Method of making a heating device for utilizing the skin effect of alternating current
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United States of America Patent
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Mar 13, 1984
Grant Date -
N/A
app pub date -
Oct 22, 1981
filing date -
Oct 22, 1981
priority date (Note) -
Expired
status (Latency Note)
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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. Lengths of the improved cable are joined by first removing predetermined portions of the insulating and semiconductor layers from a terminal end (50) and a feed end (52) of respective cable lengths. The exposed conductors (30') are mechanically joined and covered by a spirally wrapped carbonized TFE tape (60). An insulating layer (62) is formed over the junction by spirally wrapping uncured, nonadhesive tetrafluoroethylene tape with a 50% overlap and then heat fusing the layer. Shield extensions (66), (68) are formed by spirally wrapped, carbonized TFE tape that extend into noncommunicating, isolated overlapped relationship from the respective shield layers (38) of each cable end. The entire splice is covered with a layer of insulation (73) formed by uncured, nonadhesive TFE tape which is subsequently heat fused. The drain wire (40) from the terminal end is grounded to the heat tube.
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