World Trade Center Fire Alarm System History

Discussion of all things related to fire alarms, including alarm systems, fire alarm collections, sirens, sprinklers, fire drills, evacuations, actual fires, building architecture, other kinds of safety drills like tornado and earthquake drills and such, etc.
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Wed Jun 19, 2013 8:08 pm

As I said in my first post, this topic exists to show the workings of fire alarm systems in large buildings, and is not trying to say that they were the most important part of 9/11 or something like that. As long as everybody remebers that, I think your videos will be fine.
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nightfly287
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Wed Jun 19, 2013 8:27 pm

Beat ya to it, Prog! :mrgreen:

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Wed Jun 19, 2013 8:44 pm

Well, this was footage from 9/11 in which the fire alarm was in the background which is why it could be touchy.
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Wed Jun 19, 2013 10:35 pm

Was this video to which you were referring?



The whoop tone that they have on the system is kind of creepy, especially in the environment that it was sounding in.
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Thu Jun 20, 2013 12:34 am

Well, yes, that was one of them.
And yes, that's very eerie.
I'll get around to posting the others soon; I'll have way more time once finals start on Friday.
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Thu Jun 20, 2013 12:39 am

What was that tone that I heard twice in the video (after the whoops)?
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Thu Jun 20, 2013 1:04 am

the dong dong
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Thu Jun 20, 2013 7:47 am

I don't remember where I saw this but I recall reading that WTC 7 had an older Firecom 8500 fire alarm panel, which would be the system that is heard in the video. I actually found the patent for this system a while ago and it explains the weird slow whoop/double chime tone.
Sound generation equipment, in accordance with the invention, incorporates both a whoop tone (pulsed siren form of sound) and a chime tone generator along with sequencing circuitry on a single IC (integrated circuit) card.
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Thu Jun 20, 2013 1:55 pm

I found Firecom's website, and indeed WTC7 has/had one of their systems.

http://www.firecominc.com/home.html
With rapid growth and a unique corporate structure, Firecom has become a recognized leader in complex life safety, high rise, fire alarm, and voice communication systems. Our products are installed in such prestigious properties as the United Nations. The Waldorf-Astoria Hotel, 7 World Trade Center, and Columbia Presbyterian Hospital. With the introduction of Life Safety Net 2000, we now offer this expertise nationwide.
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Thu Jun 20, 2013 5:15 pm

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Thu Jun 20, 2013 5:25 pm

WARNING: Read the post before watching the video!


Here's one. This video is remarkably eerie. There is a 60hz or 120hz buzz in the background which I thought may have been an electromechanical horn, especially given how loud it was by the door. However, I think that the substation was also in WTC 7, so it could have also been that.
Warning: Starting at 0:23 it is revealed that there are people in the building, which may not have made it. In addition, at 1:41 possible screaming can be heard in the background, and at 2:39 a possible suicide may be heard. Either of these could be cutting equipment among other things, but viewer discretion is advised.
I'm fairly certain that this is the most graphic/disturbing video, and if the staff wishes, they can remove it, of course. If you do so, please PM me so that I can upload an edited version.
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Thu Jun 20, 2013 5:55 pm

That is definitely a very sad video. :( However, I think that the tone heard by the door is most likely some sort of door alarm, since WTC 7 did have a voice evac system.
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Fri Jun 21, 2013 11:31 am

Definitely very gut-wrenching to watch those videos. I pray that all of the victims and the victims family have found peace.
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Fri Jun 21, 2013 10:32 pm

Here is a video that shows the emergency command center in the lobby of the North Tower during the collapse of the South Tower. As you can see, many of the lights on the panels were illuminated once the collapse began.

Please note, this video contains graphic and/or disturbing content, including the description and sounds (no visuals) of people on fire and of people commuting suicide. Viewer discretion is advised.


(The panel can be viewed at around 3:30)

Here is another, better quality version, which is less potentially graphic and disturbing than the previous video:

(The panel can be viewed at around 1:40)
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Sat Jun 22, 2013 2:44 am

Both of those videos are sad videos :cry:
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