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Siloam Springs 69kV Transmission Line

Transmission lines provides standby capacity required for long-range planning.

Garver designed a new 4.6-mile 69kV transmission line along the City of Siloam Springs' north and east boundaries. This new line adds electrical capacity for a 20-year projected city growth. Garver's design incorporated several owner-requested enhancements, including galvanized steel poles - using National Electrical Safety Code (NESC) heavy design to protect against heavy icing conditions - and high temperature aluminum conductor steel supported (ACSS) transmission lines to provide standby capacity required for long-range planning.

Garver developed criteria, together with the city, for the route selection and then performed a decision analysis based upon the criteria. The line starts near the Oklahoma/Arkansas state line at an interconnection point with Siloam Spring's power provider, Grand River Dam Authority. The line runs approximately 2.8 miles east to the location of a new proposed substation site and then turns south 1.8 miles to tie into an existing 69kV transmission line, thus completing a 69kV loop around the city.

Garver supported the city through environmental assessment and permitting. Garver provided the topographical, profile, and property surveys along with property acquisition documents for the owner. The transmission line has capacity for one medium voltage under-build over most of its length.

Garver used PLS-CADD software for this design. Garver provided pole top designs and dying guides as well as material lists. Garver developed project cost estimates and assisted the city with material bidding and procurement documents. By working closely with the city, Garver provided a design that meets the special needs and desires of its client.

 
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