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IEC 61386-24 Ed. 1.0 b:2004
Conduit systems for cable management - Part 24: Particular requirements - Conduit systems buried underground
This standard specifies requirements and tests for conduit systems buried underground including conduits and conduit fittings for the protection and management of insulated conductors and/or cables in electrical installations or in communication systems. This standard applies to metallic, non-metallic and composite systems including threaded and non-threaded entries which terminate the system.
International Electrotechnical Commission [iec]