Gypsum fire barrier for cable fires

Details Gypsum fire barrier for cable fires Gypsum fire barrier for cable fires

C - Chemistry, Metallurgy

04

B

337/126, 261/73

C04B 11/00 (2006.01) C04B 28/14 (2006.01) H01B 7/28 (2006.01)

Patent

CA 1150326

GYPSUM FIRE BARRIER FOR CABLE FIRES Abstract of the Disclosure 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 the 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.

359469

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