PE Problem #32

7/18/2019

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 07/19/19

3 Comments

Ryan

7/18/2019 06:50:25 am

C) NFPA HB Pg. 14-49

Ben

7/21/2019 02:30:35 am

While I agree with the answer, but I think there are a lot of potential traps when using control systems supplied by others to control smoke management system.

A building control system could use a general purpose IP network connected to the internet. This arrangement would seem to be "not fit for purpose" as all kinds of network traffic would be using the same network and the network could get overwhelmed from time to time.

Interfacing with a BMS system using relays could be problematic also as the people who design and construct BMS systems may not be familiar with the survivability of signal pathways requirements for emergency equipment prescribed by NFPA 70.

9/2/2019 07:45:44 am

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PE Problem #32

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