Pub. 42004-173D
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 262-001 and 272-001
Intrinsically-Safe Telephones
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
The GAI-Tronics Model 262-001 Indoor and Model 272-001 Outdoor Intrinsically-Safe (I.S.)
Telephones, and Model 263 Isolation Barrier Units (IBU) are designed to be installed in hazardous areas.
The IBU or rack-mount card unit is placed in a
non-hazardous area up to one mile from the
telephone. This limits the energy levels going
to the hazardous area.
For convenience, an I.S. telephone and the IBU
can be purchased together under a single model
number—Model 261-001 for indoor use and
Model 271-001 for outdoors. However, for
rack-mount configurations or special
applications, the telephones and IBU can be
purchased separately.
These telephones are constructed of durable
glass-reinforced polyester, which is highly
resistant to chemicals and weather. Both I.S.
telephone are rated Type 3R (rainproof).
Figure 1. Model 262-001 Intrinsically-Safe Telephone
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
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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
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Wiring Requirements
Design Limits
In order to be intrinsically safe, energy and energy storage must be constrained to “safe” levels in
hazardous area apparatus. Wiring inherently has capacitance formed by a dielectric material between two
conductors. A buildup of this capacitance can form a surge of electricity, a dangerous situation in a
hazardous area.
Intrinsically-safe telephones require cabling that will limit the amount of capacitance formed. The
limitation on cable length was set by Underwriter’s Laboratory (UL) based on test results. This “worst
case” cable available was found to have a capacitance of 60 picofarads/foot. Therefore, UL set the cable
limitation at one mile, the length at which this worst-case cable capacitance level was still within
acceptable bounds. Cable types with less capacitance have been specified to allow connection distances
over one mile.
For example: GAI-Tronics Model 60059-001 and 60021-301 cables allow connection distances of up to
1.5 miles.
Shielded Cable
Where multiple intrinsically-safe telephone wires are routed together, shielded cable should be used. The
use of shielded cable prevents cross-talk from occurring between multiple intrinsically-safe telephone
circuits. The shield must be grounded to an intrinsically-safe ground and connected only at the IBU.
Wiring Guidelines/Control Drawing
The Model 262-001 and 272-001 I.S. Telephones must be installed in accordance with GAI-Tronics
control drawing 73242 (Pub. 42004-380). In addition, the NEC and the CEC provide additional
installation details that are recommended for safe installation.
General Wire Types
24 AWG 22 AWG 20 AWG 19 AWG 18 AWG
Maximum capacitance,
316,800 pF/mile
C (picofarads/mile)
Maximum resistance,
271 171 107 85 67
R (ohms/mile)
*Ring signal loss,
-16 -12 -8 -6 -4
decibels (dB/mile)
*Nominal ring signal is 98 dB @ 10 feet.
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Model 262-001 and 272-001 Intrinsically-Safe Telephones Page: 4 of 14
Installing the Model 262-001 Indoor T elephone
The Model 262-001 Indoor Telephone is intrinsically safe when connected in accordance with
GAI-Tronics drawing 73242 (Pub. 42004-380).
1. Carefully loosen the four front panel screws, and slowly remove the front panel assembly.
2. After the front panel is disconnected, put it aside, and mount the enclosure to the wall using four ¼-20
machine screws with nuts and washers or #14 wood screws of the appropriate length depending on
the mounting surface. Refer to drawing 73242 (Pub. 42004-380) for details.
3. Feed the wire through the hub at the bottom of the enclosure.
4. Refer to drawing 73242 (Pub. 42004-380) for wiring details.
5. Replace the front panel assembly, and tighten the four front panel screws.
WARNING
Substitution of components may impair intrinsic safety.
Installing the Model 272-001 Outdoor T elephone
The Model 272-001 Outdoor Telephone is intrinsically safe when connected in accordance with GAITronics drawing 73242 (Pub. 42004-380).
1. Open the front door of the enclosure and locate the four outermost screws.
2. Loosen these four screws, and carefully pull the enclosure apart until there is a slight resistance on the
left side of the enclosure.
3. Separate the front half of the enclosure from the rear half by pulling on the left side of the enclosure
until the hinge plugs pull loose.
4. Put the front half of the enclosure aside, and mount the enclosure to the wall using four ¼-inch screws
of the appropriate length, depending on the mounting surface.
5. Feed the station wire through the hub at the bottom of the enclosure.
6. Refer to drawing 73242 (Pub. 42004-380) for wiring details. The station wire is the pair of wires
coming directly from the GAI-Tronics Model 263 Isolation Barrier Unit. This unit must not be
connected directly to the telephone system.
7. Close the front half of the enclosure, and secure it by tightening the four outermost screws.
WARNING
Substitution of components may impair intrinsic safety.
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System Setup
GAI-Tronics recommends taking the following steps to ensure a safe and trouble-free installation:
1. Install the Model 263 Isolation Barrier Unit (IBU) and wire it completely, except for the hazardous
area signal wires.
WARNING
The unit must be wired in accordance with
drawing 73242 (Pub. 42004-380) to ensure intrinsic safety.
2. Next, temporarily connect the I.S. telephone to the IBU with a short pair of conductors, and operate
the unit by making a test phone call. If any problems are detected, see the Troubleshooting section.
3. Call the I.S. telephone from another telephone, and adjust the
RING PITCH (located on the IBU) to
the desired pitch.
4. Disconnect the I.S. telephone and install it in the intended permanent location.
WARNING
The unit must be wired in accordance with
drawing 73242 (Pub. 42004-380) to ensure intrinsic safety.
5. Make a call from the I.S. telephone. If any problems are detected, see the Troubleshooting section.
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