| 摘要 |
<p>PURPOSE:To attain execution of the method of fireproof construction for a wall or floor without decreasing an electrifying capacity by enlarging a conductor sectional area in a part inserted and a part in the vicinity of this inserted part, relating to the wall or floor, as compared with that in the other part, so that a hot spot phenomenon is prevented from being generated. CONSTITUTION:A bus duct 13 having a part 13b, wherein a conductor sectional area of a part inserted through a partitioning member 11 and of a part in the vicinity of this inserted part is formed larger than a part 13a not inserted through the member 11, is formed. Next, the bus duct 13 is inserted through a bus duct inserting hole 12, and a clearance between the inserting hole 12 and the bus duct 13 is packed with a filler 14 composed of heat insulating material of rock wool or the like. Then, both internal and external surfaces of parts of inserting the bus duct 13 of the partitioning member 11 are interposed by fire resistant partitioning plates 15, 15 of calcium silicate plate or the like. In order to fill up a clearance part between the partitioning plates 15, 15 and the bus duct 13, heat insulating seal materials 16, 16 are additionally provided to be built up. In this way, an electric through member of the bus duct or the like can be suppressed from its temperature rise.</p> |
