Electric power cables
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United States of America Patent
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-
Apr 10, 2001
Grant Date -
N/A
app pub date -
Apr 21, 1999
filing date -
Sep 30, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric power cable of the kind having at least one metallic conductor, optionally conductor screen of semiconductive material, and insulation all enclosed in an earth screen having wires or narrow tapes and a sheath comprising polymeric material is characterised by a sheath construction comprising a first extruded polymeric layer which encloses the earth screen of the cable without filling the gaps between the components thereof (the wires or strips). A second extruded polymeric layer encloses the first and a moisture barrier laminate is located between them and bonded to both of them. The laminate has a metal foil layer coated on each of its major faces with a polymeric material compatible with the material of the extruded layer it contacts. This increases the resistance of the cable to impact, compared with constructions in which a moisture barrier foil layer is applied directly over the screen wires, and allows the cable to be used in applications that hitherto required a metal sheath.
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