Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1983-12-19
1985-07-30
Grimley, A. T.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
174102SC, 174106SC, 174110FC, 219301, H01B 902
Patent
active
045323755
ABSTRACT:
An improved power cable for a heating system that utilizes the skin effect of alternating current, and a method and apparatus for joining lengths of the improved cable. In one embodiment, the cable includes a stranded copper conductor (20) surrounded by a semiconductive layer (22) formed by carbonized tetrafluoroethylene (TFE) tape which is surrounded by a primary insulation layer (24) formed by pressure extruded, perfluoroalkoxy resin (PFA), the thickness of which is determined by an equation that considers the eccentric positioning the power cable in a heat tube (14). In a second embodiment, the cable comprises a central conductor (30) surrounded by a semiconductive layer (32), followed by a primary insulation layer (34) formed by pressure extruded PFA. A shield layer (36) formed by a layer of semiconductor material (38) and several helically wrapped drain wires (40) surrounds the primary insulation layer. A protective PFA jacket (42) is pressure extruded over the shield layer.
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Parman David G.
Weitzel Harold B.
Grimley A. T.
Nimmo Morris H.
Ricwil, Incorporated
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