The conductor is made of electrolytic grade, bright annealed bare solid copper conductor of 0.4/0.5 mm diameter and is insulated with a special grade polyethylene compound on the latest state-of-the-art extruders. The cores are twisted together with a uniform lay on a special purpose imported machine, according to the color code to form pairs. The pairs are bunched together in such a manner so as to minimize cross talk. The cable is then jacketed with a specially formulated PVC compound with fire retarding properties. A nylon rip cord provides an effective means of slitting the jacket without damaging the insulation.