[flush ceiling] [pendant] [wall] mounting with a relief of back pressure.
[Baffle for flush speakers shall be a minimum thickness of 0.8128 mm 0.032
inches aluminum [brushed to a satin sheen and lacquared] [with textured
white finish] [_____]]. [Vandal-proof high strength baffles for flush
mounted speakers shall be self-aging cast aluminum with tensile strength of
3,093 kg/sq. cm 44,000 psi and a minimum thickness of 0.635 mm 0.025 inch.
The mounting screws shall be heat-treated alloy and textured white epoxy
finish.] The cone-type loadspeakers shall comply with the following
specifications:
Minimum Axial Sensitivity:
A pressure rating of 45 dB.
Within plus or minus 3 dB from 70 to
15,000 Hz
Minimum Dispersion Angle:
100 degrees
Line Transformers
Power Rating:
At least 4 watts with at least four taps
with insertion
rate of 0.5 dB.
Speaker Size:
200 mm 8 inches with 25 mm 1 inch voice
coil
and minimum 142 grams 5 oz ceramic magnet
2.5
SPEAKER ENCLOSURES
Speaker enclosures shall be compatible with the speakers specified and
comply with UL 50.
2.6
TERMINALS
Terminals shall be [solderless, tool-crimped pressure] [or] [_____] type.
2.7
COMMUNICATIONS WIRING
Type of signal and control circuit wire and number of conductors shall be
provided as recommended by the intercommunication system manufacturer, and
as necessary to provide a complete and operable system. Where required,
cable shall be UL classified low smoke and low flame for use in air plenums
in accordance with NFPA 70.
2.8
SURGE PROTECTION
Major components of the system such as Master Stations, Amplifiers, and
Remote Stations, shall have a device, either internal or external, which
shall provide protection against voltage spikes and current surges.
PART 3
EXECUTION
3.1
INSTALLATION
All system components and appurtenances shall be installed in accordance
with the manufacturer's instructions and as specified and shown. Units to
be mounted outside or subject to inclement conditions shall be weatherproof
or be mounted in weatherproof enclosures.
SECTION 16721
Page 20
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