These are few notes from my previous study that I have kept since my initial Level I NICET Certification Exam. They are the most important requirements in Chapter 4, Fundamentals of Fire Alarm Systems – NFPA 72 National Fire Alarm Code. I have revised and updated a few of the codes for the 2007 edition. These requirements should be read over and over until memorized. This post will be a first in a series that I will post regularly.
- The Purpose of fire alarm system is to alert the occupants, to summon aid and to control fire safety functions.
- Equipment shall be listed for the purpose for which it is used.
- Fire alarm system plans and specifications shall be developed by persons who are experienced in design, installation and testing.
The designer shall be either Factory trained for the specific type and brand of fire alarm system or certified by nationally recognized organization like NICET acceptable to the AHJ or registered and licensed by state or local authority.
- Power supplies shall be installed per NFPA 70 National Electrical Code.
- Minimum of two power supplies shall be provide, one primary and one secondary.
- Primary power supply shall be a dedicated branch circuit (Commercial light and power, or an engine driven generator)
- The dedicated branch circuit shall be mechanically protected.
- Circuit disconnect means shall have a red marking and identified as “FIRE ALARM CIRCUIT”
- Location of the circuit disconnect means shall be identified at the fire alarm control panel.
- Secondary power supply shall operate the system for 24 hours in standby plus 5 minutes in alarm.
- Secondary Power supply in voice evacuation systems shall operate for 24 hours standby plus 15 minutes alarm.
- Secondary power supply for supervising station shall operate for minimum of 24 hours.
- Secondary power supply in protected premises shall automatically provide power within 10 seconds when primary power fails.
- Secondary power supply in supervising station shall automatically provide power within 60 second when primary power fails.
- Batteries shall be marked by month and year of manufacture.
- Batteries shall recharge within 48 hours of single discharge.
- Remote batteries and charging system location shall be identified at the control panel.
- Batteries shall be trickle charged or float charged.
Trickled charged batteries are offline and waiting to be put under load on power loss, fully charged batteries are fully charged and connected across the output of the rectifiers to smooth the output and to serve as a standby power on line power loss.
- Fire alarm, supervisory signals and trouble signals shall be distinctively and descriptively annunciated.
A supervisory signal sound shall be permitted to be used to indicate a trouble condition only if the distinction between signals shall be other means such as visible annunciation.
- Self -Restoring supervisory signal shall be automatically indicated within 90 seconds.
- Latching supervisory signal shall be indicated within 90 seconds.
- Trouble signals and their restoration to normal shall be indicated within 200 seconds.
- A means for silencing Alarm, Supervisory or Trouble notification appliance shall be key-operated, located within locked enclosure. or similar protection against unauthorized use.
- Audible trouble signal shall automatically re-sound every 24 hours or less until trouble restored to normal.
- Alarm signal Deactivation means shall deactivate both audible and visible notification appliances
- Subsequent actuation of initiating device shall cause the notification appliance to reactivate.
if permited by the AHJ subsequent activation of another addressable initiating device of the same type in the same room or space shall not reactivate the notification appliances.
- A means that is left in the silence position where there is no supervisory or trouble condition, will cause the trouble signal to sound.
- A means that is left in the off position where there is no alarm, will cause a trouble signal to sound.
I will have to break this post into two parts to ease the absorbing of the materials. There is also a section about power supplies that I think I should dedicate a separate post for. It is one of the hardest and most confusing sections of the code.
Look for part two and the continuation of this chapter.
Happy studying and cheers!