InSky MASS (Metallic Aerial Self-Supporting) design is similar to OPGW design with a lower cost. It can have up to 48 fibers and its maximum rated design tension can reach up to 67,433 lb. MASS is used on medium and high voltage power lines when it is not possible to use OPGW and ADSS or it is not economically feasible. This cable is not designed to transmit electricity. Relatively small size and weight allows minimizing the load on the towers, and at the same time the necessary sag requirements are met. It is possible to suspend MASS, both in the inter-phase space, and below the phase conductors, in some cases without disconnecting the overhead line. It is suitable for large spans between towers, for installation over rivers and ravines.
Approximately one third of all damage to ADSS cables, as a rule, occurs as a result of vandalism, mainly due to gunshots, while MASS is almost invulnerable to them. Consequently, for the conditions where gunshots are a high risk, the use of MASS becomes not only economically feasible, but also, when OPGW installation is impossible, becomes the only option for building fiber optic communication lines. An additional advantage of MASS can be its insensitivity to fires under the line.
