distinguishable from acknowledgements and routine messages, by use of a
different color, typeface, type size, or similar means.
2.6.5
Audible Annunciation
Provide each network with audible device(s) mounted in the console to
indicate the receipt of emergency, supervisory, and trouble signals.
Devices shall produce a distinct sound to annunciate emergency signals. The
same sound may be used to annunciate receipt of both supervisory and
trouble signals, as defined by NFPA 72, however supervisory signals shall
have priority over trouble signals and shall be clearly distinguishable on
the visual display and printout.
2.6.6
Receivers
Provide each network with solid state radio receiver of standard design.
Provide both receiver and transmitter for polling (interrogation)-type
systems. Provide an audio amplifier with loudspeaker connected to the
demodulated output of the receiver. Signal receivers shall be completely
solid state, narrow band.
2.6.7
Decoders
Provide signal decoders which are fully solid state, utilizing rack-type
construction and plug-in type printed circuit cards, for decoding of
incoming messages or signals.
2.6.8
Primary Power Source
**************************************************************************
NOTE: Design power supply circuits to comply with
NFPA 1221 Chapter 2 paragraph entitled "Power".
**************************************************************************
Provide primary power for each network [through a connection into the line
side of the building's regular AC service circuit] [from the building
emergency service circuit as shown] through a lockable fused disconnect
switch. Provide a separate disconnect switch for each network.
2.6.9
Emergency Power Source
**************************************************************************
NOTE: Select 24 hours or more unless an emergency
generator complying with NFPA 1221 Chapter 2 ,
capable of continuous operation for at least 24
hours is provided.
**************************************************************************
Provide emergency backup battery power supply. Provide batteries of
sufficient capacity to operate all functions of the network for [8] [24]
[60] hours. Mount batteries on racks designed for that purpose. Provide a
termination block for each battery rack. Locate batteries [in the
communication center] [where shown]. Do not locate vented wet-cell
batteries in normally-occupied rooms. For batteries located remote from the
control equipment, provide fuses on positive and negative leads at the
battery rack.
SECTION 13853N
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