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This standard specifies requirements and type tests for Conduit Systems, including Conduits and Conduit Fittings, for the Protection and Management of conductors and/or cables in electrical installations or in communication systems up to 1000 V a.c. and/or 1500 V d.c. This standard applies to metallic, non-metallic and composite conduit systems including threaded and non-threaded entries which terminate the system. This standard does not apply to enclosures and connecting boxes which come within the scope of IEC 670. This part shall be used in conjunction with the relevant Part two for particular requirements.