Abstract: Disclosed is an armored fire resistant fiber optic cable including a core comprising a central strength member, and a plurality of buffer tubes arranged around said central strength member, each buffer tube containing a plurality of optical fibers; a first mica layer arranged around the core; an inner sheath surrounding the first mica layer; a metal wire armor surrounding the inner sheath; and an outer sheath surrounding and in direct contact with the metal wire armor, wherein a second mica layer surrounds the inner sheath and the metal wire armor surrounds the second mica layer.

Abstract: Disclosed is an opto-electric cable including one or more electrical conductors. Each conductor includes an electrically conductive core and an electrically insulating layer surrounding it. The cable also includes an optical unit embedded within one of the electrically conductive cores. The optical unit includes at least two optical fibers and a single buffer jointly surrounding all the optical fibers. Each optical fiber includes a core, a cladding and a coating. Since all the optical fibers of the optical unit are jointly surrounded—and protected—by a single buffer, an optical unit with a reduced size is obtained. This allows reducing the cross section of the electrical conductor in which the optical unit is arranged. In particular, electrical conductors with cross section lower than 10 mm2 are obtained.

Abstract: Disclosed is a fire resistant, all dielectric fiber optic cable with high fiber count. The cable comprises a core including a central strength member and buffer tubes containing fibers, arranged around the central strength member. A first mica layer is arranged around the core. A glass yarn layer surrounds the first mica layer and is in direct contact therewith. A inner sheath surrounds the glass yarn layer. A second mica layer surrounds the inner sheath. An outer sheath surrounds the second mica layer. The buffer tubes contain a water-blocking filling material comprising a silicone gel, wherein said silicone gel has a drop point of at least 200° C.

Abstract: Disclosed is a fire resistant, all dielectric fiber optic cable with high fiber count. The cable comprises a core including a central strength member and buffer tubes containing fibers, arranged around the central strength member. A first mica layer is arranged around the core. A glass yarn layer surrounds the first mica layer and is in direct contact therewith. A inner sheath surrounds the glass yarn layer. A second mica layer surrounds the inner sheath. An outer sheath surrounds the second mica layer. The buffer tubes contain a water-blocking filling material comprising a silicone gel, wherein said silicone gel has a drop point of at least 200° C.

Abstract: The present disclosure relates to a signalling cable that includes: a cable core, a metallic screen surrounding and in direct contact with the cable core, and at least one flame retardant low smoke zero halogen polymeric sheath surrounding and in radially position with respect to the metallic screen. The cable core includes a plurality of insulated electric conductors and a core wrap. The insulated electric conductors each includes an electric conductor insulated by a fire barrier and a flame retardant low smoke zero halogen polymeric insulating layer.

Abstract: Disclosed is an opto-electric cable including one or more electrical conductors. Each conductor includes an electrically conductive core and an electrically insulating layer surrounding it. The cable also includes an optical unit embedded within one of the electrically conductive cores. The optical unit includes at least two optical fibers and a single buffer jointly surrounding all the optical fibers. Each optical fiber includes a core, a cladding and a coating. Since all the optical fibers of the optical unit are jointly surrounded—and protected—by a single buffer, an optical unit with a reduced size is obtained. This allows reducing the cross section of the electrical conductor in which the optical unit is arranged. In particular, electrical conductors with cross section lower than 10 mm2 are obtained.

Abstract: A flame-retardant optical cable is disclosed which includes a polymeric central loose tube housing optical fibres, a metallic armour surrounding the polymeric central loose tube, and a multi-layered sheath surrounding and in direct contact with the metallic armour. The multi-layered sheath includes an inner layer, an intermediate layer, and an outer layer, all made of a LSoH flame-retardant material. The LSoH flame-retardant material of the intermediate layer has a limiting oxygen index (LOI) higher than the LOI of the LSoH flame-retardant material of the inner layer and of the outer layer. Such cable has improved flame-retardant properties, particularly in terms of slowing flame propagation, heat release, droplets and emission of smokes, when it is exposed to flames during fire.

