Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1994-08-12
1998-05-12
Sough, Hyung S.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
174 48, 52232, 169 48, H02G 304
Patent
active
057509271
ABSTRACT:
A temperature-sensitive, heat-producing article, such as an electric cable, is fire protected by a multi-layered, thin, light weight, and vented arrangement with enhanced low-temperature heat dissipation during normal operation and effective high-temperature heat blocking during a fire. It includes a. an inner layer of heat blocking material chosen from the class of reactive endothermic materials (14), b. a vented, thin, multilayered heat screen (10), c. a gap producing spacer (12), and d. in combination, enhanced conductive, convective, and radiating elements for heat dissipation at low temperatures (11, 12, 41, and 44). The screen (10) includes a plurality of alternating layers of porous, ultra-thin, high-temperature, non-wicking insulating fiber cloths, and high-temperature heat-reflecting metallic porous foils with a layer of metallic wire cloth on the outside, i.e, the side facing the fire. The inner side of the screen (10) is held separated from inner layer (14) by a gap-forming crimped metallic wire cloth (12). The inner layer (14) encloses and is in contact with the protected article (18). The outermost layer, a wire cloth, is connected, through the layers of the heat screen, to the metallic spacer by a plurality of heat conducting wire segments, establishing a heat dissipation path designed to disintegrate during a fire.
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