CPV code 31300000 designates Insulated wire and cable in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
31300000 sits under 31000000 (Electrical machinery, apparatus, equipment and consumables; lighting) and groups 5 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.