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Adding alarm load of 3.0 amps for 15 minutes adds approximately:
0.75 Ah
Definition: 3.0 amps times 0.25 hours equals 0.75 amp hours.
Total from and before derating is:
6.75 Ah
Definition: 6.0 plus 0.75 equals 6.75 amp hours required minimum before safety margin.
If a designer applies 20 percent margin to 6.75 Ah, the selected battery should be at least:
8.1 Ah
Definition: 6.75 times 1.2 equals 8.1 amp hours.
Addressable loop isolators primarily protect against:
Short circuits
Definition: Isolators segment shorts so other sections remain operational.
A listed synchronized strobe system prevents:
Out of phase flashes in the same field of view
Definition: Sync aligns flashes to maintain clear visual cues.
A common cause of unexpected voltage loss is:
Loose or corroded connections
Definition: Poor terminations add resistance and heat, increasing voltage drop.
Speaker circuits for voice systems should be designed for:
Some headroom and intelligibility targets
Definition: Headroom plus intelligibility metrics ensure messages are understood.
Distributed power supplies must be:
Listed for fire alarm and supervised for faults
Definition: Listed, supervised supplies ensure faults are detected and reported.
Combination fire and carbon monoxide systems must provide:
Distinct patterns and indicators for each hazard
Definition: Temporal 3 versus Temporal 4 and distinct labeling help occupants take correct actions.
For sleeping rooms with combination detection, preferred audible for fire is:
Low frequency 520 hertz Temporal 3
Definition: Low frequency 520 hertz at T 3 improves awakening.
Supervisory signals indicate:
Off normal conditions needing attention, such as valve closed
Definition: Supervisory points prompt corrective action but are not alarms.
Trouble signals indicate:
A fault that could impair operation
Definition: Trouble includes opens, grounds, power faults, and device failures.
Line security or path supervision time for single path systems should be:
Short enough to detect failures in minutes
Definition: Enhanced single paths detect path failures rapidly; dual paths add diversity.
Central station service differs from remote station because it:
Includes installation, maintenance, testing, and monitoring as a listed service
Definition: Central station is a comprehensive, listed service model.
Proprietary supervising station means:
Owner’s facility monitors its own premises
Definition: Proprietary stations are owned by the protected entity.
Remote station service means signals go to:
A public fire service communications center
Definition: Remote stations transmit to public communications centers for dispatch.
Off premises transmission using cellular only should:
Meet supervision time limits and carrier reliability criteria
Definition: Cellular paths must meet supervision intervals and be part of a listed transmission method.
Mass notification non emergency messages should:
Yield to fire alarm and resume after
Definition: Fire alarm has priority over non emergency announcements.
Areas of high ambient noise over roughly 105 "dBA" should:
Use visible notification and planned voice/visual strategies
Definition: Extremely noisy spaces require visible cues and planned communications.
For high rise buildings, provide:
Fire command facilities and additional functions per building code
Definition: High rise provisions include command center, FD communications, and control interfaces.
carbon monoxide detection in dwelling units is typically required to:
Provide distinct carbon monoxide pattern and annunciation
Definition: Distinct carbon monoxide alarm cues prevent confusion with fire.
Emergency control functions like fan shutdown should be powered from:
Listed, supervised control circuits
Definition: Control power must be listed and supervised so failures report.
System impairments lasting more than a short duration should:
Trigger a documented impairment plan and fire watch
Definition: Impairment plans maintain safety until repair.
In sleeping rooms, the minimum at the pillow when low frequency appliances are not used is:
75 "dBA"
Definition: Provide about seventy five "dBA" at the pillow or use listed low frequency devices.
If visible appliances from different supplies are in the same field of view, they must:
Be synchronized with a listed method
Definition: Synchronization avoids disorientation and meets code intent.