2.3
OVERVOLTAGE AND SURGE PROTECTION
2.3.1
Power Line Surge Protection
Protect equipment connected to AC circuits from power line surges.
Equipment shall meet the requirements of IEEE C62.41.
2.3.2
Communications Link Surge Protection
Protect communications equipment against surges induced on communications
links. Install surge protection circuits at each end of cables and
conductors, except fiber optics, which serve as communications links, to
meet the following two waveforms:
a.
A 10 microsecond by 1000 microsecond waveform with a peak voltage
of 1500 volts and a peak current of 60 amperes.
b.
An 8 microsecond by 20 microsecond waveform with a peak voltage
of 1000 volts and a peak current of 500 amperes. Provide
protection at the equipment. Install additional triple electrode
gas surge protectors, rated for the applications, on each wireline
circuit within 3 feet of the building entrance. Do not use fuses
for surge protection.
2.3.3
Sensor Wiring Surge Protection
Protect digital and analog inputs and outputs against surges induced by
sensor wiring installed outdoors and as shown. Test inputs and outputs
with the following waveforms:
a.
A 10 microsecond by 1000 microsecond waveform with a peak voltage
of 1500 volts and a peak current of 60 amperes.
b.
An 8 microsecond by 20 microsecond waveform with a peak voltage
of 1000 volts and a peak current of 500 amperes. Do not use fuses
or surge protection.
2.4
DIGITAL ALARM COMMUNICATOR RECEIVER (DACR)
Provide two identical DACRs or control consoles. Install both consoles at
the main fire alarm watch office as indicated. Each system console shall
be completely assembled, wired, and tested at the factory, and delivered
ready for installation and operation. Each base station console (system)
shall perform the receipt, processing, and display of emergency and
non-emergency messages transmitted by the DACTs specified herein,
independently of the other console. Each console shall contain a complete
independent receiving system, decoder, audio devices, visual display,
clock, printer, primary and emergency power supplies, power supply
monitors, memory devices, and interconnecting cable. If the automatic DACT
tests specified under paragraph titled "Automatic DACT Test" are initiated
by a polling (interrogation) device located at the base station, then each
of the two required consoles shall have its polling device. One such
device shall always be active, with the other in standby status. Failure
of the active device shall automatically cause the second device to take
over the polling (interrogation) function. Each DACR shall be capable of
receiving signals from a minimum of four separate telephone circuits.
SECTION 13854N
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