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M
L D C A P A B I L I T I E S
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D
E S C R I P T I O N
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Span Definitions
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Defines a set of span lengths for use in sag tension and other
calculations
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Design Tension
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Defines conductor tension for the ruling span sagging tension method.
Compare to maximum allowed conductor tensions based on the project’s
standard’s body
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Sag & Uplift (Ruling Span)
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Estimates sag & tension using cantenary
equations and the ruling span. Based on an installation temperature of 60°F
with no consideration for thermal, elastic, or creep elongation
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Maximum Horizontal Span
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Calculates the maximum span length based on the horizontal separation
of conductors mounted on a given pole top crossarm
assembly
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Maximum Vertical Span
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Calculates the maximum span length based on the vertical separation
of the primary and neutral conductors
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Crossarm Strength
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Calculates approximate and permitted loads on a given crossarm assembly
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Pole Strength/Guy Load
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Calculates the maximum span length as well as guy line requirements
for specific conductor, pole, and assembly combinations
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Maximum Line Angle
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Calculates the maximum line angle at a pole based on conductor and
insulator loads
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Sag & Tension Table
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Calculates initial and final conductor sag and tension using the
Alcoa graphical method for ACSR conductors and publicly available
stress-strain-creep coefficient data
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Stringing Table
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Calculates conductor sag and tension for a given set of installation
temperatures and a given set of stringing span lengths, using the Alcoa
graphical method for ACSR conductors and publicly available
stress-strain-creep coefficient data
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Vertical Corner Guide
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Calculates 3-phase vertical corner (deadend
corner), pole and guy requirements
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Horizontal Tap Guide
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Calculates 3-phase Horizontal tap guide
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Buckarm Guide
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Calculates 3-phase buckarm (double deadends) guide
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RUS Line Construction Drawings
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User selectable RUS assembly and crossarms.
Size/length data is saved for use in related calculations. Construction
drawings can also be directly viewed. Capability for the user to add custom
assembly drawings and associated data too
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Report Generator
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Generates printable as well as PDF reports for specific calculation
sets or for the entire project
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Support for RUS Design
Bulletins
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1724E-150
– Unguyed Distribution Poles-Strength Requirements
1724E-151
– Mechanical Loading on Distribution Crossarms
1724E-152
– The Mechanics of Overhead Distribution Line Conductors
1724E-153
– Electric Distribution Line Guys and Anchors
1724E-154
– Distribution Conductor Clearances and Span Limitations
1728F-803
– Specifications and Drawings for 24.9/14.4 kV Line Construction
1728F-804
– Specifications and Drawings for 12.47/7.2 kV Line Construction
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IEEE National Electrical
Safety Code®
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(NESC®) ANSI C2-2007 with capability to change parameters for future
NESC Code updates
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U
S E C A S E E X A M P L E S
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D
E S C R I P T I O N
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RUS
1724E-153, Ex 14
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This case determines the necessary guy assemblies to support a
structure. It requires calculation of the total horizontal moment, Mg, of a unguyed distribution pole. It
then moves through the determining of the needed guy assembly, guy wire and
anchors to fully support the structure. This example is fully detailed in RUS
Bulletin 1724E-153 Section 14.
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RUS
Bulletin 1724E-151, Ex. 4.5
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This case determines the allowable loading on a crossarm (i.e. weight span) necessary guy assemblies
to support a structure. The calculation assumes the RUS standard size of
cross-arm (width = 3 ½ inches; depth = 4 ½ inches; diameter of mounting bolt
hole = 11/16 inches). This example is detailed in RUS Bulletin 1724E-151
Section 4.5.
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RUS
Bulletin 1724E-151, Ex. 4.6
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This is similar to the use case created for 1724E-151, Ex. 4.5. It changes
the conductor size and the NESC Construction Grade. Like the other case, it
assumes the RUS standard size of cross-arm (width = 3 ½ inches; depth = 4 ½
inches; diameter of mounting bolt hole = 11/16 inches). This example is
detailed in RUS Bulletin 1724E-151 Section 4.6.
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RUS
Bulletin 1724E-151, Ex 5.3
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This case determines the maximum allowed unbalanced longitudinal
loads on the cross-arm assembly for a dead-end. The calculation assumes the
RUS standard size of cross-arm (width = 3 ½ inches; depth = 4 ½ inches;
diameter of mounting bolt hole = 11/16 inches). This example is detailed in
RUS Bulletin 1724E-151 Section 5.3.
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RUS
Bulletin 1724E-151, Ex 5.1.1
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This case determines the maximum (permitted sum) of applied
longitudinal load moments on a cross-arm assembly. The calculation assumes
the RUS standard size of cross-arm (width = 3 ½ inches; depth = 4 ½ inches;
diameter of mounting bolt hole = 11/16 inches). This example is detailed in
RUS Bulletin 1724E-151 Section 5.1.1.
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RUS
Bulletin 1724E-150, Ex 4.4
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This case determines the total horizontal moment, Mg, of a unguyed distribution pole . The
use case has been made to provide the same values as the example. This meant using
lesser values for the conductor and neutral tension than what is recommended.
It is up to the User to determine the correct values of conductor and neutral
tension to apply. This example is detailed in RUS Bulletin 1724E-150 Section
4.4
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RUS
Bulletin 1724E-154, Ex 3.4
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This case determines the maximum allowable span based on horizontal
clearances of conductors based. This is based on the RUS phase-to-phase
horizontal conductor separation of 44 inches and conductor clearances of 43
inches. This example is detailed in RUS Bulletin 1724E-154 Section 3.4
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RUS
Bulletin 1728F-804, Exhibit 1
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This case determines the maximum line angle for the primary
conductors and neutral conductors based on the type of pin/post and spool
insulator assemblies. This example is detailed in RUS Bulletin 1728F-804
Section 3.4.
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3-ph
Vertical Corner
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This case determines the total horizontal moment, Mg, of a unguyed distribution pole. This
is a special defined case as the calculation differs from the 1724E-150, Ex
4.4 use case. This use case utilizes the construction standard C4.1G which is
a three-phase vertical corner.
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3-ph
Horizontal Tap
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This case determines the total horizontal moment, Mg, of a unguyed distribution pole.
This is a special defined case as the calculation differs from the 1724E-150,
Ex 4.4 use case. This use case utilizes the construction standard C5.82G
which is a three-phase tangent with a three-phase tap.
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3-ph
Buckarm
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This case determines the total horizontal moment, Mg, of a unguyed distribution pole.
This is a special defined case as the calculation differs from the 1724E-150,
Ex 4.4 use case. This use case utilizes the construction standard C6.91G
which is a three-phase buck arm.
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