Household and similar electrical appliances - Safety - Part 2-35: Particular requirements for instantaneous water heaters

IEC 60335-2-35:2012 deals with the safety of electric instantaneous water heaters for household and similar purposes and intended for heating water below boiling temperature, their rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances. Instantaneous water heaters incorporating bare heating elements are within the scope of this standard. 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 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 or children playing with the appliance. This fifth edition cancels and replaces the fourth edition published in 2002, including its Amendment 1 (2006) and its Amendment 2 (2009). The principal changes in this edition as compared with the fourth edition of IEC 60335-2-31 are as follows:
- converted notes to normative text (7.12, 7.102, 8.1.5, 22.104, and 22.109.3);
- deleted notes in 19.13, 22.109, and A.101;
- added Annex R and 22.108 for appliances with programmable electronic circuits and added requirements for water heaters (22.50, 22.51). 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. Keywords: Water heater, Instantaneous, open-outlet, bare-element.
This publication is to be read in conjunction with IEC 60335-1:2010.

Appareils électrodomestiques et analogues - Sécurité - Partie 2-35: Exigences particulières pour les chauffe-eau instantanés

La CEI 60335-2-35:2012 traite de la sécurité des chauffe-eau électriques instantanés pour usages domestiques et analogues, destinés à chauffer l'eau au-dessous de la température d'ébullition, et dont la tension assignée n'est pas supérieure à 250 V pour les appareils monophasés et à 480 V pour les autres appareils. Les chauffe-eau instantanés comportant des éléments chauffants nus sont compris dans le domaine d'application de la présente norme. Les appareils non destinés à un usage domestique normal mais qui peuvent néanmoins constituer une source de danger pour le public, tels que les appareils destinés à être utilisés dans les magasins, chez les artisans et dans les fermes, sont compris dans le domaine d'application de la présente norme. Dans la mesure du possible, la présente norme traite des risques ordinaires présentés par les appareils qui sont encourus par tous les individus à l'intérieur et autour de l'habitation. Cependant, cette norme ne tient pas compte en général des personnes (y compris des enfants) dont les capacités physiques, sensorielles ou mentales; ou le manque d'expérience et de connaissance les empêchent d'utiliser l'appareil en toute sécurité sans surveillance ou instruction; de l'utilisation de l'appareil comme jouet par des enfants. Cette cinquième édition annule et remplace la quatrième édition publiée en 2002, son Amendement 1 (2006) et son Amendement 2 (2009). Par rapport à la quatrième édition de la CEI 60335-2-35, les principales modifications indiquées ci-après ont été apportées dans la présente édition (les modifications mineures ne sont pas mentionnées):
- transposition de certaines notes en texte normatif (7.12, 7.102, 8.1.5, 22.104 et 22.109.3);
- suppression de certaines notes en 19.13, 22.109 et en A.101;
- ajout de l'Annexe R et de 22.108 pour les appareils équipés de circuits électroniques programmables;
- ajout d'exigences pour les chauffe-eau (22.50, 22.51). L'attention des Comités Nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication CEI, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de cette publication soit entériné au niveau national au plus tôt 12 mois et au plus tard 36 mois après la date de publication. Mots-clés: chauffe-eau, instantané, écoulement libre, éléments nus
Cette publication doit être lue conjointement avec la CEI 60335-1:2010.

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Publication Date
06-Nov-2012
Current Stage
PPUB - Publication issued
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07-Nov-2012
Completion Date
07-Nov-2012
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IEC 60335-2-35
Edition 5.0 2012-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-35: Particular requirements for instantaneous water heaters
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-35: Exigences particulières pour les chauffe-eau instantanés
IEC 60335-2-35:2012
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 60335-2-35
Edition 5.0 2012-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-35: Particular requirements for instantaneous water heaters
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-35: Exigences particulières pour les chauffe-eau instantanés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 13.120; 97.040.50 ISBN 978-2-83220-455-9

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
---------------------- Page: 3 ----------------------
– 2 – 60335-2-35 © IEC:2012
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 7

1 Scope ............................................................................................................................... 8

2 Normative references ....................................................................................................... 8

3 Terms and definitions ....................................................................................................... 9

4 General requirement ......................................................................................................... 9

5 General conditions for the tests ........................................................................................ 9

6 Classification .................................................................................................................. 10

7 Marking and instructions ................................................................................................. 10

8 Protection against access to live parts ............................................................................ 11

9 Starting of motor-operated appliances ............................................................................ 12

10 Power input and current.................................................................................................. 12

