PairGain HiGain HRE-458 User manual

HIGAIN REMOTE THERM-O-NATOR
ENCLOSURE
HRE-458 List 1, List 1B, and List 2
Product Catalog: 150-458-100-05
CLEIs: T1RHNBV4 and T1RHNBW4

150-458-100-05
ii February 23, 2000 HRE-458 List 1, List 1B, and List 2
Revision History of This Manual
Copyright
February 23, 2000
© 2000 ADC DSL Systems, Inc. All rights reserved.
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of ADC DSL Systems, Inc.
No right, license, or interest to such trademarks is granted hereunder, and you agree that no such right, license, or interest
shall be asserted by you with respect to such trademark.
Other product names mentioned in this document are used for identification purposes only and may be trademarks or
registered trademarks of their respective companies.
Disclaimer of Liability
Information contained in this document is company private to ADC DSL Systems, Inc.,and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice.
In no event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and ADC further
disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of
liability applies to all products, publications and services during and after the warranty period.
Revision Release Date Revisions Made
01 April 30, 1998 Initial Release.
02 October 9, 1998 Revision to Figure 10, minor corrections.
03 June 22, 1999 Added Figure 10 and updated Figures 3, 4, 7, 8, and 9.
04 February 23, 2000 Replaced plastic valves with all-metal valves.
05 August 9, 2002 ADC Rebranding

150-458-100-05 Using This Manual
HRE-458 List 1, List 1B, and List 2 February 23, 2000 iii
USING THIS MANUAL
Two types of messages, identified by icons, appear in the text.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and inspect the contents for signs of damage. If the equipment has been damaged in
transit, immediately report the extent of damage to the transportation company and to ADC. Order
replacement equipment, if necessary.
•Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short
or irregular, contact ADC as described in the Warranty located inside the back cover. If you must store the
equipment for a prolonged period, store the equipment in its original container.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of personal injury.

Inspecting Shipment 150-458-100-05
iv February 23, 2000 HRE-458 List 1, List 1B, and List 2

150-458-100-05 Table of Contents
HRE-458 List 1, List 1B, and List 2 February 23, 2000 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features..............................................................................................................................................1
Applications .......................................................................................................................................1
Functional Description.......................................................................................................................2
Gel-filled Stub Unit .............................................................................................................2
Air-filled Stub Unit..............................................................................................................3
Pressurized Applications....................................................................................................................3
Installation___________________________________________________________________________ 6
Unpacking and Inspecting Your Shipment........................................................................................6
Mounting............................................................................................................................................7
Small Pole or Pedestal Mounting ........................................................................................8
Large Pole or Pedestal Mounting ........................................................................................8
Flat Surface Mounting.........................................................................................................9
Rack Mounting ..................................................................................................................10
Grounding ........................................................................................................................................11
Grounding a Pole Mounted Enclosure...............................................................................11
Grounding a Flat Surface Mounted Enclosure..................................................................13
Slot Chassis Ground Connections....................................................................................................15
Doubler and Repeater Installation....................................................................................................15
Detaching the Dome from the Baseplate .........................................................................................16
Opening the HRE-458 Enclosure.....................................................................................................17
Closing the HRE-458 Enclosure......................................................................................................17
Pivoting the Enclosure.....................................................................................................................18
Appendix A - Specifications____________________________________________________________ 19
Appendix B - Technical Reference ______________________________________________________ 20
CLEI Code and P1 Labels................................................................................................................20
HRE-458 Enclosure Information.....................................................................................................21
Stainless-steel Therm-O-Nator Dome ...............................................................................21
Card Cage..........................................................................................................................21
Lightning Protection Unit (LPU).......................................................................................22
Cable Stub and Pressurization...........................................................................................23
Vented-to-Pressurized Conversion Procedure...................................................................24
Spare Connections.............................................................................................................25
Order Wire Connections....................................................................................................25
General Deployment Rules................................................................................................25
HRE-458 Wiring..............................................................................................................................27

