SIST EN 60335-2-21:2003
(Main)Household and similar electrical appliances - Safety -- Part 2-21: Particular requirements for storage water heaters
Household and similar electrical appliances - Safety -- Part 2-21: Particular requirements for storage water heaters
Deals with the safety of electric storage 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.
Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke -- Teil 2-21: Besondere Anforderungen für Wassererwärmer (Warmwasserspeicher und Warmwasserboiler)
Appareils électrodomestiques et analogues - Sécurité -- Partie 2-21: Règles particulières pour les chauffe-eau à accumulation
Deals with the safety of electric storage 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.
Gospodinjski in podobni električni aparati - Varnost - 2-21. del: Posebne zahteve za akumulacijske grelnike vode (IEC 60335-2-21:2002, spremenjen) (vsebuje popravka AC:2007 in AC:2010)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60335-2-21:2003
01-september-2003
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SIST EN 60335-2-21:2000
SIST EN 60335-2-21:2000/A1:2001
SIST EN 60335-2-21:2000/A11:2002
SIST EN 60335-2-21:2000/A12:2003
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Household and similar electrical appliances - Safety -- Part 2-21: Particular requirements
for storage water heaters
Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke -- Teil 2-21:
Besondere Anforderungen für Wassererwärmer (Warmwasserspeicher und
Warmwasserboiler)
Appareils électrodomestiques et analogues - Sécurité -- Partie 2-21: Règles particulières
pour les chauffe-eau à accumulation
Ta slovenski standard je istoveten z: EN 60335-2-21:2003
ICS:
13.120 Varnost na domu Domestic safety
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 60335-2-21:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60335-2-21:2003
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SIST EN 60335-2-21:2003
EUROPEAN STANDARD EN 60335-2-21
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2003
ICS 91.140.65; 13.120 Supersedes EN 60335-2-21:1999 + A1:2000 + A11:2002 + A12:2002
Incorporates Corrigenda October 2007 and October 2010
English version
Household and similar electrical appliances -
Safety
Part 2-21: Particular requirements for storage water heaters
(IEC 60335-2-21:2002, modified)
Appareils électrodomestiques Sicherheit elektrischer Geräte für den
et analogues - Hausgebrauch und ähnliche Zwecke
Sécurité Teil 2-21: Besondere Anforderungen für
Partie 2-21: Règles particulières Wassererwärmer (Warmwasserspeicher
pour les chauffe-eau à accumulation und Warmwasserboiler)
(CEI 60335-2-21:2002, modifiée) (IEC 60335-2-21:2002, modifiziert)
This European Standard was approved by CENELEC on 2003-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60335-2-21:2003 E
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SIST EN 60335-2-21:2003
EN 60335-2-21:2003 - 2 -
Foreword
The text of document 61/2135/FDIS, future fifth edition of IEC 60335-2-21, prepared by the IEC Technical
Committee 61, was submitted to the IEC-CENELEC parallel vote.
As a result of the Kista meeting of CENELEC TC 61 in May 2002, a draft amendment prAA containing the
relevant existing common modifications was submitted to the formal vote.
The texts of the FDIS and the prAA were approved by CENELEC as a new edition of EN 60335-2-21 on
2003-03-01.
This European Standard replaces EN 60335-2-21:1999 + A1:2000 + A11:2002 + A12:2002.
The following dates are applicable:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-03-01
- date on which national standards
conflicting with the EN have to be withdrawn (dow) 2006-03-01
This part 2 has to be used in conjunction with EN 60335-1, Household and similar electrical appliances –
Safety – Part 1: General requirements. It was established on the basis of the 2002 edition of that standard.
Amendments and revisions of Part 1 have also to be taken into account and the dates when such
changes become applicable will be stated in the relevant amendment or revision of Part 1.
This part 2 supplements or modifies the corresponding clauses of EN 60335-1, so as to convert it into the
European Standard: Safety requirements for electric storage 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 of
Part 1 is to be adapted accordingly.
NOTE 1 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.;
- subclauses, notes and annexes that are additional to those in the IEC standard are prefixed with the letter Z.
NOTE 2 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.
Special national conditions causing a deviation from this European Standard are listed in Annex ZA and
are in addition to those in EN 60335-1.
National deviations from this European Standard are listed in Annex ZB and are in addition to those in
EN 60335-1.
p NOTE In this document, p is used in the margin to indicate instructions for preparing the printed version.
The contents of the corrigenda of October 2007 and October 2010 have been included in this copy.
_____________
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SIST EN 60335-2-21:2003
- 3 - EN 60335-2-21:2003
Introduction
p Add:
An investigation by CENELEC TC 61 has shown that all risks from products within the scope of this
standard are fully covered by the Low Voltage Directive, 73/23/EEC. For products having mechanical
moving parts, a risk assessment in accordance with the Machinery Directive, 98/37/EC, has shown that
the risks are mainly of electrical origin and consequently this directive is not applicable. However, the
relevant essential safety requirements of the Machinery Directive are covered by this standard together
with the principal objectives of the Low Voltage Directive.
