POWER-CABLE DISASTER-PREVENTING SHEET AND CABLE LINE USING IT

摘要

PROBLEM TO BE SOLVED: To obtain a power-cable disaster-preventing sheet whose allowance with reference to an accident can be increased and whose application limit to an actual line is reduced by a method wherein a plurality of sleeve-shaped sheet bodies whose diameter is larger than the outside diameter of a power cable are piled up and their surface is coated with a nonflammable polyvinyl chloride or silicone rubber resin. SOLUTION: A power-cable disaster-preventing sheet 6 is formed to be a sleeve shape whose diameter (ϕ500mm) is larger than the outside diameter of a power cable 1, it is formed so as to cover the power cable 1, and it is flexible. In addition, the sheet 6 is formed in such a way that three or four sheet bodies 7 are piled up so as to be sewn together and that a coating layer 8 which is composed of a nonflammable polyvinyl chloride or silicone rubbler resin is formed on their outermost face so as to be set to an airtight state which prevents not only the circulation of the air but also the outflow of oil or smoke. Every sheet body 7 is an aramid sheet which is formed by weaving aramid fibers which are provided with high strength and with heat resistance, and its specifications are decided in such a way that its warps and its wefts are respectively at 300 deniers.