An enclosure housing assembly for an electrical switching apparatus is provided. The enclosure housing assembly includes a sidewall assembly, a movable carriage assembly, a ground bus bar assembly and a movable terminal assembly with an extendable conductor assembly. The sidewall assembly includes a number of sidewalls defining an enclosed space. The movable carriage assembly is movable between a withdrawn, first position. Wherein the movable carriage assembly is disposed partially outside the enclosure sidewall assembly enclosed space, and an inserted, second position, wherein the movable carriage assembly is disposed substantially inside the enclosure sidewall assembly enclosed space. The ground bus bar assembly is coupled to the first sidewall. The movable terminal assembly is coupled to the movable carriage assembly whereby the movable terminal assembly moves with the movable carriage assembly. The extendable conductor assembly is coupled to, and in electrical communication with, the ground bus bar assembly.