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ApplicationNo. 739537 filed on 08/02/1991
US Classes:174/102SC, Semiconducting174/36, Conductor only174/105SC, Semiconducting174/106SC, Semiconducting174/115Dissimilar or auxiliary conducting elements
ExaminersPrimary: Nimmo, Morris H.
Attorney, Agent or Firm
Foreign Patent References
International ClassH01B 007/34
AbstractA static dissipative electrical cable which eliminates the build-up of triboelectric charging by having a carbon loaded outer jacket which is a semiconductor for draining off triboelectric charges. In one embodiment, the jacket material is a 1 megohm/ft semiconductive extrudable Teflon polyfluorinated alkoxy (PFA) resin static-dissipative polymer of low carbon-black loading (3-4% by weight) having very stable electrical/mechanical properties against temperature excursions, thermal/environmental shock and aging. The cable is designed with a double-clad aluminum/mylar foil shield that allows electrical commoning between inner and outer clads of the foil and control of the interface between semi-conductive static-dissipative jacket and the foil shield to yield a jacket-to-ground wire resistance value between 100 kilo-ohms and 50 megohms. The latter insures adequate draining of triboelectric charges to ground, while maintaining a high resistance path to any ground loop current from neighboring cables or frame ground.