Household and similar electrical appliances - Safety - Part 2-98: Particular requirements for humidifiers

Deals with the safety of electric humidifiers for household and similar use, their rated voltage being not more than 250 V for single-phase and 480 V for other appliances. Examples of appliances that are within the scope of this standard are appliances that atomize water; appliances that evaporate water by heating and appliances that blow air through a moist element. This consolidated version consists of the second edition (2002), its amendment 1 (2004) and its amendment 2 (2008). Therefore, no need to order amendments in addition to this publication.

Appareils électrodomestiques et analogues - Sécurité - Partie 2-98: Règles particulières pour les humidificateurs

Deals with the safety of electric humidifiers for household and similar use, their rated voltage being not more than 250 V for single-phase and 480 V for other appliances. Examples of appliances that are within the scope of this standard are appliances that atomize water; appliances that evaporate water by heating and appliances that blow air through a moist element.  Cette version consolidée comprend la deuxième édition (2002), son amendement 1 (2004) et son amendement 2 (2008). Il n'est donc pas nécessaire de commander les amendements avec cette publication.

General Information

Status
Published
Publication Date
08-Sep-2008
Current Stage
PPUB - Publication issued
Start Date
09-Sep-2008
Completion Date
09-Sep-2008
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IEC 60335-2-98
Edition 2.2 2008-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-98: Règles particulières pour les humidificateurs
IEC 60335-2-98:2002+A1:2004+A2:2008
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 60335-2-98
Edition 2.2 2008-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-98: Particular requirements for humidifiers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-98: Règles particulières pour les humidificateurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 97.030 ISBN 2-8318-9949-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60335-2-98 © IEC:2002+A1:2004
+A2:2008
CONTENTS

FOREWORD...........................................................................................................................3

INTRODUCTION.....................................................................................................................5

1 Scope...............................................................................................................................6

2 Normative references.......................................................................................................6

3 Definitions........................................................................................................................7

4 General requirements .......................................................................................................7

5 General conditions for the tests ........................................................................................7

6 Classification....................................................................................................................7

7 Marking and instructions...................................................................................................7

8 Protection against access to live parts..............................................................................8

9 Starting of motor-operated appliances ..............................................................................8

10 Power input and current ...................................................................................................8

11 Heating............................................................................................................................9

12 Void ...............................................................................................................................9

13 Leakage current and electric strength at operating temperature........................................9

14 Transient overvoltages .....................................................................................................9

15 Moisture resistance........................................................................................................10

16 Leakage current and electric strength.............................................................................10

17 Overload protection of transformers and associated circuits ...........................................10

18 Endurance......................................................................................................................10

19 Abnormal operation........................................................................................................10

20 Stability and mechanical hazards ...................................................................................10

21 Mechanical strength.......................................................................................................11

22 Construction...................................................................................................................11

23 Internal wiring.................................................................................................................11

24 Components...................................................................................................................12

25 Supply connection and external flexible cords ................................................................12

26 Terminals for external conductors...................................................................................12

27 Provision for earthing .....................................................................................................12

28 Screws and connections .................................................................................................12

29 Clearances, creepage distances and solid insulation ......................................................12

30 Resistance to heat and fire.............................................................................................12

31 Resistance to rusting......................................................................................................12

32 Radiation, toxicity and similar hazards............................................................................12

Annexes ...............................................................................................................................

Bibliography..........................................................................................................................

---------------------- Page: 4 ----------------------
60335-2-98 © IEC:2002+A1:2004 – 3 –
+A2:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 60335-2-98 consists of the second edition (2002)

[documents 61/2231/FDIS and 61/2306/RVD], its amendment 1 (2004) [documents

61/2746/FDIS and 61/2797/RVD] and its amendment 2 (2008) [documents 61/3645/FDIS and

61/3685/RVD].

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.
---------------------- Page: 5 ----------------------
– 4 – 60335-2-98 © IEC:2002+A1:2004
+A2:2008

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 humidifiers.

