Installation
150-504-100-03
12
August 1, 2002
HRE-504 List 1, List 1B, and List 2
G
ROUNDING
THE
E
NCLOSURE
Use the standard grounding procedure in
“Grounding a Pole Mounted Enclosure”
below.
The HRE-504 requires a resistance of 25
W
or less to ground as measured with a Megger-type ohmmeter.
Have the following equipment ready before you begin:
•
One bullet bond
•
One ground rod for pole mounted enclosures (may require more than one rod)
•
One Megger-type ohmmeter
•
One 6 AWG cable
To establish enclosure ground, the cable stub’s 8 mil aluminum shield is attached to the card cage mounting
brackets through a braided jumper wire. This jumper wire connects the stub aluminum shield to the enclosure
ground lug, as shown in
. The jumper 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 jumper wire to the card cage mounting bracket.
Grounding a Pole Mounted Enclosure
Use the following procedure to ground a pole or pedestal mounted enclosure, as shown in
1
Bond the main cable shield through the splice case using bullet bond.
2
Drive the ground rod into the ground near the enclosure location.
3
Use a Megger-type ohmmeter to measure the resistance between enclosure ground and the ground rod. The
resistance must be 25
W
or less.
4
If the resistance requirement is met, proceed to
. If the requirement is not met, follow local practices to
lower the resistance to ground to comply with the requirement before proceeding to
5
Use 6 AWG cable to connect the grounding lug on the enclosure to the ground rod. Torque the grounding lug
to 18 and 22 inch-pounds (2.0 and 2.5 Newton/meters).
The 8 MIL aluminum shield on the stub is connected to the card cage mounting brackets by a
braided shield ground wire. This wire connects the shield to the enclosure ground lug. The wire
may be temporarily removed from the enclosure ground lug when troubleshooting ground
faults. Loosen the enclosure screws that secure the braided shield ground wire to the card cage
mounting bracket.
The braided shield ground wire should be reconnected to the card cage bracket after completing
the ground fault test. This ensures that the stub’s shield is properly grounded (required to
reduce the possibility of shield corrosion and lightning damage).
The stub’s screen divider is an insulated floating divider separating the Group 1 and Group 2
pairs from the Group 3 and Group 4 pairs. Do not ground this screen divider: doing so could
result in degraded performance.
Ground the HRE-504 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-504 is improperly grounded, the LPU surge arrestors will not work and the enclosure
will be unprotected.
Summary of Contents for 150-2202-01
Page 4: ...Inspecting the Shipment 150 504 100 03 iv August 1 2002 HRE 504 List 1 List 1B and List 2...
Page 8: ...List of Tables 150 504 100 03 viii Augusr 1 2002 HRE 504 List 1 List 1B and List 2...
Page 53: ...Appendix D Abbreviations 150 504 100 03 46 August 1 2002 HRE 504 List 1 List 1B and List 2...
