Installation
150-506-100-03
14
March 28, 2000
HRE-506 List 1 and List 2
G
ROUNDING
Use the standard grounding procedure in
“Grounding a Pole Mounted Enclosure”
below.
The HRE-506 requires a resistance of 25
Ω
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
Grounding a Pole Mounted Enclosure
Use the following procedure to ground a pole or pedestal mounted enclosure. See
.
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
Ω
or less.
4
If the resistance requirement is met, proceed to
. If the resistance requirement is not met, follow local
practices to lower the resistance to ground to comply with the requirement before proceeding to
.
5
Use a 6 AWG cable to connect the grounding lug on the enclosure to the ground rod.
6
Use a 6 AWG cable, connect the main cable shield to the ground rod.
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. The wire can be removed by unscrewing the 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 which is 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 THE SCREEN
DIVIDER. Doing so could result in degraded performance.
Ground the HRE-506 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-506 is improperly grounded, the LPU surge arrestors will not work and the enclosure
will be unprotected.