____________
Endorsement notice
The text of the International Standard IEC 60335-2-21:2002 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
24 Components
p 24.102 Replace the text by:
The operating temperature of the thermal cut-out of a closed water heater shall ensure that the water
temperature cannot exceed 99 °C or the thermal cut-out operates before its temperature exceeds
110 °C.
Compliance is checked by the test of 24.102.1 for water temperatures not exceeding 99 °C or by the test
of 24.102.2 for thermal cut-outs having an operating temperature up to 110 °C.
p 24.102.2 Replace the text by:
The operating temperature of the thermal cut-out is measured by means of a thermocouple positioned
on its sensing element or as close as possible to it.
The appliance is operated under normal operation at rated power input with the outlet valve closed and
thermostats short-circuited until the thermal cut-out operates.
The thermal cut-out shall operate before its temperature exceeds 110 °C.
During the test, compliance with 19.13 shall not be impaired.
__________
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SIST EN 60335-2-21:2003
EN 60335-2-21:2003 - 4 -
p Add:
Annex ZA
(normative)
Special national conditions
Addition:
Clause Special national condition
22.101 Denmark, Finland, Norway and Sweden
For closed water heaters, the minimum rated pressure is 1,0 MPa.
22.102 Denmark (Instruction AT 2.1.2-4, 1994 and AT Instruction B.4.8)
Cold water inlets on the heated storage water heater, the safety valve and the blow out
piping shall have a clear flow diameter of at least Ø 20 mm.
Annex ZB
(informative)
A-deviations
Addition:
Clause Deviation
24.101 United Kingdom (Building Regulation Part G3)
In addition to a non-self-resetting thermal cut-out, any closed water heater having a
storage capacity in excess of 15 l shall be fitted with a temperature relief valve according
to BS 6283 Part 2 or a combined temperature and pressure relief valve according to BS 6283
Part 3.
24.102 United Kingdom (Building Regulation Part G3)
The water temperature of the stored water shall not at any time exceed 99 °C in closed water
heaters having a storage capacity in excess of 15 l.
__________
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SIST EN 60335-2-21:2003
INTERNATIONAL IEC
STANDARD
60335-2-21
Fifth edition
2002-07
Household and similar electrical appliances –
Safety –
Part 2-21:
Particular requirements for storage water heaters
Appareils électrodomestiques et analogues –
Sécurité –
Partie 2-21:
Règles particulières pour les chauffe-eau à accumulation
IEC 2002 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
S
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
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SIST EN 60335-2-21:2003
– 2 – 60335-2-21 IEC:2002(E)
CONTENTS
FOREWORD . 3
INTRODUCTION .6
1 Scope . 7
2 Normative references. 7
3 Definitions . 7
4 General requirement . 9
5 General conditions for the tests . 9
6 Classification . 9
7 Marking and instructions . 9
8 Protection against access to live parts .10
9 Starting of motor-operated appliances .10
10 Power input and current.10
11 Heating.10
12 Void .11
13 Leakage current and electric strength at operating temperature .11
14 Transient overvoltages.11
15 Moisture resistance.11
16 Leakage current and electric strength .11
17 Overload protection of transformers and associated circuits.11
18 Endurance .11
19 Abnormal operation.11
20 Stability and mechanical hazards.12
21 Mechanical strength.12
22 Construction .12
23 Internal wiring.15
24 Components .15
25 Supply connection and external flexible cords.16
26 Terminals for external conductors .16
27 Provision for earthing.16
28 Screws and connections .16
29 Clearances, creepage distances and solid insulation .16
30 Resistance to heat and fire .16
31 Resistance to rusting .16
32 Radiation, toxicity and similar hazards .17
Annexes.20
Bibliography.21
Figure 101 – Examples of types of storage water heaters.18
Figure 102 – Examples of positions of the thermocouples .19
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SIST EN 60335-2-21:2003
60335-2-21 IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––––––
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-21: Particular requirements for storage water heaters
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The 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 1997 and its
amendment 1 (1999). It constitutes a technical revision.
The text of this part of IEC 60335 is based on the following documents:
FDIS Report on voting
61/2135/FDIS 61/2160/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 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 storage water
heaters.
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SIST EN 60335-2-21:2003
– 4 – 60335-2-21 IEC:2002(E)
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
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
The following differences exist in the countries indicated below.
– 6.1: Class 0I appliances are allowed (Japan).
– 6.2: IPX0 water heaters are allowed (France, Portugal, United Kingdom and USA).
– 7.1: Additional markings are required (Australia, New Zealand and South Africa).
– 7.1: The rated pressure is to be marked in pounds per square inch (USA).
– 7.1: Open outlet water heaters are not required to be marked with rated pressure (USA).
– 7.12.1: Additional instructions are required (South Africa).
– 11.7: The test is different (USA).
– 19.1: Water heaters that have all four features and are not liable to be emptied in normal use are not subjected
to the test of 19.101 (South Africa).
– 19.1: Appliances incorporating sheathed heating elements are not required to have an outer enclosure of metal
but their rated power input is limited to 12 kW (USA).
