Electricity: conductors and insulators – Feedthrough or bushing – Compression
Patent
1983-06-09
1985-02-05
Lee, John
Electricity: conductors and insulators
Feedthrough or bushing
Compression
174121R, G02B 516, H01B 714
Patent
active
044975376
ABSTRACT:
In an electric and/or optical cable for use suspended under water at depths of at least 1,000 m or for direct burial in the ground, each core is surrounded by a water-impermeable barrier comprising a cushioning layer of elastomeric material and, a longitudinally applied, transversely folded metal tape carrying on its outer surface a plastics coating and an outer plastics sheath is bonded to the plastics coating of the water-impermeable barrier. The metal tape has a helically extending corrugation formed by winding around the folded tape, prior to application of the plastics sheath, a plastics coated terylene filament which is applied under such a tension as to form the helical corrugation and to cause elastomeric material of the cushioning layer to fill the trough of the helical corrugation in the inner surface of the folded tape, the plastics coating on the terylene filament being bonded to the plastics sheath. Six cores are laid up around a central tensile member comprising a multiplicity of non-metallic filaments of high tensile strength so arranged that each filament lies substantially parallel to the axis of the cable, the assembly of cores being surrounded by a binding layer of helically wound tin-bronze tape and a serving layer of helically lapped polypropylene tape.
REFERENCES:
patent: 2225298 (1940-12-01), Cook
patent: 4227770 (1980-10-01), Gunn
patent: 4375313 (1983-03-01), Anderson et al.
BICC Public Limited Company
Lee John
LandOfFree
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