Table of Contents 150-458-100-05
vi February 23, 2000 HRE-458 List 1, List 1B, and List 2
HRE-458 Maintenance.................................................................................................................... 29
Splicing ............................................................................................................................. 29
Pre-splicing Procedure...................................................................................................... 29
Splicing Procedure............................................................................................................ 31
Post-splicing Procedure..................................................................................................... 32
Replacement Parts........................................................................................................................... 34
Replacing the Stainless Steel Dome Cover....................................................................... 34
Replacing LPU Arrestor Boards ....................................................................................... 34
Valve Replacement Procedures....................................................................................................... 35
Pressure Relief Valve........................................................................................................ 35
Breather Vent Valve.......................................................................................................... 36
Air Stem Valve..................................................................................................................36
Pressure Cutoff Valve....................................................................................................... 37
Appendix C - Product Support _________________________________________________________ 38
Appendix D - Glossary ________________________________________________________________ 39
Certification and Warranty______________________________________________ Inside Back Cover

150-458-100-05 List of Figures
HRE-458 List 1, List 1B, and List 2 February 23, 2000 vii
LIST OF FIGURES
1. HRE-458 Gel-filled Remote Enclosure.........................................................................................................2
2. HRE-458 Air-filled Remote Enclosure .........................................................................................................4
3. Metal Valves..................................................................................................................................................5
4. HRE-458 Pivot-Mounting Bracket................................................................................................................7
5. Grounding for Pole-Mounted Unit ..............................................................................................................12
6. Grounding for Flat Surface-Mounted Unit..................................................................................................14
7. HRE-458 Enclosure.....................................................................................................................................16
8. HRE-458 Bar Code and P1 Label Locations...............................................................................................20
9. HRE-458 with Cover Removed...................................................................................................................22
10. Lightning Protection Unit (LPU).................................................................................................................23
11. Wiring Diagram Gummed Label.................................................................................................................28
12. Cable Stub Construction..............................................................................................................................29
13. Dress Splice in Splice Case .........................................................................................................................31
14. Post-splicing Procedure...............................................................................................................................32
15. Screen Folding Diagram..............................................................................................................................33

List of Tables 150-458-100-05
viii February 23, 2000 HRE-458 List 1, List 1B, and List 2
LIST OF TABLES
1. Mounting Details............................................................................................................................................ 7
2. Slot Pin Assignments ................................................................................................................................... 15
3. Bar Code and P1 Label Information ............................................................................................................ 20
4. Deployment Rules for Doublers and Remote Units..................................................................................... 26
5. Binder Group Stub Cable Termination........................................................................................................ 27
6. Inner Statial Pair Cable Stub Wire Assignment........................................................................................... 28
7. Replacement Part Kits.................................................................................................................................. 34

150-458-100-05 Overview
HRE-458 List 1, List 1B, and List 2 February 23, 2000 1
OVERVIEW
This document describes the HiGain®Remote Therm-O-Nator HRE-458 gel-filled (List 1, List 1B) and air-filled
(List 2) enclosures and provides installation instructions for these enclosures.
FEATURES
The following features are included on the HRE-458 HiGain Remote Therm-O-Nator enclosure:
•Ten doubler card slots that support:
–HDU-437 and HDU-407 (DDS Mechanics), HDU-439 (Dual 239 T1 Mechanics), and HDU-409 (Single
T1 Mechanics) Full T1 doublers
–HDU-217 (DDS Mechanics) and HDU-219 (Dual 239 T1 Mechanics) Fractional T1 doublers
–HDU-239 T1 repeaters
•30-foot (9.144 m), gel-filled or air-filled, 52-pair cable stub
•Flat surface, rack, or pole mount
•Primary surge protection
•Seamless, stainless steel cover with Therm-O-Nator heat exchange unit
•Single stub access
•Tilt forward mounting
•Unique card guides that automatically adapt to accommodate any of the three mechanics form factors
currently supported
APPLICATIONS
The primary application of the HRE-458 is to house HiGain doubler units in a High-bit-rate Digital Subscriber
Line (HDSL) T1 transmission system. The remote enclosure is designed to protect HiGain doubler units from
potentially harmful conditions found in outdoor environments. The enclosure comes in either a single gel core stub
(List 1, List 1B) or air core stub (List 2) unit.
The HRE-458 gel core List 1, List 1B unit is intended for aboveground, pole-mounting applications that do not
require pressurization through the cable stub. However, if you prefer to pressurize the unit, it can be locally
pressurized by an optional exterior air cutoff valve (see Figure 2 on page 4). The HRE-458 air core List 2 unit is
intended for underground installations. It can be pressurized from the main feeder cable through its air core stub.
The pressurization prevents the enclosure from flooding when mounted in underground manholes. Both units are
similar in that they have primary gas tube surge protection on all cable pairs.
The HRE-458 can be used to house the following doubler and repeater units. All of these doublers and repeaters
share the same generic slot pin assignments as shown in Table 2 on page 15.
•HDU-439, HDU-437, HDU-409, or HDU-407 Full T1 (1.544 Mbps) unit
•HDU-219 or HDU-217 Fractional T1 (772 Mbps) unit
•ISDN repeater
•DDS repeater
•239 T1 repeater

