ISO 15877-7:2009 gives guidance for the assessment of conformity included in the manufacturer's quality plan as part of his/her quality system.ISO 15877-7:2009 includes:- provisions for materials, components, joints and assemblies given in the applicable part(s) of ISO 15877;- provisions for the manufacturer's quality system, which can conform to ISO 9001;- definitions and procedures applied if certification is involved; in which case, the certification body can be accredited to ISO/IEC Guide 65 or ISO/IEC Guide 62, as applicable.In conjunction with the other parts of ISO 15877, ISO 15877-7:2009 is applicable to chlorinated poly(vinyl chloride) (PVC-C) piping systems intended to be used for hot and cold water installations within buildings for the conveyance of water, whether or not intended for human consumption (domestic systems), under design pressures and temperatures appropriate to the class of application (see Table 1 of ISO 15877-1:2009).