Construction Conductor: Plain circular compacted or sector stranded copper or aluminium conductor Insulation: Extruded cross-linked polyethylene ( XLPE) rated 90° C PVC rated 70° C Colour for core identification Single core - Red ( black on request) Two core - Red & Black Three core - Red, Yellow & Blue Four core - Red, Yellow, Blue & Black Assembly: Two, three or four insulated conductors are laid up together, if necessary filled with non-hygroscopic material compatible with the insulation. The filling may be omitted provided the outer shape of the cable remains practically circular and no adhesion occurs between cores and sheath. Bedding: Extruded PVC or PE compound Armour Single core - Round hard drawn aluminium wires applied helically over the Bedding Multi core - Round galvanized steel wires applied helically over the bedding Outer sheath: Extruded PVC or PE compound