Typical Construction of a 1-core armoured cable Conductor: Plain circular compacted copper or aluminium conductor Conductor screen: Extruded semiconductive compound Insulation: Extruded cross-linked polyethylene ( XLPE) rated 90° C Insulation screen: Non-metallic part - extruded layer of semiconductive compound metallic part - copper tape of 0.1mm nominal thickness Bedding: Extruded PVC or PE compound Armour: Round hard drawn aluminium wires applied helically over the bedding Outer sheath: Extruded PVC or PE compound Typical Construction of a 3-core armoured cable Conductor: Plain circular compacted copper or aluminium conductor Conductor screen: Extruded semiconductive compound Insulation: Extruded cross-linked polyethylene ( XLPE) rated 90° C Insulation screen: Non-metallic part - extruded layer of semiconductive compound metallic part - copper tape of 0.1mm nominal thickness Bedding: Extruded PVC or PE compound Armour: Galvanized steel wire applied helically over the bedding Outer sheath: Extruded PVC or PE compound