FireNet Community
September 25, 2017, 05:25:39 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: It is with deep regret that the Webmaster, Colin Simpson, and I have to inform the forum that Alan Kurnatowski (Kurnal) passed away on the 17th April.
Colin T & Colin S have provided an obituary in the fire safety forum
 
   Home   Help Search Login Register  
Pages: [1]
  Print  
Author Topic: Alarm in large dwelling  (Read 185 times)
lyledunn
Sr. Member
****
Posts: 320


« on: July 17, 2017, 08:56:57 AM »

The spec given on the plans for a relatively large dwelling was Grade A Category LD2. The house has a small basement garage, a ground floor of 250m2 and a slightly smaller first floor at 200m2. The electrical contractor fitted a standard Grade D Category LD2 system as the electrical layout was agreed on site with the home owner without reference to the architects plans. Any way, BC will not sign off as they insist that the Grade of system is changed to A. That system requires standard fire resisting cables. Of course the house is finished and decorated with no way of introducing new cabling. Could do wireless but I am not a fan (yet). The homeowner and contractor have asked me to assist. I presented a compromise where detector heads would be changed to allow panel to be fitted. Fire resistant cabling to a sounder on each floor via a service duct.
There is no special risk here but BC adamant that fire resistant cable is employed. I feel this to be unreasonable. Would appreciate your comments.
Logged
nearlythere
Hero Member
*****
Posts: 4262



« Reply #1 on: July 17, 2017, 02:14:49 PM »

Why does it want grade A for 3 storey dwelling Lyle?
Logged

We're not Brazil we're Northern Ireland.
AnthonyB
Firenet Extinguisher Expert
Hero Member
*****
Posts: 2165



WWW
« Reply #2 on: July 17, 2017, 09:37:08 PM »

Because they will have consulted Table 1 of BS5839-6:2013 which for Single-family dwellings with one or more floors greater than
200 m2 in area requires a Grade A LD2 system where there are two or more storeys.

The OP describes a house of basement, ground and first floor and the ground floor is over the 200m2 limit which bumps it up from Grade D to Grade A
Logged

Anthony Buck
Fire Safety Technical Lead at a BAFE SP205 accredited consultancy

Extinguisher/Fire History Enthusiast

Fire Extinguisher Facebook Group:
http://www.facebook.com/group.php?gid=65...415&ref=ts
http://www.youtube.com/user/contactacb
https://uk.linkedin.com/in/anthony-buck-36b9572
lyledunn
Sr. Member
****
Posts: 320


« Reply #3 on: July 18, 2017, 07:47:55 AM »

Anthony is correct although our Technical Booklet E requires only a Grade B Category LD2. That doesn't really help. I am referring BC to Annex B of 5839-6 2013 which in B 6.2 states that adequate protection may be had without following all the requirements of BS5839-1. I don't blame BC for taking a hardline stance but I fail to see why an extra 50m2 will make any significant difference. If I knew the thinking behind the 200m2 rule I would be in a better position to express a view.
Logged
Pages: [1]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!