Bagge
Mechanical
- Mar 11, 2008
- 32
I am a Danish Sprinkler Engineer. In Europe, we do not use the NFPA 13 rules as primary – but are allowed to if wanted. The NFPA 13 is much more flexible and stays up to date with the development of the new sprinkler types which the European rules does not. Therefore I am beginning to learn the specific in the NFPA 13 – very interesting.
In below I have pointed out a table in the CEA rules. I am interesting how the NFPA 13 relate to that? Of course, I am also reading in the NFPA 13, and it seems it is all different in the NFPA 13. It depends whether or not the material in the concealed space is combustible, right?
Regarding electrical cables – I can not find anything in the NFPA 13. Will I have to protect cable trays if I use the NFPA 13 rules?
“5.4 Protection of concealed spaces
If the height of the concealed space at roof and floor exceeds 0,8m, measured between the underside of the roof and the top of the suspended ceiling or between the floor and the underside of the raised floor, these spaces shall be sprinkler protected.
If the height of the concealed space at roof and floor is no greater than 0.8 m, the spaces shall be sprinkler protected only if they contain combustible materials or are constructed with combustible materials. Electrical cables with voltage less than 250V, single phase, with a maximum of 15 cables per tray, are allowed.
The protection in the concealed space shall be to LH when the main hazard class is LH and OH1 in all other
cases.”
In below I have pointed out a table in the CEA rules. I am interesting how the NFPA 13 relate to that? Of course, I am also reading in the NFPA 13, and it seems it is all different in the NFPA 13. It depends whether or not the material in the concealed space is combustible, right?
Regarding electrical cables – I can not find anything in the NFPA 13. Will I have to protect cable trays if I use the NFPA 13 rules?
“5.4 Protection of concealed spaces
If the height of the concealed space at roof and floor exceeds 0,8m, measured between the underside of the roof and the top of the suspended ceiling or between the floor and the underside of the raised floor, these spaces shall be sprinkler protected.
If the height of the concealed space at roof and floor is no greater than 0.8 m, the spaces shall be sprinkler protected only if they contain combustible materials or are constructed with combustible materials. Electrical cables with voltage less than 250V, single phase, with a maximum of 15 cables per tray, are allowed.
The protection in the concealed space shall be to LH when the main hazard class is LH and OH1 in all other
cases.”