Medium voltage electric cable with improved behavior under fire
AssigneePrysmian S.p.A.
InventorsZekeriya Sirin, Bilal Ozdemir, Serdar Büyük
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Abstract
A medium voltage electric cable having a conductor, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a wire metal screen, a filler layer made from an extruded elastomeric low smoke zero halogen (LSOH) composition containing a polyethylene homopolymer and/or copolymer having a density lower than 0.93 g/cm3 and a metal hydroxide, and an outer sheath made from a low smoke zero halogen (LSOH) composition containing a polymer mixture of an EVA polymer and polyethylene homopolymer and/or copolymer having a density lower than 0.93 g/cm3, the polymer mixture being charged with a metal hydroxide and a phyllosilicate clay.
Claims16
A medium voltage electric cable comprising:
- a conductor;
- an inner semi-conductive layer arranged in a radially outer position with respect to the conductor;
- an insulating layer arranged in a radially outer position with respect to the inner semi-conductive layer and directly contacting the inner semi-conductive layer;
- an outer semi-conductive layer arranged in a radially outer position with respect to the insulating layer and directly contacting the insulating layer;
- a wire metal screen arranged in a radially outer position with respect to the outer semi-conductive layer;
- a single filler layer arranged in a radially outer position with respect to the wire metal screen and interpenetrating within the wire metal screen, the filler layer being made from an extruded elastomeric low smoke zero halogen composition comprising a polyethylene homopolymer and/or copolymer having a density lower than 0.93 g/cm? and a metal hydroxide;
- and
- an outer sheath arranged in a radially outer position with respect to the filler layer and directly contacting the filler layer, the outer sheath being made from a low smoke zero halogen (LSOH) composition comprising a polymer mixture of an EVA polymer and polyethylene homopolymer and/or copolymer having a density lower than 0.93 g/cm3, the polymer mixture being charged with a metal hydroxide and a phyllosilicate clay.
Dependencies are inferred from the claim text.