These include plenum cable and {TAIL ~ rising cable}, in which {HEAD ~ 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 the PVC formulation which acts as both insulation and protective sheathing; and optical fibres 
in
These include plenum cable and { TAIL ~ rising cable } , in which { HEAD ~ 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 the PVC formulation which acts as both insulation and protective sheathing ; and optical fibres
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