life inherent purposes, radio receivers used in such systems should be of Category 1 standard. Systems for use during construction can be wireless or mechanical. In the United Kingdom, interconnecting wireless systems are recommended for timber-framed construction. European Standards Fire detection and alarm products placed on the market within the European Union must, following Regulation (EU) No 305/2011, conform to the European harmonized technical standard EN 54 Fire Detection and Fire Alarm Systems. EN 54 part 11 is the section of the mandatory standard relating to manual call points. European Committee for Standardization (CEN, French: ) is responsible for the development and maintenance of the standard, as part of its remit for developing harmonized European standards for free movement of goods in the European Union countries. The EN 54 certification of each device has to be issued annually, and for products of this nature must be issued by a notified body following the stringent testing procedures outlined within the standard. If an EN 54 certificate is over one year old, it has expired and it is not a valid certificate. Manufacturers can not sell or install the device with expired certification in any country of the European Union. See also Fire safety References External links Active fire protection Fire detection and alarm de:Brandmelder#Handfeuermelder ja:自動火災報知設備#発信機