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SLOVENSKI STANDARD
01-oktober-2018
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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 - Exigences pour éviter
le retour d'eau par siphonnage et la défaillance des ensembles de raccordement
Ta slovenski standard je istoveten z: EN 61770:2009/A11:2018
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 61770:2009/A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2018
ICS 97.040; 97.060
English Version
Electric appliances connected to the water mains - Avoidance of
backsiphonage and failure of hose-sets
Appareils électriques raccordés au réseau d'alimentation en Elektrische Geräte zum Anschluss an die
eau - Exigences pour éviter le retour d'eau par siphonnage Wasserversorgungsanlage - Vermeidung von Rücksaugung
et la défaillance des ensembles de raccordement und des Versagens von Schlauchsätzen
This amendment A11 modifies the European Standard EN 61770:2009; it was approved by CENELEC on 2017-12-25. CENELEC members
are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment 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 CEN-CENELEC Management Centre has the same status as
the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61770:2009/A11:2018 E
European foreword
This document (EN 61770:2009/A11:2018) has been prepared by CLC/TC 61 "Safety of household and
similar electrical appliances" in collaboration with CEN/TC 164 “Water Supply”.
It was generated to overcome occurring uncertainties in checking the appliances since extension of the
scope for all EN 60335-2 parts having the necessity to be connected to the water mains.
Significant changes are the adoption of the EN 1717 approach of evaluating the risk categories and
providing provisions / backflow prevention devices to realise prevention against the evaluated risks and to
offer a choice of relevant backflow prevention devices which are already described by separate EN-
Standards but with easing the requirements at points, where definitions which are not safety-relevant for
the use in Electrical Appliances connected to the water mains prohibit industrialised realisation. Examples
are requirements regarding size, stability and markings which are well-grounded for the use in house
installation, but not for the realisation inside an electric appliance.
The following dates are fixed:
• latest date by which this document has
(dop) 2018-11-18
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national
(dow) 2021-05-18
standards conflicting with this
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This amendment supplements or modifies the corresponding clauses of EN 61770:2009.
There are no special national conditions causing a deviation from this amendment.
There are no national deviations from this amendment.
Clauses, subclauses, notes, tables, figures and annexes which are additional to those in IEC 61770:2008
are prefixed “Z”.
1 Scope
Replacement:
This European Standard specifies requirements for appliances for household and similar purposes to
prevent the backflow 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 The connection of the appliance to the water mains may be temporary or permanent.
NOTE 3 When reference is made to the water mains, water supplied from a cistern or similar system is also included.
This standard does not apply to
a) appliances used for dry cleaning;
b) appliances for medical purposes;
c) appliances intended for industrial purposes;
d) water heaters that are an integral part of the water supply system;
e) water coolers that are an integral part of the water supply system;
f) backflow prevention devices for general purposes.
3 Terms and definitions
3.3 Delete the NOTE.
Replace 3.4 by the following:
3.4
airgaps
3.4.Z1
airgap (general)
backflow prevention device with unobstructed free distance between the water inlet or the end of the feed
pipe and the critical water level
3.4.Z2
airgap AA
visible unobstructed and complete air gap placed permanently and vertically between the lowest point of
the inlet feed orifice and any surface of the receiving vessel that determines the maximum water level at
which the device overflows
3.4.Z3
airgap AB
permanent and vertical distance between the lowest point of the inlet orifice and the critical water level
and having a non-circular overflow
3.4.Z4
airgap AD
horizontal and permanent distance between upstream feed orifice and downstream receiving orifice
3.4.Z5
airgap AF
permanent and vertical distance between the lowest point of the inlet orifice and the critical water level or
the top of the overflow having a circular overflow
3.4.Z6
airgap AG
permanent and vertical distance between the lowest point of the inlet orifice and the critical water level
having an overflow capable of draining the maximum inflow of water under fault condition
Replace 3.6 by the following:
3.6 Void
Add the following new definitions after 3.6:
3.6.Z1
pipe interrupter with movable parts
backflow prevention device having air inlets which are generally open to the atmosphere in no flow
conditions and air inlets are closed at a measurable water flow rate through the device
3.6.Z2
dynamic air inlet device
device to prevent pollution by backflow equipped with at least one obturator that opens the air inlet(s) to
atmosphere in case of vacuum at the feed orifice
Note 1 to entry: In some related IEC standards this device may be called ”dynamic backflow preventer“.
