors . 35

Figure 103 – Arrangement for measuring leakage current and electric strength of the
flexible part . 36
Figure 104 – Jig for locating the contact needle . 37
Figure 105 – Arrangement for the three-thickness fold test . 38
Figure 106 – Equipment for flexing heating elements and internal wiring . 39
Figure 107 – Equipment for the spark ignition test . 40
Figure 108 – Details of the mask . 41

Table 101 – Maximum temperature rises . 16

– 4 – IEC 60335-2-106:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

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.
IEC 60335-2-106 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1, 5.2, 5.3, 5.6, 7.12.1, 7.101,
10.1, 18.101.1, 18.101.2, 18.102.5, 19.1, 19.103, 21.1, 21.104, 21.105, 30.102);
c) requirements for portable heated carpets have been added (Clause 1, 5.2, 5.5, 6.1, 6.2, 7.1,
7.6, 7.12, 7.14, 7.101, 11.8, 15.1, 15.101, 16.1, 16.2, 16.3, 19.101, 19.102. 19.103, 21.105,
21.106, 24.1.5, 24.2, 29.3);
d) requirements for washable portable heated carpets have been added (5.3, 7.1, 7.6, 7.12,
7.14);
e) the test of 30.102 has been updated.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6369/FDIS 61/6419/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for heated carpets and for
heating units for room heating installed under removable floor coverings.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification", or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.

– 6 – IEC 60335-2-106:2021 © IEC 2021
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• 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 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 publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class III heating units only are allowed (Finland).

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

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-106:2021 © IEC 2021
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

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of
– portable heated carpets;
– heated carpets and similar appliances;
– heating units to heat the room in which they are located and that are intended to be installed
directly under materials used as a removable floor covering such as carpet, cushion vinyl,
or loose laid laminate,
their rated voltage being not more than 250 V for single-phase installations and 480 V for other
installations, including direct current (DC) supplied appliances.
Attention is drawn to the fact that
– in many countries different wiring rules apply;
– for appliances intended to be used in vehicles or on board ships or aircraft, additional
requirements can be necessary;
– in many countries additional requirements are specified by the national authorities for fire
protection, the national authorities for building regulations, the national health authorities,
the national authorities responsible for the protection of labour and similar authorities.
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);
– heated mats and foot warmers with an area not exceeding 0,5 m (IEC 60335-2-81);
– flexible sheet heating systems permanently incorporated in the floor of the building structure
(IEC 60335-2-96);
– flexible heating elements incorporated in other appliances;
– battery-operated appliances.

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60884-1:2002, Plugs and socket-outlets for household and similar purposes – Part 1:
General requirements
IEC 60884-1:2002/AMD1:2006
IEC 60884-1:2002/AMD2:2013
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.9 Replacement:
operation of the appliance under the following conditions:
heating units are installed under a layer of material having a thermal resistance of
approximately 0,1 m · K/W. Heating units, the current of which can vary depending on the
length of the heating element, and those that can supply other heating units are loaded so that
the current marked on the heating element flows through the heating unit.
3.5 Definitions relating to types of appliances
3.5.101
heating unit
heating element equipped with means for connection to the supply
3.5.102
modular heating unit
prefabricated assembly consisting of a heating unit and other materials
3.5.103
controlled appliance
appliance incorporating means in the flexible part for sensing the changes in temperature when
the appliance is operated under normal operation, thus automatically controlling the average
power input
3.5.104
heated carpet
appliance having an area exceeding 0,5 m on which the user's feet or body are placed in order
to warm them
3.6 Definitions relating to parts of an appliance
3.6.101
electrode
conductive part incorporated in a flexible sheet heating element for supplying the heating
material
___________
There exists a consolidated edition 3.2:2013 that includes edition 3 and its Amendment 1 and Amendment 2.

