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DS/EN 61770:2009/A1:2019

Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets


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.


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