A building which has an old fire alarm system is going to have its interior completely gutted (all systems, walls, everything but the structure and exterior walls are to be removed). The fire alarm system is to be demolished and replaced entirely, and the building will change to a business occupancy once complete.

Is a fire alarm system required by code to be active during the renovation?

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The activation time (in seconds) of a standard response (RTI of 85 m^1/2s^1/2), Ordinary Temperature (65 deg C) heat detector within a room that has an initial temperature of 22 deg C and exposed to a ceiling plume at 78 deg C traveling at 2.3 m/s is most nearly?
     a. 10 s
     b. 36 s
     c. 54 s
     d. 82 s

Solution | Posted 10/24/18

Determine the response time index (in ft^1/2 s^1/2) for a 160-degree F heat detector with a listed spacing of 30 feet.
a. 44
b. 80
c. 169
d. 180

Solution | Posted 08/15/18

Which of the following is not a preferred interface between fire alarm and smoke control systems due to the requirement for equipment to be listed as compatible?
a. Equipment connected to Building Automation/Management System, which is connected to Fire Alarm by network connection
b. Equipment connected to Building Automation/Management System, which is connected to Fire Alarm by electrical contact/relays
c. Digital Control Equipment connected directly to Fire Alarm System via network connection
d. Mechanical Equipment connected directly to Fire Alarm System via contacts/relays

Solution | Posted 08/06/18

A liquid storage tank rupture results in a fire containing an open 45 gallon (130 kg) tank containing animal fat. Using gross heat of combustion, estimate the time it would take to burn the remaining fuel without interruption if the tank is half filled and the 􀃍re is approximately 2.45 MW.
a. 1.2 seconds
b. 11 minutes
c. 18 minutes
d. 17.6 hours

Solution | Posted 08/03/18

Daily Discussion question submitted from a member:

I wanted to see if you have heard of any great programs, apps, databases, etc. that are appropriate for creating and maintaining panel schedules.  We currently use Microsoft Access to collect data and turn it into easy to understand panel schedules for the other fire protection engineers and the maintenance team.  Our panel schedules contain info such as how to impair a building (which switch’s to enable/disable), building contact info, a list of all devices and modules, info on all NACs and Power Supplies, sprinkler components and their corresponding alarm device.  Microsoft Access is becoming increasingly difficult to maintain and it appears that this program has been put on the back burner for Microsoft. 

Have you heard about programs that other sites/companies are using?  With iPad integration? With the ability to limit who can actually edit the data?  Thanks for the help.

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Daily Discussion question submitted from a member:

It seems that I must have missed something in the 23 years I've been in Code Enforcement.  Since when has it been required for a smoke detector to be in the pit of the elevator?  This is absolutely insane.  We've had more nuisance alarms recently in new buildings.  One is a 4 story nursing home, that the alarm has gone off 4 times.  The alarm company changed the detector and it been good now.  However there is still dirt, moisture, humidity, etc.  All the things that smoke detectors don’t like.

I've looked and Googled it and have only come up with a heat detector within 24" of the sprinkler head, which I understand.  I know smoke rises so why isn't the top of the shaft sufficient?  I feel we are going backwards.

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Which of the following installations can be acceptable for smoke detectors?
a. Wall-mounted smoke detector located 3 inches down from the ceiling
b. Smoke detector located at the bottom of a shallow beam
c. Ceiling-mounted smoke detector located 2-1/2 inches from a wall
d. Smoke detector located adjacent (1 ft) to a supply diffuser

Solution | Posted 06/25/18

A fire alarm system containing horn/strobes, manual pull stations, fire sprinkler monitoring, and heat
detectors would be considered what type of fire alarm system?
a. manual, temporal-3
b. manual and automatic, temporal-3
c. manual, emergency voice/alarm communication
d. manual and automatic, emergency voice/alarm communication

Solution | Posted 06/12/18

Solution | Posted 06/11/18

A project has restroom stall walls that run floor to ceiling. There are gaps above and below the door for venting. Are strobes required in each stall? Audibility would be provided with a combination horn/strobe in the main restrooms space.

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NFPA 72 (2016) Edition 10.4.1 states that all systems "are to be installed in accordance with plans approved by the AHJ." When designing your fire alarm system, what do you frequently coordinate with the AHJ? If you're an AHJ, what questions are you commonly asked from fire alarm designers?

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