Overview
150-712-200-02
4
July 26, 2000
HRE-712 List 1 and List 2
P
RESSURIZED
A
PPLICATIONS
The HRE-712 List 2 can be pressurized either:
•
through its air-filled cable stub when connected to a pressurized main feeder cable
•
from the Schrader air-stem valve when connected to gel-filled feeder cables.
A pressure gauge can be attached to the air-stem valve for the purpose of measuring the internal pressure of the
enclosure. The air-stem valve is also used to relieve the internal pressure prior to opening and removing the dome
cover when pressurized through the stub. This can be done by pressing down on the valve’s center pin.
show the air-stem valve and pin locations.
An optional breather-vent assembly is enclosed in the HRE-712 List 2 shipping kit. The kit is a small plastic bag
that is attached to the spare pair (brown-white) shrink tab. This assembly is used to replace the pressure-relief
valve when the HRE-712 List 2 is not pressurized. The assembly allows the enclosure to breathe and keeps the
internal atmosphere free of harmful contaminants.
Depressurization 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.
Unlike the HRE-712 List 1 unit, the air-pressure cutoff valve in the HRE-712 List 2 unit
cannot be used to cut off an external air source that is applied to the Schrader air-stem
valve. The HRE-712 List 2 air-pressure cutoff valve can only control the air source that is
applied to the enclosure throughout the air-core stub.
