EN 61770:2009

SLOVENSKI STANDARD
01-september-2009
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SIST EN 61770:2000
SIST EN 61770:2000/A1:2004
SIST EN 61770:2000/A2:2006
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Electric appliances connected to the water mains - Avoidance of backsiphonage and
failure of hose sets
Elektrische Geräte zum Anschluss an die Wasserversorgungsanlage - Vermeidung von
Rücksaugung und des Versagens von Schlauchsätzen
Appareils électriques raccordés au réseau d'alimentation en eau - Prescriptions pour
éviter le retour d'eau par siphonnage et la défaillance des ensembles de raccordement
Ta slovenski standard je istoveten z: EN 61770:2009
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
97.030 (OHNWULþQLDSDUDWL]DGRPQD Domestic electrical
VSORãQR appliances in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61770
NORME EUROPÉENNE
May 2009
EUROPÄISCHE NORM
ICS 91.140.60; 97.030 Supersedes EN 61770:1999 + A1:2004 + A2:2006

English version
Electric appliances connected to the water mains -
Avoidance of backsiphonage and failure of hose-sets
(IEC 61770:2008)
Appareils électriques raccordés  Elektrische Geräte zum Anschluss
au réseau d'alimentation en eau - an die Wasserversorgungsanlage -
Exigences pour éviter le retour d'eau Vermeidung von Rücksaugung
par siphonnage et la défaillance und des Versagens von Schlauchsätzen
des ensembles de raccordement (IEC 61770:2008)
(CEI 61770:2008)
This European Standard was approved by CENELEC on 2009-04-22. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61770:2009 E
Foreword
The text of document 61/3647/FDIS, future edition 2 of IEC 61770, prepared by IEC TC 61, Safety of
household and similar electrical appliances, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61770 on 2009-04-22.
This European Standard supersedes EN 61770:1999 + A1:2004 + A2:2006 + corrigendum August 2007.
The principal changes in EN 61770:2009 as compared with EN 61770:1999 are as follows (minor
changes are not listed):
– normative references are updated;
– some notes have been converted to normative text (3.10, 5.2, 6.3, 7.2 and Annex A);
– the type of petroleum spirit has been specified (9.3).
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-05-01
NOTE  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.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61770:2008 was approved by CENELEC as a European
Standard without any modification.
__________
– 3 – EN 61770:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60730-2-8 - Automatic electrical controls for household EN 60730-2-8 2002
(mod) and similar use -
Part 2-8: Particular requirements for
electrically operated water valves, including
mechanical requirements
1)
Undated reference.
2)
Valid edition at date of issue.

IEC 61770
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric appliances connected to the water mains – Avoidance of
backsiphonage and failure of hose-sets

Appareils électriques raccordés au réseau d'alimentation en eau – Exigences
pour éviter le retour d'eau par siphonnage et la défaillance des ensembles de
raccordement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 91.140.60; 97.030 ISBN 2-8318-9918-4
– 2 – 61770 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 General requirements .6
5 General conditions for the tests .7
6 Airgaps.8
7 Pipe interrupters.8
8 Dynamic backflow preventers .9
9 Hose-sets .10
Annex A (normative) Backsiphonage test.21

Figure 1 – Arrangement for the determination of "h" for pipe interrupters .
Figure 2 – Arrangement for the determination of maximum and critical water levels for
pipe interrupters .15
Figure 3 – Kinking test .16
Figure 4 – Arrangement for verifying the resistance of hose-sets to pulses .16
Figure 5 – Mandrel for testing coupling nuts .17
Figure 6 – Mandrel for ozone test on hose-sets .17
Figure 7 – Arrangement for the flexing test .18
Figure 8 – Arrangement for the bending test .19
Figure 9 – Detail for applying the bending moment to coupling tubes .19
Figure 10 – Detail for the impact test on coupling tubes .20

Table 1 – Tests applicable to different types of hoses.10

61770 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC APPLIANCES CONNECTED TO THE WATER MAINS –
AVOIDANCE OF BACKSIPHONAGE AND FAILURE OF HOSE-SETS

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.
International Standard IEC 61770 has been prepared by IEC technical committee 61: Safety
of household and similar electrical appliances.
This second edition cancels and replaces the first edition published in 1998 including its
Amendment 1 (2004) and Amendment 2 (2006). It constitutes a technical revision.
The principal changes in this edition as compared with the first edition are as follows (minor
changes are not listed):
– normative references are updated;
– some notes have been converted to normative text (3.10, 5.2, 6.3, 7.2 and Annex A);
– the type of petroleum spirit has been specified (9.3).

