RS ISO 21138-2: 2020 PLASTICS PIPING SYSTEMS FOR NON-PRESSURE
UNDERGROUND DRAINAGE AND SEWERAGE —
STRUCTURED-WALL PIPING SYSTEMS OF
UNPLASTICIZED POLY(VINYL CHLORIDE) (PVC-U),
POLYPROPYLENE (PP) AND POLYETHYLENE (PE) —
PART 2: PIPES AND FITTINGS WITH SMOOTH EXTERNAL
SUR
RS ISO IEC TS 17021-7: 2014 CONFORMITY ASSESSMENT — REQUIREMENTS FOR BODIES PROVIDING AUDIT AND CERTIFICATION OF MANAGEMENT SYSTEMS — PART 7: COMPETENCE REQUIREMENTS FOR AUDITING AND CERTIFICATION OF ROAD TRAFFIC SAFETY MANAGEMENT SYSTEMS