– 10 – IEC 60335-2-106:2021 © IEC 2021
3.6.102
flexible part
all layers of material forming the permanent enclosure of the appliance together with the heating
element, thermostats and all other current-carrying parts contained within it, which are
intended to be under or part of the floor covering
Note 1 to entry: The flexible part may be provided with a detachable cover.
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.2 Addition:
For laminated heated carpets, an additional appliance is required for the tests of 22.103.
For heating units, two additional appliances are required for the test of 18.102. For heating
units with deposited film or printed circuit heating elements, two additional appliances are
required for the test of 21.102.
For heated carpets that incorporate a wear indicator, such as a colour change, special samples
with the textile layer worn or removed to expose the indicator are required for the tests of
Clauses 11, 13, 18 and Subclauses 19.2, 19.101, 21.101, 21.102, 21.103 and 21.104.
The tests of 21.101 and 21.104 may be carried out on separate appliances.
A 15 m length of heating element or internal wiring is required for the tests of 21.105.
5.3 Addition:
The test of 21.101 may be carried out in conjunction with the conditioning in 18.102.2.
Washable portable heated carpets are laundered twice in accordance with the instructions
before testing is started.
5.5 Addition:
If portable heated carpets are provided with a detachable cover, tests are carried out with or
without this cover, whichever is the most unfavourable.
5.6 Addition:
Thermostats sensitive to room air temperature or outdoor air temperature are short circuited.
However, the thermostat is not short circuited if it can be set so that it does not cycle.
For electronic controls, it may be necessary to render the sensing elements inoperative instead
of short circuiting the thermostat.

5.10 Addition:
For heating units that are cut to measure, the tests are carried out after connecting the supply
leads and protecting the edges in accordance with the instructions.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Addition:
If a heating unit is classified, the relevant requirements apply.
Portable heated carpets shall be class II or III.
6.2 Addition:
Heating units and other floor mounted parts shall be at least IPX7.
Heated carpets, other than portable heated carpets, and similar appliances shall be IPX7.
This requirement does not apply to the plug for appliances connected via a supply cord fitted
with a plug or to wall-mounted controls.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Modification:
Instead of the marking of rated power input or rated current, the following applies:
Heating units shall be marked with their rated power input and the maximum rated current
at 20 ºC. Heating units that can be cut to measure shall be marked with their rated power
input per metre length.
Heating units shall be marked with their maximum current if
– the current can vary depending on the length of the heating unit; or
– other heating units can be supplied through them.
Appliances with detachable controls shall be marked with the reference number or by other
means of identification of the control.
Addition:
Heating units shall be marked with the indication of orientation, unless they are symmetrical.
The marking shall be repeated at least once every 0,5 m of the heating element or on each
section that can be cut to form a heating unit.
Heating units that can be cut to measure and have to be cut at specified places shall be marked
appropriately.
– 12 – IEC 60335-2-106:2021 © IEC 2021
Heating units intended to be installed only above a floor of concrete or similar material shall
be permanently marked with the substance of the following:
In order to avoid a fire hazard, this heating unit is to be installed only above a floor of
concrete or similar material.
Flexible parts of the portable heated carpets shall be marked with the symbol ISO 7000-3114
(2011-10) and the symbol ISO 7000-3124 (2011-10) or the substance of the following:
Do not dry clean. Do not bleach.
In addition, portable heated carpets not intended to be washed shall be marked with the
symbol ISO 7000-3123 (2011-10) or the substance of the following:
Do not wash.
7.6 Addition:
[symbol ISO 7000-3114 (2011-10)] Do not dry clean

[symbol ISO 7000-3123 (2011-10)] Do not wash

[symbol ISO 7000-3124 (2011-10)] Do not bleach

7.12 Addition:
The instructions shall contain the substance of the following:
This appliance is for indoor use only.
For heated carpets that incorporate a wear indicator such as a colour change, the instructions
shall clearly explain the purpose of the indicator and the action to be taken when it becomes
visible.
The instructions for portable heated carpets shall contain the substance of the following:
Portable heated carpets should not be used if there are signs of damage.
Portable heated carpets should not be used for warming animals.
The instructions for portable heated carpets shall give details regarding laundering or
cleaning. If symbol ISO 7000-3114 (2011-10), symbol ISO 7000-3123 (2011-10) or symbol
ISO 7000-3124 (2011-10) are used, their meaning shall be explained.
The instructions for portable heated carpets shall state that the appliance shall be repaired or
replaced if the cover is worn. They shall explain how such wear can be observed.

