Installation
150-506-100-03
16
March 28, 2000
HRE-506 List 1 and List 2
Grounding a Flat Surface Mounted Enclosure
To ground a flat surface-mounted enclosure, perform the following steps:
1
Bond the main cable shield through the splice case using bullet bond.
shows the location
of the slice case and bullet bond.
2
Using a Megger-type ohmmeter, measure the resistance between enclosure ground and the ground connection
point in the manhole. The resistance must be 25
Ω
or less.
3
If the requirement is met, proceed to
. If the requirement is not met, follow the procedure normally used
for mounting the enclosure to lower the resistance to ground to comply with the requirement in
, then
proceeding to
.
4
Using 6 AWG cable, connect the ground lug on the HRE-506 to the ground connection in the manhole.
Torque the grounding lug to between 18 and 22 inch-pounds (2.0 and 2.5 Newton-meters).
5
Using 6 AWG cable, connect the main cable shield to the ground connection in the manhole.
6
Use a Megger-type ohmmeter, measure the main cable shield resistance to manhole ground. The resistance
must be 5
Ω
or less.
7
If the requirement is not met, ground the main cable shield every 2,000 feet (610 m).
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 to safeguard personnel.
If the HRE-506 is improperly grounded, the LPU surge arrestors will not work and the enclosure
will be unprotected.
If the feeder cable’s shield is bonded to the stub’s shield, the green insulated or bonded
stub shield wire should be disconnected from the metal card cage base. This is
recommended to reduce service affecting noise from being injected into the doubler
circuits from circulating ground loop currents, and help inhibit corrosion.
