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From a sprinkler contractor in the UK - We have a British Standard BS 9251 which is based (loosely) on your NFPA 13 D/R for the use in houses, flats and care homes and so on. One area which is very grey to us and not included in the design standard is the distance from obstructions such a pendant lampshade which lower than the ceiling or a smoke detector or emergency light fitting.
I know most contractors are using 300mm (1 ft) as a minimum from a pendant drop light fitting but then you ask them why no one can tell you. for other obstruction such as a smoke detector many any using 4 times the depth as a method. For beams and larger continuous obstructions, it's much easier as most just use a bean rule in EN BS 12845 (our equivalent NFPA 13). I would be very interested in understanding the approach which you take for such things and very much looking forward to your assistance. Posted anonymously by a member for discussion. Discuss this | Subscribe.
2 Comments
Dave L.
11/15/2018 10:59:25 am
Greetings. I'd be curious to take a look at the British Standards. Both NFPA 13D & 13R have sections titles "Obstructions to Residential Sprinklers." These include guidance for positioning sprinklers relative to obstructions, such as pendent sprinklers being located at least 3 ft (914 mm) from obstructions such as ceiling fans and light fixtures (measured from the center of the obstruction). There are similar provisions for things such as continuous obstructions (beam rule) and allowable "shadow area" in terms of floor coverage. Manufacturers' data may contain relevant obstruction data. Wile on the contracting side, I have found that due to the sometimes fluid nature of residential construction, it is important that the fitters/installers are also aware of these basic rules.
Michael
2/17/2025 12:38:48 am
my landlord installed the sprinkler system in my flat 3 or 4 years ago. I have a projector screen mounted just above the sprinkler head and slightly over the cover, and about 3 inch forward of the wall. The screen was there before the sprinkler head and no one has said anything during installation, or on each inspection, then I had an inspection a couple of weeks ago, and I have been told to take it down, because it slightly covers the top of the cap. what are the spacing rules for the british standard? I can't find any info anywhere for it. thanks. Leave a Reply. |
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