G - Physics – 02 – B
Patent
G - Physics
02
B
88/97.64
G02B 6/04 (2006.01)
Patent
CA 1275590
Abstract of the Disclosure The invention relates to a fire-proof fibre cable comprising a signal carrying, optical fibre which is embraced by a protecting jacket, preferably of organic material. In order to prevent oxidization of the fibre surface as well as reduce the mechanical and thermal stresses on the fibre, the jacket can be filled with a passive viscous material. In order to maintain the mechanical protection of the optical fibre during a fire, the protecting tube is surrounded by an inorganic fire retardant material which during a fire provides a new pipe substituting the protecting jacket. Preferably, the protecting jacket is covered by mica tape, possibly an inorganic mass or another material which during fire is subjected to a sintering process and forms a fire protecting pipe. Preferably, the protecting jacket and its surrounding mica tape, or a group of such assemblies, is surrounded by a layer of glass tape, as well as a filler jacket, and another glass tape, possibly reinforced with steel there- around. Further, the cable may be equipped with an outer jacket of a material which yields a protective ash during fire.
487209
Gjonnes Leif Egil
Spillum Magne
Norsk Fiberoptik A/s
Swabey Ogilvy Renault
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