GAI-Tronics 262-001 Manual de usuario
Pub. 42004-173D
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
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
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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,
C (picofarads/mile) 316,800 pF/mile
Maximum resistance,
R (ohms/mile) 271 171 107 85 67
*Ring signal loss,
decibels (dB/mile) -16 -12 -8 -6 -4
*Nominal ring signal is 98 dB @ 10 feet.
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Installing the Model 262-001 Indoor Telephone
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 Telephone
The Model 272-001 Outdoor Telephone is intrinsically safe when connected in accordance with GAI-
Tronics 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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External Ringers
The Model 262-001 and 272-001 Intrinsically-Safe Telephones are designed with loud broadcast ringers.
In some instances, however, it is advantageous to install external ringers on these units. Examples of such
situations include areas where the noise level exceeds 95 dB, and locations where a large area must be
covered by a single telephone.
To install an external ringer with the Model 262-001 and 272-001 Telephones, it is necessary to attach an
explosion-proof relay to the telephone line. The relay must not interfere with the direct connection
between the Model 263 IBU and the intrinsically-safe telephone. The relay must also be wired to an
explosion-proof ringer purchased separately by the customer. The customer must install sealed conduit
from the relay to the ringer. Refer to Figure 2. Contact your local electrical distributor for information on
relays and explosion-proof ringers.
Figure 3. An Alternative Explosion-proof Ringer Placement using a
Model 269 I.S. Explosion-Proof Ringer Relay
Figure 2. Placement of Explosion-proof Ringer in the Hazardous Area
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Operation
1. Lift the I.S. telephone handset to place a call.
2. Adjust handset receiver volume control, if necessary, by pressing the handset pressbar.
NOTE:Pressing the handset pressbar increases the volume in increments of 4 dB. The volume starts
at 0 dB and increases to a maximum volume of 8 dB. Pressing the pressbar a fourth time will return
the volume to -4 dB. Pressing the pressbar one more time will return the gain to 0 dB.
3. Dial the desired number.
4. After completion of the call, place the handset on-hook.
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Maintenance
This section includes two troubleshooting charts designed to quickly pinpoint the source of problems.
Troubleshooting
NOTE:It may be advantageous to temporarily connect a Model 262-001 or 272-001 Telephone panel
directly to the output terminals of the Model 263 IBU when troubleshooting. Then, using the charts
below, the cause of the problem should more easily be determined.
Non-Equipment Related Problems
Problem Solution
The I.S. phone is inactive with
no lights on the IBU when the
phone is off-hook.
1. Check the ac power to the Model 263 IBU.
2. Check the ac fuse F4 at the Model 263 IBU.
3. Ensure there is no wiring open at the I.S. phone.
1. If the I.S. phone has a wiring short, the IBU lights will be lit in
the following pattern: O= On, P= Off
ISLOOP
O
LOCK
P
HOOK
P
TELCO
P
2. If the TELCO line has an open, the IBU lights will be lit in the
following pattern: O= On, P= Off
ISLOOP
O
LOCK
O
The I.S. phone has no dial tone.
HOOK
O
TELCO
P
The lights on the IBU flash
randomly. The I.S. phone has an intermittent wiring short. The short may be
between the conductors or either/both conductor(s) to ground/shield.
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Equipment-Related Problems
Problem Solution
There is no incoming ring tone. 1. Check the I.S. telephone panel.
2. Check the Model 263 IBU.
No receiver audio, no sidetone,
and cannot hear touch tones
when pressed.
1. Check the I.S. telephone panel.
2. Check the Model 263 IBU.
3. There may be a wiring open or a short in the connecting cable.
Cannot dial out, but can hear
touch tones when pressed. 1. Check the Model 263 IBU.
2. There is no TELCO connection or it is faulty.
I.S. phone appears inactive. 1. Check the I.S. telephone panel.
2. Check the Model 263 IBU.
3. Ensure there is no wiring open in the connecting cable or at the I.S.
phone.
CAUTION
Any field repairs on the intrinsically-safe design of the phone are strictly prohibited. Any such
change will void ALL hazardous approvals. Please contact the GAI-Tronics Field Service Department at
800-492-1212 inside the USA, or 610-777-1374 outside the USA, for the Regional Service Center closest
to you.
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Lightning Protection
Telephone lines are susceptible to lightning strikes and must be properly protected and maintained. On-
premise line protection is usually provided at the building entrance by the responsible telephone company
when installed. It is common that this protection is neglected after installation.
Degradation of conventional protection, such as carbon blocks or gas discharge types, will occur with
each lightning strike. To ensure safe operation, protective elements should be replaced frequently and
checked for proper connection and grounding. Gas discharge types are by far the most robust, cost-
effective means of protection.
The registered I.S. equipment meets all isolation and safety requirements of FCC, Part 68, DOC CS-03,
UL 913, and CSA C22.2-No. 157; however, lightning strikes are not predictable or considered to be a
condition of fault likely to occur in practice as defined by the guidelines for intrinsic safety. Therefore, it
is imperative that the user employ and maintain a proper lightning protection scheme. This is true for all
hazardous area equipment and all telecommunications equipment subject to lightning.
Figure 4. Example of Lightning Protection Design
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