Bonded sheath cable with a biaxial stress resisting jacket

Details Bonded sheath cable with a biaxial stress resisting jacket Bonded sheath cable with a biaxial stress resisting jacket

H - Electricity

01

B

337/59

H01B 7/18 (2006.01) H01B 7/20 (2006.01) H01B 11/00 (2006.01) H01B 11/10 (2006.01)

Patent

CA 1172322

- 27 - BONDED SHEATH CABLE Abstract of the Disclosure A cable which is capable of being made in a large pair size and yet which has excellent mechanical properties that maintain its integrity notwithstanding extremes in temperature during installation and shipping as well as during the rigors of installation includes a sheath system having a corrugated steel outer shield that is adhesively bonded to a plastic jacket. The corrugated steel shield which is formed to have a longitudinal overlapped seam that is preferably unsealed encloses an aluminum inner shield that in turn encloses a multiconductor core. Advantageously, the sheath system includes a plastic jacketing material which is capable of resisting biaxial stresses which are aggravated in a bonded sheath system. This results in jacket integrity about the longitudinal seam of the outer shield notwithstanding a notched cross- section and an unsupported bridged portion of the plastic jacket adjacent to the seam. Of additional benefit is a further characterization of the plastic as being one which because of its relatively low elastic modulus at conventional extrusion times and temperatures is caused to substantially fill the corrugations of the outer shield. The jacket plastic forms a surface-to-surface bond with the shield that is sufficient to prevent delamination of the outer shield and the jacket and to prevent buckling of the jacket during exposure to temperature extremes.

394062

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