Improved flexible fireproof cable

Abstract

The invention discloses an improved flexible fireproof cable. The improved flexible fireproof cable comprises a cable core formed by twisting a plurality of thread cores. A filling layer is arranged in the gap of the cable core. The cable core is wound with a fireproof inflaming retarding layer, a second fireproof separation layer and a low smoke zero halogen sheath layer. Each thread core is composed of a copper conductor, a fireproof insulation layer, a first fireproof separation layer and a color separation insulation layer, wherein the copper conductor is wound with the fireproof insulation layer, the first fireproof separation layer and the color separation insulation layer in sequence. As the thread cores and the cable core are provided with the fireproof separation layers respectively, the fireproof level and fire resistance quality of the cable in a fire disaster are improved. By means of the structure, dual protection on every insulation thread core and the whole cable core can be achieved, short circuit caused by disengagement of the insulation layers in the burning process is avoided, and the capacity of maintaining circuit integrity in the burning state is achieved more perfectly.

Description

technical field [0001] The invention belongs to the field of power cables, and in particular relates to an improved flexible fireproof cable. Background technique [0002] As we all know, the flame retardancy and combustion resistance of cables are important in use. In the past, fireproof cables used mineral insulation such as magnesium oxide and metal copper sheaths. Due to various restrictions, continuous large-length production could not be performed, and It cannot be bent, and it is not easy to install and lay. Therefore, flexible fireproof cables have appeared. In contrast, they can be produced continuously in large lengths, and the cross-section is not limited. The fire resistance grade not only meets the requirements of the national standard GB / T 19666-2005 and the industry standard GA 306.2-2007, but also meets the requirements of Class A at 650°C for 3h, Class B at 750°C for 3h, Class C at 950°C for 3h, Class S as stipulated in British BS6387 Combustion requirement...

AI Technical Summary

Problems solved by technology

[0003] After searching, it is found that some cable peers have invented a variety of flexible fireproof cables. Improvements have been made to make it a flexible structure, but they all use a copper sheath structure, which seriously affects the bending radius of the cable. Although the ratio has been significantly improved, there is still a big difference in the bending radius and fireproof quality. room for improvement

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