7. A metallic central control cabinet that shall comply with EIA-310-D.
The cabinet shall houses terminal strips, power supplies,amplifiers, system
volume control, and auxiliary equipment. It shall be lockable and
ventilated.
8. The master station shall accommodate [_____] stations and shall have a
speaker sensitivity of 40 dB minimum.
2.4.2
Remote Station
[Desk-top] [Surface wall] [Recessed wall] [Rack-mounted] remote stations
with [stainless steel] [anodized aluminum] face plates with tamperproof
mounting screws and [galvanized steel] [aluminum] backbox shall be
provided. The remote station shall have:
1. A speaker and with a minimum sensitivity of 40 dB for speakers less than
200 mm 8 inches in diameter and 45 dB for speakers 200 mm 8 inches or
greater.
2. A call announcement monitor lamp that lights when during incoming calls.
3. A recurring momentary tone that announces incoming calls.
4. Call Switch that permits a call to the master station.
5. Privacy Switch. When in the on position, the switch prevents the
transmission of sound from the remote station to system. When in the off
position, without further switch manipulation, response can be made to
incoming calls.
6. [A handset with hook switch, telephone type, arranged to disconnect the
speaker when the handset is lifted. The cord shall be 450 mm 18 inches
long and [permanently coiled] [metallic jacketed].]
2.4.3
Amplifier
2.4.3.1
Intercommunication Amplifier
Intercommunication amplifiers shall as a minimum conform to the following
specifications:
Output Power:
2 watts rms minimum with adequate power for all
functions and a 20% spare capacity
Total Harmonic
Distortion:
Less than 5 percent at rated output power with a
load equivalent to one station connected to
output terminals
Signal-to-Noise
Ratio:
60 dB or greater at rated output
Plus or minus 2 dB from 200 Hz to 10,000 Hz
Output Regulation:
Maintains output level within 2dB from full to
no load
Input Sensitivity:
Matched to input circuit and providing
full-rated output with sound-pressure level
SECTION 16721
Page 17
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