Smoke detectors in beam pockets 1

[MMa7rous]

What is meant by beam pocket as stated in NFPA 2002 5.7.3.2.4?

 

[cdafd]

check 5.6.5.3

depends on width and depth of beams and hieght of ceiling

 

[cdafd]

from 2010 nfpa 72

17.7.3.2.4.2 For level ceilings, the following shall apply:


(1)
For ceilings with beam depths of less than 10 percent of the ceiling height (0.1 H), smooth ceiling spacing shall be permitted. Spot-type smoke detectors shall be permitted to be located on ceilings or on the bottom of beams.


(2)
For ceilings with beam depths equal to or greater than 10 percent of the ceiling height (0.1 H), the following shall apply:


(a)
Where beam spacing is equal to or greater than 40 percent of the ceiling height (0.4 H), spot-type detectors shall be located on the ceiling in each beam pocket.


(b)
Where beam spacing is less than 40 percent of the ceiling height (0.4 H), the following shall be permitted for spot detectors:


i.
Smooth ceiling spacing in the direction parallel to the beams and at one-half smooth ceiling spacing in the direction perpendicular to the beams


ii.
Location of detectors either on the ceiling or on the bottom of the beams






(3)*
For beam pockets formed by intersecting beams, including waffle or pan-type ceilings, the following shall apply:


(a)
For beam depths less than 10 percent of the ceiling height (0.1 H), spacing shall be in accordance with 17.7.3.2.4.2(1).


(b)
For beam depths greater than or equal to 10 percent of the ceiling height (0.1 H), spacing shall be in accordance with 17.7.3.2.4.2(2).

 

[MMa7rous]

Thanks cdafd for this valuable replay
Moreoveer, where i can found a free download of NFPA 72 2010?

 

[cdafd]

Not free or download but you can look at any nfpa standard free once you fill out some info

And it is a little hard to scroll

http://www.nfpa.org/aboutthecodes/list_of_codes_and_standards.asp

http://www.nfpa.org/aboutthecodes/AboutTheCodes.asp?DocNum=72

 

[pipesnpumps]

Some of that is new to the 2010 version of 72.. be sure you use the right version of 72, or be sure you check with the AHJ and see if they will allow those portions of 2010 as providing equivalency to the applicable version (if it is an earlier version). These changes were based on recent testing.

Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.