What is a Unique Reference Number (URN)?

A URN is a unique reference number assigned by the police to a security system. It flags to the police properties that will receive immediate Police response should a verified alarm signal be triggered.

A URN can be awarded to security systems that are installed, maintained and monitored by NSI approved companies, and meet the rigorous requirements of the National Police Chiefs Council (NPCC), these requirements demand amongst others that each system must be certificated to professional industry standards (PD 6662 & BS 8243 or BS 8418) and that each system must be regularly professionally maintained to ensure their reliability and keep false alarms to a minimum.