IEC 61770:2008 ED2
(Main)Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets
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
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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
IEC 61770:2008
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 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
14
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
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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
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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
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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).
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– 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.
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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.
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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.
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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 exceeding 1 MPa and a dynamic pressure not
less than 0,6 MPa;
– the appliance is supplied at rated voltage;
– the appliance is tested without being loaded and without cleaning, rinsing or similar
agents, doors and lids being closed.
NOTE When water pressures are stated, they are pressure differences from atmospheric pressure.
5.2 When reference is made to fault conditions, the appliance is inclined at an angle of 2° to
the horizontal in the most unfavourable position. In addition to the normal conditions, the
following fault conditions are applied one at a time, as far as is reasonable, consequential
faults being taken into consideration:
– the connection between any dispenser intended for adding cleaning, rinsing, softening or
similar agents to the water and other parts of the appliance is blocked, unless the cross-
2
sectional area of the connection exceeds 10 cm throughout its length with no dimension
less than 10 mm;
—————————
1)
ISO 6509, Corrosion of metals and alloys – Determination of dezincification resistance of brass
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NOTE Dispenser connections are not blocked if they have cross-sections which are varied by user action each
time the appliance is used, such as opening a detergent dispenser.
– overflows are blocked if they have
2
• a circular cross-section not exceeding 5 cm ,
• a non-circular cross-section with one dimension less than 3 mm and an area not
2
exceeding 5 cm ,
– all magnetic valves upstream of a backflow prevention device which can be open
simultaneously during the normal programme of the appliance are held open;
– all motors are disconnected from the supply mains and the normal drain outlet is blocked.
5.3 Unless otherwise specified, the tests are made in the order indicated and
– for appliances, pipe interrupters and dynamic backflow preventers, on a single sample
as supplied, which shall withstand all the relevant tests;
– for hose-sets, on three samples. If one sample fails, the tests are repeated on a further
set of three samples, all of which shall withstand the repeated tests.
Each of the tests of 9.1.9 to 9.1.11 is carried out on three new samples.
5.4 Tests on airgaps, pipe interrupters and dynamic backflow preventers are made on
or is otherwise specified.
the appliance, unless this is impracticable
5.5 When determining the critical water level of appliances having more than one water
inlet, and a programme permitting simultaneous filling, each water inlet is closed in turn, other
water inlets being open.
5.6 Unless otherwise specified, the tests are carried out at an ambient temperature of 20 °C ±
5 °C.
6 Airgaps
6.1 Airgaps shall be constructed so that the water can flow freely through the air section
and that water downstream of the airgap cannot be drawn into the feed pipe.
Compliance is checked by inspection and by the tests of 6.2 and 6.3. The test of Annex A may
be carried out instead of the test of 6.3.
6.2 The appliance is operated under fault conditions until the maximum water level is
reached.
The water outlet of the feed pipe shall not come into contact with non-potable water.
6.3 The appliance is operated under fault conditions until the critical water level is reached.
The length of the airgap shall be at least twice the smallest diameter of the water supply
system within the appliance, with a minimum of 20 mm. There shall also be a clear space of
20 mm between the outlet of the feed pipe and other parts in any downward direction. The
thickness of any water film and the dimensions of waterdrops shall be taken into account.
7 Pipe interrupters
7.1 Pipe interrupters shall be constructed so that the air-inlet openings remain permanently
free and open to the atmosphere. Water which may leak in normal use from an air-inlet
opening shall flow into the container of the appliance but shall not reach a sufficient level for
the vertical dimensions to be reduced below those specified in 7.3 and 7.4.
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61770 © IEC:2008 – 9 –
Pipe interrupters shall be protected against deliberate obstruction or manipulation which
could affect the results of the tests.
The total cross-sectional area of the air-inlet openings shall not be less than the cross-
sectional area of the water-inlet opening. The smallest dimension of each air-inlet opening
shall be at least 3 mm. The dimensions are measured at right angles to the direction of the
airflow.
Compliance is checked by inspection, measurement and by the tests and measurements of
7.2 to 7.4. However, if the measurements of 7.3 and 7.4 cannot be made due to the
construction of the appliance, compliance is checked by the test of Annex A.
7.2 For separate pipe interrupters, a vertical tube of glass or other transparent material
having approximately the same internal diameter and a length of at least 500 mm, is
connected to the outlet of the pipe interrupter. The free end of the tube is immersed in water
to a depth of at least 25 mm, as shown in Figure 1.
