150-506-100-03
Installation
HRE-506 List 1 and List 2
March 28, 2000
21
Opening an Air-Filled Enclosure
To open an air-filled HRE-506 List 2, perform these steps:
1
Locate the pressure cutoff valve, as shown in
2
Close the pressure cutoff valve by rotating the valve clockwise one full turn. This blocks the pressure from
the main cable.
3
Release the remaining pressure within the enclosure by depressing the center pin of the air stem.
4
Unlock the enclosure. Loosen cover clamp and twist the stainless steel dome slightly to break the seal.
5
Remove the cover clamp and the stainless steel dome from the enclosure.
C
LOSING
THE
E
NCLOSURE
1
Inspect the enclosure cover and baseplate for dirt, moisture, or mechanical damage, especially around the
baseplate flange and O-ring. Remove any accumulation of dirt or moisture from the cover and replace any
damaged components.
2
Remove the two desiccant bags from the plastic storage bag and place them in the enclosure.
3
Fasten the slot retainer bracket in place.
4
Slide the stainless steel dome over the card cage and position it on the O-ring and baseplate.
5
Lubricate the threads of the cover clamp T-bolt with an anti-seize compound.
6
Position the cover clamp around the base of the cover and the baseplate flange. Handtighten the T-bolt
securely, then torque the T-bolt to between 10 and 15 inch-pounds (1.1 and 1.7 Newton-meters).
7
If you are pressurizing an HRE-506 List 2 from a portable pressure bottle, block air from the cable stub in the
splice case by placing an air-dam in the stub according to local practice to prevent pressure leakage back into
the main cable. Verify that the air-cutoff valve is off or turned fully clockwise. Turn on the pressure from the
external source.
8
If you are pressurizing an HRE-506 List 2 from the main cable, open the air-inlet tube by turning the air valve
1 full turn counterclockwise. Allow the enclosure to pressurize from the main cable through the cutoff stub.
9
If you are pressurizing an HRE-506 List 1 which has been converted to a pressurized version (the breather
vent has been replaced with a pressure relief valve), verify that the air cutoff valve is fully open or turned
counterclockwise. Turn on the pressure from the external source.
10
If you are pressurizing the enclosure as described above and the unit will not monitor pressurization, check
the O-ring and enclosure for leaks by painting the enclosure with a pressure-testing solution such as soap and
water. If you detect a leak, tighten the T-bolt and tap lightly around the cover clamp. Repeat as necessary until
the cover is sealed.
11
Secure the HRE-506 with a padlock. This step is not required for manhole-mounted enclosures. However, a
locking assembly is provided, if needed.
Exercise care when removing and handling the stainless steel dome. A damaged stainless steel
dome may not seal properly when replaced.
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.