Flame-resistant plenum cable and methods of making

Details Flame-resistant plenum cable and methods of making Flame-resistant plenum cable and methods of making

1984-06-29

1986-08-12

Prescott, A. C.

Electricity: conductors and insulators

Conduits, cables or conductors

Conductive armor or sheath

156 54, 156 56, 174113R, 174121A, 174121SR, 350 9623, H01B 702, H01B 722

Patent

active

046058184

ABSTRACT:
A relatively small pair size cable (20) comprising at least one conductor (22) which is insulated with polyvinyl chloride plastic material is provided with a flame retardant, smoke suppressive sheath system (30). The sheath system has a relatively low thermal conductivity and provides a predetermined delay prior to the thermal decomposition of the conductor insulation. It includes a layer (31) of an impregnated woven glass material which has an air permeability that is sufficiently low to minimize gaseous flow through the layer of woven glass material and to delay heat transfer to the core for a predetermined time. The woven glass layer is wrapped about the core to have a longitudinal overlapped seam and is enclosed by an outer jacket (40) of a fluoropolymer plastic material which is extruded about the woven layer.

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