BS5839 - part 1 and part 6 systems

[kurnal]

I am confused by table 1 on page 55 of the new guide to sleeping accommodation. What is the difference between a grade A LD2 system under part 6 and an L2 system under part 1?

Heres an extract from the key to the table:

"Grade A LD2 an automatic fire detection system (designed for dwellings and based on a BS 5839-1
system) with detectors sited in escape routes (including rooms that open on to escape routes)
and in rooms or areas that present a high fire risk to occupants, detailed in BS 5839-6"


I think its the grade A bit that introduces the confusion. ( or just me being thick). I am quite happy with the concept of Part 6 systems lower grade systems based on linked detectors and even simple panels  but when we get to A grade stuff with panels needing to comply with  BSEN54  then why do we need this category?

[Wiz]

Special K,
Is it quite simply that they don't want to direct someone who has purchased Part 6 to find out what they need in a 'dwelling' to then also have to buy Part 1 to find out what is specifically required?

[Graeme]

Grade A systems are for houses over a certain size.

Part 6 LD2 is escape routes and other areas of high risk.

[kurnal]

But why have they created grade A in part 6  instead of just recommending a Part 1 L2 system for houses over a certain size?
Wizzibix- you may have a point but it would be a first if the BSI wanted to save someone buying another of their documents.  hey I hope we aint creating another wacky thread- it could turn into a  a long cereal again...

[jokar]

Simple Part 6 = dwellings because CT wrote it that way and Part 1 =commercial premises.  They may be the same but never the twain shall meet.

[Graeme]

But why have they created grade A in part 6  instead of just recommending a Part 1 L2 system for houses over a certain size?
Wizzibix- you may have a point but it would be a first if the BSI wanted to save someone buying another of their documents.  hey I hope we aint creating another wacky thread- it could turn into a  a long cereal again...

becuase there are a few differences regards audible alarms,alerting deaf persons,manual call points and radio systems.

[Wiz]

Krispie,
I agree with the postings of jokar and GM that indicate that the slight differences in the Recommendations comes down to the overall consideration of typical requirements between a 'domestic' and a 'commercial' type premises. It's all a bit of a porridge and often makes me want to destroy my copy of 5839 in the shreddies.

[kurnal]

Thanks Graeme - I will have to have a good read and spot the differences.  Just goes to show I dont know oat about it.
Alpen another email when I have digested all the implications.

The trouble is Jokar that the two do meet in the key to the table in the guide. And whilst I accept Greames point I still dont really know whether on completion I would have installed a part 6 system to a part 1 standard or a part 1 system to part 6 standard. What would the commissioning certificate say?

[Graeme]

just quickly as i am going out

an examle of difference with mcp's is P6 does not require them in certain circumstances.

[Graeme]

Kurnal

Refer to page 9   7.1 and page 16 and 17 table 1 on BS5839-6 2004

g