– 4 – 61770 © IEC:2008
The text of this standard is based on the following documents:
FDIS Report on voting
61/3647/FDIS 61/3687/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.
NOTE 1 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 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 2 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 standard be adopted for implementation
nationally not earlier than 12 months nor later than 36 months from the date of its publication.

61770 © IEC:2008 – 5 –
ELECTRIC APPLIANCES CONNECTED TO THE WATER MAINS –
AVOIDANCE OF BACKSIPHONAGE AND FAILURE OF HOSE-SETS

1 Scope
This International Standard specifies requirements for appliances for household and similar
purposes to prevent the backsiphonage of non-potable water into the water mains. It also
specifies requirements for hose-sets used for connecting such appliances to the water mains
that supply water at a pressure not exceeding 1 MPa.
NOTE 1 Examples of similar purposes are the installation of appliances in canteens, restaurants, launderettes
and communal flats.
NOTE 2 This standard does not apply to
– appliances used for dry cleaning;
– appliances for medical purposes;
– appliances intended for industrial purposes;
– water heaters that are an integral part of the water supply system;
– water coolers that are an integral part of the water supply system.
NOTE 3 The connection of the appliance to the water mains may be temporary or permanent.
NOTE 4 When reference is made to the water mains, water supplied from a cistern or similar system is also
included.
NOTE 5 Many countries have requirements concerning the prevention of contamination of potable water as a
result of contact with unsuitable materials upstream of a backflow prevention device.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60730-2-8, Automatic electrical controls for household and similar use – Part 2: Particular
requirements for electrically operated water valves, including mechanical requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
potable water
water which is obtained directly from the potable water mains and remains in a closed system
up to the backflow prevention device
3.2
non-potable water
water which leaves the closed system after having passed the backflow prevention device
3.3
backflow prevention device
means to prevent contamination of potable water by backflow of non-potable water
NOTE Examples are airgaps, dynamic backflow preventers and pipe interrupters.

– 6 – 61770 © IEC:2008
3.4
airgap
unobstructed free distance between the water inlet or the end of the feed pipe and the critical
water level
NOTE A distance is considered to be unobstructed if the airflow into the feed pipe under vacuum conditions is not
restricted by the construction of the appliance.
3.5
pipe interrupter
device without movable or elastomeric parts, into which air can enter while water is passing
through it
3.6
dynamic backflow preventer
backflow prevention device which prevents backsiphonage by the use of moving parts
3.7
overflow
means for discharging excess water from the appliance when the normal outlet is obstructed
3.8
maximum water level
highest level of the non-potable water in any part of the appliance when it operates
continuously under fault conditions
3.9
critical water level
level to which the non-potable water is reduced from the maximum water level 2 s after
water inlets have been closed
3.10
hose-set
assembly consisting of a flexible hose and couplings and used for connecting the appliance to
the water mains
NOTE Couplings may be removable with or without the aid of a tool.
3.11
detachable part
part which can be removed without the aid of a tool
4 General requirements
4.1 Appliances shall be provided with a backflow prevention device.
For appliances incorporating a water softener located upstream of an airgap or pipe interrupter,
a dynamic backflow preventer shall be incorporated upstream of the water softener.
Other components presenting a potable water hazard, such as dispensers for adding
cleaning, rinsing, softening or similar agents to the water, shall not be located upstream of the
backflow prevention device.
Pipework containing potable water located upstream of a backflow prevention device shall
not pass through non-potable water in the appliance.
Compliance is checked by inspection.

61770 © IEC:2008 – 7 –
NOTE For a given point in a hydraulic system, "upstream" indicates the side from which the water flows and
"downstream" indicates the side to which the water flows.
4.2 Backflow prevention devices shall be incorporated in, or fixed to, the appliance or they
shall be incorporated in the inlet side of a hose set.
NOTE They may also be incorporated in the water inlet valves.
They shall be constructed so that
– their functional characteristics cannot be changed, even intentionally,
– they can only be removed with the aid of a tool,
– if omitted, the appliance is rendered inoperable or manifestly incomplete.
Compliance is checked by inspection and by manual tests.
4.3 Hose-sets for the connection of appliances to the water mains shall be constructed so
that the risk of flooding is obviated as far as possible.
Compliance is checked by the tests of Clause 9.
4.4 Metallic parts of the water connection system of the appliance, the deterioration of which
may cause the appliance to fail to comply with the requirements of this standard, shall be
resistant to erosion, dezincification, oxidation or corrosion.
Compliance is checked by inspection.
1)
NOTE Resistance to dezincification of brass can be checked in accordance with ISO 6509 .
5 General conditions for the tests
5.1 When reference is made to normal conditions, the following applies:
– the appliance is placed on a horizontal support;
– the appliance is connected to a water supply in accordance with the instructions for
installation;
– the water supply has a static pressure not exc
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