OFT cables can be installed inside conduits (due to their low coefficient of friction) and on building facades (using fixing clips), providing mechanical resistance to both compression and tension.
These dielectric cables have a black outer sheath made of high-density, halogen-free polyethylene (PE) to withstand ultraviolet (UV) radiation. An LSZH (low smoke zero heat) and flame-retardant sheath is also available. Additionally, the fiberglass yarns provide some protection against rodents.
To ensure the necessary strength for each installation, the tensile elements are embedded in the sheath. These are two FRP (fiberglass reinforced plastic) elements positioned 180° apart. The sheath itself absorbs the cable's tensile stress, relieving the micro-cables of this strain, and provides stability when dealing with expansion and contraction caused by ambient temperature variations.
The flexibility and ease of stripping of microtubes, along with their accessibility via bleed windows, also contribute to reducing the need for intermediate connection boxes and the associated space requirements.
The OFT outdoor range comprises the MicroTube O-FT06 (with a capacity of up to 72 optical fibers) and MicroTube O-FT12 (up to 144 fibers) versions. Both variants are offered with up to twelve active tubes.
The O-FT06 microtubes accommodate 6 fibers per tube (6, 12, 24, 36, 48, and 72 fibers), while the O-FT12 has 12 fibers per tube (12, 24, 36, 48, 72, 96, and 144 fibers).
Options include other fiber types available upon request and special color coding. Furthermore, FT2 and FT4 modules (2 and 4 fibers per tube, respectively) are expected to be released in the near future.
These cables, which also feature water-blocking fiberglass and rip cord, operate in the temperature range of -30 to +60 °C and comply with IEC 60794-1-21 and IEC 60794-1-22 standards.

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