Typically all external cables, if under-ground, are installed in a duct. The actual duct can take many shapes and forms, Plastic / Steel / Concrete Metal trays in tunnels etc. We are going to focus on the installation of an Optical Cable in a Plastic Duct. Optical cables are sensitive to force; whether it is tension, torsion, bending or crushing, it could have a long-term effect on the cable's performance. So it is important to have an approved installation method for the deployment of Optical Cables. The focus of this article is on the Installation of Optical Cables in a plastic duct and sub-ducts.