CPV code 31730000 designates Electrotechnical equipment in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
31730000 sits under 31700000 (Electronic, electromechanical and electrotechnical supplies) and groups 1 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.