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1、BRITISH STANDARD BS EN 61770:1999 IEC 61770:1998 Electric appliances connected to the water mains Avoidance of backsiphonage and failure of hose-sets The European Standard EN 61770:1998 has the status of a British Standard ICS 97.040.40; 97.060 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13
2、17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61770:1999 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 1999 BSI 03-2000 ISBN 0 580 32
3、319 6 Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61770:1999 BSI 03-2000i Contents Page National forewordii Foreword2 Text of EN 617703 Licensed Copy: sheffieldun sheffieldun
4、, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61770:1999 ii BSI 03-2000 National foreword This British Standard is the English language version of EN 61770:1998. It is identical with IEC 61770:1998. It supersedes BS EN 50084:1992 which will be withdrawn on 2001-07-01. Th
5、e UK has requested that UK A-Deviations are added to Annex B in order to take account of the additional requirements of the UK Model Water Byelaws: 1986. It is requested that these deviations are included by an amendment. The UK participation in its preparation was entrusted by Technical Committee C
6、PL/61, Safety of household and similar electrical appliances, to Subcommittee CPL/61/14, Home laundry appliances and dishwashers, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or
7、 proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the n
8、umber 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CEN
9、ELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications referred to in this document may be found in the BSI Standards Ca
10、talogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for thei
11、r correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 15 and a back cover. This standard has been updated (see c
12、opyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61770 Nove
13、mber 1998 ICS 91.140.60; 97.030 English version Electric appliances connected to the water mains Avoidance of backsiphonage and failure of hose-sets (IEC 61770:1998) Elektrische Gerte zum Anschlu an die Wasserversorgungsanlage Vermeidung von Rcksaugung und Fehlern bei Schlauchstzen (IEC 61770:1998)
14、This European Standard was approved by CENELEC on 1998-10-01. 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 bibliographical
15、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 responsibility of a CENE
16、LEC 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Net
17、herlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CE
18、NELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61770:1998 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61770:1998 BSI 03-2000 2 Foreword The text of document 61/1480/
19、FDIS, future edition 1 of 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 1998-10-01. The following dates were fixed: Annexes designated “normative” are part of the body
20、 of the standard. Annexes designated “informative” are given for information only. In this standard, Annex A and Annex ZA are normative and Annex ZB is informative. Annex ZA and Annex ZB have been added by CENELEC. Endorsement notice The text of the International Standard IEC 61770:1998 was approved
21、 by CENELEC as a European Standard without any modification. Contents Page Foreword2 1Scope3 2Normative reference3 3Definitions3 4General requirements3 5General conditions for the tests4 6Airgaps5 7Pipe interrupters5 8Dynamic backflow preventers5 9Hose-sets6 Annex A (normative) Backsiphonage test13
22、Annex ZA (normative) Normative references to international publications with their corresponding European publications13 Annex ZB (informative) A-deviations13 Figure 1 Arrangement for the determination of “h” for pipe interrupters8 Figure 2 Arrangement for the determination of maximum and critical w
23、ater levels for pipe interrupters9 Figure 3 Kinking test9 Figure 4 Arrangement for verifying the resistance of hose-sets to pulses10 Figure 5 Mandrel for testing coupling nuts10 Figure 6 Mandrel for ozone test on hose-sets10 Figure 7 Arrangement for the flexing test11 Figure 8 Arrangement for the be
24、nding test11 Figure 9 Detail for applying the bending moment to coupling tubes12 Figure 10 Detail for the impact test on coupling tubes12 Table 1 Tests applicable to different types of hoses6 latest date by which the EN has to be implemented at national level by publication of an identical national
25、standard or by endorsement (dop) 1999-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 2001-07-01 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61770:1998 BSI 03-20003 1 Scope This stan
26、dard specifies requirements for the connection of washing machines, dishwashers and condensation-type tumble dryers to the water mains having a water pressure not exceeding 1 MPa for prevention of backsiphonage of non-potable water into the water mains and flooding due to failure of hose-sets. This
27、standard may also be applied to the connection of other appliances as long as the relevant safety standard refers to it but modifications may be necessary. NOTE 1This standard covers the connection of appliances in shops and communal flats, for the use by staff or residents. NOTE 2This standard does
28、 not apply to appliances: used for dry cleaning; for medical purposes; intended for industrial purposes. NOTE 3The connection of the appliance to the water mains may be temporary or permanent. NOTE 4When reference is made to the water mains, water supplied from a cistern or similar system is also in
29、cluded. NOTE 5Many countries have requirements concerning the prevention of contamination of potable water as a result of contact with unsuitable materials upstream of a safety device. 2 Normative reference The following normative document contains provisions which, through reference in this text, c
30、onstitutes provisions of this International Standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
31、 editions of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60730-2-8:1992, Automatic electrical controls for household and similar use Part 2: Particular requirements for electrically operated water valves, including
32、 mechanical requirements. 3 Definitions For the purpose of this standard, the following 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
33、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 NOTEExamples are airgaps and pipe interrupters. 3.4 airgap unobstructed free distance between the water inlet or the end of
34、 the feed pipe and the critical water level NOTEA 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 whi
35、le 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-po
36、table 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 couplin
37、gs NOTE 1The hose-set is for connecting the appliance upstream of the backflow prevention device to the water mains. NOTE 2Couplings 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 shal
38、l have a backflow prevention device located downstream of each water inlet valve. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 17:38:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61770:1998 4 BSI 03-2000 For appliances incorporating a water softener located upstream of an airgap or pipe
39、 interrupter, a dynamic backflow preventer shall be incorporated upstream of the water softener. 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
40、 backflow prevention device shall not pass through non-potable water in the appliance. Compliance is checked by inspection. NOTEFor 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
41、 prevention devices shall be incorporated in the appliance and 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
42、 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,
43、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. NOTEResistance to dezincification of brass can be checked in accordance with ISO 6
44、5091). 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
45、 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 textiles or dishes and without cleaning, rinsing or similar agents, doors and lids being closed. NOTEWhen water pressures are stated, they are pressure diffe
46、rences 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: t
47、he 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-sectional area of the connection exceeds 10 cm2 throughout its length with no dimension less than 10 mm; NOTE 1Dispenser c
48、onnections 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 a circular cross-section not exceeding 5 cm2, a non-circular cross-section with one dimension less than 3
49、mm and an area not exceeding 5 cm2, all magnetic valves upstream of an airgap or pipe-interrupter 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. NOTE 2The fault conditions are applied together with any consequential fault condition. 5.3 Unless otherwise specified, the tests are made in the order indicated and for appliances, pipe interrupters and dynamic backflow