Overview 150-458-100-05
2 February 23, 2000 HRE-458 List 1, List 1B, and List 2
FUNCTIONAL DESCRIPTION
The following section discusses the function of each component on the HRE-458. The enclosure consists of an
aluminum card cage with a holding capacity for up to ten doubler units, a stainless steel composite baseplate, and
a stainless steel cover that maintains weathertight integrity and provides efficient heat exchange to expel the heat
generated within the units.
Gel-filled Stub Unit
The gel-filled cable stub on the List 1, List 1B unit (Figure 1) is equivalent to an ALP FTS-PIC filled core
telephone cable (refer to Table 5 on page 27 for a complete description of the cable stub). The unit is intended for
aboveground applications. Standard color codes are used for pair identification with color compounds chosen for
electrical balance and permanency. An inner core jacket protects the core and provides improved mechanical and
electrical characteristics. The outer jacket consists of material that provides protective covering from sunlight,
atmospheric temperatures, ground chemicals, and stresses expected in standard installations.
The gel-filled List 1, List 1B unit is similar to the air-filled List 2 unit except that a breather vent valve on the List
1, List 1B replaces the internal pressure cutoff valve on List 2. The breather vent valve allows the circulation of
outside air through the List 1, List 1B enclosure when it is not pressurized. The enclosure must breathe to prevent
the buildup of excessive moisture and other damaging contaminants from occurring within the enclosure.
An optional pressure relief valve is included in the shipping kit for the List 1, List 1B unit. The kit comes in a
small plastic bag that is attached to the brown/white spare pair shrink tab. Use the pressure relief valve in place of
the breather vent valve to locally pressurize the List 1, List 1B unit. See page 24 for conversion details.
Figure 1. HRE-458 Gel-filled Remote Enclosure
The cable complies with the requirements of the American National Standards Institute
(ANSI) and the Insulated Cable Engineers Association (ICEA) S-84-608-1994 and REA
PE-89, respectively.

150-458-100-05 Overview
HRE-458 List 1, List 1B, and List 2 February 23, 2000 3
Air-filled Stub Unit
The air-filled cable stub on the List 2 unit (Figure 2 on page 4) is equivalent to an ALP FTS-PIC air core telephone
cable (refer to Table 5 on page 27 for a complete description of the cable stub). The air-filled unit is intended for
buried, aerial, and duct applications. Standard color codes are used for pair identification with color compounds
chosen for electrical balance and permanency. An inner jacket protects the core and provides improved
mechanical and electrical characteristics. The outer jacket provides protective covering that can withstand
exposure to sunlight, atmospheric temperatures, ground chemicals, and stresses expected in standard installations.
Air-filled Stub Pressurization
The unit has an internal pressure cutoff valve, air intake stem, and pressure relief valve. The air cutoff valve is
used to shut off the inlet air supply that is pumped from the main feeder cable through the 30-foot (9.144m) stub
into the HRE-458 enclosure.
•To shut OFF the inlet air supply, turn the air cutoff valve clockwise one full turn.
•To turn ON the inlet air supply, turn the air cutoff valve counterclockwise one full turn.
PRESSURIZED APPLICATIONS
For pressurized applications on the HRE-458 List 2, the Schrader air stem valve is used. A pressure gauge is
attached to the valve for the purpose of measuring the internal pressure of the enclosure. This valve is also used
to relieve the internal pressure prior to opening and removing the dome cover. This can be done by depressing the
center pin on the valve (see Figure 2 on page 4 and Figure 3 on page 5 for air stem valve and pin locations).
The cable complies with the requirements of ANSI/ICEA S-85-625-1996 and REA PE-22.
Depressurizing must be performed every time the cover is removed from either enclosure.
Failure to do so may cause personal injury or damage to the equipment.