Add the following new definitions:
3.Z1
anti-pollution check valve
single safety device, consisting of one closing element, which permits flow in one direction only and
opens automatically when the pressure in the direction of flow upstream the valve is greater than the
pressure downstream
3.Z2
anti-vacuum valve
safety device which provides protection against backsiphonage by opening air inlets to the atmosphere
3.Z3
backflow preventer with reduced pressure zone
safety device which artificially provides disconnection by the action or the reaction of one or more
hydromechanical closing and venting devices activated by pressure differences
Note 1 to entry: Device which uses reduced intermediate pressure zone for action.
3.Z4
combination of protection devices
series combination of an anti-pollution check valve and an anti-vacuum valve respectively located in
downstream direction
3.Z5
protection point
location in a hydraulic circuit where a backflow prevention device is installed
3.Z6
diameter of feed pipe (bore D)
maximum internal diameter (or calculated from the equivalent cross sectional area) found within the last
metre of the supply pipe to the backflow prevention device or the DN of the inlet connection
Note 1 to entry: The dimension of the diameter “D” is in mm.
3.Z7
non-controllable anti-pollution double-check valve
mechanical protection device, equipped with two independent acting anti-pollution check valves, to permit
flow in one direction only
3.Z8
flow pressure
gauge pressure at a measuring point in the system under flow condition
4 General requirements
Add the following new subclause before 4.1:
4.Z1 All materials coming into contact with water intended for human consumption shall present neither
health risk nor cause any change of the drinking water in terms of quality, appearance, smell or taste.
Products intended for use in drinking water supply systems shall comply, when existing, with national
regulations and testing arrangements that ensure fitness for contact with drinking water.
NOTE 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.
4.1 Replace the text by the following:
Appliances shall be provided with a backflow prevention device.
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.
An appliance connected to a water main may have several safety devices. Every safety device shall be
able to protect against the risk for which it is foreseen (see Annex ZA). If a common protection to several
protection points is sought, it is necessary to consider the technical parameter presenting the highest
risk value in the most unfavourable fluid category to all associated parts of the appliance.
Compliance is checked by inspection.
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 Replace the text by the following:
Suitable backflow prevention devices shall be incorporated in, or fixed to the appliance or they shall be
integrated in a hose set.
If the backflow prevention device is integrated in the hose set then the connection to the appliance shall
be fixed permanently and not be detachable without any irreversible damage.
Backflow prevention devices 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;
– its selection of the necessary safety level is in compliance with Annex ZA.
Compliance is checked by inspection.
5 General conditions for the tests
5.1 Title the subclause as “5.1 Normal conditions”
rd
3 dashed item: replace “dynamic pressure” by “flow pressure”
Add the following “NOTE Z1”:
NOTE Z1 Components or products previously being tested and shown to comply with the relevant product standard
need not be re-tested on functionality and endurance.
5.2 Title the subclause as: “5.2 Fault conditions”
5.3 Title the subclause as “5.3 Tests”
Replace in the first dashed item “pipe interrupters and dynamic backflow preventers” by “backflow
prevention devices”.
Replace subclause 5.4 by the following:
5.4 Tests on backflow prevention devices
Backflow prevention devices are tested as installed, unless this is impracticable or is otherwise
specified.
Components that have not been separately tested and found to comply with the relevant EN product
standard and components that are not marked or not used in accordance with their marking are tested in
accordance with the conditions occurring in the appliance. The number of samples being that required by
the relevant EN product standard.
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.
Unless otherwise specified, the tests are carried out at an ambient temperature of 20 °C ± 5 °C.
Replace 5.5 and 5.6 by the following:
5.5 Void.
5.6 Void.
6 Airgaps
Replace the text by the following:
6 Airgaps
6.Z1 General
This clause specifies the characteristics and the requirements of air gaps for fluid category of risk 3, 4
and 5 for nominal flow velocity not exceeding 3 m/s.
6.Z2 Overflow arrangements
All overflow arrangements subsequently connected to a drain shall meet the requirements as detailed in
ZA.5.
6.Z2.1 AB air gap overflow
Shall be of non-circular design, shall discharge immediately into free air and shall be totally unobstructed.
The height of the overflow arrangement Oω is ≥ 2D + h and never less than 20 mm (see Figure Z2,
Figure Z3 and Figure Z4).
6.Z2.2 AF air gap overflow
Shall be of ci
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