Three-Phase Electric Distribution Design

Three-Phase Electric Distribution Design

May 8-9, 2024 | Online :: Central Time

Three-Phase Electric Distribution Design covers many in-depth topics in the ten plus hours of class work. After a review of basic electrical load definitions, the course moves quickly into load estimation for both an individual service as well as collective loads in greenfield areas.

The emphasis is on three-phase overhead construction and builds on attendees’ experience/knowledge with single-phase line extensions and service drops.  The course material covers a variety of three-phase framing options including cross arm, alley arm and vertical design. Attendees offer comments as to the preferred style and discuss advantages/disadvantages. This leads to options for multiple circuit design including spacer cable construction.

The Electric Underground Distribution modules expose attendees to a variety of transformer/pedestal design options for residential subdivisions. The three-phase commercial underground service design discussion provides an orientation to dead front padmount transformers and padmount transformer loops.  

Learning Outcomes

  • Define electrical load terms
  • Discuss load estimation tools including diversity theory and rules of thumb (VA/sq ft) for a variety of commercial and institutional loads
  • Review overhead line design basics regarding span length, line tension and clearances between phases and line obstructions
  • Discuss material options for overhead line construction components
  • Explore variations of three-phase overhead line construction framing


Wednesday, May 8, 2023 : Central Time

12:45 – 1:00 p.m.
Log In

1:00 – 5:00 p.m.
Course Timing


Introductions and Welcome

Introduction to Advanced Electric Distribution Design

    1. Load Definitions and Calculations
    2. Diversity of Load
    3. Load Estimates per Customer Category

Three-Phase Overhead Design with 2023 NESC

    1. Ruling Span Calculation
    2. Line Design Example
    3. Pole Strength Requirements
    4. Grades of Construction


    Thursday, May 9, 2024 : Central Time

    8:45 – 9:00 a.m.
    Log In and Welcome

    12:00 – 12:45 p.m.
    Lunch Break

    9:00 a.m. – 5:00 p.m.
    Course Timing


    Overhead Line Construction Components and Material Options

    • Pole Material Selection
      • Laminated Wood
      • Ductile Iron
        • Fiberglass
      • Spun Concrete

        Pole Framing Design Options

        • Cross Arm
        • Alley Arm
        • Vertical
        • Spacer Cable
        • Multiple Circuit Overhead Construction

        System Protection and Power Quality Equipment

        • Overcurrent Protective Devices
          • Fuse Cutouts
          • Reclosers (Single- and Three-Phase)
        • Overvoltage Protective Devices
          • Surge Arresters
        • Power Quality Equipment
          • Power Capacitors
          • Three-Phase Overhead Service Automatics Step Voltage Regulators

        Three-Phase Overhead Service

        • Banking Single-Phase Transformers
        • Transformer Configurations

        Underground Distribution Design

        • Residential Subdivision
        • Overhead to Three-Phase Underground Service
          • Radial vs. Loop

        Right of Ways and Easements

        • ROW Purpose and Definition
        • ROW Issues
        • Easements


        Gary Roberts is a Professional Engineer with over 40 years’ experience in the Electric Utility industry, 25 years plus with TXU, worked on international engagements and currently with DRG Technical Solutions.  Gary is a graduate of the University of Texas at Arlington with a BSEE and a graduate of Southern Methodist University with an MBA.

        Jerry Josken holds a BS in Electrical Engineering Technology from the Milwaukee School of Engineering and an MBA from North Central College. During his 30+ year career with Eaton Power Systems, Jerry served in a variety of engineering capacities. Past leadership positions include Chair of IEEE Rural Electric Power Conference (2012) and GLEMS Distribution Equipment/Controls (2013-2014). Currently, Jerry develops and conducts professional development programs on various power delivery topics for EUCI.

        Online Delivery

        We will be using Microsoft Teams to facilitate your participation in the upcoming event. You do not need to have an existing Teams account in order to participate in the broadcast – the course will play in your browser and you will have the option of using a microphone to speak with the room and ask questions, or type any questions in via the chat window and our on-site representative will relay your question to the instructor.

