including grounding provisions. Climbing facilities are not required.
Bases shall be of the anchor-bolt-mounted type.
2.2.3
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 design data portion of paragraph
entitled "SUBMITTALS." Provide certification, from the manufacturer, that
the technical requirements of this specification shall be met.
2.3
CROSSARMS
2.3.1
Wood Crossarms
Conform to RUS 1728H-701. Pressure treat crossarms with pentachlorophenol,
chromated copper arsenate (CCA), or ammoniacal copper arsenate (ACA).
Treatment shall conform to AWPA C25. Crossarms shall be solid wood,
distribution type, and a 6.4 mm 1/4 inch 45 degree chamfer on all top
edges. Cross-sectional area minimum dimensions shall be 108.0 mm 4-1/4
inches in height by 82.6 mm 3-1/4 inches in depth in accordance with IEEE C2
for Grade B construction. Crossarms shall be 2.4 m 8 feet in length,
except that 3.1 m 10 foot crossarms shall be used for crossarm-mounted
banked single-phase transformers or elsewhere as indicated. Crossarms
shall be machined, chamfered, trimmed, and bored for stud and bolt holes
before pressure treatment. Factory drilling shall be provided for pole and
brace mounting, for four pin or four vertical line-post insulators, and for
four suspension insulators, except where otherwise indicated or required.
Drilling shall provide required climbing space and wire clearances.
Crossarms shall be straight and free of twists to within 2.5 mm per 304.8 mm
1/10 inch per foot of length. Bend or twist shall be in one direction
only.
2.3.2
Crossarm Braces
Provide [flat steel] [or] [steel angle] as indicated. Provide braces with
[965 mm span with 2440 mm crossarms] [and] [1520 mm span with 3050 mm
SECTION 16301N
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