Patent ID: 7378595
Filing Date: 2008-05-27
Classification: H01B

Abstract:
1. A fully safely operating fire resistant electric cable, said electric cable comprising a plurality of electrically conductive wires, wherein said electrically conductive wires are arranged adjoining with one another, each said electrically conductive wire comprising a copper wire coated by a first layer including a glass fiber strip, a second mica layer glued on said first layer, a third glass thread braid reinforcing layer applied on said second mica layer, said third layer being impregnated by a polyurethane resin providing said cable with a required mechanical strength, and being coated by a fourth extruded insulating elastomeric layer, said coated wires being further coated by a fifth layer made of a copper strip, said fifth layer being in turn covered by a sixth layer made of a glass strip, thereby as said electric cable is subjected to a direct flame with a consequent temperature variation from 750°C. to 930°C., said electric cable provides a safe continuous current flow for a time period from 1 to 2 hours.