Electrical Design for Motors


Instructor: Ken Lovorn, P.E.

Subjects: Other Technology: Motors and Drives

Length: 3 weeks

Student Rating

Rating: 7.4/10 (view ratings)
93 students have taken this course , 220 students are interested


Learn all of the skills necessary to design branch circuits for motors. This course covers single and three phase induction motors, elevator motors, fire pumps, and refrigeration motors. Not only will you learn over current and short circuit protection, you will also learn the National Electrical Code (NEC) criteria for sizing conduit and wire for these motors. Learn little known design tips to reduce installation costs, while still staying within all the NEC criteria for the design of these branch circuits.

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Self Paced Online Course

You can begin this online course instantly upon enrollment. Get access to all of the course materials as soon as you enroll. The instructor-led session will begin on the scheduled start date. During the session dates the instructor will be in the course answering questions on the discussion board and reviewing project work.

Access Information And Build Your Training Library

After enrolling, the course materials will remain in your account and be accessible 12 months (1 year) after enrollment. Access can be extended beyond 1 year with a monthly membership. Rewatch videos and review assignments as many times as you want. Return to your course anytime with online access from anywhere in the world.

Earn A Certificate Of Completion

When you complete this course you are eligible for a certificate of completion from HeatSpring. You can download your certificate as soon as you have completed all of the course requirements. Students can easily share their verified certificates on their LinkedIn profiles using our one-click LinkedIn integration.

Earn Continuing Education Credits

Self Report with Certificate: 4 AIA LU Credits

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Lovorn kenneth.jpg?ixlib=rb 1.1

Ken Lovorn, P.E.

President, Lovorn Engineering Associates

Ken has forty-five years of progressive design and engineering management experience with architect-engineers and consulting engineers designing electrical systems. As President of Lovorn Engineering Associates (LEA), Ken emphasizes the thorough evaluation of alternative design approaches and how to achieve equivalent compliance with the applicable Codes and...[more]

Course Outline

Welcome - Orientation Materials

This course is self-paced, so you don’t need to be logged in at any specific time. You can complete the material whenever is convenient and work ahead or catch up if you fall behind. The course discussion board is a great place to interact with other students and ask questions. Expect to dedicate a minimum of 5 hours per week to the course. This session runs for the posted dates and you will receive weekly emails to keep you on pace. Course materials will remain in your account with minimum guaranteed access for 12 months (1 year) after the course ends. Please review the orientation materials and introduce yourself on the discussion board.

  • Introduction to HeatSpring (1 minute) (Video) preview
  • Set up email notifications and your student profile (Text)
  • Note on Content from the NFPA 70®-2014, National Electrical Code® (Text)
  • Optional - Basic Electrical Single Line Calculations Course (Resource)
  • Introduce yourself on the discussion board (Text)
Week 1 - Basic Design and Code Criteria

Basic design criteria for overcurrent protection of single and three phase motors will be explored and the specific Code criteria will be discussed. These concepts will be expanded to include multiple motor installations for both groups of single and three phase motors.

  • Fractional Single Phase and Integral Three Phase Induction Motors (15 minutes) (Video)
  • Presentation Slides (Download .pdf)
  • Overload Relays and Thermal Unit Selection - Square D (Resource)
  • Session 1 Homework (Text)
Week 2 - Techniques for Sizing

The overcurrent design criteria developed in Session 1 will be expanded to include normal and emergency power circuit protection for Fire Pumps. We will also look at the most economical techniques for sizing the wiring and conduit for motor branch circuits. While these techniques are in fully compliance with the NEC, they are seldom utilized in the construction industry and can save you considerable construction dollars and still provide a safe, Code compliant installation.

  • Fire Pump Motors and Design of Equipment Grounding Conductors (23 minutes) (Video)
  • Presentation Slides (Download .pdf)
  • Session 2 Homework (Text)
Week 3 - Complete Electrical Installation

The basic overcurrent design criteria will be further expanded to include elevator and refrigeration motors and the ancillary equipment required for a complete electrical installation of these systems.

  • Elevator Motors and Refrigeration Equipment - Design of Breakers, Fuses, and Brand Circuit Conductors for Motor Applications (22 minutes) (Video)
  • Presentation Slides (Download .pdf)
  • Session 3 Homework (Text)
  • Final Exam (Quiz)
After The Course - Feedback and Additional Resources

No matter how great this course is, we know it's just one part of a bigger journey. In this module we'll start thinking about what comes next. You'll provide feedback on the course, request a certificate of completion, and learn about additional resources. Don't forget that you'll have access to the course materials will remain in your account with minimum guaranteed access for 12 months (1 year). Feel free to come back as much as you like to continue learning, and please stay in touch. Let us know what you do next and how we can help.

  • Self-Check: Session 1 Homework Solutions (Download .pdf)
  • Self-Check: Session 2 Homework Solutions (Download .pdf)
  • Self-Check: Session 3 Homework Solutions (Download .pdf)
  • 1 Year of Access to Course Materials (Text)
  • Feedback: 2-minute Exit Survey (Survey)
  • Consider Joining as a Founding Member (Resource)
  • Certificate of Completion: Request a Certificate (Certificate)

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