Electric Distribution Design Basics
October 3-4
Three-Phase Electric Distribution Design October 4-5

Live Streaming Online

A Program

Click Here to register $2195 ($1195 each course)

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

Electric Distribution Design Basics

October 3-4, 2023 | Online :: Central Time

The EUCI Electric Distribution Design Basics course provides a fundamental understanding to safe and durable line construction requirements and techniques. The course begins with a review of basic electrical terminology and moves into an introduction of overhead line construction. All components are well defined. Special emphasis will be placed on single-phase line construction, single-phase service for residential and commercial utility customers. This course folds in applicable sections of the latest version National Electric Safety Code, effective February 2023.  

Learning Outcomes

  • Define basic electrical terms such as: Components of Ohm’s Law, the impedance triangle and power triangle
  • Review the basic concepts of overhead line design including: Conductor Spacing, Clearances, Structural Loading, Span Length, Line Tension and Guying
  • Review of line equipment necessary for line design: poles, pole peripheral equipment (cross arms, brackets, insulating equipment, conductor, transformers, and protective equipment)
  • Review thorough examination of Single-Phase Line Design as line extension of a three-phase trunk circuit.
  • Gain detailed instruction on the design of single-phase residential service including sizing of conductor and service transformer for multiple dwellings
  • Discuss an introduction to single-phase electric underground distribution including equipment such as cable, HV connecting components and service transformers



9:00 a.m. – 5:00 p.m. : CENTRAL TIME

Introductions and Welcome

Power Electrical Concepts and Terminology

  • Voltage, Current, Resistance/Impedance
  • Impedance and Power Triangles

Introduction to National Electric Safety Code 2023

  • Overhead Line Requirements – Part 2
  • Underground Line Requirements – Part 3

Overhead Line Design Fundamentals

  • Line Clearance and Spacing
  • Phase to Phase
  • Phase to Ground
  • Energized Line to Obstructions
  • Span Lengths and Line Tensions

Single-Phase Overhead Line Design

  • Conductor ampacity and strength
  • Pole Material Options
  • Guying

System Protection

  • Overcurrent Protective Devices
  • Fuse Cutouts
  • Reclosers
  • Transient Overvoltage Protective Devices
  • Surge Arresters


9:00 a.m. – 12:00 p.m. : CENTRAL TIME

Overhead Single-Phase Service Design

  • Sizing Single-Phase Distribution Transformers
  • Selection of Overhead Service Conductor
  • Meter Base Installation and Grounding
  • Residential Service with EV Charging

Introduction to Underground Design

  • Radial vs. Loop Underground Lines
  • Underground Cable
  • Dead Front Connecting System

Three-Phase Electric Distribution Design

October 4-5, 2023 | Online

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



1:00 – 5:00 p.m. : CENTRAL TIME

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


9:00 a.m. – 5:00 p.m. : CENTRAL TIME

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