As specified by BS5839-6, a Grade D2 system comprises of one or more mains-powered detectors, each with an integral standby power supply consisting of a user-replaceable battery or batteries. All of the below devices are suitable for use as part of a BS5839-6 Grade D2 fire alarm system.

Grade D2 Systems

As specified by BS5839-6, a Grade D2 system comprises of one or more mains-powered detectors, each with an integral standby power supply consisting of a user-replaceable battery or batteries. All of the below devices are suitable for use as part of a BS5839-6 Grade D2 fire alarm system.
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