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Public utilities

Engineering Specifications for Overhead Transmission Line Segment

Strategic Insights

— 1 min read

The Iowa Public Utilities Commission has issued the document detailing the engineering specifications for an overhead transmission line segment in Des Moines. The line segment, owned by Corn Belt Power Cooperative, stretches for 0.74 miles and spans across sections 19 and 24 in townships 91N and ranges 37W and 38W. The segment was constructed in 1999 and will be maintained in accordance with the Iowa Electrical Safety Code and the 1997 Edition of the National Electrical Safety Code. The transmission line operates at a maximum capable voltage of 72.5 kVAC and a nominal operating voltage of 69 kVAC.

Key Takeaways:

  • The line segment is owned by Corn Belt Power Cooperative and spans 0.74 miles.
  • The segment was constructed in 1999 and will be maintained in accordance with the Iowa Electrical Safety Code and the 1997 Edition of the National Electrical Safety Code.
  • The transmission line operates at a maximum capable voltage of 72.5 kVAC and a nominal operating voltage of 69 kVAC.
  • The segment uses ACSR Shield Wire with a size of 336.4 kmil, a stranding of 26/7, and a material of ACSR.
  • The typical structures used are wood poles with a height of 47.5 - 52 ft. after installation.
  • The steel structures used are H-Frame with a spacing of N/A ft. between poles.
  • The MidAmerican Energy Company owns the second transmission circuit, which is the MidAmerican Energy Company Buena Vista Double Circuit.
  • The second transmission circuit operates at a maximum capable voltage of 72.5 kVAC and a nominal operating voltage of 69 kVAC.

Statistics:

  • 0.74 miles is the length of the segment.
  • 1999 is the year the segment was constructed.
  • 72.5 kVAC is the maximum capable operating voltage.
  • 69 kVAC is the nominal operating voltage.
  • 336.4 kmil is the size of the ACSR Shield Wire.
  • 26/7 is the stranding of the ACSR Shield Wire.
  • 47.5 - 52 ft. is the typical height of the wood poles after installation.
  • N/A ft. is the spacing between H-Frame poles.

Sources:

  • 1.2024 EXHIBIT C Engineering Specifications for an Overhead Transmission Line Segment
  • Filed with the Iowa Utilities Commission on May 12, 2025, E-21496

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