CPV code 45317300 designates Electrical installation work of electrical distribution apparatus in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45317300 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 45317000 (Other electrical installation work).