IEC 61770:2008

Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets

IEC 61770:2008 provides 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. The major changes in this edition as compared with the first edition are as follows: 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).

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

La CEI 61770:2008 spécifie les exigences pour les appareils à usages domestiques et analogues pour éviter un retour d'eau non potable par siphonnage dans le réseau d'alimentation en eau. Elle spécifie également les exigences pour les ensembles de raccordement utilisés pour raccorder de tels appareils aux réseaux d'alimentation dont la pression ne dépasse pas 1 MPa. Cette édition inclut les modifications techniques majeures suivantes par rapport à l édition précédente: mise à jour des références normatives; transformation de certaines notes en exigences (3.10, 5.2, 6.3, 7.2 et Annexe A); le type d essence a été spécifié (9.3).

General Information

• Status: Published
• Publication Date: 22-Jul-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 91.140.60 - Water supply systems
• ICS: 97.030 - Domestic electrical appliances in general
• Technical Committee: TC 61 - Safety of household and similar electrical appliances
• Drafting Committee: MT 37 - TC 61/MT 37
• Current Stage: PPUB - Publication issued
• Start Date: 15-Aug-2008
• Completion Date: 23-Jul-2008

Relations

• Amended By: IEC 61770:2008/AMD1:2015 - Amendment 1 - Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
• Effective Date: 05-Sep-2023
• Revises: IEC 61770:1998 - Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
• Effective Date: 05-Sep-2023
• Revises: IEC 61770:1998/AMD1:2004 - Amendment 1 - Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
• Effective Date: 05-Sep-2023
• Revises: IEC 61770:1998/AMD2:2006 - Amendment 2 - Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, 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 either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
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International Standards for all electrical, electronic and related technologies.

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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 integ
...

IEC 61770 ®
Edition 2.1 2015-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
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Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

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IEC 61770 ®
Edition 2.1 2015-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
INTERNATIONALE
ICS 91.140.60, 97.030 ISBN 978-2-8322-2967-5

IEC 61770 ®
Edition 2.1 2015-10
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
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
– 2 – IEC 61770:2008+AMD1:2015 CSV
 IEC 2015
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 . 14
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

 IEC 2015
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 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 consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 61770 edition 2.1 contains the second edition (2008-07) [documents 61/3647/FDIS and
61/3687/RVD] and its amendment 1 (2015-10) [documents 61/4952/FDIS and 61/5004/RVD].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red text. A
separate Final version with all changes accepted is available in this publication.

– 4 – IEC 61770:2008+AMD1:2015 CSV
 IEC 2015
International Standard IEC 61770 has been prepared by IEC technical committee 61: Safety
of household and similar electrical appliances.
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).
...