The EN 50173 series of standards are a series of European Standards for generic cabling in different types of premises. In the UK these are published as BS EN standards available to purchase by following the links
EN 50174-1 is intended to be used by personnel during the specification phase of the installation, together with those responsible for the quality planning and operation of the installation. It contains requirements and guidance for the specification and quality assurance of the information.
Parts 2 and 3 of BS EN 50174 are intended to be used by the personnel who are directly involved in the planning aspects (of the specification phase) and the installation phase. BS EN 50174-2 is applicable inside buildings and BS EN 50174-3 is applicable outside buildings.