AT&T
SPIRIT™ Communication
System
In Range–Out of Building
(IROB) Telephone
Installtion Instructions
1. General
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These installation instructions cover the description and installation of the Model
371 Protector Assembly. The Model 371 is designed to protect both the control
unit and the telephone sets of the SPIRIT™ Communications System from
foreign voltages caused by lightning, power contact, or power induction. Two (2)
Model 371 Protector Assemblies are installed whenever the station is outside of
the building but less than 1,000 feet from the SPIRIT™ system control unit
(Figure 1). The installation must follow requirements as outlined in Article 800-2
of the National Electric Code Handbook, and AT&T Standard Practice
#462-005-100. Other AT&T Practices that describe wiring for a non-fused protector
are identified in Section 6. (Section 6 also identifies how to order all of these
documents.)
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The Model 371 Protector Assembly contains no field-serviceable components. If
the protector must be replaced, the presence of hazardous voltages must be
investigated before touching any exposed metallic parts.
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Do not connect grounds to the following:
– Gas pipe
– Electric service branch circuit conduit
– Armor of BX cable
– Interior of any electrical box
Model 371 Protector Assembly
Installation by Trained
Technician Only
WARNING: Failure to follow these instructions could lead to
personal injury and property damage. It will also void
product warranties on all protected equipment.
WARNING: Hazardous voltages may be present.
Model 371 Protector Assembly consists of the following parts:
Model 349-2LG MKII, Primary Protector
Model 371-02, Secondary Protector
Model 151, Faceplate Ground Adapter Screw
Figure 1
SPIRIT™ CS IROB Installation
2.Description
The Model 371 IROB Protector Assembly is composed of a Model 349-2LG MKII
Primary Protector, a Model 371-02 Secondary Protector, and a Model 151 Faceplate
Ground Adapter Screw. Each protector is mounted in a separate housing with
a hinged cover.
2. Description (Cont’d)
Secondary Protector (Model 371-02)
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The housing includes four (4) screw terminals, a six-position rnodular jack, and
a 3 ft. ground wire terminated in a spade lug.
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The secondary protection consists of solid-state surge suppression and fusing
assembled on a printed wiring board.
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A tie wrap must be inserted through a tab on the hinged cover for security.
Primary Protector (Model 349-2LG MKII)
The housing includes a grommet for wire penetration, a No. 10 ground stud, and
four (4) terminal posts.
The primary protection consists of two (2) TII 356L encapsulated, heavy duty
three-electrode gas tube protector modules.
A tie wrap must be inserted through a tab on the hinged cover for security.
WARNING
To prevent damage to the
equipment and a potential
safety hazard, this device must
be grounded properly.
See installation notes for the
proper wiring instructions.
Figure 2B
Secondary Protector (Model 371-02)
Figure 2A
Primary Protector (Model 349-2LG MKII)
3. Installation
3. Installation (Cont’d)
Primary Protectors
Secondary Protector (Model 371-02)
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Two (2) Model 349-2LG MKII Primary Protectors are required for each IROB
telephone. One is placed where the cable from the control unit leaves the building.
The other is placed where the cable enters the building in which the IROB
telephone is to be located. These units are intended for mounting in indoor
locations only.
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An approved ground is required for proper operation of the IROB protector. An
approved ground is an acceptable power service ground, grounded building
concrete encased ground, or ring ground. The primary protector must be attached
to an approved ground using No. 10 AWG copper wire or equivalent. See section
5 for the proper selection of an approved ground.
In addition to the primary protectors, two (2) Model 371-02 Secondary Protectors
are required for each, IROB telephone installation. One must be placed within
3 ft. of the control unit's AC power outlet. The placement of the other secondary
protector is not as critical. It can be placed near the IROB telephone or near the
primary protector located in the same building as the IROB telephone, whichever
is more convenient for installation. These units are intended for mounting in indoor
locations only.
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Carefully unpack the secondary protector.
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Remove the upper housing from the base. This is accomplished by opening the
hinged cover which exposes a hexagonal head fastener. Turn the fastener
counterclockwise until the upper housing separates from the base.
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Select two of the mounting holes on the base. Remove the flashing from the holes
with the blade of a screwdriver.
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Position the base against the mounting surface, and mark the surface where the
mounting holes are to be drilled.
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Lay the base aside and drill lead holes in the mounting surface as marked. If
the surface is masonry, use the appropriate hardware.
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Using No. 10 3/4" pan head screws, fasten the base of the secondary protectors
to the mounting surface.
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Reattach the upper housing to the base of the protector.
The wiring and grounding must follow requirements for a non-fused protector as
outlined in Article 800-2 of the National Electrical Code Handbook, and AT&T
Standard Practice #462-005-100. Other AT&T Practices that describe wiring for
a non-fused protector are identified in Section 6.
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Prior to operation of the SPIRIT™ system, the integrity of the local telephone
company provided CO line protectors and grounding must be checked.
Verify that the local telephone company has done the following:
1 . Equipped the CO
2 . Grounded the CO protector ground lugs to an approved ground
3 . Bonded the CO protector ground to the ground point used for the AC
power service.
NOTE: Do not directly attach the primary protector to the ground lug of the
protector block for the CO lines.
