H - Electricity – 01 – B
Patent
H - Electricity
01
B
337/62
H01B 7/28 (2006.01) H01B 7/18 (2006.01) H01B 7/20 (2006.01) H01B 7/295 (2006.01)
Patent
CA 1135355
P/4002.04 FIRE RESISTANT ELECTRICAL CABLES Abstract of Disclosure An improved electrical cable is disclosed comprising a core assembly including at least one insulated conductor, a hermetically closed tubular metallic sheath concentrically positioned about the core assembly, and a filler material dispersed in, and partially occupying, the spaces between the inner surface of the metallic sheath and the outer surfaces of the core assembly throughout at least a major portion of the length of the electrical cable. The improvement comprises the following combination of features: (i) the metallic sheath tightly engages the core assembly along at least a major portion of the core assembly, thus structurally limiting the hollow or unoccupied spaces within the electrical cable; and (ii) the filler material is comprised of a thermoplastic admixture which absorbs at least a portion of acids and gases resulting from a decomposition of the insulation of said at least one conductor, and expands in volume, upon its temperature exceeding a predetermined limit. Upon the continued subjection of a segment of the metallic sheath to concentrated heat; e.g., a localized fire, at least a portion of the acids and gases resulting from insulation decomposition is absorbed from the filler material positioned within the heated segment and, in combination, the volume of such filler material within the heated segment, expands to provide substantially complete cross-sectional occupation of any hollow spaces within the heated segment, resulting in a structural blockage to the longitudinal flow of acids and gases from within the heated segment into adjacent segments of the electrical cable.
346326
Leuchs Ottmar
Maltz Georg
Gowling Lafleur Henderson Llp
Kabel- Und Metallwerke Gutehoffnungshuette Ag
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