A vacuum pump is connected directly to the inlet of the pipe interrupter and a negative
± 15 kPa is applied for at least 5 s. The distance h between the water
pressure of 65 kPa
level in the tube and the water level in the container is measured.
For pipe interrupters which are incorporated in the appliance downstream of a magnetic
valve, the test is carried out in the appliance. The vacuum pump is connected directly to the
water inlet of the appliance by means of the shortest possible length of tube.
The cross-sectional area of the connection of the vacuum pump shall be sufficient so that the
airflow is not restricted.
NOTE If the inlet hose cannot be removed even with the aid of a tool, the vacuum pump is connected to the inlet
of the hose.
7.3 The appliance is operated under fault conditions, until the maximum water level is
reached.
The vertical distance between the maximum water level and the lowest rim of the air-inlet
opening of the pipe interrupter is measured. It shall be at least equal to dimension h, shown
in Figure 2.
7.4 Immediately after the test of 7.3, the water inlet is closed. The vertical distance between
the critical water level and the lowest rim of the air inlet opening is measured. It shall be at
least equal to h + 20 mm.
The critical water level in the hoses connecting the pipe interrupter to a water softener
downstream of a dynamic backflow preventer is also checked.
NOTE If the critical water level cannot be observed due to an opaque part or hose, this part or hose is replaced
by a transparent part or transparent hose having the same shape and dimensions.
8 Dynamic backflow preventers
8.1 Dynamic backflow preventers shall be constructed so that wear or damage of movable
parts, their supports or guides, or the removal of detachable parts does not allow
backsiphonage. The movable parts shall operate each time the water passes through the
device under conditions of normal use and failure of any of them shall render the appliance
inoperable or shall be evident to the user.
Compliance is checked by inspection and by operating the dynamic backflow preventer as
described in 8.2, followed by the test of Annex A.
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The test of Annex A is carried out under the following conditions:
– with movable parts placed in the most unfavourable position, one at a time;
– after detachable parts have been removed;
– after simulating damage to movable parts, including their supports or guides, one at a
time.
Only one of these three conditions is applied at any one time.
8.2 The device is operated for 5 000 cycles. Each cycle comprises a period of 3 s during
which water flows through the device and a period of 3 s without water flow. The water is at a
pressure of 0,2 MPa and has a temperature of
– 15 °C ± 5 °C, for dynamic backflow preventers in the cold water supply;
– 65 °C ± 5 °C, for dynamic backflow preventers in the hot water supply;
– 65 °C ± 5 °C, for dynamic backflow preventers if the inlet is unmarked.
The test is carried out 10 times with a 48 h rest period. Before each test, the dynamic
backflow preventer is checked to ensure that movable parts operate when water flows
through it.
9 Hose-sets
9.1 Hose-sets shall withstand the stresses to which they may be subjected in normal use.
Compliance is checked by the relevant tests specified in 9.1.1 to 9.1.9 as shown in Table 1 for
different types of hoses and by the tests of 9.1.10 and 9.1.11 for couplings.
During the tests of 9.1.1 to 9.1.8, the hose shall not leak, burst or slip from its couplings.
NOTE 1 Deformation which does not impair the function of the hose-set is ignored.
NOTE 2 Flexible metal hose-sets having a length less than 1 m are not subjected to the tests of 9.1.2 and 9.1.3.
NOTE 3 For hose-sets which incorporate devices for protection against flooding and the hose of which is
contained in a flexible tube, only the hose is subjected to the tests of 9.1.6 to 9.1.8.
NOTE 4 Hoses downstream of a magnetic valve are not subjected to the tests of 9.1.6 to 9.1.8 as long as they
cannot come under pressure due to the operation of another magnetic valve.
Table 1 – Tests applicable to different types of hoses
Type of hose
Thermoplastic
Test
Non- Non-thermoplastic
Thermoplastic with metal Flexible metal
thermoplastic with metal braiding
braiding
Kinking 9.1.1 – 9.1.1 – –
Flexing – – – – 9.1.2
Bending – – – – 9.1.3
Crushing – 9.1.4 – 9.1.4 –
Low temperature – – 9.1.5 9.1.5 –
Ageing 9.1.6 9.1.6 9.1.6 9.1.6 –
Pulsing 9.1.7 9.1.7 9.1.7 9.1.7 9.1.7
Pressure 9.1.8 9.1.8 9.1.8 9.1.8 9.1.8
Ozone 9.1.9 9.1.9 – – –
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