Cable splice

H - Electricity – 02 – G

Patent

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Details

26/37, 339/47.1

H02G 15/18 (2006.01) B29C 61/06 (2006.01) H01R 4/00 (2006.01) H01R 43/00 (2006.01) H02G 15/00 (2006.01)

Patent

CA 1057373

Abstract A sleeve of polymeric material is disclosed, which is suitable for splicing mine cables. The sleeve has been radially expanded from an original heat-stable form to a form in which it is independently dimensionally heat- unstable and is capable of shrinking in the direction of its original form upon the application of heat alone. It has a tensile strength of at least about 1200 p.s.i. when measured in accordance with ASTM D 2671 using a jaw separation speed of 20 ? 2 inches per minute, a maximum stiffness of 10,000 p.s.i. when measured according to ASTM D 747 and a dielectric strength of at least 200 volts per mil determined in accordance with ASTM D 149 or a dielec- tric breakdown voltage of at least 6,000 volts when measured in accordance with ASTM 2671. At least part of the inner surface of the sleeve is provid- ed with an adhesive. Such sleeves allow the splicing of electrical cables without removing them from the mine, as was done hitherto, and also give a more rugged splice than hitherto. The splice is though, flexible and easily formed. A repair kit may comprise at least one inner sleeve having the specified di- electric breakdown voltage and an outer sleeve having the specified dielectric strength. A splice is made by placing an inner sleeve over a broken conductor in which a joint has been made, heating it, placing around the covered joint an outer sleeve which is long enough to overlap the outer cable insulation and, finally, heating the outer sleeve.

138599

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