sign which is at least 25 mm one inch high. System control panel shall be
UL listed or FM approved for use in fire protection extinguishing system
control (releasing device service). Provide a supervised isolation switch
to permit testing or servicing of electrical control system without
discharging carbon dioxide system.
2.7.6.1
Trouble Signals
A single open or ground fault condition in detection (initiating) circuit
shall not result in loss of system function, but shall cause actuation of
system trouble signals. A ground fault condition or single break in an
other circuit shall result in activation of system trouble signals.
[Supervision of wiring external to the control panel for mechanical
equipment shutdown is not required, provided a break in such wiring will
cause associated mechanical equipment to shut down.] Loss of ac power, a
break in standby battery power circuits, or abnormal ac power or low
battery voltage shall result in operation of system trouble signals. The
abnormal position of a system switch in the control panel shall result in
operation of system trouble signals. Trouble signals shall operate
continuously until system has been restored to normal at the control panel.
2.7.6.2
Panel Switches
Provide panel with the following switches:
a.
Trouble silencing switch which transfers trouble signals to an
indicating lamp. Upon correction of trouble condition, audible
signals shall again sound until switch is returned to normal
position, or trouble circuit shall be automatically restored to
normal upon correction of trouble condition. Silencing switch of
a momentary action, self-resetting type is acceptable.
b.
Evacuation alarm silence switch which when activated shall silence
associated alarm devices and cause operation of system trouble
signals.
c.
Individual zone disconnect switches which when operated shall
disable only their respective initiating circuit and cause
operation of the system and zone trouble signals.
d.
Reset switch which when activated shall restore system to normal
standby status after correcting cause of alarm.
e.
Lamp test switch.
f.
Isolation switch to permit testing or servicing of electrical
control system without discharging carbon dioxide.
2.7.7
Secondary Power Supply
Provide nickel cadmium, lead calcium, or sealed lead acid batteries and
charger. Do not use dry cell batteries. Provide steel cabinet with
cylinder lock for batteries.
2.7.7.1
Storage Batteries
Provide batteries of proper ampere-hour rating to operate system under
supervisory conditions for [60] [24] hours, discharging carbon dioxide at
the end of that period, and then operating system under alarm conditions
SECTION 13962N
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