Abstract: An electrical connector assembly, a protective enclosure therefor and a running cable bridging adapter system which may use one or both of such components are disclosed. The connector assembly includes a pair of connectors electrically coupled back to back and mechanically secured in such relation by a protective support medium, such as epoxy, with at least one bolt receiving aperture extending through the support medium to facilitate compact stacking and mounting of plural connector assemblies in several alternative arrangements within the protective enclosure. The protective enclosure also includes a mounting plate having predetermined arrays of mounting points formed as pre-stressed punch-outs for enabling securance of the member and its supported connector assemblies to various electrical junction boxes or the like each having its own distinctive array of plural mounting points.