Fully safely operating fire resistant electric cable

Abstract

A fully safely operating fire resistant electric cable comprises a plurality of electrically conductive wires, to which is applied a layer comprising a glass fiber strip with a mica layer glued thereon. The main feature of the invention is that the electric cable further comprises a glass thread braid reinforcing the glass fiber and mica strip.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristics and advantages of the present invention will become more apparent hereinafter from the following disclosure of a preferred, though not exclusive, embodiment of a fully safely operating fire resistant electric cable, which is illustrated, by way of an indicative, but not limitative example, in the accompanying drawings, where:

FIG. 1 is a schematic view showing the cable electric wires arranged adjoining one another;

FIG. 2 shows the cable electric wires after having applied the glass fiber-mica strip thereto;

FIG. 3 shows the strip on which the reinforcement glass thread braid has been applied;

FIG. 4 shows the electric cable with the extruded insulating elastomeric layer;

FIG. 5 shows the electric cable to which a copper strip and a glass fiber strip layer has been applied; and

FIG. 6 shows a perspective view of the electric cable with an outer sheath layer applied thereto.

Claims

1. A fully safely operating fire resistant electric cable, comprising a plurality of electrically conductive wires, on each of which is applied a layer including a glass fiber strip, thereon a mica layer is glued, characterized in that said electric cable comprises moreover a glass thread braid reinforcing said glass fiber and mica strip.

2. An electric cable, according to claim 1, characterized in that said glass thread braid is impregnated by a polyurethane resin.

3. An electric cable, according to claim 1, characterized in that said braid encompasses each individual wire of said cable.

4. An electric cable, according to claim 1, characterized in that said braid encompasses a wire beam of said cable.

5. An electric cable, according to claim 1, characterized in that said electric cable further comprises a combined layer, made of a copper strip and a glass strip.

6. An electric cable, according to claim 5, characterized in that said glass strip is made of a glass thread woven with a high beating density and having a thickness from 0.15 and 0.50 mm.

7. An electric cable, according to claim 6, characterized in that said copper strip has a thickness from 20 to 50 microns.

8. An electric cable, according to claim 6, characterized in that said copper strip has a length from 30 to 100 mm.

9. An electric cable, according to claim 1, characterized in that each conductive mica stripped conductive wire of said electric cable has been individually controlled by a controlling testing apparatus.