protector shall be rated for a maximum let thru voltage of 350 Volts ac
(line to neutral) adn 350 Volts ac (neutral to ground). Surge protection
device shall be UL listed and labeled as having been tested in accordance
with UL 1449.
2.2.6
Signal Surge Protection
All amplifiers shall have internal protection circuits which protects the
component from mismatched loads, direct current and shorted output lines.
Communication cables/conductors shall have surge protection installed at
each point where it exits or enters a building.
2.3
TYPE 2 SYSTEM
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NOTE: Delate this section unless specifyng a Type 2
System.
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A microprocessor switched single conversation path, central control
intercommunication system shall include [an annunciator panel,] a master
station, automatic switching equipment, remote stations and all amplifiers,
control equipment and ancillary devices required to provide features
specified. The master station shall selectively communicate with any
remote station by actuating the [two] [three] digit number assigned to that
remote station. [The master station shall be designed to communicate with
all remote stations simultaneously or in groups of not less than 10
stations by actuating an assigned "all-call" number.] Only the selected
remote station shall listen or talk to the master station. A nonselected
remote station shall not be able to hear or interfere with any portion of
conversation between a master station and the selected remote station.
Hanging up the master station handset shall reset the system for next call.
The quantity and location of remote stations shall be as indicated on the
drawings. [A paging function shall also be part of the system.]
2.3.1
Master Station
[Desk-top][Surface wall] [Recessed wall] [Rack-mounted] type master station
equipped with:
1. A 12 digit keypad selector to transmitt calls to other stations and
initiate commands for programming operatins.
2. Volume control to regulate incoming call volume.
3. Light annunciation to identify calling stations and stations in use.
The light shall remain on until a call is answered.
4. Tone annunciation with a momentary audible tone signal that announces
incoming calls.
5. Reset controls that cancels calls and resets system for the next call.
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.]
7. A metallic central control cabinet that shall comply with EIA-310-D.
The cabinet shall houses terminal strips, power supplies,amplifiers, system
SECTION 16721
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