1、 IEC 61770Edition 2.0 2008-07INTERNATIONAL STANDARD NORME INTERNATIONALEElectric appliances connected to the water mains Avoidance of backsiphonage and failure of hose-sets Appareils lectriques raccords au rseau dalimentation en eau Exigences pour viter le retour deau par siphonnage et la dfaillance
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16、es questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61770Edition 2.0 2008-07INTERNATIONAL STANDARD NORME INTERNATIONALEElectric appliances connected to the water mains Avoidance of backsiphonage and failure of hose-sets
17、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 SICS 91.140.60; 97.030 PRICE CODECODE PRIXISBN 2-8318-991
18、8-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 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
19、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 .
20、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
21、 Detail for applying the bending moment to coupling tubes 19 Figure 10 Detail for the impact test on coupling tubes20 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 BAC
22、KSIPHONAGE 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 questio
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31、blications. 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
32、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 publi
33、shed 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 norma
34、tive 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 f
35、ound 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 th
36、e 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 sit
37、e 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 organiza
38、tions 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 st
39、andard 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 re
40、quirements 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 Example
41、s 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 integra
42、l 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 in
43、cluded. 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 th
44、is 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 ope
45、rated 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 dev
46、ice 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 interrupte
47、rs. 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 applianc
48、e. 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 a
49、ppliance 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 hos
