An overhead fiber optic cable with an external strength member is used for cost-effective building aerial communication systems mostly in rural areas, where towers are located close to each other. Unlike all-dielectric self-supporting cables, where the strength member is placed in the core of the design, in Figure 8 cables the strength element is placed outside the core. The cross-section of this cable type is 8-shaped: the upper part is the suspension element, the lower one is the core with the fiber.

Cables with an external strength member are easier to install. Special clamps hold the cable by the external member, so the risk of damaging the loose tubes with fibers inside is relatively low. However, they have certain limitations related to the maximum permissible tensile load.

InAir Figure 8 cables are intended for multi-purpose outdoor installation. The typical type of installation is aerial fiber optic cable installation between poles and buildings, though these cables can also be pulled into underground ducts and sewer pipes and installed into indoor/outdoor cable conduits and trays.

Incab manufactures 4 types of InAir Figure 8 fiber optic cables:

InAir Figure 8 GSW — is a multi-tube design with a galvanized steel wire as an external strength member

 
  • Affordable alternative to InAir ADSS
  • Low installation cost

InAir Figure 8 FRP — is a multi-tube design with a fiberglass rod as an external strength member

 
  • All-dielectric design
  • Affordable alternative to InAir ADSS
  • Low installation cost

InAir Figure 8 CT GSW — is a central tube design with a galvanized steel wire as an external strength member

 
  • Reduced weight and size
  • Cost-effective design
  • Low installation cost

InAir Figure 8 CT FRP — is a central tube design with a fiberglass rod as an external strength member

 
  • All-dielectric design
  • Reduced weight and size
  • Cost-effective design

Also check how InAir Figure 8 cables can be deployed as part of FTTH system.

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