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Overview
F
D
UNCTIONAL
ESCRIPTION
The following section discusses the function of each component on the HRE-506. The HRE-506 consists of an
aluminum card cage with a holding capacity for up to six remote or doubler units, a stainless steel composite
baseplate, and a stainless steel cover that maintains weather-tight integrity.
Gel-Filled Unit
The gel-filled HRE-506 List 1 unit is equipped with three metal valves installed in the base section, as shown in
Figure 3 on page
5. The gel-filled screened 28-pair, 24 American Wire Gauge (AWG) cable stub on the gel-filled
unit is equivalent to an ALP FTS-PIC filled-core telephone cable. The unit has foam skin insulation with a
single-filed jacket. This insulation allows the cable stub on the gel-filled unit to be used in buried, aerial, and duct
applications.
Standard color codes are used for pair identification with color compounds chosen for electrical balance and
permanency. The outer jacket provides a flexible protective covering that withstands exposure to sunlight,
atmospheric temperatures, ground chemicals, and stresses expected in standard installations. The outside diameter
of the cable is 0.64 inches (16.25 mm).
The cable complies with the requirements of the American Standards Institute (ANSI)
and the Insulated Cable Engineers Association (ICEA) S-84-608-1994 and REA PE-89,
respectively.
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. Circulating outside air through the gel-filled enclosure prevents the buildup
of excessive moisture and other damaging contaminants within the enclosure.
A combined Schrader air stem and external air input T-valve is also included with the gel-filled units. The
Schrader air stem valve can be used to connect to an external air source or release the internal pressure whenever
the dome is removed. Opposite the Schrader valve, the external air input valve accepts tubing for connection to
an external air source. The pressure cutoff valve allows the external source of air to be cutoff, when the dome is
opened.
An optional 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 tab on 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. For installation details, see
List 1 Vented to Pressurized Conversion Procedure" on page
4
29.
March 28, 2000
150-506-100-03
"HRE-506
HRE-506 List 1 and List 2
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