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.

– Clause 1: Electrode-type appliances and appliances with bare-heating elements are only allowed if they are

for permanent connection to fixed wiring (Netherlands).
– 7.12.1: The minimum rated pressure is 1,0 MPa (Denmark, Sweden and Norway).
– 24.101: The requirement is not applicable (USA).

The committee has decided that the contents of the base publication and its amendments will

remain unchanged until the maintenance result 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 2 be adopted for implementation

nationally not earlier than 12 months or later than 36 months from the date of publication.

---------------------- Page: 6 ----------------------
60335-2-98 © IEC:2002+A1:2004 – 5 –
+A2:2008
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.

2 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.
---------------------- Page: 7 ----------------------
– 6 – 60335-2-98 © IEC:2002+A1:2004
+A2:2008
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-98: Particular requirements for humidifiers
1 Scope
This clause of Part 1 is replaced by the following.

This International Standard deals with the safety of electric humidifiers for household and

similar use, their rated voltage being not more than 250 V for single-phase appliances and

480 V for other appliances.
NOTE 101 Examples of appliances that are within the scope of the standard are
– appliances that atomize water;
– appliances that evaporate water by heating;
– appliances that blow air through a moist element.

Appliances that are 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 by laymen in shops, in

light industry and on farms, 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 102 Attention is drawn to the fact that

– for appliances intended to be used in vehicles or on board ships or 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 and similar authorities.
NOTE 103 This standard does not apply to
– appliances for heating liquids (IEC 60335-2-15);

– humidifiers intended for use with heating, ventilation or air-conditioning systems (IEC 60335-2-88);

– appliances for medical purposes (IEC 60601);
– 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).
2 Normative references
This clause of Part 1 is applicable.
---------------------- Page: 8 ----------------------
60335-2-98 © IEC:2002+A1:2004 – 7 –
+A2:2008
3 Definitions
This clause of Part 1 is applicable except as follows.
3.1.6 Addition:

NOTE 101 For electrode-type appliances, if no current is assigned to the appliance, the rated current is

calculated from the rated voltage and the mean value of the power input during the first 2 min of operation, the

appliance being supplied at rated voltage and operated under normal operation.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions

The appliance is filled with the maximum quantity of water in accordance with the instructions,

unless the appliance is connected to the water mains and the supply is automatically

controlled.

For electrode-type appliances, the water has a resistivity of approximately 500 Ω

cm at a
temperature of 20 C.

NOTE 101 The appropriate resistivity may be obtained by adding sodium chloride to the water.

3.101
electrode-type appliance
appliance in which a conductive liquid is heated by a current flowing through it
4 General requirements
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.6 Addition:
Humidistats are short-circuited or rendered inoperative.
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 Modification:
Electrode-type appliances shall be marked with their rated power input.
---------------------- Page: 9 ----------------------
– 8 – 60335-2-98 © IEC:2002+A1:2004
+A2:2008
Addition:

Appliances that are manually filled shall have a level mark or other means to indicate when

they are filled to their rated capacity, unless they cannot be filled beyond this capacity. This

indication shall be visible when the appliance is being filled.

2 If the temperature of the water vapour exceeds 60 °C, the appliance shall be marked with

symbol IEC 60417-5597 (2002-10) or with the substance of the following:
CAUTION: Hot water vapour
NOTE 101 This symbol is a warning sign and the rules of ISO 3864-1 apply.
7.6 Addition:
[symbol IEC 60417-5597 (2002-10)] steam
7.12 Addition:

The instructions shall include details regarding filling, cleaning and descaling.

The instructions shall state the substance of the following:

– care should be taken when using the appliance due to the emission of hot water vapour;

– unplug the appliance during filling and cleaning.

