fire alarm category

[Lannielectrical]

Can anybody tell me what a LD3 category B fire alarm system comprises off

Thanks

 

[sparkytim]

LD3 is a system incorporating detectors in all circulation spaces that form part of the escape routes from the dwelling

Grade B is a fire detection and alarm system comprising fire detectors other then smoke alarms, fire alarm sounders and indicating equipment which either conforms to BS 5839-4 or to ANNEX B of this part of BS5839 (BS5839 PART 6)

And that states basically a Grade A and B are equal to systems described in BS5839 Part 1, commercial types that require a Fire alarm panel and monitered Fire resistant cabel system wiring.