Overview 150-458-100-05
4 February 23, 2000 HRE-458 List 1, List 1B, and List 2
Figure 2. HRE-458 Air-filled Remote Enclosure
An optional breather vent valve is enclosed in the List 2 shipping kit. This assembly is used to replace the pressure
relief valve if the List 2 is not locally pressurized. The assembly allows the enclosure to breathe and keeps the
internal atmosphere free of harmful contaminants. The five metal valves are shown in Figure 3 on page 5.
Two O-rings are required between the brass fitting and adapter of the pressure relief valve, the
brass fitting and breather vent valve, the brass fitting and breather adapter of the air stem
valve, and the body housing and limiting nut of the pressure cutoff valve. Without the presence
of both O-rings in each case, a proper seal cannot be achieved.

150-458-100-05 Overview
HRE-458 List 1, List 1B, and List 2 February 23, 2000 5
Figure 3. Metal Valves

Installation 150-458-100-05
6 February 23, 2000 HRE-458 List 1, List 1B, and List 2
INSTALLATION
This section describes the setup and installation of the HRE-458.
UNPACKING AND INSPECTING YOUR SHIPMENT
When you receive the equipment, inspect it for signs of damage. If damage has occurred, immediately report the
extent of damage to the transportation company and to ADC (see “Appendix C - Product Support” on page 38 for
more information).
Your shipment should consist of:
•One HRE-458
•HiGain Remote Therm-O-Nator Enclosure HRE-458 List 1, List 1B, and List 2 User Manual
Before installing the HRE-458, unpack and inspect it for missing components and physical damage that may have
occurred during shipping. To unpack the enclosure:
1Remove the HRE-458 from its shipping carton.
2Perform an inventory to verify that all equipment listed on the packing list is present.
3Inspect the enclosure for shipping damage.
4Check the card cage for any sign of breakage.
5Check the O-ring for any sign of damage.
6Find and loosen the retaining screws at the rear base of the card cage.
7Tilt the card cage on its hinge.
8Lower the card cage to its level position and tighten the screws to lock it in position. ADC recommends
always keeping the card cage in a level, locked position.
9Report any damage to the carrier immediately.
If you must store the equipment for a prolonged period of time, store it in the container shipped
with your equipment.

150-458-100-05 Installation
HRE-458 List 1, List 1B, and List 2 February 23, 2000 7
MOUNTING
The HRE-458 may be mounted on a pole, pedestal, flat surface, or in a rack. The mounting details for the various
methods are as follows:
Figure 4. HRE-458 Pivot-Mounting Bracket
Table 1. Mounting Details
Mounting Page
Pole mounting with a pole diameter of less than 7 inches (17.78 cm) 8
Pole mounting with a pole diameter greater than 7 inches (17.78 cm) 8
Flat surface mounting 9
Rack mounting 10

Installation 150-458-100-05
8 February 23, 2000 HRE-458 List 1, List 1B, and List 2
Small Pole or Pedestal Mounting
Use the procedure below to mount the enclosure on a pole or pedestal where the pole is less than seven (7) inches
(17.78 cm) in diameter. Have the following equipment ready before you begin this procedure:
•Two 3/8-inch (0.952 cm) lug bolts, 4 inches (10.16 cm) long (minimum)
•Two 3/8-inch (0.952 cm) washers
•One wrench
•One pencil
•One drill with a 1/4-inch (0.635 cm) bit
1Select a convenient mounting location on the pole or pedestal.
2Remove the enclosure base mounting bracket from the pivot mounting bracket by removing the four bolts
that connect each sideplate (see Figure 4 on page 7).
3Position the pivot mounting bracket against the pole or pedestal (stub down) and mark the locations of the
center mounting lug bolt holes. Use the two middle mounting holes for this application.
4Place the pivot mounting bracket aside.
5Drill two 1/4-inch (0.635 cm) diameter holes 3-inches (7.62 cm) deep at the locations marked in Step 3.
6Start a lug bolt in the top center mounting hole and screw the bolt into the pole or pedestal approximately
two-thirds of an inch of its length.
7Insert a lug bolt into the center bottom hole of the pivot mounting bracket and screw the bolt into the mounting
hole.
8Secure the mounting bracket to the pole or pedestal by tightening the lug bolts.
9Reattach the enclosure to the pivot mounting bracket through the base mounting bracket and torque the
mounting bracket bolts between 30 and 40 inch-pounds.
10 If the cablestub connects to an underground cable, dress the cable down the pole or pedestal tothe splice case.
If the cable stub connects to an aerial cable, form a drip loop in the cable and dress it up the pole or pedestal
to the splice case.
Large Pole or Pedestal Mounting
Use the procedure below to mount the enclosure on a pole with a diameter greater than seven(7) inches (17.78
cm). Have the following equipment ready before you begin this procedure:
•Four 3/8-inch (0.952 cm) lug bolts, 4 inches (10.16 cm) long (minimum)
•Four 3/8-inch (0.952 cm) washers
•One wrench
Because of the weight and size of the enclosure, you may want to remove the dome before
mounting the enclosure. The enclosure must be mounted vertically. A shady location is also
preferred to minimize thermal stress. Refer to Table 4 on page 26 for thermal load capacity
information.
While mounting the enclosure, hold the enclosure securelyto prevent personal injury ordamage
to the enclosure.

