cedar, if treated as specified for western red cedar, and western fir, if
treated as specified for Douglas fir, may be used. Wood poles shall have
pole markings located approximately 3 m 10 feet from pole butts for poles
15.2 m 50 feet or less in length, and 4 m 14 feet from the pole butts for
poles longer than 16.8 m 55 feet in length. Poles shall be machine trimmed
by turning smooth full length, and shall be roofed, gained, and bored prior
to pressure treatment. Where poles are not provided with factory-cut
gains, metal gain plates shall be provided.
2.8.2
Steel Poles
Steel poles shall be designed to withstand the loads specified in IEEE C2
multiplied by the appropriate overload capacity factors, shall be hot-dip
galvanized in accordance with ASTM A 123/A 123M and shall not be painted.
Poles shall have tapered tubular members, either round in cross-section or
polygonal, and comply with strength calculations performed by a registered
professional engineer. Calculations shall be submitted in accordance with
the detail drawings portion of paragraph SUBMITTALS. Pole shafts shall be
one piece. Poles shall be welded construction with no bolts, rivets, or
other means of fastening except as specifically approved. Pole markings
shall be approximately 1 to 1.2 m 3 to 4 feet above grade and shall include
manufacturer, year of manufacture, top and bottom diameters, length, and a
loading tree. Attachment requirements shall be provided as indicated,
including grounding provisions. Climbing facilities are not required.
Bases shall be of the anchor-bolt-mounted type.
2.8.3
Concrete Poles
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NOTE: In areas where freezing temperatures occur,
the minimum compressive strength given for concrete
in spun poles should be increased in line with
concrete design for such temperatures.
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Concrete poles shall be designed to withstand the loads specified in IEEE C2
multiplied by the appropriate overload capacity factors. Poles shall be
reinforced or prestressed, either cast or spun. Spun poles shall be
manufactured by a centrifugal spinning process with concrete pumped into a
polished round tapered metal mold. Concrete for spun poles shall have a
compressive strength of at least 34.5 MPa 5000 psi at 28 days; steel wire
shall have an ultimate tensile strength of at least 827 MPa 120,000 psi;
and reinforcing bars shall have an ultimate tensile strength of at least
276 MPa 40,000 psi. After the high speed spinning action is completed, a
spun pole shall be cured by a suitable wet steam process. Spun poles shall
have a water absorption of not greater than three percent to eliminate
cracking and to prevent erosion. Concrete poles shall have hollow shafts.
Poles shall have a hard, smooth, nonporous surface that is resistant to
soil acids, road salts, and attacks of water and frost. Poles shall not be
installed for at least 15 days after manufacture. Fittings and brackets
that conform to the concrete pole design shall be provided. Poles shall
conform to strength calculations performed by a registered professional
engineer and submitted in accordance with detail drawings portion of
paragraph SUBMITTALS.
2.8.4
Pole Line Hardware
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NOTE: In hot humid marine atmospheres, galvanized
SECTION 16370A
Page 18
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