IEC 60335-2-66:2002+AMD1:2008+AMD2:2011 CSV

IEC 60335-2-66
®

Edition 2.2 2012-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Household and similar electrical appliances – Safety –
Part 2-66: Particular requirements for water-bed heaters

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-66: Règles particulières pour les dispositifs de chauffage pour matelas
à eau

IEC 60335-2-66:2002+A1:2008+A2:2011

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IEC 60335-2-66

®


Edition 2.2 2012-01




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Household and similar electrical appliances – Safety –

Part 2-66: Particular requirements for water-bed heaters




Appareils électrodomestiques et analogues – Sécurité –

Partie 2-66: Règles particulières pour les dispositifs de chauffage pour matelas

à eau















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX CF


ICS 97.100.10 ISBN 978-2-88912-870-9



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60335-2-66 © IEC:2002+A1:2008
+A2:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 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 . 11
21 Mechanical strength . 11
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 13
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
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

Annexes . 16

Bibliography . 16

Figure 101 – Wood block . 15

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60335-2-66 © IEC:2002+A1:2008 – 3 –
+A2:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –

Part 2-66: Particular requirements for water-bed heaters


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 has been prepared by IEC technical committee 61:
Safety of household and similar electrical appliances.
This consolidated version of IEC 60335-2-66 consists of the second edition (2002)
[documents 61/2175/FDIS and 61/2256/RVD], its amendment 1 (2008) [documents
61/3534/FDIS and 61/3586/RVD], its amendment 2 (2011) [documents 61/4101/CDV and
61/4199/RVC] and its corrigendum of July 2004.
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.
It bears the edition number 2.2.
A vertical line in the margin shows where the base publication has been modified by
amendments 1 and 2.
The French version of this standard has not been voted upon.

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– 4 – 60335-2-66 © IEC:2002+A1:2008
+A2:2011
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 fourth edition (2001) 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 water-bed heaters.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. When this standard states “addition”, “modification” or “replacement”,
the relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The following differences exist in the countries indicated below.
– 6.1: Class I appliances are not allowed (China, Czech Republic, Norway, Slovakia
and Yugoslavia).
– 7.12.1: Additional details of the water mattress are to be stated (USA).
– 11.8: The temperature rise limit is different (USA).
– 11.101: The test is not carried out (USA).
– 21.101: The test is different (USA).
– 24.101: Self-resetting thermal cut-outs are allowed (USA).
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations 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 the amendment 1 be adopted for implementation
nationally not earlier than 12 months or later than 36 months from the date of publication.

It is the recommendation of the committee that the content of the amendment 2 be adopted for implementation
2
nationally not earlier than 12 months or later than 36 months from the date of publication.

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60335-2-66 © IEC:2002+A1:2008 – 5 –
+A2:2011
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.

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+A2:2011
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –

Part 2-66: Particular requirements for water-bed heaters



1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric water-bed heaters and their
associated control units, for household and similar purposes, their rated voltage being not
more than 250 V.
Appliances not intended for normal household use, but that nevertheless may be a source of
danger to the public, such as appliances intended to be used in hotels, 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
– persons (including children) whose
• physical, sensory or mental capabilities; or
• lack of experience and knowledge
prevents them from using the appliance safely without supervision or instruction;
– children playing with the appliance.
NOTE 101 Attention is drawn to the fact that
– for appliances intended to be used in vehicles or on board ships or in aircraft, additional requirements may be
necessary;
– in many countries additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour, the national water supply authorities and similar authorities.
NOTE 102 This standard does not apply to appliances
– for medical purposes (IEC 60601);
– intended for immersion in water during use.
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)

