shown] through a lockable fused disconnect switch.
Provide a separate
disconnect switch for each console.
2.1.7
Emergency Power
Supply emergency power by [lead acid] [_____] type batteries having plastic
cases and explosion-proof vents. Provide batteries of sufficient capacity
to operate functions of the console for no less than 24 continuous hours,
in the event of loss of ac power. Following 24 continuous hours of
operation by batteries, batteries shall have ample capacity to operate all
components of the system, including alarm signaling devices in the total
alarm mode for a period of 10 minutes. Size batteries to deliver 50
percent more ampere/hour than required for the calculated capacities. Mount
batteries on racks designed for mounting batteries. Provide a termination
cabinet as part of the required rack. Locate battery racks where shown.
2.1.7.1
Emergency Power Switchover
In the event of loss of normal ac power, provide automatic transfer to the
emergency power mode, without interruption or loss of console memory. When
ac power is restored, provide automatic transfer back to normal mode.
2.1.7.2
Console Battery Charger
Each self-regulating charger shall have the capacity to completely recharge
its associated batteries from full discharge within 24 hours with the
console fully operational on primary ac power. The console shall remain
operational on ac power with the batteries removed.
2.1.8
Console Supervision
The supervisory controls shall provide constant supervision of the
operating condition of the console. Provide individual indicators for each
major component, and produce an audible signal in the event of failure of a
major component. Provide an audible signal distinctly different from the
signal used to annunciate alarms. Provide a switch to silence the audible
trouble signal. Provide separate alarm trouble lamps for each zone alarm
initiating circuit, located on exterior of cabinet door or visible through
the door. Provide a suitable means for testing the control panel meter or
lamp visual indicating devices.
2.1.9
Tie-Line Repeater
**************************************************************************
NOTE: Tie-line repeaters are required only where
signals are to be repeated or retransmitted to other
fire stations. Where Type A central system is
provided, a one-way repeater is required. Type B
systems require a two-way repeater.
**************************************************************************
Provide a [one-way] [two-way] tie-line repeater with the control unit.
2.1.10
Variable Code Transmitter
**************************************************************************
NOTE: This device is required in only Type A
systems where a telegraphic (coded) circuit is one
of the two dispatch circuits required by NFPA 1221,
SECTION 13851N
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