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Radius of curvature

The radius of curvature of the cables must not be exceeded. The fiber optic cable may break when it twists or bends too much, especially during pulling. If there are no specific recommendations of the cable manufacturer, it should not be pulled at a radius of curvature less than 20 (twenty) times the diameter of the cable.

When finished pulling, the cable should not have any radius of curvature less than 10 (ten) times the diameter of the cable.

Vertical cable installations

Whenever possible, it is better to lay the cables vertically down than to pull them up. Cables should be fastened at frequent intervals to avoid excessive tension in the jacket. They can be fastened with cable ties (well adjusted, but not enough to deform the cable jacket) or with Kellem type fasteners. Use the storage loops to help fix the cable and to provide cable for future repairs or re-installation.

Internal plant wiring with trays

Many times, the fiber optic cable in the wiring in the internal plant is installed in cable trays. Cable trays should also not have copper telecommunications cables, as their weight could damage fiber cables. Similarly, a large number of fiber cables in the same tray could put a lot of pressure on the cables that are in the base. In installations where the trays are occupied with copper telecommunication cables, light fiber cables can be suspended under the cable trays. 

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