11 Heating........................................................................................................................... 12

12 Void ................................................................................................................................ 12

13 Leakage current and electric strength at operating temperature ...................................... 12

14 Transient overvoltages ................................................................................................... 12

15 Moisture resistance ........................................................................................................ 12

16 Leakage current and electric strength ............................................................................. 13

17 Overload protection of transformers and associated circuits ........................................... 13

18 Endurance ...................................................................................................................... 13

19 Abnormal operation ........................................................................................................ 13

20 Stability and mechanical hazards.................................................................................... 14

21 Mechanical strength ....................................................................................................... 14

22 Construction ................................................................................................................... 14

23 Internal wiring ................................................................................................................. 18

24 Components ................................................................................................................... 18

25 Supply connection and external flexible cords ................................................................ 19

26 Terminals for external conductors ................................................................................... 19

27 Provision for earthing ..................................................................................................... 19

28 Screws and connections ................................................................................................. 20

29 Clearances, creepage distances and solid insulation ...................................................... 20

30 Resistance to heat and fire ............................................................................................. 20

31 Resistance to rusting ...................................................................................................... 20

32 Radiation, toxicity and similar hazards ............................................................................ 20

Annexes ............................................................................................................................... 23

Annex A (informative) Routine tests ..................................................................................... 23

Annex R (normative) Software evaluation ............................................................................ 24

Bibliography .......................................................................................................................... 25

Figure 101 – Diagram for the leakage current measurement for single-phase bare-

element water heaters .......................................................................................................... 21

---------------------- Page: 4 ----------------------
60335-2-35 © IEC:2012 – 3 –
Figure 102 – Diagram for the leakage current measurement for three-phase bare-

element water heaters .......................................................................................................... 21

Figure 103 – Diagram for the leakage current measurement for single-phase bare-

element water heaters supplied by a supply cord fitted with a plug........................................ 22

---------------------- Page: 5 ----------------------
– 4 – 60335-2-35 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-35: Particular requirements for instantaneous water 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 fifth edition cancels and replaces the fourth edition published in 2002 including its

Amendment 1 (2006) and its Amendment 2 (2009). It constitutes a technical revision.

The principal changes in this edition as compared with the fourth edition of IEC 60335-2-35

are as follows (minor changes are not listed):
– converted notes to normative text (7.12, 7.102, 8.1.5, 22.104, and 22.109.3);
– deleted notes in 19.13, 22.109, and A.101;
– added Annex R and 22.108 for appliances with programmable electronic circuits;
– added requirements for water heaters (22.50, 22.51).
---------------------- Page: 6 ----------------------
60335-2-35 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
61/4454/FDIS 61/4507/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its

amendments. It was established on the basis of the fifth edition (2010) of that standard.

NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60335-1.

This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to

convert that publication into the IEC standard: Safety requirements for instantaneous water

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 committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing

organizations 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.

A list of all parts of the IEC 60335 series, under the general title: Household and similar

electrical appliances – Safety, can be found on the IEC website.
---------------------- Page: 7 ----------------------
– 6 – 60335-2-35 © IEC:2012
The following differences exist in the countries indicated below.
– 6.1: Bare-element water heaters are not allowed (India).
– 6.1: Class 0I appliances are allowed (Japan).

– 7.1: Marking of rated pressure is different and marking of water resistivity is not required

(USA).
– 19.4: Flow switches tested for reliability are not short-circuited (USA).
– 19.13: The water temperatures are different (USA).

– 22.101: For closed water heaters, the minimum rated pressure is 1,0 MPa (Norway,

Sweden).

– 22.103: Closed water heaters have to incorporate a temperature relief valve or a combined

temperature and pressure relief valve that has to operate before the water temperature

reaches 100 °C (United Kingdom).

– 22.103: The pressure relief valve is not required to be provided with the heater (USA).

---------------------- Page: 8 ----------------------
60335-2-35 © IEC:2012 – 7 –
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.
---------------------- Page: 9 ----------------------
– 8 – 60335-2-35 © IEC:2012
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-35: Particular requirements for instantaneous water heaters
1 Scope
This clause of Part 1 is replaced by the following.

This International Standard deals with the safety of electric instantaneous water heaters for

household and similar purposes and intended for heating water below boiling temperature,

their rated voltage being not more than 250 V for single-phase appliances and 480 V for

other appliances.

NOTE 101 Instantaneous water heaters incorporating bare heating elements are within the scope of this

standard.

