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Overview
F
D
UNCTIONAL
ESCRIPTION
The following section discusses the function of each component on the HRE-504. The enclosure consists of an
aluminum card cage with a holding capacity for up to four doubler units, a stainless steel composite baseplate, and
a stainless steel cover that maintains weathertight integrity.
Gel-filled Stub Unit
The gel-filled HRE-504 List 1 and List 1B stub units are equipped with three metal valves installed in the base
section, as shown in
Figure
gel-filled units are equivalent to an ALP FTS-PIC filled-core telephone cable. The unit has foam skin insulation
with a single-filled jacket. This insulation allows the cable stub on the gel-filled unit to be used in buried, aerial,
and duct applications.
The gel-filled HRE-504 List 1 and List 1B are identical, except for the cable stub. The cable stub
for the HRE-504 List 1 is 30 ft (9.14 m) and for the HRE-504 List 1B is 100 ft (30.48 m).
Standard color codes are used for pair identification with color compounds chosen for electrical balance and
permanency. The outer jacket consists of material that provides protective covering from sunlight, atmospheric
temperatures, ground chemicals, and stresses expected in standard installations.
The cable complies with the requirements of the American National Standards Institute (ANSI)
and the Insulated Cable Engineers Association (ICEA) S-84-608-1994 and REA PE-89.
The gel-filled unit is similar to the air-filled unit, except that the gel-filled unit has a breather vent valve instead
of a pressure relief valve. The breather vent valve allows the circulation of outside air through the gel-filled
enclosure when it is not pressurized. The enclosure must breathe to prevent excess moisture and other damaging
contaminants from accumulating within the enclosure.
A combined Schrader air stem and external air intake T-valve is also indicated with the gel-filled unit. The
Schrader air stem valve can be used to connect to an external air source or release the internal pressure whenever
the dome is to be removed. Adjacent to the Schrader valve, the external air intake valve accepts tubing for
connection to an external air source. The pressure cutoff valve allows the external source of air to be cut off, when
the valve is closed.
An optional external pressure relief valve is included in the shipping kit for the gel-filled unit. The kit comes in a
small plastic bag that is attached to the shrink tabs of one of the spare pairs. Use the pressure relief valve in place
of the breather vent assembly when the gel-filled unit is to be locally pressurized.
4
3. The gel-filled screened 28-pair, 24 American Wire Gauge (AWG) cable stub on the
August 1, 2002
150-504-100-03
HRE-504 List 1, List 1B, and List 2
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