Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1991-08-02
1993-06-01
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
174 36, 174105SC, 174106SC, 174115, H01B 734
Patent
active
052162044
ABSTRACT:
A 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.
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Dudek Thomas J.
Hallee Edward C.
Messina Benedicto U.
Washo Basil D.
Weiner Joel A.
Gonzalez Floyd A.
International Business Machines Corp.
Nimmo Morris H.
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