Project Name M-DCPS MASTER Nov. 2014
Project No. SPECIFICATION GUIDELINES 13745 − 8
a. Design the power amplifiers, if used, for completely dependable continuous
operation in alarm, paging, and sound reinforcement use.
b. They shall meet the UL 1480 standard requirements for amplifiers intended for
use in fire-protective signaling systems.
c. The amplifiers shall deliver an output as designed for the system at elementary,
middle, and high schools at less than 2 percent harmonic distortion at full rated
output.
d. Manual or Automatic reset DC circuit breakers shall be provided as needed to
safeguard against damage from prolonged overloads and from extreme
overloads, such as a shorted output line.
e. Input power protection shall be provided by an easily replaceable slow-blow fuse.
Controls shall be provided for level control and lo-cut filter to protect horn-type
speakers.
f. A LED protection indicator shall be provided.
g. The amplifier shall operate continuously from 120 VAC. The 120 VAC shall be
supplied from a panel fed from the emergency generator if there is a power
failure.
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NOTE TO SPECIFIER: Not all of the manufacturer's systems listed include switch panels, since
intercoms can be installed with or without switch panels. Edit the following paragraph to suit
project conditions.
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6. For the program distribution system, provide the following functions:
a. Transmit one program from one source to one or a group of loudspeakers.
b. Select from five (5) program sources for one program channel.
c. Distribute a program to all speakers by means of an all-call switch.
d. Provide a Switchcraft B3F microphone jack on the front of the equipment rack
wired to microphone 1 input.
e. Aurally and visually monitor a program before and during distribution to speakers.
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NOTE TO SPECIFIER: The following Tone Generator and Master Clock System are integral to
the intercom system. See Section 13805 for an optional wireless clock system not requiring a
separate clock conduit. Consult with MDCPS Staff from Facilities Design and Standards to
determine if the use of a wireless clock system is acceptable for the Project.
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G. Tone Generator:
1. The installation shall include a tone generator or WAV file system for distributing class
change and emergency signaling tones to loudspeakers.
2. The tone generator or WAV files shall be capable of producing at least 7 different and
distinct tone signals. The tones shall be activated in the following 3 ways:
a. Tones shall be activated by dialing access codes from authorized administrative
phones via the communications system central control.
b. Tones shall be activated via signals from the master program clock.
H. Master Clock System:
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