Engineer.
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Provide one switch where shown. Activation of switch shall delay only
equipment shutdown and agent discharge. Switch shall be guarded,
spring-loaded type which operates only when pressure is manually applied to
the switch. Upon release of manual pressure, switch shall de-activate
allowing delayed functions to resume. After start of agent discharge,
switch shall have no effect. Activation of switch during normal
(non-alarm) conditions shall cause activation of system trouble signals.
]2.9
ALARM SIGNALLING DEVICES
Provide each protected area with audible and visual alarms located where
shown. All alarm circuits shall be electrically supervised. Provide
separate and distinct audible and visual pre-discharge and discharge
signals. Where the building is equipped with a separate fire evacuation
alarm system the discharge signals shall also be distinct from those used
by the building fire evacuation system. Each signal device shall be
provided with a rigid plastic or metal identification sign with lettering a
minimum of 40 mm 1.5 inches high. The pre-discharge alarm shall be
labelled "FIRE" and the discharge alarm shall be labelled "HALON
DISCHARGE." [Post-discharge visual alarms shall be located outside all
entrances to the protected areas, and shall be provided with signs reading
"HALON DISCHARGED WHEN FLASHING - DO NOT ENTER].
2.9.1
Audible Alarms
a.
Alarm bells
250 mm 10 inch [surface mounted] [recessed] with matching mounting back
box. Bells shall be of the vibrating type suitable for use in an
electrically supervised circuit. Bells shall be of the underdome type and
produce a sound output rating of at least 90 decibels at 3 meters 10 feet.
b.
Alarm horns
[Recessed,] [Surface mounted,] vibrating type suitable for use in an
electrically supervised circuit and shall have a sound output rating of at
least 90 decibels at 3 meters 10 feet.
2.9.2
Visual Alarms
[Flush] [Surface mounted] lamp assembly suitable for use in an electrically
supervised circuit. Lamp shall be the flashing [stroboscopic]
[incandescent] [rotary beacon] type and powered from the control panel
alarm circuit. Lamps shall provide a minimum of 50 candle power. Flash
rate shall be between 60 and 120 flashes per minute. Lamps shall be
protected by a thermo-plastic lens, red for pre-discharge alarms and blue
for discharge [and post-discharge] alarms. [Visual alarms may be part of
an audio-visual alarm assembly.]
2.10
MAIN ANNUNCIATOR
Annunciator shall be integral with the main control panel. Provide
separate alarm and trouble lamps for each zone alarm initiating circuit
located on the exterior of the cabinet door or visible through the cabinet
door. Supervision will not be required provided a fault in the annunciator
circuits results only in loss of annunciation and will not affect the
SECTION 13966N
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