150-458-100-05 Installation
HRE-458 List 1, List 1B, and List 2 February 23, 2000 9
•One pencil
•One drill with a 1/4-inch (0.635 cm) bit
1Select a convenient mounting location on the pole.
2Remove the enclosure base mounting bracket from the pivot mounting bracket by removing the four bolts
that connect each sideplate (see Figure 4 on page 7).
3Position the pivot mounting bracket against the pole (stub down) and mark the locations of the outer mounting
lug holes. Use the four corner mounting holes for this application.
4Place the pivot mounting bracket aside.
5Drill four holes 1/4- inch (0.635 cm) in diameter by 3-inches (7.62 cm) deep at the locations marked in Step 3.
6Start a lug bolt ineach of the two top matched bolt mounting slots and screw them into the pole approximately
two-thirds of an inch of the bolt length.
7Insert the lug bolts into the two holes on the outside bottom of the pivot mounting bracket. Begin tightening
the bolts.
8Secure the pivot bracket to the pole by tightening all lug bolts.
9Reattach the enclosure to the pivot mountingbrackets through the base mounting with the four sideplate bolts.
Torque the mounting bracket bolts between 30 and 40 inch-pounds.
10 If the cable stub connects to an underground cable, dress the cable down the pole to the splice case. If the
cable stub connects to an aerial cable, form a drip loop in the cable and dress it up the pole to the splice case.
Flat Surface Mounting
Use the procedure below to mount the enclosure on a flat surface or in a manhole. Leave enough room above the
enclosure for removing the cover. Allow at least 3 inches (7.62 cm) of clearance above the dome if the 31° tilt
feature is used. Allow at least 10 inches (25.4 cm) of clearance if the tilt feature is not used. Have the following
equipment ready before you begin this procedure:
•Four 3/8-inch (0.952 cm), 16 NC anchor bolts, 2-1/2inches (6.35 cm) long for wall mounting
•Four 3/8-inch (0.952 cm) washers
•One wrench
•One pencil
•One drill with a 1/4-inch (0.635 cm) bit
1Select a convenient mounting location on a wall.
2Remove the enclosure base mounting bracket from the pivot mounting bracket by removing the four bolts
that connect each sideplate (see Figure 4 on page 7).
While mounting the enclosure, hold the enclosure securely to prevent personal injury or
damage to the enclosure.
While mounting the enclosure, hold the enclosure securely to prevent personal injury or
damage to the enclosure.

