2.7
MANHOLES, HANDHOLES, AND PULLBOXES
**************************************************************************
NOTE: Actual strength figures may need to be
adjusted to accommodate various manufacturers of
glass reinforced polymer boxes.
**************************************************************************
Manholes, handholes, and pullboxes shall be as indicated. Strength of
manholes, handholes, and pullboxes and their frames and covers shall
conform to the requirements of IEEE C2. Precast-concrete manholes shall
have the required strength established by ASTM C 478, ASTM C 478M. Frames
and covers shall be made of gray cast iron and a machine-finished seat
shall be provided to ensure a matching joint between frame and cover. Cast
iron shall comply with ASTM A 48/A 48M, Class 30B, minimum. Handholes for
low voltage cables installed in parking lots, sidewalks, and turfed areas
shall be fabricated from an aggregate consisting of sand and with
continuous woven glass strands having an overall compressive strength of at
least [69] [_____] MPa [10,000] [_____] psi and a flexural strength of at
least [34.5] [_____] MPa [5,000] [_____] psi. Pullbox and handhole covers
in sidewalks, and turfed areas shall be of the same material as the box.
Concrete pullboxes shall consist of precast reinforced concrete boxes,
extensions, bases, and covers.
2.8
POLES AND HARDWARE
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NOTE: For new pole line construction, coordinate
with UFGS-16370A ELECTRICAL DISTRIBUTION SYSTEM,
AERIAL. Where the scope of the project is small,
such as installation of one or two poles, the
designer may elect to incorporate the pole and
hardware paragraphs from UFGS-16370A in this section.
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Poles and hardware shall be in accordance with Section 16370A ELECTRICAL
DISTRIBUTION SYSTEM, AERIAL.
2.9
TRANSFORMERS, SUBSTATIONS, AND SWITCHGEAR
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NOTE: Specify transformer phase sequence in
accordance with the local practice. Delete tap
setting requirement where transformers do not have
primary tap requirements. Provide tap settings in
accordance with load-flow and voltage drop study
results. Refer to TM 5-811-1/AF AFJMAN 32-1080 for
guidance.
**************************************************************************
Transformers, substations, and switchgear shall be of the outdoor type
having the ratings and arrangements indicated. Medium-voltage ratings of
cable terminations shall be [5] [15] [25] [28] [35] kV between phases for
133 percent insulation level.
2.9.1
Secondary Unit Substation
Secondary unit substations shall comply with ANSI C37.121 and shall be of
the [radial type] [radial type with an outgoing section mounted integrally
SECTION 16375A
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