Plenum cable
AssigneeBelden Wire & Cable Company
InventorsRobert D. Kenny, Douglas O'Brien
Life of this patent
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Abstract
A plenum cable having a plurality of insulated conductors enclosed by a jacket. Each of the insulated conductors or twisted-pair conductors has a dielectric constant that varies .+-.0.25 from any other insulated conductor or twisted-pair conductor. In the preferred structure at least one twisted-pair conductor has flame retardant polyethylene or flame retardant polypropylene insulation and at least one other twisted pair conductor being insulated with fluorinated ethylene propylene, tetrafluoroethylene, or ethylenechloro-trifluoroethylene.
Claims15
A plenum cable having a jacket enclosing a plurality of insulated conductors comprising each conductor being insulated with a type of flame retardant insulating material and said plurality of insulated conductors having at least two types of insulating material at least one or more insulate conductors having one type of insulating material and at least one or more insulated conductors having a second type of insulating material, and each insulated conductor having substantially the same dielectric constant as another insulated conductor wherein said dielectric constant of any insulated conductor varies within only .+-.0.25 from any other insulated conductor.
Dependencies are inferred from the claim text.