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60335-2-66 © IEC:2002+A1:2008 – 7 –
+A2:2011
3 Definitions
This clause of Part 1 is applicable except as follows.
3.1.9 Replacement:
normal operation
operation of the appliance after the heater has been installed under a water mattress, taking
into account the installation instructions
The appliance is supported by a wooden base that is consistent with the size of the mattress.
The top of the base consists of plywood approximately 13 mm thick and is supported 150 mm
above the floor by pinewood boards approximately 20 mm thick. The boards are assembled to
form a rectangular framework that includes a longitudinal and two transverse members to
produce six approximately equal sections.
The wooden base is completely covered by a sheet of open-cell polyether approximately
25 mm thick. The polyether has the following composition:
+2
– cell count: 18 per cm;
0
+10%
3
– specific mass: 30 kg/m
0
– hardness: 120 N to 170 N at 40 % impression, measured according to ISO 2439.
NOTE 101 This polyether sheet is omitted if the instructions state that the heater is unsuitable for use on a soft
support.
NOTE 102 Additional material is placed on the polyether sheet if this is stated in the instructions.
The heater, together with any control, is positioned on the polyether sheet. A piece of the
bottom layer of water mattress material, having dimensions 100 mm x 200 mm, is folded to
form a crease 50 mm x 200 mm. It is placed on the upper surface of the heater, parallel to the
shortest side and approximately in the centre of the longest side.
The mattress is placed over the heater, filled with water and completely covered by a similar
piece of polyether sheet approximately 36 mm thick.
3.101
water-bed heater
appliance incorporating a heating element within an enclosure and intended for use under a
water mattress
NOTE 1 The appliance may be contained in an envelope of the mattress.
NOTE 2 The appliance may incorporate a thermostat having a sensing element that has to be positioned during
installation.
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.

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+A2:2011
5.3 Addition:
The test of 21.101 is carried out immediately after the test of Clause 11.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Addition:
The rated voltage of class III appliances shall not exceed 24 V.
6.2 Addition:
Parts of the appliance, other than those of class III, that are intended to be placed under the
water mattress shall be at least IPX7.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
The appliance shall be marked with the substance of the following:
– read the instructions carefully;
– check that the heater, the mattress and any envelope are laid flat and without folds before
filling the mattress with water;
– place the heater centrally under the mattress so that it does not project from the sides of
2
the mattress enclosure;
– the support under the heater is to be flat, continuous and without sharp edges;
– use only to heat water-beds;
– this side up, if applicable;
– model or type reference of a detachable control unit, if applicable.
7.12 Addition:
The instructions shall include the substance of the following:
– the heater is only to be used with the type of detachable control unit that is marked on the
appliance, if applicable;
– the appliance is not intended for use in hospitals;
– the appliance is intended only to heat water-beds;
– sharp objects such as needles and pins must not be inserted in the appliance;
– the orientation of the plug in the socket-outlet of class II appliances provided with a metal
screen to minimize the capacitive leakage current and the electrostatic field. The means of
checking the orientation shall be given;
NOTE 101 This does not apply to appliances having a polarized plug.
– bedding is not to come into contact with the heater.

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60335-2-66 © IEC:2002+A1:2008 – 9 –
+A2:2011
7.12.1 Addition:
The installation instructions shall include the substance of the following:
– the details of the installation of the heater and its control. In particular, details shall be
given regarding the correct positioning and installation of any temperature sensing
element of the control unit, to ensure that it does not easily slip out of position;
– the minimum dimensions of the water mattress and the minimum depth of water with which
it is to be filled;
– details of any additional supporting material required if the heater is installed on a soft
support, or a statement that the heater is unsuitable for such installation.
7.101 Detachable control units shall be marked with:
– rated voltage or rated voltage range in volts;
– symbol for nature of supply, unless the rated frequency is marked;
– name, trade mark or identification mark of the manufacturer or responsible vendor;
– model or type reference;
– identification of the relevant water-bed heater.
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 Replacement:
The appliance is installed as specified for normal operation.
11.3 Addition:
The temperature rise of the surface of the water-bed heater and the surface temperature of
the mattress are determined by means of fine-wire thermocouples attached to oxidized copper
or brass plates measuring 65 mm x 65 mm x 0,5 mm.

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– 10 – 60335-2-66 © IEC:2002+A1:2008
+A2:2011
11.4 Addition:
Thermostats are short-circuited if their sensing elements are not fixed in relation to the
heater after installation.
NOTE 101 Sensing elements are not considered to be fixed if they are positioned outside the enclosure of the
heater and without provision for fixing.
11.7 Replacement:
The appliance is operated until steady conditions are established.
11.8 Addition:
The temperature rise of the surface of the water-bed heater shall not exceed 35 K except
under the folded material where the limit is 60 K.
11.101 The appliance shall operate without risk of heat-stroke to the user.
Compliance is checked by the following test.
The appliance is operated as specified in 11.1 to 11.7 except that thermostats are not short-
circuited. Controls are set in the lowest position.
The temperature of the upper surface of the water mattress shall not exceed 37 °C.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.2 Modification:
The leakage current of class II appliances provided with a metal screen connected to live
parts shall not exceed 0,25 mA when the selector switch is in one position and 0,75 mA in the
other position.
14 Transient overvoltages
This clau
...