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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. 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 fifth part of the Standard sets out the principles, which should be followed when installing and maintaining waste water and rainwater gravity drainage systems. It deals with fixing, support, containment of thermal movement, protection and accessibility of the system. All drawings in this standard are given as examples and are not intended to exclude any other system configuration.