GAI-Tronics 780-001 Explosion-proof Handset Stations - Manual (Page 2)

Pub. 42004-156D
Model 780/785-001 and 7805/7855-001 Explosion-proof Handset Stations Page: 2 of 12
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03/04
Installation
Whether installing an entire system or only an add-on station, consult the system layout diagrams at the end
of this manual. These figures, used in conjunction with the station installation information and the cable
layout guide, should provide all the information necessary to install the Page/Party
®
stations. These figures
do not show an explosion-proof station; however, the basic points of the system layout and design still
apply.
NOTE
A separate power feed is recommended for Page/Party
®
stations in Div.1 areas. With a
separate power feed, the Page/Party ® stations can be shut off for maintenance without disrupting the power
supply to the other equipment in the Div. 1 area.
Enclosure Placement
All GAI-Tronics Page/Party ® units are wired in parallel. Good system layout design minimizes the cable
required for each installation. GAI-Tronics multi-conductor cable, designed especially for this application,
is recommended. The number, size, and color-coding of conductors are listed in the accompanying system
connection diagrams.
System layout and power cable length are important considerations when installing Page/Party ® equipment.
The rules vary for different systems, but generally, the total power cable length should not exceed one mile
(5280 feet) for 115 V ac systems. The length of cable between the stations is not a factor; the total cable
length is the most important consideration.
Mounting
To maintain the explosion-proof integrity of these stations, all mounting hardware is located outside the
aluminum enclosure. The suggested mounting height for all station enclosures is 54 inches (137 mm) up to
the centerline of the enclosure.
Indoor Station: Mount the indoor unit using the two mounting straps on the rear of the enclosure. Refer to
Figure 1. Use the standard
3 /
8
-inch bolts to secure the enclosure to the mounting surface. Secure the two
bottom bolts first, then the top bolts. The mounting strap design allows the station to be removed from its
mounting surface by removing only two of the bolts.
Outdoor Station: The outdoor model stations are shipped with a separate glass-reinforced polyester
enclosure with a front door. This enclosure has four 0.44-inch diameter mounting feet in the 4 corners and
is suitable for mounting to many types of surfaces. Refer to Figure 2.