BS EN 61770:2009

1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General conditions for the tests
6 Airgaps
7 Pipe interrupters
8 Dynamic backflow preventers
9 Hose-sets
Annex A (normative) - Backsiphonage test
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications
Annex ZB (informative) - A-deviations

Describes requirements for appliances for household and similar purposes to prevent the backsiphonage of non-potable water into the water mains.

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.