NEXANS Launches Its New INFITTM Technology Dedicated To
Fire-Resistant Cables Insulation
Nexans, the worldwide leader in the cable industry, has further
extended its mastering of advanced technology by launching the new
INFITTM technology dedicated to fire resistant cables.
Fire-resistant cables ensure the integrity and continued operation
of vital safety circuits during the critical evacuation and fire
fighting periods required by the highest national and international
standards. INFITTM allows a high class fire resistance performance
together with an improvement of the installation behaviour of the
cables.
INFITTM advanced technology
To insure integrity of flexible cable insulation during a fire, the
cable industry mainly used up to now 2 major technologies: fire
resistant Mica taping and ceramic forming silicone rubbers.
Each of these technologies presents numbers of advantages. The
classical insulation taping based on Mica, and largely used since
the 80’s, can for example be easily implemented at industrial scale
by giving a hard and good electrical insulation when overcoated with
a cross-linked polyethylene. And, the Silicone rubber insulation
with its direct extrusion on the conductors gives a good compromise
between fire performance and easiness of installation. Nevertheless,
considering the new customer requirements regarding resistance,
strippability, easiness of connection and of course fire
performance, Nexans has developed a technology dedicated to
fire-resistant cables insulation.
INFITTM is a unique innovative technology which combines in a
polymeric material the advantages of the tough mica tapes layer and
the extruded silicone insulation layer. This enables the Nexans
cables to combine the hard and easy to handle surface of traditional
mica tape/XLPE cables with the strippability and easy installation
of flexible silicone rubber insulated cables.
INFITTM technology allows an enhanced integrity of cable insulation
during a fire. In the event of a fire, INFIT™ transforms the
insulation from a flexible, plastic covering to a tough insulating
ceramic layer to assure circuit-integrity (i.e. no breaks or short
circuits).
INFIT TM, a fruitful result of an ambitious Research & Development
project.
This technology has been developed in the Nexans International
Research Center based in Lyon, France, in close partnership with the
Australian Nexans R&D Center, during the last ten years. The
development of this technology is based on basic studies especially
highlighting the synergy between the ceramic science and the latest
polymer science.
In case of accidental fire, the temperature ramp up cannot be
managed when classically in ceramic science, a well defined curing
process must be followed to form a high performance ceramic. The
first challenge to manage was to develop a ceramic forming system
able to react and form an electrical insulation in a very short time
in a large range of temperature increase, and exhibiting a high
electrical insulation. The second parallel challenge was to reach
this performance from a formulated polymeric extrudable material
(and not from a powder), fulfilling with all the very demanding
standards of the cable industry.
INFITTM is implemented in respect of many worldwide cable standards
and according to the most rigorous product quality and safety
criteria. Nexans cables insulated with INFITTM can resist to fires
reaching temperatures about 1,000°C, under voltage up to 1kV,
exhibiting greater char cohesion and electrical insulation during
fire.
INFITTM is a proprietary Nexans technology protected by a dedicated
patent portfolio.
INFIT TM, a transversal technology through the cables markets.
INFITTM will be gradually deployed in the coming months thought the
whole fire resistant product ranges of Nexans for building as well
as industrial application like for example shipboard constructions.
Email:
Michel.gedeon@nexans.com
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News Categories : Fire resistant cables
Safety circuits
Electrical power cable
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