NBN EN 1717 : 2001

Contents
Foreword
Introduction
1. Scope
2. Normative references
3. Terms and definitions
4. Pollution of potable water:
     general observations
4.1 Backflow of used water
4.2 Connection
4.3 External influences
4.4 Materials
4.5 Stagnation
4.6 Harm caused by inadequate or
     improper maintenance
5. Analysis method of the risks
     at the point of use and choice of
     protection
5.1 General remarks
5.2 Determination of fluid categories
     which are or could be in contact with
     potable water
5.3 Determination of the installation
     characteristics
5.4 Separation by single or double walls
5.5 Air break to drain
5.6 Installation matrix
5.7 Protection units
5.8 Matrix of the protection units appropriate
     to fluid categories
6. Point of use protection for equipment at
     the draw-off point for domestic uses
6.1 Choice of the protection units to be
     implemented
6.2 Location of the protection units
7. Point of use protection of particular
     equipment for non domestic uses
8. Protection at the connection point to
     the public potable water system
9. Air break to drain
Annex A(normative) Reference list of the
       protection units
Annex B(informative) Guide table for
       determining the fluid category from
       which protection is required
Annex C(informative) Summary of the analysis
       method
Bibliography

This standard defines the means to be used to prevent the pollution of potable water inside premises and the general requirements of protection devices to avoid pollution by backflow. It also outlines the minimum requirements for product standards of protection units.