The Fire alarm Grades are defined as follows.
Grade A: A fire detection and fire alarm system, which incorporates a fire alarm control panel and indicating equipment conforming to BS EN 54-2, and power supply equipment conforming to BS EN 54-4, and which is designed and installed in accordance with all the
recommendations of sections 1 to 4 inclusive of BS 5839-1:2002, except those in the following clauses, for which the corresponding clauses of this part of BS 5839 should be substituted.
Grade B: A fire detection and fire alarm system comprising fire detectors (other than smoke alarms and heat alarms), fire alarm sounders, and control and indicating equipment that either
conforms to BS EN 54-2 (and power supply complying with BS EN 54-4) or to Annex C of this part of BS 5839.
Grade C: A system of fire detectors and alarm sounders (which may be combined in the form of smoke alarms) connected to a common power supply, comprising the normal mains and a standby supply, with central control equipment.
Grade D: A system providing fire detection in the form of one or more mains-powered smoke alarms, each with an integral standby supply. (The system may, in addition, incorporate one or more mains-powered heat alarms, each with an integral standby supply.)
Grade E: A system of one or more mains-powered smoke alarms with no standby supply. (The system may, in addition, incorporate one or more heat alarms, with or without standby supplies.)
Grade F: A system of one or more battery-powered smoke alarms. (The system may, in addition, also incorporate one or more battery-powered heat alarms.)
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