COMMUNICATIONS CABLE

摘要

The invention provides a screened non-coaxial communications cable (2) comprising: a plurality of cores (4) through which communications signals can be transmitted, each core (4) comprising a metallic conductor (6) surrounded by a close-fitting sleeve (8) of insulating material which is substantially free of halogenated polymers, the insulating material having a permittivity of no greater than 3, and being constituted by or containing a layer of foamed polymer (8''), and wherein at least in the region of the insulating material immediately adjacent the metallic conductor (6), the polymer contains no fire retardant metal hydroxide and/or carbonate filler; a first fire protection layer (10) disposed radially outwardly of and surrounding the plurality of cores (4), the first fire protection layer (10) comprising a fabric formed from inorganic fibres; a second fire protection layer (16) disposed radially outwardly of and surrounding the first fire protection layer (10), the second fire protection layer (16) being formed from an extrudable polymer containing a fire retardant metal hydroxide and/or carbonate filler, the first and second fire protection layers (10, 16) not being adhesively bonded together; and a metallic or metallised screening layer (12) disposed between the cores (4) and the second fire protection layer (16).