– 19.101: The test is different (USA).
– 22.101: Pressure reducing valves have to be designed for an inlet pressure of 2 MPa (South Africa).
– 22.101: The minimum rated pressure is 1,0 MPa (Denmark, Finland, Norway and Sweden).
– 22.102: The minimum pressure is 2,1 MPa. The test is not carried out on water heaters having a capacity less
than 2 l or on appliances having containers open to the atmosphere (USA).
– 22.103: Closed water heaters have to incorporate a pressure-relief device (Norway).
– 22.103: Closed water heaters have to incorporate a pressure-relief device sensitive to both pressure and
temperature that operates before the water temperature reaches 99 °C (Australia and New Zealand).
– 22.103: Closed water heaters having a capacity exceeding 50 l or a rated power input exceeding 2 kW have to
incorporate a pressure-relief device sensitive to both pressure and temperature that operates before the water
temperature reaches 99 °C (South Africa).
– 22.103: Closed water heaters have to incorporate a temperature relief valve or a combined temperature and
pressure-relief valve that operates before the water temperature reaches 100 °C (United Kingdom).
– 22.106: All water heaters have to incorporate a thermal cut-out (India).
– 22.106: The thermal cut-out of single-phase closed water heaters need only provide single-pole disconnection (Japan).
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SIST EN 60335-2-21:2003
60335-2-21 IEC:2002(E) – 5 –
– 22.106: For all closed water heaters, the thermal cut-out is to provide all-pole disconnection (France,
Netherlands, Norway and Switzerland).
– 22.109: A tool is not required for draining the appliance (Canada and USA).
– 22.110: Additional requirements apply to plastic or resin-based containers (South Africa).
– 22.112: The temperature limit is 95 °C (South Africa).
– 22.112: The temperature limit is 85 °C (USA).
– 24.101: Thermal cut-outs are required to have a trip-free switching mechanism (USA).
– 24.102: The maximum water temperature is 90 °C (Australia and New Zealand).
– 24.102: The maximum water temperature is 99 °C (Japan, Norway, Portugal, United Kingdom and USA)
– 24.102: The temperature limit of 130 °C is only allowed for closed water heaters having a rated pressure of at
least 0,4 MPa (South Africa).
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SIST EN 60335-2-21:2003
– 6 – 60335-2-21 IEC:2002(E)
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.
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.
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.
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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SIST EN 60335-2-21:2003
60335-2-21 IEC:2002(E) – 7 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-21: Particular requirements for storage water heaters
1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of electric storage 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.
Appliances not intended for normal household use but which nevertheless may be a source of
danger to the public, such as appliances intended to be used 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
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliance by young children.
NOTE 101 Attention is drawn to the fact that
– for appliances intended to be used at high altitudes, additional requirements may be necessary;
– 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 102 This standard does not apply to
– appliances for boiling water (IEC 60335-2-15);
– instantaneous water heaters (IEC 60335-2-35);
– commercial dispensing appliances and vending machines (IEC 60335-2-75);
– 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.
3 Definitions
This clause of Part 1 is applicable except as follows.
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SIST EN 60335-2-21:2003
– 8 – 60335-2-21 IEC:2002(E)
3.1.9 Replacement:
normal operation
operation of the appliance after installation in accordance with the instructions and filled with
cold water
3.101
storage water heater
stationary appliance for heating and storing water in a container and incorporating devices
to control the water temperature
3.102
closed water heater
unvented storage 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 A closed water heater is shown in Figure 101a.
NOTE 2 The operating pressure may be the output pressure of a reducing or boosting device.
3.103
cistern-fed water heater
storage water heater that is vented to atmosphere and intended to be supplied by water
under gravity from a separate cistern, the flow of water being controlled by one or more
valves in the outlet system
NOTE 1 A cistern-fed water heater is shown in Figure 101b.
NOTE 2 The water heater may be installed so that the expanded water returns to the cistern.
NOTE 3 In a cistern-fed water heater, the pressure in the container results from the column of water in the
cistern.
3.104
cistern-type water heater
storage water heater having a container supplied by water under gravity from a cistern
incorporated in the appliance. The expanded water can return to the cistern, the flow of water
being controlled by one or more valves in the outlet system
NOTE 1 A cistern-type water heater is shown in Figure 101c.
NOTE 2 In a cistern-type water heater, the surface of the water is always at atmospheric pressure.
3.105
open-outlet water heater
storage water heater in which the flow of water is only controlled by a valve in the inlet pipe
and in which the expanded or displaced water flows through the outlet
NOTE 1 An open-outlet water heater is shown in Figure 101d.
NOTE 2 In an open-outlet water heater, the static pressure at the outlet is always at atmospheric pressure.
3.106
low-pressure water heater
storage water heater that is vented to atmosphere and intended to be connected to the water
mains through a pressure reducing valve, the flow of water being controlled by one or more
valves in the outlet system
NOTE A low-pressure water heater is shown in Figure 101e.
3.107
rated pressure
water pressure assigned to the appliance by the manufacturer
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SIST EN 60335-2
...
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