This document specifies the requirements for compatibility and connectability assessment of system components that either comply with the requirements of EN 54 or with a manufacturer's specification where there is no EN 54 standard. This document only includes system requirements when these are necessary for compatibility assessment. This document also specifies requirements for the integrity of the fire detection and fire alarm system when connected to other systems. This document does not specify the manner in which the system is designed, installed and used in any particular application. This document recognizes that it is not practical to assess the compatibility or connectability of components in all possible configurations. Methods of assessment are specified to reach an acceptable degree of confidence within pre-determined operational and environmental conditions. This document specifies requirements related to compatibility and connectability assessment methods and tests for the system components. This document is applicable to systems where the components are connected to control and indicating equipment and where the components are interconnected by electrical wires. For fire detection and fire alarm systems that use other means of interconnection (for example optical fibre or radio frequency links), this document may be used as guidance. NOTE Other European Standards are expected to cover the requirements of the other systems to which the fire detection and fire alarm system may be connected.