1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication WB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1 Electric appliances connected to the water mains Avoidance of backsiphonage and failure of hose-sets BS E
2、N 61770:2009 Incorporating corrigendum March 2011National foreword This British Standard is the UK implementation of EN 61770:2009, incorporating which will be withdrawn on 1 May 2012. The UK participation in its preparation was entrusted by Technical Committee CPL/61, Safety of household and simila
3、r electrical appliances, to Subcommittee CPL/61/14, Home laundry and dishwashers. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
4、correct application. BSI 2011 ISBN 978 0 580 75735 8 ICS 91.140.60; 97.040.40; 97.060 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2009 BRITISH STAND
5、ARD BS EN 61770:2009 corrigendum March 2011. It is identical to IEC 61770:2008. It supersedesBS EN 61770:1999+A2:2006, Amendments corrigenda issued since publicationDate T ext affected / 30 June 2011 Incorporation of CENELEC corrigendum 2011:Addition of Annex ZB March EUROPEAN STANDARD EN 61770 NORM
6、E EUROPENNE EUROPISCHE NORM May 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in
7、any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61770:2009 E ICS 91.140.60; 97.030Supersedes EN 61770:1999 + A1:2004 + A2:2006English version Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets (IEC 61770:2008) Appareil
8、s lectriques raccords au rseau dalimentation en eau - Exigences pour viter le retour deau par siphonnage et la dfaillance des ensembles de raccordement (CEI 61770:2008) Elektrische Gerte zum Anschluss an die Wasserversorgungsanlage - Vermeidung von Rcksaugung und des Versagens von Schlauchstzen (IEC
9、 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 bib
10、liographical 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 responsibil
11、ity 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, Gree
12、ce, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Incorporating corrigendum March 2011 Foreword The text of document 61/3647/FDIS, future edition 2 of
13、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
14、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
15、 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
16、 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 n
17、otice The text of the International Standard IEC 61770:2008 was approved by CENELEC as a European Standard without any modification. _ 2 BS EN 61770:2009 EN 61770:2009 (E) Annex ZA (normative) Normative references to international publications with their corresponding European publications The follo
18、wing 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 b
19、y common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60730-2-8 (mod) - 1)Automatic electrical controls for household and similar use - Part 2-8: Particular requirements for electrically operated water valves, including mechanical requirements
20、EN 60730-2-8 2002 2)1) Undated reference. 2) Valid edition at date of issue. 3 BS EN 61770:2009 EN 61770:2009 (E)Annex ZB (informative) A-deviations A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the competence of the CEN/CENELEC member. Thi
21、s European Standard falls under Directive 2006/95/EC. A-deviations in an EFTA-country are valid instead of the relevant provisions of the European Standard in that country until they have been removed. Clause Deviation 1 United Kingdom (The England and Wales Water Supply (Water Fittings) Regulations
22、 1999 and equivalent Water Byelaws in Scotland and Northern Ireland) The following additional requirement applies: Constructional materials of the appliance shall not adversely affect the quality of the water with which they may come into contact upstream of the backflow prevention device. Complianc
23、e is checked by the tests specified in BS 6920. 4.1 United Kingdom (The England and Wales Water Supply (Water Fittings) Regulations 1999 and equivalent Water Byelaws in Scotland and Northern Ireland) The following additional requirement applies: The backflow prevention device shall be in accordance
24、with the Secretary of State Specification for the Requirements for the Prevention of Backflow. _ 4 BS EN 61770:2009 EN 61770:2009 (E) IEC 61770 Edition 2.0 2008-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Electric appliances connected to the water mains Avoidance of backsiphonage and failure of h
25、ose-sets Appareils lectriques raccords au rseau dalimentation en eau Exigences pour viter le retour deau par siphonnage et la dfaillance des ensembles de raccordement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 91.140.60; 97.030 PRICE CODE CODE PRIX ISB
26、N 2-8318-9918-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale CONTENTS 1 Scope. 2 Normative references . 3 Terms and definitions . 4 General requirements. 5 General conditions for the tests 6 Airgaps. 7 Pipe interr
27、upters.10 8 Dynamic backflow preventers . 9 Hose-sets.12 Annex A (normative) Backsiphonage test.23 Figure 1 Arrangement for the determination of “h“ for pipe interrupters 16 Figure 2 Arrangement for the determination of maximum and critical water levels for pipe interrupters .17 Figure 3 Kinking tes
28、t18 Figure 4 Arrangement for verifying the resistance of hose-sets to pulses .18 Figure 5 Mandrel for testing coupling nuts .19 Figure 6 Mandrel for ozone test on hose-sets 19 Figure 7 Arrangement for the flexing test . Figure 8 Arrangement for the bending test . Figure 9 Detail for applying the ben
29、ding moment to coupling tubes Figure 10 Detail for the impact test on coupling tubes22 Table 1 Tests applicable to different types of hoses.12 6 BS EN 61770:2009 EN 61770:2009 (E) 7 7 7 8 9 10 11 20 21 21ELECTRIC APPLIANCES CONNECTED TO THE WATER MAINS AVOIDANCE OF BACKSIPHONAGE AND FAILURE OF HOSE-
30、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 wa
31、ter 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 i
32、ndustrial 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
33、 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
34、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
35、 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
36、 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 air
37、gaps, dynamic backflow preventers and pipe interrupters. 7 BS EN 61770:2009 EN 61770:2009 (E)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
38、 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
39、 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 whi
40、ch 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
41、 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 incor
42、porated 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 o
43、f a backflow prevention device shall not pass through non-potable water in the appliance. Compliance is checked by inspection. 8 BS EN 61770:2009 EN 61770:2009 (E)NOTE For a given point in a hydraulic system, “upstream“ indicates the side from which the water flows and “downstream“ indicates the sid
44、e 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 characteris
45、tics 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
46、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, sh
47、all be resistant to erosion, dezincification, oxidation or corrosion. Compliance is checked by inspection. NOTE Resistance to dezincification of brass can be checked in accordance with ISO 6509 1) . 5 General conditions for the tests 5.1 When reference is made to normal conditions, the following app
48、lies: 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 voltag
49、e; 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
