EVS-EN 61770:2009+A11+A1+A12:2022

This European Standard specifies requirements for appliances for household and similar purposes to prevent the backflow 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  The connection of the appliance to the water mains may be temporary or permanent.
NOTE 3  When reference is made to the water mains, water supplied from a cistern or similar system is also included.
This standard does not apply to
a)  appliances used for dry cleaning;
b)  appliances for medical purposes;
c)  appliances intended for industrial purposes;
d)  water heaters that are an integral part of the water supply system;
e)  water coolers that are an integral part of the water supply system;
f)  backflow prevention devices for general purposes.