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The exposed wire facility serving the station and control unit should enter the
building within 10 feet of an approved ground such as the AC power ground. The
National Electrical Code requires that the protector be located in, or immediately
adjacent to, the structure or building served, and as close as practicable to the
point at which the exposed conductors enter or attach.
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Carefully unpack the protector, and select two of the four mounting holes.
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Place the unit, with cover down, on some protected surface and remove the
flashing from selected holes with the blade of a screwdriver.
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With the door open, position the unit against the mounting surface, and mark
the surface where the mounting holes are to be drilled.
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Lay the unit carefully aside, and drill lead holes in the mounting surface as marked.
if the surface is masonry, use the appropriate hardware.
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Using No. 10 3/4" pan head screws, fasten the primary protector to the mounting
surface.
4. Wiring (Cont'd)
4. Wiring
Secondary Protector (Model 371-02)
Primary Protector (Model 349-2LG MKII)
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First, ground the protector be connecting a No. 10 AWG insulated solid copper
wire to the ground stud of each protector. This can be done be stripping off
approximately one inch of insulation and wrapping the bare wire around the ground
stud under the washers and nut.
Using appropriate fasteners, run the ground wire as straight as possible to the
nearest approved ground. See section 3, paragraph 2 for a description of the
approved ground. If a straight run is not possible, each bend must have a radius
of at least nine inches.
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Secure the end of the ground wire to the approved ground using a recommended
ground clamp and tag.
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Terminate the interbuilding wiring (22-24 AWG copper) on the terminal posts for
each primary protector as shown in Figure 2A, making sure that separate pairs
are used for the voice and data pair wiring.
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If the interbuilding wiring is exposed to the possibility of power cross, there must
be a fusible link near the point of entrance. The fusible link can be a 2 foot
(minimum) length of 26 AWG wire, under a metal enclosure or as part of a shielded
cable. If the interbuilding wiring is a cable and the cable has a metallic shield,
the shield must be bonded to the primary protector ground at both ends.
The control unit's secondary protector must be connected to the green wire ground
at the control unit's AC power outlet. Connect a 12 AWG insulated copper wire,
not exceeding 3 ft. in length, from the ground stud of the secondary protector
to the AC outlet’s green wire ground.
NOTE: The 3 ft. limit is necessary for the proper protection of the control unit during
a lightning surge.
NOTE: The recommended method for connecting to green wire ground at an AC
outlet is to use the Faceplate Ground Adapter Screw, included with the Protector
Assembly. This replaces the center screw of an AC outlet faceplate, providing secure
attachment for a spade lug to green wire ground. Once installed, check the Faceplate
Ground Adapter Screw for continuity to ground.
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The IROB telephone's secondary protector should be connected to the ground
stud of the primary protector (located at the entrance of the building containing
the IROB telephone). Another acceptable grounding point for this secondary
protector, is the green wire ground at an AC outlet located near the IROB telephone.
Connect a 12 AWG insulated copper wire from the secondary protector's ground
stud (Figure 2B) to the chosen grounding point.
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The R and G screw terminals on the secondary protector (Figure 2B) are for the
voice pair wiring, and the Y and B screw terminals are for the data pair wiring.
Connect the voice pair and data pair wiring between the secondary and primary
protectors, in each building. Reverse the data pair wires at the Y and B screw
terminals of the IROB telephone's secondary protector. This preserves the polarity
of the data signal. (The voice pair does not need to be reversed, since it is not
polarity sensitive.)
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When the wiring of the secondary and primary protectors is complete, connect
the control unit and IROB telephone to their respective secondary protectors using
a four-conductor, six-position modular cord. Route the modular cord from the
secondary protector’s RJ11 jack through the opening below the hinged cover, and
close the cover.
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When all work is complete, secure the secondary and primary protectors' covers
with a tie wrap or a security wire.
5. Selection of an Approved Ground
6. References
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National Electrical Code Handbook, 1984, published by the National Fire Protection
Association.
AT&T Standard Practices. These are available from:
Support Services
AT&T
99 Jefferson Road
Room 2E09
Parsippany, New Jersey 07054
Telephone Number: 201-581-5685
Fax Number: 201-428-1878
The first choice for approved ground uis some part of the power grounding system
(Figure 3). The National Electrical Code requires that the telephone and power
gorunds be bonded with No. 6 AWG copper wire or equivalent and that an
accessible means be provided at the electrical service for bonding other systems,
such as telephone systems, to the power. The bonding point means may consist
of an accessible metallic service entrance conduit, a power grounding conductor
(see the note below), or a connector located on the exterior of the power service
raceway or power service equipment (circuit breaker panel).
NOTE: In some cases this may be a ground conductor from the interior of the circuit
breaker panel which has been left accessible.
The approved ground should be installed according to NEC 800-2 and AT&T Practice
#462-005-100.
Figure 3
Grounding System
AT&T Standard Practices include the following:
462-005-100, "Station Protection and Grounds"
676-300-100, "Electrical Protection — Stations and Customer Equipment"
518-010-105, "Key Telephone System, Ground and Special Protection
Requirements"
462-262-2xx (entire section of Practices), "Wiring at Terminals"
462-xxx-xxx (entire division), "Drop and Block Wiring"