2.5.3
Digital Alarm Communicator Transmitter Interface Device
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NOTE: If a DACT interface device is not required,
delete this paragraph.
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The DACT interface device shall provide a means of converting the signals
available from the local control equipment into a form that is compatible
with the DACT inputs, while still maintaining electrical supervision of the
entire system. Interface devices shall be utilized when direct connection
between local fire alarm control equipment and the DACT is not possible.
2.6
DIGITAL ALARM COMMUNICATOR TRANSMITTER POWER SUPPLY
Digital alarm communicator transmitters shall be powered by a combination
of locally available 120 Vac, and sealed lead-calcium type batteries
requiring no additional water. In the event of loss of 120 Vac power, the
transmitter shall automatically switch to battery operation. The
switchover shall be accomplished with no interruption of protective
service, without adversely affecting the battery-powered capabilities, and
shall cause the transmission of a trouble message in no less than [30]
[_____] seconds. Upon restoration of ac power, transfer back to normal ac
power supply shall be automatic and the battery shall be recharged. The
battery charger shall be capable of restoring the batteries from full
discharge to full charge within 12 hours. The converter/battery charger
shall be installed within the transmitter enclosure. Power supply
transient voltage surge suppression shall be provided.
2.6.1
Battery Power
The battery package shall be capable of supplying all the power
requirements for a given DACT and DACT interface device.
2.6.2
Battery Duration
Digital alarm communicator transmitter standby battery capacity shall
provide sufficient power to operate the transmitter in a normal standby
status for a minimum of 48 hours and shall be capable of transmitting
alarms during that period.
2.6.3
Battery Supervision
Each DACT shall constantly monitor and supervise its own battery-powered
supply. A low-battery condition shall be reported when battery voltage
falls below 75 percent of the rated voltage.
2.7
PERIPHERAL EQUIPMENT
2.7.1
Conduit
Conduit and fittings shall comply with UL 6, UL 1242, and UL 797.
2.7.2
Ground Rods
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NOTE: Determine the size, type and number of ground
rods to be used based on local conditions, earth
resistivity data, and on the size and type of the
SECTION 13853A
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