        • Microsoft recommends downloading and installing the Teams app if possible. You may also use the Edge browser or Chrome.
        • You will receive a separate email with a unique link to a personalized landing page which will include links to join all sessions of this event.
        • If you are using a microphone, please ensure that it is muted until such time as you need to ask a question.
        • The remote meeting connection will be open approximately 30 minutes before the start of the course. We encourage you to connect as early as possible in case you experience any unforeseen problems.


        Please Note: This event is being conducted entirely online. All attendees will connect and attend from their computer, one connection per purchase. For details please see our FAQ

        If you are unable to attend at the scheduled date and time, we make recordings available to all attendees for 7 days after the event


        Three-Phase Electric Distribution Design

        May 8-9, 2024 | Online
        Individual attendee(s) - $ 1195.00 each

        Volume pricing also available

        Individual attendee tickets can be mixed with ticket packs for complete flexibility

        Pack of 5 attendees - $ 4,780.00 (20% discount)
        Pack of 10 attendees - $ 8,365.00 (30% discount)
        Pack of 20 attendees - $ 14,340.00 (40% discount)

        This event is related and may be of interest.

        Electric Distribution Design Basics

        May 7-8, 2024 | Online
        Individual attendee(s) - $ 1195.00 each

        Volume pricing also available

        Individual attendee tickets can be mixed with ticket packs for complete flexibility

        Pack of 5 attendees - $ 4,780.00 (20% discount)
        Pack of 10 attendees - $ 8,365.00 (30% discount)
        Pack of 20 attendees - $ 14,340.00 (40% discount)

        Your registration may be transferred to a member of your organization up to 24 hours in advance of the event. Cancellations must be received on or before April 05, 2024 in order to be refunded and will be subject to a US $195.00 processing fee per registrant. No refunds will be made after this date. Cancellations received after this date will create a credit of the tuition (less processing fee) good toward any other EUCI event. This credit will be good for six months from the cancellation date. In the event of non-attendance, all registration fees will be forfeited. In case of conference cancellation, EUCIs liability is limited to refund of the event registration fee only. For more information regarding administrative policies, such as complaints and refunds, please contact our offices at 303-770-8800




        EUCI is accredited by the International Accreditors for Continuing Education and Training (IACET) and offers IACET CEUs for its learning events that comply with the ANSI/IACET Continuing Education and Training Standard. IACET is recognized internationally as a standard development organization and accrediting body that promotes quality of continuing education and training.

        EUCI is authorized by IACET to offer 1.0 CEUs for this event

        Requirements for Successful Completion of Program

        Participants must log in each day, be in attendance for the entirety of the course.  In addition, attendees are required to participate in Question/Answer Sessions, discussion and share personal experience relevant to the course material.

        Instructional Methods

        Power Point presentations will include video, charts, graphs and illustration. Attendees are encouraged to participate in open discussion and question throughout the course duration.

        Upon successful completion of this event, program participants interested in receiving CPE credits will receive a certificate of completion.

        Course CPE Credits: 12.0
        There is no prerequisite for this Course.
        Program field of study: Specialized Knowledge
        Program Level: Basic
        Delivery Method: Group Internet Based
        Advanced Preparation: None

        CpeEUCI is registered with the National Association of State Boards of Accountancy (NASBA) as a sponsor of continuing professional education on the National Registry of CPE Sponsors. State boards of accountancy have final authority on the acceptance of individual courses for CPE credit. Complaints regarding registered sponsors may be submitted to the National Registry of CPE Sponsors through its web site:


        Who Should Attend

        • Distribution Line Designer with some design experience
          • Electrical Utility
          • Electrical Construction Firms
        • Managers responsible for the supervision of Line Design Personnel
        • Line Construction Foreman
        • Procurement Specialist responsible for the purchase of line equipment
        • Anyone who needs an understanding of three-phase line design

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