School Expansion: Voice vs. Horn FA Upgrade?

3/25/2019

A middle school is being expanded by two classrooms and about six small offices and supports spaces. The addition is separated by a fire barrier from the main school, and the existing school has a temporal-3 horn/strobe fire alarm system throughout (and is fully-sprinklered).

Current code requires an emergency voice/alarm communication system for the expansion, which the design team intends to provide.

The question is how to address the interaction between the new voice system and the existing? Is this purely and AHJ call?

Ideally, the school should consider upgrading their entire fire alarm system to voice for a cohesive message and best benefit. However, funding is very tight and we're not confident they'll have the support they need to do a full upgrade at this time.

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2 Comments

PETE

3/25/2019 10:22:32 am

How old is the existing? If it is old enough, you may be able to make the point that you cannot accomplish strobe synchronization using new and old devices. This is mandated in 72, and it's an ADA requirement.

Raul Vasquez

3/25/2019 10:54:17 am

Unless you see two or more in line of sight, sync would not be the greatest issue nor integration. the issue is conflicting evacuation tones and or vocal messages. the old horns may be mechanical steady, march time, California, there could be electro mech, temporal 3 and the voice system could be programmed to play the same through the speakers utilizing a digital sound clip to match, but you cant offer voice evac to one side and not the other

its a federal, state, county and AHJ decision.

with alarms its not necessary to perform a full upgrade unless its mandated for this addition, so the option of expanding to the new areas utilizing a synced A/V power supply triggered by the old system is one valid route. The main point is to have the same notification for evacuation and then look into sync. There are audio clips to match what's existing out there if your panel manufacturer has the means of utilizing them in programming, but for one section to have voice and not the other is not standard. you can prep that portion of the building for the future with speaker strobes and not play a voice evacuation and do play the same evacuation tones used in the other side of the school.

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