Modification:
The instructions concerning persons (including children) with reduced physical, sensory or
mental capabilities or lack of experience and knowledge and children playing with the appliance
are not required.
7.12.1 Addition:
Instructions shall include the following:
– explanation of the markings, if necessary;
– a statement that heating units have to be separated from other heat sources;
– a statement that the heating unit is not to be installed on irregular surfaces;
– a statement that the heating unit is to be installed with the correct orientation if applicable;
– a statement that the installation is to be in accordance with the national wiring rules; and
– a recommendation that the heating units are to be supplied through a residual current
device (RCD) having a rated residual operating current not exceeding 30 mA.
Instructions shall include the following information for installing the heating units:
– precautions to be taken to avoid damage during installation;
– dimensions and distances to be taken into account;
– description of the fixing areas of the heating unit;
– guidance on how to avoid damage to a heating unit and its terminations due to relative
movement after installation;
– the lowest ambient temperature at which heating units may be installed;
– the minimum radius for bending the heating element, if applicable;
– precautions to be taken to avoid creasing the heating element;
– how to interconnect heating units, giving the cross-sectional area of the leads and type of
leads, if applicable;
– the maximum current allowed to flow through one heating unit when other heating units
are supplied through it or when the current can vary depending on its length;
– list of controls that are necessary to ensure compliance with the standard including the
statement that the appliance must only be used in conjunction with these controls as they
form part of the overheating protection system, unless they are incorporated into the heating
unit; and
– specification of any adhesive to be used.
7.12.101 The instructions for heating units that can be cut to measure shall state that the
installation work is only to be carried out by the manufacturer or its service agent in order to
avoid a hazard.
7.14 Addition:
The height of the lettering on the flexible part of the portable heated carpets shall be at least
2,5 mm.
The height of the symbols shown in the Addition to 7.6 shall be at least 5 mm.
The height of the lettering of the marking for heating units intended to be installed only above
a floor of concrete or similar material shall be at least 20 mm.

– 14 – IEC 60335-2-106:2021 © IEC 2021
7.15 Addition:
The marking for heating units intended to be installed only above a floor of concrete or similar
material shall be visible during installation.
7.101 A label that contains sufficient space for the locations of the heating units to be listed
shall be provided for each installation giving:
– the name, trade mark or identification mark of the manufacturer or responsible vendor;
– the model or type reference;
– rated power input; and
– where the heating units are installed.
It shall state the substance of the following:
– do not restrict the thermal emission of the heated floor;
– do not use fixing materials other than those recommended;
– do not insert nails or screws;
– this label is to be fixed adjacent to the distribution board.
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 except as follows.
10.1 Modification:
The requirement also applies to the rated power input per metre length of heating elements of
the heating units.
10.101 The power input of appliances having heating units incorporating PTC heating
elements shall significantly decrease with an increase in temperature.
Compliance is checked by the following test.
The appliance is supplied at rated voltage and operated under normal operation. The power
input shall have decreased by at least 50 % from the initial value when steady conditions are
established, any control operating during this period being short-circuited.

