These include plenum cable and rising cable, in which one or more current carriers is surrounded by insulation and the whole is surrounded by PVC sheathing; electric wires in which one or more current carriers are surrounded by {HEAD ~ the PVC formulation} which acts as both insulation and {TAIL ~ protective sheathing}; and optical fibres 
These include plenum cable and rising cable , in which one or more current carriers is surrounded by insulation and the whole is surrounded by PVC sheathing ; electric wires in which one or more current carriers are surrounded by { HEAD ~ the PVC formulation } which acts as both insulation and { TAIL ~ protective sheathing } ; and optical fibres
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