facing upward.
2.8
INHIBIT SWITCH
Provide one switch where indicated. Activation of switch shall delay only
time delay countdown, equipment shutdown, and agent discharge. Switch
shall be guarder, spring-loaded type which operates only when pressure is
manually applied to the switch. Upon release of manual pressure, switch
shall deactivate 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 as
shown. 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 "CARBON DIOXIDE DISCHARGE."
[Post-discharge visual alarms shall be located outside entrances to
protected areas, and provided with warning signs reading "CARBON DIOXIDE
DISCHARGED WHEN FLASHING - DO NOT ENTER."]
2.9.1
Alarm Bells
[Surface mounted] [Recessed], [_____] [250 mm] [10 inch] diameter 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. Bells shall be finished in red enamel.
2.9.2
Alarm Horns
[Surface mounted] [Recessed], vibrating type suitable for use in an
electrically supervised circuit and with a sound output rating of at least
90 decibels at 3 meters 10 feet. Horns shall be finished in red enamel.
2.9.3
Visual Alarms
[Surface] [Flush] 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 thermoplastic 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
SECTION 13961N
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