A ground block connector is provided by forming a slot in a protrusion of a housing for an electrical device. A compression bolt is screwed into a threaded hole in the protrusion into the slot, for captively retaining a U-shaped compression electrical contact in the slot, whereby movement of the screw in one direction moves the contact toward the bottom of the slot, for compressibly retaining an end of a ground wire between the bottom of the contact and bottom of the slot.