Pub. 42004-178D
Model 263 Isolation Barrier Unit (IBU)
Page: 2 of 13
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-178d.doc
03/06
Installation
Installation Guidelines
When installing any GAI-Tronics telephone equipment, please adhere to the following guidelines to
ensure the safety of all personnel:
•
NEVER install telephone wiring during a lightning storm.
•
Install a UL Listed lightning arrestor
on any phone installed where the phone or phone cable is at
risk of being exposed to lightning strikes. The lightning arrestor must be installed as close to the
phone as possible to maximize the protection. The lightning arrestor must not be installed within the
enclosure supplied with the phone.
•
NEVER install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•
NEVER touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
•
USE CAUTION when installing or modifying telephone lines.
•
Install UL Listed telephone line suppressor (customer-supplied) on the telephone line.
•
Use silicone sealant or equivalent around and inside all conduit entries
Installation of the IBU
The Model 263 Isolation Barrier Unit provides an intrinsically-safe circuit when connected in accordance
with GAI-Tronics Pub. 42004-380, Control Drawing 73242. It must be installed in a non-hazardous
location. See Figure 1 for a typical installation.
The Model 263 Isolation Barrier Unit interior includes a power switch selector, a ring pitch adjustment,
and four troubleshooting LEDs. The IBU housing is composed of two modular subassemblies, the front
panel and the rear enclosure assembly, for easy installation and wiring.
Figure 1. Typical intrinsically-safe installation
