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This Technical Specification gives the recommended practice for installation of thermoplastics piping systems in the field of soil and waste discharge (low and high temperature) inside buildings (marked with “B”). This Technical Specification is applicable to thermoplastics pipes and fittings as specified in the associated standards ISO 3633 (PVC-U), ISO 7671 (PP), ISO 7682 (ABS), ISO 8770 (PE-HD), ISO 19220 (SAN + PVC) and ISO 7675 (PVC-C), their joints and to joints with components of other plastics and non-plastics materials intended to be used for the following purposes. a) Soil and waste discharge pipework for the conveyance of domestic waste waters (low and high temperature). NOTE 1 See Clause 4 for waste discharge temperature limits. b) Ventilating pipework associated with a). c) Rainwater pipework within the building structure (see Figure 1). If specified in the relevant associated standard, this Technical Specification also covers soil and waste discharge pipework fixed externally on to the building (See Figure 1). It is not applicable to pipework that passes under the building without any connection from the discharge system. NOTE 2 According to the associated standards, for external above-ground soil and waste discharge, additional requirements depending on the climate are to be agreed between the manufacturer and the user. NOTE 3 According to the associated standards, components conforming to other standards on plastic piping systems may be used with pipes and fittings conforming to a given associated standard, if they conform to the requirements for joint dimensions and functional requirements of the given associated standard.