Figure 8 thermoplastic-insulated and jacketed telephone cables

Figure 8 plastic-insulated telephone cables, both shielded and nonshielded, have been developed incorporating a jacketed messenger connected to the cable jacket by an integral web. Field trials and laboratory tests have shown that jacketed multiwire messenger must be sealed to provide corrosion resistance. This figure 8 construction facilitates time-saving by the simultaneous placing of cable and messenger using substantially the same equipment and practices as conventional cable. The non-shielded type provides improved mechanical and electrical characteristics over that of multipair distribution wire (MDW).