Utility Design Criteria for

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Utility Design Criteria for
Highway Relocation Projects
Florida Utilities Coordinating Committee
Educational Workshop Nov. 5th, 2003
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Overhead Electric Distribution Facilities
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Design Criteria

• What are the requirements of the utility to
  design a relocation project ?
• What are some of the problems associated with
  utility design ?
• What are the steps in designing a utility
  relocation ?
• What factors effect the utility relocation design
  time ?
• What is required for the final design to be
  completed ?

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What are the requirements of the utility to
design a relocation project ?

• Limits of any right-of-way acquisitions
• Proposed roadway geometry
• Existing as well as future site conditions
• All major elements of the construction
• Bridges or overpasses
• Drainage structures
• MSE or Noise walls
• Signal poles
• Roadway lighting poles
• Overhead signs

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What are some of the problems associated with
utility design ?

• Design a relocation that meets all the standard
  construction practices of that utility
• Design a relocation that minimizes the impact to
  the right-of-way (uses as little r/w as possible)
• Design a facility that can be maintained during
  the roadway construction activities
• Design for obstructions adjacent to the
  right-of-way
• Design a facility that meets all NESC clearance
  and safety requirements
• Design so that the utility and the roadway can be
  constructed within the OSHA code requirements

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What are the steps in designing a utility
relocation ?

• Determine future load growth requirements
• Access possible alternate routes or realignment
  within the existing right-of-way
• Determine requirements of existing or proposed
  joint pole users
• Determine all permitting requirements associated
  with the possible design alternatives
• Evaluate the the cost to benefit ratios of the
  possible design alternatives
• Evaluate future maintenance requirements of the
  possible design alternatives

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What factors effect the utility relocation design
time ?

• The complexity of the roadway improvement project
• The number and size of the utilities sharing the
  right-of-way
• The permitting requirements of the utility
  relocation design
• Changes in roadway design after the utility
  design process has begun
• Addition or change in drainage, lighting,
  signalization or signing plans

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What is required for the final design to be
completed ?

• Final roadway plans including all structure and
  drainage plan sheets
• Final signalization, signing and lighting plans
• All right-of-way acquisition that effects the
  utility relocation completed
• Final approval for the utility construction from
  all required permitting agencies
• Proposed alignments of all other utilities within
  the right-of-way
• Final MOT and construction phasing plans
• Final requirements of all joint pole users

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Proposed cantilever sign structure
Existing 12,470 volt overhead primary
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Closest energized conductor of overhead line
OSHA required clearance for sign construction and
maintenance 10 0 - 50,000 volts
NESC minimum clearance 6 0 - 750
volts 8 750 - 22,000 volts
Proposed Cantilever sign
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Existing overhead 12,470 volt lines To be
removed To remain
Proposed
Existing traffic signal span wires attached to
power poles
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Proposed Mast arm traffic signals
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Existing proposed 12,470 volt lines signal
span wires with proposed mast arm traffic signals
Design Change Increase pole height on proposed
line to provide NESC and OSHA clearances Old
poles to remain until removal of signal span wires
Result Maximum clear working height for drill
shaft and signal pole installation 30 Or
contractor and his equipment certified for work
on high voltage
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Proposed highway lighting poles
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Existing proposed 12,470 volt lines signal
span wires with proposed mast arm traffic signal
poles proposed highway lighting poles
No change in proposed design required
Contractor and equipment must maintain 10
clearance from 12,470 volt lines during light
pole installation or be certified for high
voltage work
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Existing Intersection Looking North
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Existing Intersection Looking West
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Existing 12,470 volt overhead double circuit
primary line located at R/W line to remain in
place
Two existing 230kv transmission steel tower lines
to remain in place
Proposed bridge structure over Cross Bayou Canal
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Vertical clearances also required from 230kv
transmission lines
12,470 volt line
12,470 volt line
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Clearance required from 12,470 volt line for
bridge structure construction equipment
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Distance from face of pole to face of structure
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Existing Cross Bayou Canal, South Side of R/W
Looking West
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Existing Transmission Crossing R/W at Cross Bayou
Canal, Looking NW
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Temporary Overhead Lines to Clear Bridge
Construction Phase I MOT
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Proper clearance from existing E/W 12,470 volt
line to allow construction of signal pole
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Proper vertical clearance from 120 N/S 120 volt
line for signal pole maintenance
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Improper horizontal clearance from N/S 12, 470
volt line for signal pole installation
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Multi-story structures adjacent to R/W
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Existing billboard adjacent to R/W
Relocated 12,470 volt primary line
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Bonded grounded conductors
Underground dip to provide NESC OSHA clearances
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Improper clearance for sign maintenance
Sign meats all horizontal requirements as it is
but can not be maintained on the N/W face of the
sign due to 12,470 volt lines
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12,470 volt line
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Does this meet code ?
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Yes
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Relocated pole line
R/W
Trees at or near the right-of-way line
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Additional Facilities Required Due to Offset in
R/W Line
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Questions ?