[Style D], to signal line circuits (SLC), Style [5] [6], in accordance with
NFPA 72. Alarm notification appliances shall be connected to notification
appliance circuits (NAC), Style Z in accordance with NFPA 72. A looped
conduit system shall be provided so that if the conduit and all conductors
within are severed at any point, all IDC, NAC and SLC will remain
functional. The conduit loop requirement is not applicable to the signal
transmission link from the local panels (at the protected premises) to the
Supervising Station (fire station, fire alarm central communication
center). Textual, audible, and visual appliances and systems shall comply
with NFPA 72. Fire alarm system components requiring power, except for the
control panel power supply, shall operate on 24 Volts dc. Addressable
system shall be microcomputer (microprocessor or microcontroller) based
with a minimum word size of eight bits and shall provide the following
features:
a. Sufficient memory to perform as specified and as shown for
addressable system.
b. Individual identity of each addressable device for the following
conditions: alarm; trouble; open; short; and appliances missing/failed
remote detector - sensitivity adjustment from the panel for smoke
c. Capability of each addressable device being individually disabled
or enabled from the panel.
d. Each SLC shall be sized to provide 40 percent addressable expansion
without hardware modifications to the panel.
1.4.2
Operational Features
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NOTE: For zoned fire alarm and detection systems,
the systems should be zoned by type of device and by
floor.
The designer will list zones and indicate the exact
wording of the descriptive zone labeling.
Remove item j. below when elevators are not involved.
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The system shall have the following operating features:
a. Monitor electrical supervision of [IDC,] [SLC,] and [NAC]. [Smoke
detectors [shall] [shall not] have combined alarm initiating and power
circuits.]
b. Monitor electrical supervision of the primary power (ac) supply,
battery voltage, placement of alarm zone module (card, PC board) within
the control panel, and transmitter tripping circuit integrity.
c. A trouble buzzer and trouble LED/LCD (light emitting diode/liquid
crystal diode) to activate upon a single break, open, or ground fault
condition which prevents the required normal operation of the system.
The trouble signal shall also operate upon loss of primary power (ac)
supply, low battery voltage, removal of alarm zone module (card, PC
board), and disconnection of the circuit used for transmitting alarm
signals off-premises. A trouble alarm silence switch shall be provided
SECTION 13851A
Page 12
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