BS 7273-6:2019 pdf free.Code of practice for the operation of fire protection measures.
General recommendations for interface connections COMMENTARY ON CLAUSE 4 Interfacing is required when a fire detection and fire alarm system is connected to ASE. Common applications for such interfaces are described in Annex A. It is necessary to ensure that the two systems or equipment do not jeopardize each other through electrical interference or loading effects. The power taken by the other equipment needs to be accounted for by providing suficient power capacity, providing additional power supplies or ensuring that the interconnection does not allow excessive loading. It is likely that the ASE will need to be tested regularly to verify that it is operating correctly. There might need to be disablement facilities to prevent the ASE from being operated during regular testing of the fire detection and fire alarm system and test facilities, to allow the organization responsible for the ASE to activate the ASE from the fire detection and fire alarm system at appropriate times of regular servicing. In some cases, it might not be practicable to test the ASE regularly. In these cases, it might be necessary to be able to confirm connection to the ASE and to confirm that the ASE is capable of operating correctly, e.g. by verifying that the transmission path is fault-free and that the necessary power supplies are operating correctly. In some cases, it might be necessary to ensure that the interface between the systems is fail-safe, ie. that in the event of one of the systems failing to be able to operate, the output operates automatically to place the interfaced ASE into a safe state (normally, the same state as initiated by a fire signal).Some fire detection and fire alarm systems can provide a pre-alarm warning. This warning is primarily intended to enable investigation of conditions that might give rise to a false alarm. It is not normally appropriate, therefore, for a change of state of ASE to be actuated in the event of a pre-alarm warning, unless that is the intended function of the ASE.BS 7273-6 pdf download.