chrome. Microphone shall be connected with portable cord and microphone
plug inserted into flush mounted microphone jack.
a.
Provide desk mounted telephone type handset [in the Commanding
Officer's Office] [at the location indicated] for use with public
address system. Handset shall be constructed of high impact
plastic with heavy-duty coil cord. Handset shall contain a
press-to-talk switch, which, when pressed, shall automatically
connect handset to "all call" mode of system.
2.1.5.6
Station Selector Switch Panel
Station selector switch panels shall be incorporated into each public
address and monitoring subsystem and into the central public address
system. Selector switch panels shall be rack mounted type containing not
less than twenty-five switch positions. Switch positions not required may
be blanked, or if switches are provided, unused switches shall be clearly
identified.
a.
Subsystem selector switch panels shall contain [four] [_____]
station control switches with double pole, three position for
"MONITOR", "OFF", and "INTERCOM". One additional switch shall be
provided for "ALL CALL" of subsystems stations.
b.
Central system selector switch panel shall contain [_____] station
control switches with double pole, two position lever type switch
with "OFF" and "PUBLIC ADDRESS" positions. One additional switch
shall be provided for "ALL CALL" to all subsystems.
c.
Provide switches with self-wiping, precious metal contacts, and
means of switch identification.
2.1.5.7
Supervision Module
Provide supervision module for the central public address system with
audible and visual alarms to signify that a component of the supervised
systems is malfunctioning. Panel shall contain a silencing switch to
deenergize audible signal and pilot lamps to remain activated until system
fault has been corrected. Panel shall be [rack-mounted with central
amplification equipment] [mounted with preamplifier at central operation
location].
]2.2
CABLES AND RACEWAYS
Cable and raceways shall conform to UL 6 and UL 797. Cabinets and boxes
shall conform to UL 50. Cables for use in air plenums shall be UL
classified low smoke and low flame in accordance with NFPA 70.
2.2.1
Speaker Cable
Basic cables shall be single twisted pair shielded cables, 22 gage,
stranded tinned copper with vinyl insulation aluminum polyester shield,
stranded tinned copper wire with overall vinyl jacket. Multi-conductor
shielded pair cables conforming to basic speaker cable specifications are
acceptable.
2.2.2
Microphone Cable
Cable shall be single conductor shielded cable stranded copper No. [25]
SECTION 16822N
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