The instructions for electrode-type appliances shall include the substance of the following:

– the composition and quantity of solution to be used and advice not to use an excessive

amount of salt;
– the appliance is not to be operated from a d.c. supply.
2 If symbol IEC 60417-5597 (2002-10) is used, its meaning shall be explained.
7.12.1 Addition:

The installation instructions for appliances intended to be connected to the water mains shall

state the maximum permissible water pressure in pascals.
2 7.15 Addition:

Symbol IEC 60417-5597 (2002-10) or the marking relating to hot water vapour shall be near

the vapour outlet.
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.
---------------------- Page: 10 ----------------------
60335-2-98 © IEC:2002+A1:2004 – 9 –
+A2:2008
10.1 Addition:
For electrode-type appliances, the negative deviation is not limited.
11 Heating
This clause of Part 1 is applicable except as follows.
11.4 Modification:
Electrode-type appliances are supplied at 1,06 times rated voltage.
Addition:

If the temperature rise limits are exceeded in appliances incorporating motors, transformers or

electronic circuits, and the power input is lower than the rated power input, the test is

repeated with the appliance supplied at 1,06 times rated voltage.
11.6 Replacement:
Combined appliances are operated as heating appliances.
11.7 Replacement:
Appliances are operated until steady conditions are established.
11.8 Addition:

The temperature rise limits of motors, transformers and components of electronic circuits,

including parts directly influenced by them, may be exceeded when the appliance is operated

at 1,15 times rated power input.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.1 Modification:
Electrode-type appliances are supplied at 1,06 times rated voltage.
13.2 Addition:

For electrode-type appliances, the leakage current is measured between a metallic mesh

placed in the water vapour, 10 mm from the outlet, and accessible metal parts including the

metal foil.
The leakage current shall not exceed 0,25 mA.
14 Transient overvoltages
This clause of Part 1 is applicable.
---------------------- Page: 11 ----------------------
– 10 – 60335-2-98 © IEC:2002+A1:2004
+A2:2008
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.2 Addition:

In case of doubt, the spillage test is carried out with the appliance deviating from the normal

position of use by an angle not exceeding 5°.

Appliances intended to be connected to the water mains are operated until the maximum

water level is reached. The inlet valve is held open and the filling continued for 15 min after

the first evidence of overflow or until the inflow stops automatically.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.
19 Abnormal operation
This clause of Part 1 is applicable except as follows.
19.2 Addition:

The container of electrode-type appliances is filled with a saturated solution of NaCl

at 20 °C ± 5 °C, the appliance being supplied at rated voltage.
NOTE 101 A solution is saturated when no more salt can be dissolved.
19.3 Addition:
The test is not applicable to electrode-type appliances.
19.4 Modification:
Appliances are only filled with sufficient water to cover the heating elements.
Fans are switched off.
20 Stability and mechanical hazards
This clause of Part 1 is applicable.
---------------------- Page: 12 ----------------------
60335-2-98 © IEC:2002+A1:2004 – 11 –
+A2:2008
21 Mechanical strength
This clause of Part 1 is applicable.
22 Construction
This clause of Part 1 is applicable except as follows.
22.6 Addition:

Drain holes shall be at least 5 mm in diameter or 20 mm in area with a minimum dimension of

at least 3 mm.
Compliance is checked by measurement.
22.33 Modification:

Liquids may be heated using electrodes and may be in direct contact with their live parts.

22.101 The vapour outlet of appliances incorporating means for heating water shall be free

from obstructions that could give rise to a significant pressure within the container. The

container shall be vented to the atmosphere, the aperture being at least 5 mm in diameter or

20 mm in area with a minimum dimension of at least 3 mm.
Compliance is checked by inspection and by measurement.

22.102 Appliances for wall mounting shall have reliable provision for fixing to a wall,

independent of the connection to the water mains.
Compliance is checked by inspection.

22.103 Electrode-type appliances shall be constructed to ensure that when the filling

aperture of the container is open, both electrodes are disconnected to provide all-pole

disconnection under overvoltage category III conditions.
...

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