| 摘要 |
<p>Electrical power, instrument and communication cables constructed with combustible coverings can provide a pathway by which fire might spread. Cable fires within a room or compartment can be arrested by the construction of a properly designed "fire break" placed periodically along a cable run; and cable fire spread between rooms can be arrested by a properly placed "fire stop". Cable runs generally include a cable tray or raceway to contain the cables. An effective fire barrier, e.g., "fire break" or "fire stop" may be constructed in such a cable tray or raceway by filling a portion of the tray or raceway with a gypsum composition comprising gypsum plaster, an inert filler mixture of diatomaceous earth and lightweight expanded aggregate, and very small amounts of glycerin, boric acid and a corrosion inhibitor such as a boron nitride, boron nitrile or mixture of such boron compounds. The fire barrier is formed by placing in a portion of the cable tray/raceway an aqueous slurry of the plaster composition as described above, slurried with water in amounts of about 10 pounds of the plaster composition and 14-16 pounds of water to form a " pseudo-plastic" mass, and filling all of the voids around and beneath cables therein by applying force to the cable tray/raceway, e.g., as by hammering with a rubber mallet.</p> |
