GAI-Tronics 785-002 24 V DC Explosion-proof Page/Party Handset Stations - Manual (Page 4)

Pub. 42004-157E
Model 780/785-002 and 7805/7855-002 24 V DC Explosion-proof Handset Stations Page 4 of 13
f:\standard ioms - current release\42004 instr. manuals\42004-157e.doc
08/13
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
bottom two 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 weatherproof nonmetallic
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.
Conduit Installation
Refer to Pub. 42004-182, which is shipped with this unit. This publication details how to maintain the
explosion-proof integrity of the station.
NOTE
External conduits in areas with Class I, Group C and D areas must have gas seals
not more than 18 inches (457 mm) from the station enclosure. External conduits in Class II and
Class III areas must have seals if the conduit system is not dust-tight.
Wiring
After the station has been mounted, use a 7/16-inch wrench to open the front panel of the station to access
the Termination PCBA. Refer to Pub. 42004-182 for wiring details.
Feed the wiring through the conduit and into the enclosure. Follow the wire colors carefully—these
colors correspond to GAI-Tronics 60029 or 60038 Series cable. The wires must be spade-lugged and
connected carefully and completely to the terminal block. An improper termination may result in
diminished station performance.
Before closing the station, plug the power interconnect cable from the front of the enclosure into the
connector on the power supply card in the rear enclosure.
NOTE
All the bolts must be installed to maintain the integrity of the explosion-proof
construction.