CABLE HAVING LIGHTNING PROTECTIVE SHEATH SYSTEM

A communications cable for use in buried environments in an outside plant includes a core comprising at least one transmission medium and a mechanically strengthened, thermal resistant barrier layer disposed about a plastic tubular member. A metallic shield and a plastic jacket are disposed about the barrier. The barrier layer may comprise a tape which is made of a material such as woven glass or an aramid fibrous material, for example, which is resistant to relatively high temperatures, which has suitable strength properties in all directions and at elevated temperatures and which is characterized by properties which cause the barrier layer to impede the passage therethrough of particles which are sufficiently large to cause damage to the core. In a preferred embodiment, the thermal barrier layer also includes provisions for preventing the longitudinal flow of water within the cable. Such a waterblocking capability may be provided by a barrier layer comprising a laminate comprising a high temperature resistant tapeand at least one other tape with a superabsorbent powder therebetween or anothertape which has been impregnated with a superabsorbent material.