Installation 150-458-100-05
10 February 23, 2000 HRE-458 List 1, List 1B, and List 2
3Position the pivot mounting bracket against the wall and mark the location of the four outside mounting holes.
Place the mounting bracket aside.
4Drill four holes 1/4-inch (0.635 cm) in diameter by 2-1/2inches (6.35 cm) deep at the locations marked in
Step 3.
5Start an anchor bolt in each of the two, top-matched, bolt-mounting slots and screw into the wall
approximately 2/3-inch of the bolt length.
6Insert the anchor bolts into the two bottom holes located on the outside of the pivot mounting bracket and
begin tightening the bolts into the two bottom holes of the pivot mounting bracket.
7Secure the pivot mounting bracket to the wall by tightening all anchor bolts.
8Reattach the pivot mounting bracket to the enclosure base mounting brackets with the four sideplate bolts and
torque the mounting bracket bolts between 30 and 40 inch-pounds.
9If the cable stub connects to an underground cable, dress the cable down the wall to the splice case. If the
cable stub connects to an aerial cable, form a drip loop in the cable and dress it up the wall to the splice case.
Rack Mounting
Use the procedure below when mounting the enclosure in a rack. Have the following equipment ready before you
begin this procedure:
•Four 3/8-inch thru-bolts for rack mounting
•Four 3/8-inch nonmetallic washers. Nonmetallic washers are required to avoid a ground loop that may result
if both the rack and the enclosure are grounded. ADC does not recommend using the rack ground for the
enclosure ground since the integrity of the rack ground is not 100 percent reliable.
•One wrench
1Select a convenient location on the cable rack.
2Position the enclosure so the outside slots and holes in the mounting bracket align with the mounting holes in
the cable rack.
3Slide the thru-bolts with nonmetallic washers through the outside slots and holes of the mounting bracket.
Begin tightening the bolts into the mounting holes.
4Secure the enclosure to the rack by tightening the thru-bolts.
Because of the weight and size of the enclosure, you may want to remove the dome before
mounting the enclosure. The enclosure must be mounted vertically. A shady location is also
preferred to minimize thermal stress. Refer to Table 4 on page 26 for thermal load capacity
information.
While mounting the enclosure, hold the enclosure securely to prevent personal injury or
damage to the enclosure.
The desiccant bags shipped with the units must be activated prior to closing the lid. Do this
by removing the bags from their plastic container and placing them inside the enclosure.

150-458-100-05 Installation
HRE-458 List 1, List 1B, and List 2 February 23, 2000 11
GROUNDING
The HRE-458 requires a resistance of 25 Ωor less to ground as measured with a megger-type Ohmmeter.
Have the following equipment ready before you begin the procedure:
•One bullet bond
•One ground rod for pole mounted enclosures (may require more than one rod)
•One megger-type Ohmmeter
•6 American Wire Gauge (AWG) cable
The 8 MIL aluminum shield around the cable stub is connected to the enclosure’s ground by attaching it to the
card cage mounting bracket with a braided shield ground wire as shown in Figure 9 on page 22. The purpose of
the ground wire is to connect the stub aluminum shield to the enclosure ground lug when the stub’s shield is not
bonded to the shield of the main feeder cable. The wire may need to be temporarily removed from the enclosure
ground lug when troubleshooting ground faults. This is accomplished by removing the screw that secures the
braided ground strap to the mounting bracket on the card cage.
Grounding a Pole Mounted Enclosure
Use the following procedure to ground a pole or pedestal-mounted enclosure (see Figure 5).
1Bond the main cable shield through the splice case using bullet bond.
2Drive the ground rod into the ground near the enclosure location.
The ground wire should be reconnected to the card cage bracket after completing the ground
fault test. This insures that the stub’s shield is properly grounded which is required to reduce
the effects of shield corrosion and lightning damage.
The screen divider on the stub is an insulated floating divider separating the pairs. DO NOT
GROUND THIS SCREEN DIVIDER. Doing so could result in degraded performance.
Make sure you ground the HRE-458 before splicing the cable stub into the main cable. This
grounding method (or an accepted local grounding method) must be in effect at all times to
safeguard personnel.
If the HRE-458is improperly grounded, the Lightning Protection Unit (LPU) surge arrestors will
not work and the enclosure will be unprotected.

Installation 150-458-100-05
12 February 23, 2000 HRE-458 List 1, List 1B, and List 2
Figure 5. Grounding for Pole-Mounted Unit
3Use a megger-type Ohmmeter to measure the resistance between enclosure ground and the ground rod. The
resistance must be 25 Ωor less.
4If the resistance requirement is met, proceed to Step 5. If the resistance requirement is not met, follow local
practice to lower the resistance to ground to comply with the requirement before proceeding to Step 5.
5Use 6 AWG cable to connect the grounding lug on the enclosure to the ground rod. Torque the grounding lug
between 18 and 22 inch-pounds.
6Use 6 AWG cable to connect the main cable shield to the ground rod.
ADC does not recommend connecting the maincable shield to the enclosure stub cable shield
because the stub shield is internally grounded to the enclosure ground lug. Connecting the
two shields creates a ground loop which could induce noise into the signal pairs. However, if
you choose to connect the main cable shield to the stub’s shield, and service affecting noise
is caused by the ensuing ground loops, disconnect the braid that connects the stub’s shield
to the enclosure’s ground plane.
HRE-458
No. 6 gauge wire
Grounding
lug
Ground
rods
No. 6 gauge wire
Bullet bond
Field side
CO side
Splice case 5 Ft. typical
Stub