Appliances not intended for normal household use but which nevertheless may be a source of

danger to the public, such as appliances intended for use 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 which 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;

– in many countries regulations exist for the installation of equipment connected to the water mains.

NOTE 103 This standard does not apply to
– appliances for heating liquids (IEC 60335-2-15);
– storage water heaters (IEC 60335-2-21);
– 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);
– commercial dispensing appliances and vending machines (IEC 60335-2-75).
2 Normative references
This clause of Part 1 is applicable.
---------------------- Page: 10 ----------------------
60335-2-35 © IEC:2012 – 9 –
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.9 Replacement:
normal operation

operation of the appliance while supplied with water, the flow being adjusted to attain the

highest outlet water temperature without operation of the thermal cut-out
3.101
instantaneous water heater
stationary appliance for heating water while it flows through the appliance
Note 1 to entry: Instantaneous water heaters are referred to as water heaters.
3.102
closed water heater

instantaneous water heater intended to operate at the pressure of the water system, the

flow of water being controlled by one or more valves in the outlet system

Note 1 to entry: The operating pressure can be the output pressure of a reducing or boosting device.

3.103
open-outlet water heater

instantaneous water heater in which the flow of water is controlled by a valve in the inlet

pipe, there being no valve in the outlet pipe
3.104
bare-element water heater

instantaneous water heater in which uninsulated heating elements are immersed in the

water
3.105
rated pressure
water pressure assigned to the appliance by the manufacturer
3.106
flow switch
device that operates in response to a flow of water
3.107
pressure switch
device that operates in response to a change in pressure
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:
NOTE 101 Additional samples can be required for the tests of 22.109.
5.3 Addition:
---------------------- Page: 11 ----------------------
– 10 – 60335-2-35 © IEC:2012

When the tests are carried out on a single appliance, the tests of 22.102, 22.107, 22.108 and

24.102 are carried out before the tests of Clause 19.
5.7 Addition:
Water having a temperature of 15 °C ± 5 °C is used for the tests.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Modification:
Bare-element water heaters shall be class I or class III.
Other water heaters shall be class I, class II or class III.
6.2 Addition:
Water heaters shall be at least IPX1.

NOTE 101 Specific zones in which the water heater is installed require a higher degree of protection as specified

in IEC 60364.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:

The marked rated frequency for bare-element water heaters shall not be less than 50 Hz.

Appliances shall be marked with the rated pressure in pascals.

Bare-element water heaters shall be marked with the minimum water resistivity with which

the appliance may be used, and the marked value shall not be greater than 1 300 Ωcm.

7.12 Addition:

The instructions for open-outlet water heaters to be used with a spray head shall state that

the spray head must be descaled regularly.

The instructions for an appliance not incorporating a flow switch shall include the substance

of the following:

WARNING: Do not switch on if there is a possibility that the water in the heater is frozen.

7.12.1 Addition:

The installation instructions for open-outlet water heaters shall state that the outlet must not

be connected to any tap or fitting other than those specified.

If a pressure relief device is required for closed water heaters, the instructions shall state

that it must be fitted during installation, unless it is incorporated in the appliance.

---------------------- Page: 12 ----------------------
60335-2-35 © IEC:2012 – 11 –

The installation instructions for bare-element water heaters shall state the substance of the

following:
– the resistivity of the water supply must not be less than … Ωcm;

– the appliance must be permanently connected to fixed wiring (not necessary if it complies

with the requirements for the connection by a supply cord fitted with a plug specified

in 13.2 and 24.101);
– the appliance must be earthed (for class I appliances only).

When bare-element water heaters cannot be emptied, the installation instruction shall state

that the appliance is not to be installed in locations where freezing can occur.

In a multiple water outlet system where the water temperature can be set at each individual

water outlet, the instructions shall state the substance of the following:

The system shall be installed so that the control for setting the water temperature in

normal use installed at a shower outlet shall take priority over any other controls in the

system that set the water temperature in normal use at other water outlets.
7.15 Addition:

The additional markings for bare-element water heaters shall be visible during the

installation of the appliance.

7.101 The water inlet and water outlet shall be identified. This identification shall not be on

detachable parts. If colours are used, blue shall be used for the inlet and red for the outlet.

An alternative means of identification may be by means of arrows showing the direction of the

water flow.
Compliance is checked by inspection.

7.102 Class I bare-element water heaters shall be marked to state that the appliance must

be earthed.
Compliance is checked by inspection.

The use of a removable label or tag attached to the appliance is an acceptable means of

meeting this requirement.
8 Protection against access to live parts
This clause of Part 1 is applicable exce
...

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