11 Heating
This clause of Part 1 is applicable except as follows.
11.1 Addition:
The tests are carried out in a room that is maintained at an ambient temperature of 20 °C ± 2 °C.
11.2 Replacement:
Heating units intended to be installed only above a floor of concrete or similar material are
positioned in accordance with 11.2.103. Other heating units and heated carpets are installed
on top of the floor and are positioned in accordance with 11.2.102.
If a modular heating unit is provided with a thermostat having a separate floor sensor, the
sensor is located on one of the adjacent heating units
– on the centreline, or
– as per manufacturer's instructions,
but 300 mm ± 50 mm outside the area of the thermal insulation and at least 300 mm from the
edges of the test floor.
For other heating units provided with a thermostat having a separate floor sensor, the sensor
is located on
– the centreline of the heating unit, or
– as per manufacturer's instructions,
but 300 mm ± 50 mm outside the area of the thermal insulation and at least 300 mm from the
edges of the test floor.
11.2.101 Multiple heating units are installed in accordance with the instructions for
installation. They are arranged in a matrix, the heating unit under test being located in the
centre.
11.2.102 The appliance is placed on the test floor as shown in Figure 101 and a layer of
thermal insulation having a thermal resistance of approximately 5 m · K/W is placed beneath
the surface of the test floor.
The test floor has a free space of at least 1,5 m above its upper surface.
A piece of thermal blocking insulation having a thermal resistance of approximately
1,25 m · K/W is placed on the floor centrally across the heating units, as shown in Figure 101.
The insulation has a length of 0,8 m and a width
– of 0,8 m, for heated carpets;
– equal to that of the heating unit, for heating units.
NOTE In order to measure the highest temperature rise of the floor, it can be necessary to repeat the test with the
covering material having the minimum thickness specified in the instructions.
11.2.103 Heating units intended to be installed only above a floor of concrete or similar
material are placed on a test floor as shown in Figure 102. Thermal insulation having a thermal
resistance of approximately 2,5 m · K/W is located under the heating units. A layer of concrete
at least 40 mm thick supports the thermal insulation. Instead of pouring concrete, the concrete
layer may consist of concrete slabs 40 mm thick and having dimensions at least
500 mm × 500 mm, the gaps between the slabs being filled with dry sand.

– 16 – IEC 60335-2-106:2021 © IEC 2021
The test floor has a free space of at least 1,5 m above its upper surface.
A piece of thermal blocking insulation having a thermal resistance of approximately
1,25 m · K/W is placed on the floor centrally across the heating units, as shown in Figure 102.
The insulation has a length of 0,8 m and a width equal to that of the heating unit.
11.3 Addition:
The temperature on top of the simulated carpet is measured by thermocouples attached to the
back of a blackened plate of copper or brass, 65 mm × 65 mm × 0,5 mm.
11.4 Addition:
Controlled appliances are operated under normal operation and supplied with the most
unfavourable voltage between 0,94 times and 1,06 times the rated voltage.
11.7 Replacement:
Appliances are operated until steady conditions are established.
11.8 Addition:
Temperature rises are also measured at the points indicated in Table 101 and shall not exceed
the values specified. The temperature rises at points away from the thermal blocking insulation
shall be measured at least 100 mm from the edges of the thermal blocking insulation.
Table 101 – Maximum temperature rises
Part Temperature rise
K
Top surface of the 0,1 m · K/W thermal insulation layer or heated carpet
22 (60)
Wood of the test framework
60 (60)
NOTE The temperature rise limits under the thermal blocking insulation are in brackets.

For portable heated carpets, when polyvinyl chloride is used for insulating heating elements,
the temperature rise of the insulation shall not exceed 80 K.
12 Charging of metal-ion batteries
This clause of Part 1 is not applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.1 Addition:
Appliances are installed as specified in 11.2.

Two sheets of metal foil of sufficient size to cover the heated area are inserted, one above the
0,1 m · K/W thermal insulation layer or heated carpet and one below the appliance, these
sheets being electrically connected together. A uniformly distributed load of approximately
2 2
35 kg/m is placed on the top of the 0,1 m · K/W thermal insulation layer.
The arrangement is shown in Figure 103.
13.2 Addition:
The leakage current is measured between any pole of the supply and the sheets of metal foil.
Screens and other earthing means are disconnected from earth.
Instead of the values specified, the leakage current shall not exceed 1 mA/m .
NOTE 101 If the total leakage current is above 10 mA, special installation in accordance with national wiring rules
can be required.
NOTE 102 The major part of the leakage current with these appliances is usually capacitive leakage.
13.3 Modification:
For the flexible part, the test voltage is applied between live parts and the 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.
15.1 Addition:
The test is carried out directly on a heating unit.
Portable heated carpets are also subjected to the test of 15.101.
15.1.1 Addition:
IPX7 heating units are immersed for 72 h.
15.101 Addition:
The flexible part of the portable heated carpet is immersed for 1 h in water containing
approximately 1 % NaCI at a temperature of 20 °C ± 5 °C after removing detacha
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