Duct cables Optical cable for duct installation Cable Design Central Strength Member (CSM) Loose Tube containing fibres and filled with a suitable water tightness compound. Loose tubes SZ stranded around the CSM. Longitudinal Water Tightness: dry core with water swellable elements. Peripheral Strength Elements Outer Sheath: PE. Black. Features and advantages Installation in duct. Static cable bending radius Temperature range Duct installation cables are very suitable for pulling, blowing or floating installation into duct. Technical data No. of Fibres (x12) Cable Diameter Cable Weight International Standards : IEC 60794; IEC 60793; ITU-T Rec. G.650; ITU-T Rec. G.652 ; ITU-T Rec. G.655 ; ITU-T Rec. G.656 ; ITU-T Rec. G.657 ;