A device for joining sections of solid-dielectric underground cable comprises conductor extension pieces or ferrules respectively attached to the center conductors of each of the cable sections, conductor inserts installed in a cavity of each of the ferrules, and a conductor clamp for clamping the ferrules together in a predetermined longitudinal arrangement. The conductor clamp comprises a pair of semi-cylindrical shell pieces which, when assembled together, form a modified cylindrical structure having a central aperture for receiving the ferrules. Each conductor insert includes a disk-shaped flange plate on its outer end. Fasteners are used to compress the shell pieces toward one another into secure engagement with the ferrules, so that the ferrules, and the center conductors to which they are attached, are retained in a desired predetermined mechanical relationship. The flange plates of the conductor inserts are larger than the central aperture of the assembled clamp so that the flange plates are longitudinally constrained by the walls of the cavity. As a result, the assembly can withstand large forces in tension and compression which may be produced due to thermal expansion and contraction of the cable.

Cooling rings of resilient thermally conductive material are installed over a current limiting fuse prior to insertion in a canister housing. The cooling rings provide a heat conduction path from the fuse to the canister wall, thereby reducing heat build up within the canister. The cooling rings are provided with recesses to reduce pressure build-up during fuse insertion in a canister.

An electrical switch apparatus comprising at least one set of contacts including a movable contact and a stationary contact, at least one chamber surrounding the contacts, a first support for supporting the chamber, a second support for supporting the stationary contact with respect to the chamber, an adhesive for attaching the first and second supports to the chamber, a non-circular drive shaft, a connection mechanism for coupling the moving contact to the drive shaft, a locating mechanism for securing the connection mechanism along the drive shaft, a coupling mechanism associated with the drive shaft for transmitting rotational energy to the drive shaft, the coupling mechanism having an adaptor that mates with the drive shaft with a clearance between the adaptor and the shaft, and a castable material filling the clearance to form an interface between the drive shaft and the adaptor.

A cable termination assembly for terminating a high voltage current-carrying conductor includes an outer porcelain housing and an inner polymeric liner of low durometer, cast in the housing before insertion of the cable. The liner is bonded to the housing wall to prevent air voids. A metal base member amy be employed and may include an upstanding shielding collar extending part way into the housing and being joined thereto by the cast liner.