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This European Standard applies to waste water drainage systems which operate under gravity. It is applicable for drainage systems inside dwellings, commercial, institutional and industrial buildings. The field of application of this European Standard is shown in Figure 1. Differences in plumbing within Europe have led to a variety of systems being developed. Some of the major systems in use are described but this Standard has not attempted to detail the intricacies of each system. Detailed information additional to that contained in this Standard may be obtained by referring to the technical documents listed in Annex A . This first part of the Standard establishes the general and performance requirements for waste water gravity drainage systems. It makes limited provision for pipework conveying trade effluent and for fluids removed by pumps. All drawings in this standard are given as examples and are not intended to exclude any other system configuration.