Injection die fire-resistant cable junction body

摘要

PURPOSE: To make it possible to easily form a fire-resistant layer at a branch connecting portion by providing an injection type fire-resistant layer consisting of mixed materials of a particular composition having an oxygen index higher than a specified value placed on a conductor or sleeve at a cable connecting portion. ;CONSTITUTION: A T-shaped branch connecting pipe 6 is constituted by branch conductor connecting pipes 6a, 6b and 6c. And a filling type fire-resistant layer 7 is formed by using an injection mold connecting method on the outer periphery of the branch connecting pipe 6, an insulation layer 8 made of polyethylene or the like is formed on said layer, and an injection type fire-resistant cable branch connecting unit is obtained. In this case, the injection type fire-resistant layer is a monomer containing ethylene and carboxyl group, or a copolymer alone with a derivative of said monomer, or ethylene-alkyl acrylate copolymer alone, or a mixture of 100 part in weight of the blend with these polyolefin plus 150 to 300 part of metallic hydroxide plus more than 10 part of calcium carbonate, talc, clay and calcium silicate having the oxygen index higher than 40.;COPYRIGHT: (C)1995,JPO