Abstract: Electrical termination and connector structures for electrical cable, and a penetrator for electrical power and/or signals through a pressure barrier, provide, in different embodiments, mechanical attachment to the cable and to individual conductors of a multi-conductor cable; and provide fluid-tight seals to protect the terminated and interconnected conductors from adverse ambient gases and liquids. A molded elastomeric body, in one embodiment, provides the rugged fluid-tight seals. The electrical termination and connector structures withstand cycled pressure and temperature environments, and include a mechanism for restraining the extrusion or other displacement of cable insulation under conditions of cycled pressure and of temperature. The structures also accommodate axially adjustable installation and differential axial expansion and contraction.