Pub. 42004-139D
GAI-Tronics 700 Series Page/Party
®
Systems
Page: 3 of 10
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-139d.doc
11/99
Step 2 — Mounting of Station and Speaker Amplifier Enclosure
Each Page/Party
®
system station includes a plug-in amplifier, that mates with a fabricated steel, cast
aluminum, or molded reinforced non-metallic enclosure. Each enclosure provides a terminal strip for
connecting inter-station cable. Enclosures are packed separately from the plug-in amplifiers at the
factory, allowing the amplifiers to remain protected while the enclosures are installed and wired —
particularly important during system installation in areas under construction.
The 16-gauge steel enclosures do not provide any openings for conduits or cables because the location of
these will vary with each installation. Drill or punch the necessary openings before mounting the
enclosure. Locate the openings either along the top or bottom of the enclosure and near the rear surface.
Avoid the top center because of possible interference with the plug-in amplifier receptacle. A drill
template is supplied with each enclosure.
Cast aluminum enclosures are drilled and tapped on the top and bottom for specially-designed hub plates.
Unless special arrangements are made, the enclosures include plates for single 1¼-inch conduit. Plates
for single ½-inch or 1½-inch, or dual inch are available. The molded enclosures are supplied without any
conduit openings. Sealed threaded hubs, such as Myers “Scru-tite”, are recommended. A drill template is
supplied with each enclosure.
CAUTION
Use caution when drilling holes to avoid damaging internal electrical components and wiring.
Suggested mounting height for all station enclosures is 54 inches (137 cm). Subsets used with remote
subset amplifiers are supplied with 8-foot (244 cm) cables. Enclosures for remote subset amplifiers must
be mounted within reach of the 8-foot cable. Desktop or desk-edge stations enclosures are often mounted
in the knee-well of the desk.
Step 3 — Mounting of Line Balance Assembly
Each GAI-Tronics Page/Party
®
system requires one line balance assembly. Its function is to properly
load the page and party line circuits. When using GAI-Tronics standard cable, select a location that is:
•
near the electrical center of the system
•
adjacent to an indoor station in a relatively quiet area
•
no more than 5250 feet (1600m) from the most distant station
For larger systems or when using other types of cable, contact a GAI-Tronics representative for further
information. The line balance assembly has one electrical adjustment that must be made while using a
station (see below). The following is the preferred method for mounting the line balance assembly:
1.
Suspend the assembly from the lower side of the indoor wall station using a 1-inch conduit nipple
(not supplied).
2.
Connect one twisted pair wire for the page circuit and another for each of the party lines between the
terminal blocks of the line balance assembly and the associated indoor wall station.
3.
Make the wiring connections between the 305 Series Line Balance Assembly and the Model 702 and
703 Indoor Wall Station enclosures in accordance with the wiring diagrams at the end of this
publication.