Abstract: A fire-resistant optical fibre cable includes a core having a central strength member and buffer tubes arranged around the central strength member. Each buffer tube contains optical fibres. A mica layer is arranged around the core. A glass yarn layer surrounds and is in direct contact with the mica layer. Metal armour surrounds the glass yarn layer. A multi-layered sheath surrounds and is in direct contact with the armour. The sheath includes a first layer, a second layer surrounding and in contact with the first layer, and a third layer in a radial inner position with respect to the first layer and in direct contact thereto. The first, second and third layers are made of LS0H flame-retardant material. The LS0H material of the first layer has an LOI higher than the LOI of the LS0H material of the second and third layers. The second layer is the cable outermost layer.

Abstract: In one embodiment, a fiber optic cable comprises a core comprising a central strength member and a plurality of buffer tubes arranged around the central strength member, where each buffer tube includes a plurality of optical fibers. The fiber optic cable includes a mica layer arranged around the core, a glass yarn layer surrounding and in direct contact with the mica layer, an inner sheath surrounding and in direct contact with the glass yarn layer, a metal armor surrounding the inner sheath; and an outer sheath surrounding and in direct contact with the metal armor. The central strength member comprises a hydroxide-containing flame retardant polymeric material, and the plurality of buffer tubes contain a water-blocking filling material comprising a silicone gel, where the silicone gel has a drop point of at least 200° C., and where the fiber optical cable is configured to be fire resistant.

Abstract: Disclosed is an armored fire resistant fiber optic cable including a core comprising a central strength member, and a plurality of buffer tubes arranged around said central strength member, each buffer tube containing a plurality of optical fibers; a first mica layer arranged around the core; an inner sheath surrounding the first mica layer; a metal wire armor surrounding the inner sheath; and an outer sheath surrounding and in direct contact with the metal wire armor, wherein a second mica layer surrounds the inner sheath and the metal wire armor surrounds the second mica layer.

Abstract: A flame-retardant optical cable is disclosed which includes a polymeric central loose tube housing optical fibres, a metallic armour surrounding the polymeric central loose tube, and a multi-layered sheath surrounding and in direct contact with the metallic armour. The multi-layered sheath includes an inner layer, an intermediate layer, and an outer layer, all made of a LSoH flame-retardant material. The LSoH flame-retardant material of the intermediate layer has a limiting oxygen index (LOI) higher than the LOI of the LSoH flame-retardant material of the inner layer and of the outer layer. Such cable has improved flame-retardant properties, particularly in terms of slowing flame propagation, heat release, droplets and emission of smokes, when it is exposed to flames during fire.

Abstract: In one embodiment, a fiber optic cable comprises a core comprising a central strength member and a plurality of buffer tubes arranged around the central strength member, where each buffer tube includes a plurality of optical fibers. The fiber optic cable includes a mica layer arranged around the core, a glass yarn layer surrounding and in direct contact with the mica layer, an inner sheath surrounding and in direct contact with the glass yarn layer, a metal armor surrounding the inner sheath; and an outer sheath surrounding and in direct contact with the metal armor. The central strength member comprises a hydroxide-containing flame retardant polymeric material, and the plurality of buffer tubes contain a water-blocking filling material comprising a silicone gel, where the silicone gel has a drop point of at least 200° C., and where the fiber optical cable is configured to be fire resistant.

Abstract: The present disclosure relates to a signalling cable that includes: a cable core, a metallic screen surrounding and in direct contact with the cable core, and at least one flame retardant low smoke zero halogen polymeric sheath surrounding and in radially position with respect to the metallic screen. The cable core includes a plurality of insulated electric conductors and a core wrap. The insulated electric conductors each includes an electric conductor insulated by a fire barrier and a flame retardant low smoke zero halogen polymeric insulating layer.

Abstract: A self-supporting overhead telecommunication/power cable includes a supporting portion and a transmission portion mutually arranged according to a figure-8 configuration. The transmission portion includes at a central position thereof, an optical fibre conductor and, at a radially outer position with respect to the optical fiber conductor, electrical conductors stranded around the optical fiber conductor. Preferably, the electrical conductors are grouped into sub-units which are stranded around the optical fiber conductor to provide a mechanical protection thereto.