IEEE 1594-2008 pdf download IEEE Standard for Helically Applied Fiber Optic Cable Systems (Wrap Cable) for Use on Overhead Utility Lines
4.Component requirements
4.1 Support systems
Support systems for the cable itself are not required. The ground wire, phase wire, or other messenger inoverhead power facilities around which the cable is wrapped provides all the support for the compositesystem and eliminates the need for the cable to be self-supporting.
4.2 Fiber optic cable core
The fiber optic cable core shall be made of coated glass optical fibers housed to protect them frommechanical. environmental, and electrical stresses. Materials used within the core shall be compatible withone another, shall not degrade under the electrical stresses to which they may be exposed, and shall notevolve hydrogen sufficient to degrade optical performance of fibers within the cable.
4.2.1 Fiber strain allowance
The fiber optic cable core shall be designed so that the fibers remain tensile stress-free under the maximumworking elongation of the cable being wrapped on, and taking into consideration strains created during theinstallation.
4.2.2 Central structural element
If a central structural element is necessary, it shall be of reinforced plastic, epoxiglass, or other dielectricmaterial. If required,this element shall provide the necessary tensile strength to limit axial strain on thefibers and minimize fiber buckling due to cable contraction at low temperatures.
4.2.3 Buffer tube filling compound
Loose buffer tubes shall be filled with a suitable compound compatible with the tubing material, fibercoating, and coloring to protect the optical fibers and prevent moisture ingress.
4.2.4 Cable core filling/flooding compound
The design of the cable shall include a suitable filling/flooding compound or water-swellable material inthe interstices to prohibit water migration along the fiber optic cable core. The filling/flooding compoundor water-swellable compound shall be compatible with all components with which it may come in contact.
4.2.5 Binder/tape
A binder yarn(s) and/or layer(s) of overlapping non-hydroscopic tape(s) may be used to hold the cable coreelements in place during application of the jacket.
4.3 Optical fibers
Single-mode fibers, dispersion-unshifted or dispersion-shifted, and multimode fibers with 50/125 um or62.5/125 um core/clad diameters are considered in this document. The core and the cladding shall consistof glass, which is predominantly silica (SiO,). The coating, usually made from one or more acrylatematerials or compositions, Shall be provided to protect the fiber during manufacture, handling, and use.
4.4 Buffer construction
The individually coated optical fiber(s) may be surrounded by a buffer for protection from physical damageduring fabrication. installation and performance of the wrap cable. Loose buffer or tight buffeconstruction are two types of protection that may be used. The fiber coating and buffer shall be strippablefor splicing and termination.
4.4.1 Loose buffer
Loose buffer construction shall consist of a tube or channel that surrounds each fiber or fiber group. Theinside of the tube or channel shall be filled with a filling compound.
4.4.2 Tight buffer
Tight buffer construction shall consist of a suitable material that comes in contact with the coated fiber.
4.5 Color coding
Color coding is essential for identifying individual optical fibers and groups of optical fibers. The colorsshall be in accordance with TIA/EIA 598-B4