IEC 61770 Ed. 1.1 b:2004

Specifies requirements for the connection of appliances to the water mains to prevent backsiphonage of non-potable water into the water mains and flooding due to failure of hose-sets. Appliances include washing machines, dishwashers and other appliances. This includes domestic appliances and those in shops and communal flats. The water pressure is not to exceed 1 MPa. Connection may be temporary or permanent.