Smoke detectors vs Smoke alarms

[shortcircuit1]

While you are waiting for Gadfly, I did find this:



https://www.sdmmag.com/articles/85224-horns-strobes-clarifying-code-requirements

Not exactly what you asked, no code section.

Seems like a reputable source.

Thanks for the article reference!

 

[gadfly56]

I was referring to system fire alarm strobes not the local smoke alrms like if someone in the building pulls a pull station then the occupants in the building should be notified through strobes in their dwelling units.We need a 75db in the sleeping area as per NFPA 72 but do we require one outside the sleeping area per NFPA?

Ahhh, well I guess I misunderstood. However, if you go back to post #12, the section cited (29.5) refers to both smoke detectors and notification appliances meeting the same requirements as smoke alarms in 29.5.1. So, if you have a smoke alarm with an integral sounder outside the sleeping area, I would propose you'll need at least a horn in the same location to make some noise if you're using a regular fire alarm system.

 

[shortcircuit1]

Ahhh, well I guess I misunderstood. However, if you go back to post #12, the section cited (29.5) refers to both smoke detectors and notification appliances meeting the same requirements as smoke alarms in 29.5.1. So, if you have a smoke alarm with an integral sounder outside the sleeping area, I would propose you'll need at least a horn in the same location to make some noise if you're using a regular fire alarm system.

You are right!I should read it more carefully!:thumbsup:

 

[LIM]

2013 NFPA 72

29.3.6 All audible fire alarm signals installed shall meet the
performance requirements of 18.4.3, 18.4.5.1, 18.4.5.2, and
29.3.8.


18.4.5 Sleeping Area Requirements.
18.4.5.1* Where audible appliances are installed to provide
signals for sleeping areas, they shall have a sound level of at
least 15 dB above the average ambient sound level or 5 dB
above the maximum sound level having a duration of at least
60 seconds or a sound level of at least 75 dBA, whichever is
greater, measured at the pillow level in the area required to be
served by the system using the A-weighted scale (dBA).
18.4.5.2 If any barrier, such as a door, curtain, or retractable
partition, is located between the notification appliance and
the pillow, the sound pressure level shall be measured with the
barrier placed between the appliance and the pillow.
18.4.5.3* Effective January 1, 2014, audible appliances provided
for the sleeping areas to awaken occupants shall produce a low
frequency alarm signal that complies with the following:
(1) The alarm signal shall be a square wave or provide equivalent
awakening ability.
(2) The wave shall have a fundamental frequency of 520 Hz
± 10 percent.

 

[gadfly56]

2013 NFPA 72

29.3.6 All audible fire alarm signals installed shall meet the
performance requirements of 18.4.3, 18.4.5.1, 18.4.5.2, and
29.3.8.


18.4.5 Sleeping Area Requirements.
18.4.5.1* Where audible appliances are installed to provide
signals for sleeping areas, they shall have a sound level of at
least 15 dB above the average ambient sound level or 5 dB
above the maximum sound level having a duration of at least
60 seconds or a sound level of at least 75 dBA, whichever is
greater, measured at the pillow level in the area required to be
served by the system using the A-weighted scale (dBA).
18.4.5.2 If any barrier, such as a door, curtain, or retractable
partition, is located between the notification appliance and
the pillow, the sound pressure level shall be measured with the
barrier placed between the appliance and the pillow.
18.4.5.3* Effective January 1, 2014, audible appliances provided
for the sleeping areas to awaken occupants shall produce a low
frequency alarm signal that complies with the following:
(1) The alarm signal shall be a square wave or provide equivalent
awakening ability.
(2) The wave shall have a fundamental frequency of 520 Hz
± 10 percent.

Very important! I keep forgetting about that. :slaphead:

 

[shortcircuit1]

Very important! I keep forgetting about that. :slaphead:

Good one:happyyes:

 

[webcrest]

smoke alarms are more sensitive.

smoke alarms are more sensitive.

i think smoke alarms are more sensitive. like if you burn food in the kitchen, or have too many people smoking in the house, it will set it off.