Grade B: a fire detection and fire protection including smoke detectors, alarm sounders and fire panel control and indicating equipment which either conforms to BS EN 54-2 (power supply to BS EN 54-4) or to a simpler type laid out in annexe C of BS 5839-6.
Grade C: Is not a fire alarm system as we know it and consist of fire detectors and sounders (which may be combined in the form of smoke or heat alarms) connected to a common power supply with both 240v mains and a standby power supply, with an element of central control – for example a small dedicated fire control panel.
Both systems will require maintenance, Grades A and B will require a fire alarm maintenance contract in accordance with BS5839-1. Grades C will not require a fire alarm maintenance, unless there is a fire alarm control panel, otherwise it should be maintained on an annual basis.
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