Abstract: This invention relates to a cross connect wiring block also known as a 110 connector system. This type of wiring block typically includes slotted beam contacts to electrically interconnect a set of first conductors to an associated set of second conductors. The wiring block essentially comprises an elongated housing containing plural cavities defined by opposing walls, where each cavity receives a slotted beam contact longitudinally positioned within the cavity. The improved features of this wiring block are the provision that each first conductor consists of a metal core and an outer layer of insulation, where the diameter of the conductor is a predetermined diameter, and that opposing walls of the cavities include plural pairs of longitudinally directed projections, where the distance between the projections of a given pair is less than the predetermined diameter. This ensures greater wire retention of the conductor.